Kenwood TH-77 Extended frequency coverage and dual-band repeater ------------------------------ relayed by n2ixl, from bitnet infohams digest,v90n433 Kenwood has made this radio compatible with the new ICOM S-Series radios from what I can tell. It has DTSS (Dual Tone Squelch System) which means that your radio will not break squelch until it hears a particular sequence of three DTMF tones (ICOM has this also and they call it Coded Squelch which also use three tones). The TH77A also has a paging function that works *exactly* like the ICOM paging. You program the radio with a personal 3 digit DTMF code and someone pages you by transmitting YOUR 3 digit code, followed by a * character and then their own 3 digit code. The ICOM will start to ring to let you know that you have been paged and display the 3 digit code of the person that has paged you. The TH77A will beep once and open squelch as long as the person that paged you does not drop carrier (I prefer the ICOM method for this part, but there is a work around that I will mention in a bit). One thing the TH77A does at this point is bring up a timer so you know how long its been since you've been paged. Maximum time is 99 hours and 99 minutes. Let's see if your battery can hold out that long! The workaround so the TH77A will ring, rather than just beep and open squelch is to put the radio in the pager mode AND also put it in Tone Alert. When you get paged... the radio will "beep beep (pause) beep beep" five times and start up the timer. Kenwood has provided two different types of BEEPS for you. The second type is to ring like an electronic telephone. This one *REALLY* sounds nice!! For those of you that like autodial memories, there are 10 memories that can store 15 characters each. There are 40 regular frequency memories in this radio and you can make them all UHF if you like (no restriction). NOW! On to the *EXTRA* capabilities (there are other BASIC functions that I didn't mention, those were just the highlights). After making a few modifications to this radio, you can get it to do the regular stuff that the IC24AT will do, such as AM aircraft, expanded UHF (400-512 depending on PLL lock) and 800-950 (again, depending on PLL lock) in addition to cross band repeat. HOW DO YOU DO THIS!? -- -- -- || || || / \ / \ / \ =========================- | | | \-\ | | | /=====----\ | | | | | | | | | | | | | | | | | | \=====----/ | | | | -- -- -- | | || || <================== REMOVE THE RIGHT ONE | -- -- -- | FOR AM/800-950 RX. | -- | REMOVE BOTH TO ALSO | || -- -- -- -/ GET EXTENDED TX. | -- || || || / | -- -- -- | | | | /==========--\ | | | | | | | | | | | | | | | | | | | | | | \==========--/ | | | | | =========================- Layout shown with electrolytic capacitor C124 removed The best way to do this is to heat up both sides of the resistor and push it out of the way with something small. At least this was the best way for me! Once it's out, put the capacitor back in place and close it up. (Put the green wire back also, if you are making the out of band TX mod too!) ллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллл Msg Nr. : 38586 Da : IW7CMN Per : KENWOO@ITA Tipo/status : BF Data/ora : 0907/1227 Dimensione : 4516 Titolo : TH-77 E RICEZIONE AM E 900 MHZ Bid (Mid) : 9_IW7CMN IW7CMN/TPK 1.81 Msg #:9 Data:01-09-93 Ora:16:42Z Ho letto tempo fa un messaggio nel quale si chiedevano info a proposito del funzionamento del KENWOOD TH-77E sulle frequenze aeronautiche e sui 900 MHZ. Riporto quindi di seguito la procedura anche per rivalutare questo portatile dopo tutto non tanto "vecchio". La modifica consiste nel rimuovere i jumper R128 e R129. Apri il portatile estraendo le 3 viti sul retro e le altre 4 che sono sotto l'attacco del pacco-batteria.Aprire la carcassa in due parti. L'area su cui bisogna lavorare e' la scheda di controllo fissata nella sezione frontale della radio. Cercare in particolare il condensatore elettrolitico giallo che e' al centro del circuito (ci sono due integrati, uno al di sopra ed uno sotto) E' necessario rimuovere questo condensatore (C124) e metterlo da parte per un po'.....successivamente andra' rimesso a posto. Orientate il portatile in modo che le manopole del volume ed il connetto_ re d'antenna a BNC siano nella posizione delle ore 12 (lontano da voi) ed il fondo,dove si collega il pacco-batterie, sia nella posizione delle ore 6 (vicino a voi). -- -- -- || || || / \ / \ / \ ======================== ! ! ! ----------- ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ----------- ! ! ! ! ! ! -- -- -- ! ! || || r128-r129 ! -- -- -- ! ! -- ! ! || -- -- -- ! ! -- || || || ! ! -- -- -- ! ! ! ! --------- ! ! ! ! ! ! ! ! ! ! ! ! ! ! --------- ! ======================== Nell'area in cui avete rimosso il condensatore vedrete uno spazio vuoto in cui potrebbe andare un Jumper ed altri due Jumper situati uno accanto all'altro. Poco piu' sotto ci sono altri tre Jumpers uno accanto all'altro. Rimuovendo entrambi i Jumper, che poi sono R128 ed R129 e connettendo un filo (nel caso non ci sia) dalla posizione W5 ad un polo del condensatore si dovrebbe ottenere il seguente apliamento: 136-174 rx-tx 400-512 rx-tx 118-136 AM RX 800-950 RX. Dopo queste operazioni,se la modifica e' riuscita, perche' ripeto su alcune serie non funziona , tutta la vostra configurazione e le memorie verranno perdute. RICEZIONE AM Per ricevere le frequenze aeronautiche seleziona le VHf come main band e premi il tasto F due volte per andare al VFO. Una volta nel VFO premi il tasto UxU due volte. Una volta per il doppio ascolto in UHF e la seconda per ricevere l'AM(118-136). RICEZIONE 800-950 Selezionare le UHF come main band e premi il tasto F due volte per selezionare il VFO. Una volta nel VFO premere il tasto UxU due volte. NOTE La funzione ACCENSIONE+tasto 8 ,che permette di richiamare le memorie, funzionera',secondo N5KNX, diversamente. Nella parte destra del display avrai le voci E1 ed E2 che possono essere selezionate con la manopola del controllo VFO. Il modo E1 dovrebbe permetterti di selezionare l'ascolto dell'AM o dei 900 MHZ mentre ti sposti fra le memorie. Il modo E2,invece, dovrebbe saltare molte delle "memorie speciali" e l'unica maniera per recuperarle e' di selezionare manualmente l'AM o od i 900 e richiamare le memorie. 73 e buone vacanze da Sabino IW7CMN @ IK7NXQ.#BA.ITA.EU QTH:BARLETTA (BA) JN81DH ======================================================================== TH-77 I don't know about TH-77A which I think is an export version of TH-77, but I can give some information on TH-77, which I own. This set originally can TX/RX on 144-146MHz, and 430-440MHz. By cutting a green line about an inch long connecting between a capacitor and pin 4 of CPU(HD404608H) enables receiving on 118-174MHz, 335-512MHz, and 800-950MHz. There is another modification which let you transmit on wider range of 136-174MHz, and 400MHz-460MHz. This can be done by connecting pin 7 and 14 of HD404608H with 33Kohm register. The last modification is to connect pin 6 and pin 14 with 33Kohm register, which enables transmission on 350-460MHz, but disables receiving 118-174MHz and 800-950MHz instead. As an additional information, there is an interesting feature which let the transceiver to be a cross band repeater. This can be done by pressing UP arrow key when you turn the power on. To release this mode, do the same again. At least in Japan, these features are not documented in the manual, and Kenwood does not officially announce these, so I'm not sure whether Kenwood service center provides information on TH-77A at your place or not. -------------------------------------------------------------------- In real Life: Yutaka Muto JUNET: muto@nttcoin.ntt.jp CSNET/ARPA: muto%nttcoin.ntt.jp@relay.cs.net HAM: JH1VWP ex.VE3VWP Organization: NTT Communications and Information Prosessing Laboratories Physical mail: 1-2356 Take Yokosuka, Kanagawa 238-03 Japan ========================================================================== r 3807 MSG # TR SIZE TO FROM @BBS DATE TITLE 3807 B# 8246 MODS WA2ISE ALLUS 901207 TH77a mod file Forwarding path: KI4QJ N8GTC N5AAA KK9G KD3O KA3T KA3CNT WA3TSW N2EVW KB1BD WB2HVF W2FMN KD6TH From: wa2ise@kd6th.nj.usa.na (Bob) Message-ID: <992_WA2ISE> Reply-To: wa2ise@wa2ise To: mods@allbbs copied from UUCP: >From: gwalsh@kilroy.jpl.nasa.gov (Gerald J. Walsh) Newsgroups: rec.ham-radio Subject: Here are the Kenwood TH-77A mods! Here is the complete list of mods that are know to date for the Kenwood TH-77A Dual Band hand held: >From the factory, it can receive 138-174MHz and seems to do it quite More? y well with the supplied rubber duck anten ** *can receive 438-450MHz and, likewise, does this quite well too! One very interesting feature of the TH77A is that it can do *DUAL* UHF receive! To do this it uses the VHF receive section and you have less sensitivity, but I really haven't noticed much signal degredation at all. NOW! On to the *EXTRA* capabilities (there are other BASIC functions that I didn't mention, those were just the highlights). After making a few modifications to this radio, you can get it to do the regular stuff that the IC24AT will do, such as AM aircraft, expanded UHF (400-512 depending on PLL lock) and 800-950 (again, depending on PLL lock) in addition to cross band repeat. HOW DO YOU DO THIS!? Easy (if you've got a steady had for removing a chip resistor!). Open it up. There are 3 screws visible on the outside and 4 more More? y underneath the battery pack. Unlike most radios, this one doesn't have a spring for the battery release switch. It gets spring action from the metal plate that you will remove when you take out the four screws. Anyway, the area you will be working in is on the control board which is fixed to the front section of the radio. In particular, look for the yellow electrolytic capacitor (its yellow in mine) that is at the dead center of the board (there are two IC's, one above this and 1 below this). You will have to remove the electrolytic capacitor (C124) and set it aside for a few minutes. You will be putting it back afterward. The reason for removing this is so that you can remove a chip resistor that is underneath it. To avoid tearing the flex board foil traces, do not bend the leads of the capacitor. There is a green wire that is connected to one side of this capacitor. If you disconnect one side of this green wire, you will get RX from 400-512 (PLL lock depends on the radio, but you can DIAL from 400 to 512). Orient the radio so that the volume controls and BNC are at 12 O'Clock on your table (farthest from you) and the bottom (where the battery connects) is at 6 O'Cloc**he area where you More? y removed the capacitor, you will see a blank space where there could have been a chip resistor followed by two chip resistors side-by-side and in the next row below that, you will see 3 more that are side-by-side. There is one to the left of these two rows that is kind of off center. Now, there are three ways to configure this radio at this point: 1 - With one side of the green wire pulled, you will have 136-174 RX, 400-512 RX. If that's all you want, you are done. 2 - By removing the rightmost chip resistor (R129), in addition to keeping one side of the green wire disconnected, you will have 136-174 RX, 400-512 RX, 118-136 AM RX, 800-950 RX. 3 - By removing both of the chip resistors, in addition to putting the green wire BACK where it belongs, you will have 136-174 RX/TX, 400-512 RX/TX, 118-136 AM RX and 800-950 RX. All three of these options include, of course, putting the electrolytic capacitor back in place afterwards. NOTE! ONCE YOU START DOING THIS STUFF, YOUR MEMORIES AND POWER ON SWITCH More? y CONFIGURATIONS WILL ALL BE LOST! MAKE A NOTE OF HOW YOU ARE SETUP BEFORE YOU BEGIN! I I I --------- __ ! ! ! ! ! ! !__! ! ! ! ! =rr <------- remove the right one for AM/800-950 RX ! r ! remove both to also get extended TX ! rrr / ! ___ ! ! ! ! ! ! !__! ! !_________! Layout shown with electrolytic capacitor C124 removed The best way to do this is to heat up both sides of the resistor and More? y push it out of the way with something small. At least this was the best way for me! Once it's out, put the capacitor back in place and close it up. (Put the green wire back also, if you are making the out of band TX mod too!) TO OPERATE THE NEW FEATURES To receive AM aircraft, get the VHF side in the main band and hit the ENT key twice to go to the VFO. Once you are in the VFO, hit the UxU key twice. Once for dual UHF receive and the 2nd time for AM (118-136). To receive 800-950, get the UHF side in the main band and hit the ENT key twice to go to the VFO. Once you are in the VFO, hit the UxU key once. To enable crossband repeat, hold down the SUB BAND UP ARROW key while turning on power. To disable, do the same thing again. Kenwood says that both bands can contain shift information but only one band can include an encode/decode tone. More? y One more thing. The POWER ON + 8 KEY that allows you to select the kind of memory recall will be a bit different. Now, you will have an extra option in the right side of the display. E1 or E2 which may be selected with the VFO control on the top of the radio. E1 mode will allow you to automatically make the radio switch to AM or switch to the 800MHz stuff as you use the VFO knob to move through your memory channels. E2 mode will skip over any memories that are AM or 800-950MHz. In E2, the only way to recall one of the *special* memories is to go to the VFO, hit the UxU key to go to AM or 800MHz and then recall one of these memories. Personally, I have mine in E1 and don't know any reason why anyone would want to be in E2, but its there if you need it! The Kenwood modification sheet says the following about AM sensitivity: While the receiver sensitivity is neither specified nor guaranteed for the AM range, the sensitivity is typically less than 1uV for 10dB signal plus noise to noise ratio between 123-131MHz. The band edges, however, measure between 8-20uV for 1dB S+N/N ratio. More? y SOME PERSONAL OBSERVATIONS My radio seems to have a hole in it in the 800MHz band. I get this beeping sound when I try tuning between 864-875MHz (I believe the TH77A beeps when it can't lock). Also, the sensitivity could be better around 483MHz (local Sheriff). I did notice that using the dual UHF receive and tuning to 483MHz was better than using the straight UHF receive. (Remember, the dual UHF RX uses the VHF section with reduced sensitivity. Well, its reduced in the amateur portion, but seems to be enhanced out of the band!) At around 506MHz (Los Angeles PD) its VERY weak. I could barely hear anything WITH an outside antenna. Maybe some tweaking inside could improve this (I haven't really looked for the VCO yet). By the way, Pontus did mention that checking the input frequency was a bit annoying. You have to hit FUNCTION SHIFT to get the radio to REVERSE and listen to the input. I agree! Anyway, hope this information helps you get more from you new toy! Its a *REALLY* nice radio!! More? y Gerald J. Walsh Jet Propulsion Laboratory -------------------------------------- Note: I haven't tried or verified this, proceed at your own risk. WA2ISE And don't transmit out of band! % *** END OF MSG # 3807 from WA2ISE @ KD6TH.NJ.USA.NA > =========================================================================== >After reading the header, guess what I'm asking about. I'm sure >there's a file out there somewhere, but I didn't see it in the >FTP sites. Sounds like there are some hardware mods, but are >there software mods, too? Any info would be greatly >appreciated! > Thanks! :-) Derry > >Derry Lyons / derry@u.washington.edu finally bought the Alinco DJ560T so I can't tell you if these mods work but I'll give you my mod files anyway. Good luck..... David Horak >From: rharel@fab8.intel.com (RICHARD HAREL) Subject: Re: Kenwood MODS database - NEEDED Here is the complete list of mods that are known to date for the Kenwood TH-77A Dual Band hand held: >From the factory, it can receive 138-174MHz and seems to do it quite well with the supplied rubber duck antenna. It also can receive 438-450MHz and, likewise, does this quite well too! One very interesting feature of the TH77A is that it can do *DUAL* UHF receive! To do this it uses the VHF receive section and you have less sensitivity, but I really haven't noticed much signal degradation at all. Kenwood has made this radio compatible with the new ICOM S-Series radios from what I can tell. It has DTSS (Dual Tone Squelch System) which means that your radio will not break squelch until it hears a particular sequence of three DTMF tones (ICOM has this also and they call it Coded Squelch which also use three tones). The TH77A also has a paging function that works *exactly* like the ICOM paging. You program the radio with a personal 3 digit DTMF code and someone pages you by transmitting YOUR 3 digit code, followed by a * character and then their own 3 digit code. The ICOM will start to ring to let you know that you have been paged and display the 3 digit code of the person that has paged you. The TH77A will beep once and open squelch as long as the person that paged you does not drop carrier (I prefer the ICOM method for this part, but there is a work around that I will mention in a bit). One thing the TH77A does at this point is bring up a timer so you know how long its been since you've been paged. Maximum time is 99 hours and 99 minutes. Let's see if your battery can hold out that long! The workaround so the TH77A will ring, rather than just beep and open squelch is to put the radio in the pager mode AND also put it in Tone Alert. When you get paged... the radio will "beep beep (pause) beep beep" five times and start up the timer. Kenwood has provided two different types of BEEPS for you. The second type is to ring like an electronic telephone. This one *REALLY* sounds nice!! For those of you that like autodial memories, there are 10 memories that can store 15 characters each. There are 40 regular frequency memories in this radio and you can make them all UHF if you like (no restriction). NOW! On to the *EXTRA* capabilities (there are other BASIC functions that I didn't mention, those were just the highlights). After making a few modifications to this radio, you can get it to do the regular stuff that the IC24AT will do, such as AM aircraft, expanded UHF (400-512 depending on PLL lock) and 800-950 (again, depending on PLL lock) in addition to cross band repeat. HOW DO YOU DO THIS!? Easy (if you've got a steady hand for removing a chip resistor!). Open it up. There are 3 screws visible on the outside and 4 more underneath the battery pack. Unlike most radios, this one doesn't have a spring for the battery release switch. It gets spring action from the metal plate that you will remove when you take out the four screws. I love it! Anyway, the area you will be working in is on the control board which is fixed to the front section of the radio. In particular, look for the yellow electrolytic capacitor (its yellow in mine) that is at the dead center of the board (there are two IC's, one above this and 1 below this). You will have to remove the electrolytic capacitor (C124) and set it aside for a few minutes. You will be putting it back afterward. The reason for removing this is so that you can remove a chip resistor that is underneath it. To avoid tearing the flex board foil traces, do not bend the leads of the capacitor. There is a green wire that is connected to one side of this capacitor. If you disconnect one side of this green wire, you will get RX from 400-512 (PLL lock depends on the radio, but you can DIAL from 400 to 512). Orient the radio so that the volume controls and BNC are at 12 O'Clock on your table (farthest from you) and the bottom (where the battery connects) is at 6 O'Clock (nearest you). In the area where you removed the capacitor, you will see a blank space where there could have been a chip resistor followed by two chip resistors side-by-side and in the next row below that, you will see 3 more that are side-by-side. There is one to the left of these two rows that is kind of off center. Now, there are three ways to configure this radio at this point: 1 - With one side of the green wire pulled, you will have 136-174 RX, 400-512 RX. If that's all you want, you are done. 2 - By removing the right most chip resistor (R129), in addition to keeping one side of the green wire disconnected, you will have 136-174 RX, 400-512 RX, 118-136 AM RX, 800-950 RX. 3 - By removing both of the chip resistors, in addition to putting the green wire BACK where it belongs, you will have 136-174 RX/TX, 400-512 RX/TX, 118-136 AM RX and 800-950 RX. All three of these options include, of course, putting the electrolytic capacitor back in place afterwards. NOTE! ONCE YOU START DOING THIS STUFF, YOUR MEMORIES AND POWER ON SWITCH CONFIGURATIONS WILL ALL BE LOST! MAKE A NOTE OF HOW YOU ARE SETUP BEFORE YOU BEGIN! -- -- -- || || || / \ / \ / \ -------------------------- | | | \-\ | | | /---------\ | | | | | | | | | | | | | | | | | | \---------/ | | | | -- -- -- | | || || <================== REMOVE THE RIGHT ONE | -- -- -- | FOR AM/800-950 RX. | -- | REMOVE BOTH TO ALSO | || -- -- -- -/ GET EXTENDED TX. | -- || || || / | -- -- -- | | | | /------------\ | | | | | | | | | | | | | | | | | | | | | | \------------/ | | | | | -------------------------- Layout shown with electrolytic capacitor C124 removed The best way to do this is to heat up both sides of the resistor and push it out of the way with something small. At least this was the best way for me! Once it's out, put the capacitor back in place and close it up. (Put the green wire back also, if you are making the out of band TX mod too!) TO OPERATE THE NEW FEATURES To receive AM aircraft, get the VHF side in the main band and hit the ENT key twice to go to the VFO. Once you are in the VFO, hit the UxU key twice. Once for dual UHF receive and the 2nd time for AM (118-136). To receive 800-950, get the UHF side in the main band and hit the ENT key twice to go to the VFO. Once you are in the VFO, hit the UxU key once. To enable crossband repeat, hold down the SUB BAND UP ARROW key while turning on power. To disable, do the same thing again. Kenwood says that both bands can contain shift information but only one band can include an encode/decode tone. One more thing. The POWER ON + 8 KEY that allows you to select the kind of memory recall will be a bit different. Now, you will have an extra option in the right side of the display. E1 or E2 which may be selected with the VFO control on the top of the radio. E1 mode will allow you to automatically make the radio switch to AM or switch to the 800MHz stuff as you use the VFO knob to move through your memory channels. E2 mode will skip over any memories that are AM or 800-950MHz. In E2, the only way to recall one of the *special* memories is to go to the VFO, hit the UxU key to go to AM or 800MHz and then recall one of these memories. Personally, I have mine in E1 and don't know any reason why anyone would want to be in E2, but its there if you need it! The Kenwood modification sheet says the following about AM sensitivity: While the receiver sensitivity is neither specified nor guaranteed for the AM range, the sensitivity is typically less than 1uV for 10dB signal plus noise to noise ratio between 123-131MHz. The band edges, however, measure between 8-20uV for 1dB S+N/N ratio. SOME PERSONAL OBSERVATIONS My radio seems to have a hole in it in the 800MHz band. I get this beeping sound when I try tuning between 864-875MHz (I believe the TH77A beeps when it can't lock). Also, the sensitivity could be better around 483MHz (local Sheriff). I did notice that using the dual UHF receive and tuning to 483MHz was better than using the straight UHF receive. (Remember, the dual UHF RX uses the VHF section with reduced sensitivity. Well, its reduced in the amateur portion, but seems to be enhanced out of the band!) At around 506MHz (Los Angeles PD) its VERY weak. I could barely hear anything WITH an outside antenna. Maybe some tweaking inside could improve this (I haven't really looked for the VCO yet). Many thanks to Pontus Hedman (rph@sq.com) for helping me put this information together! Thanks also goes out to James Dugal (jpd@pc.usl.edu). By the way, Pontus did mention that checking the input frequency was a bit annoying. You have to hit FUNCTION SHIFT to get the radio to REVERSE and listen to the input. I agree! Anyway, hope this information helps you get more from you new toy! Its a *REALLY* nice radio!! Gerald J. Walsh | Internet: gwalsh@kilroy.jpl.nasa.gov Jet Propulsion Laboratory | Phone : (818) 354-3913 RF and Microwave Subsystems Section | Fax : (818) 354-2825 M/S 238-528 | 4800 Oak Grove Drive | Pasadena, CA 91109 | Looks good! One more feature worth mentioning for humour value: If you hold down M and PTT and power up, the HT enters "game mode". You get "0000" on the left of the screen. Press "0" and digits start changing rapidly in hex (consequently all appearing as "8"). By pressing 1,2,3 or F you stop the appropriate column. If they all come up the same, er, well I guess you win... maybe something good happens then. Maybe it enables transmit on, cellphone, air, and 30cm :-). At 1 chance in 65536 I'm not about to try to find out, though... (Somebody with the service manual told me the above) -- Pontus Hedman rph@sq.com {uunet|utzoo}!sq!rph VE3RPH (416) 963-8337 Despite what I said in my previous msg about not wanting to try it, I just did. Much to my amazement, after only one or two minutes, I won! By timing the keypresses very carefully, one can improve the chances from 1 in 4096 significantly, it seems [ignore my "1 in 65536" in my previous mail, obviously I wasn't thinking straight.. obviously there are 16 winning combinations out of 65536] And yes, something Interesting does happen when you get all four numbers the same (at least when you get "2222" like I got). More specifically, the display starts doing something humorous. 3/14/91 -- A few more observations: Many of the TH-77a's with 206* serial numbers have problems with memory loss when they are operating and the pack runs down. This is cured by a resistor change. AES replaced it in my TH77 without charge. I don't know which resistor needs to be changed, however. Also, some of the newer TH77a's seem to have a tone mixing with the audio. PL disable has no effect; speculation points to a dc-dc converter in the LCD display circuitry. Due to the weak audio I generally run the volume near max. And I find that my ears are hurting from the high-pitched noise when the HT squelch closes. This is most irritating! I recently did some sensitivity measurements of the TH77a. Here are the results again: SENSITVITY MEASUREMENTS TH-77A USING AN IFR MOD 1000S SERVICE MONITOR 1000 HZ TONE REFERENCE IS 2 LCD SEGMENTS LIT FREQ. SIGNAL MHZ MICROVOLTS 118 1.6 AM 123 0.5 128 0.5 133 0.7 136 0.8 136 0.3 FM 141 0.3 146 0.4 151 0.4 156 0.4 161 0.5 166 1.0 171 2.0 174 2.5 FREQ. SIGNAL SIGNAL MHZ uV. uV. VHF VFO UHF VFO 400 8.0 NO RX 410 3.0 20.0 420 2.0 5.0 430 0.8 1.0 440 0.5 0.3 450 0.7 0.3 460 1.0 NO RX (birdie?) 470 1.7 3.5 480 3.0 20.0 490 5.0 40.0 500 7.0 50.0 512 NO RX 80.0 800 30.0 810 15.0 820 5.0 830 3.0 840 2.0 850 1.7 860 NO RX 870 3.5 880 4.5 890 5.0 900 6.0 910 8.0 920 11.0 930 15.0 940 15.0 950 15.0 >From PPDDC@UWOCC1.UWO.CA Mon Jul 22 07:57:58 1991 Received: from [129.100.2.12] by eugene.convex.com (5.61/1.28) id AA00793; Mon, 22 Jul 91 07:57:56 -0500 >From: Dave Colvin To: horak@eugene.convex.com Dave: Would recommend TH77 far and away above the 470. I sold my Yaesu to get the Kenwood. The 77 has the following advantages after mods: -rx in aeronautical am band -wide rx & tx in vhf into marine -wide rx & improved tx in uhf (my work repeaters) -800 mhz rx (local fd) -separate volume & squelch for each band -pl decode on sub-band -more memories and all could be vhf or uhf The only thing that I will say about the 470 is that it had better audio and that the antenna was more efficient on the ham bands. ******************************************************************************* DAVE COLVIN University of Western Ontario Systems Development & Services Building, Room 120 Communications Officer London, Ontario N6A 5B9 Physical Plant Department Work (519) 679-2111 PPDDC@UWOCC1.UWO.CA Extension 8873 Amateur Radio Operator VE3ZDC CANWARN Severe Weather Watcher Packet Radio VE3ZDC@VE3GYQ Communications Officer ARES London Air Patrol/CASARA London Red Cross Disaster (Civil Air Search & Rescue Assoc) Planning Committee Home (519) 680-0802 ***************************************************************************** >From: Mysterious Ways To: derry@milton.u.washington.edu Subject: Re: Kenwood TH-77A Mods I have modified my 77 (and many friends) for out of band receive, crossband repeat, and out of band xmit. They are all hardware mods. If just just want normal out of band receive and cross band, open your radio and cut the green jumper. Other mods require you to take out chip resistors.. ___ Andrew J. Doane ___....-----'---`-----....___ 409 E. Chalmers #1307 ========================================= Champaign, IL 61820 ___`---..._______...---'___ ajd@turing.acs.virginia.edu (___) _|_|_|_ (___) Email: ket@uiuc.edu \\____.-'_.---._`-.____// ~~~~`.__`---'__.'~~~~ . "Damn it Jim, I'm a doctor NCC-N9KET . not a ham!" . _____..---========+*+==========---.._____ ______________________ __,-='=====____ =================== _____=====`= (._____________________I__) - _-=_/ `---------=+=--------' / /__...---===='---+---_' '------'---.___ - _ = _.-' TCP/IP: n9ket@wb9uus.ampr.org `--------' Packet: n9ket@n9hsi.il.us.na ============================================================================== Msg Nr. : 192986 Da : IW3GRX Per : TEMP Tipo/status : PN Data/ora : 0521/1522 Dimensione :11605 Bid (Mid) : 61914_IW3GRX Titolo : i Alcune modifiche per il TH77 ****************************************************************************** Erweiterungen der TH77E ( Teil3, beinhaltet Teil 1 & 2 ) 24-02-91 ============================================================================= Frequenz erweiterung TH77E Natuerlich ist es bei den TH77E von KENWOOD auch wieder moeglich den Frequenzbereich zu erweitern. Aber leider! Die SMD-Bauteile sind so klein das man eigentlich schon vorher wissen muss welche Bauteile entfernt werden muessen. Man kann aber doch recht einfach den RX/TX bereich erweitern. Dazu muss man W5 entfernen (oder abkneifen)(Rechter Widerstand ist schon entfernt). Diesen W5 ist ein Gruener Draht der unterhalb den HD 404608H liegt. 5 Schrauben entfernen und dann den Sandwich oeffnen, auf der Seite wo der Lithium-Battarie sich befindet sind zwei Flatpack IC's zu sehen, der kleinste is denn HD 404608H. Jetzt hat man einen erweiterten Bereich von 136MHz bis 174MHz und auf 70cm von 400MHz bis 512MHz. Aufgepasst! RX und TX. ----------------------------------------------------------------------------- ! HD 404608H ! W5 = Gruener Draht !______________________! C = Elko (verklebt) W5 R = O ohm Widerstaenden R R R C ---------- Bild 1 ----------------------------------------------------------------------------- Natuerlich gibt es auch andere Kombinationen, weil es noch drei Widerstaende gibt. Im Schaltplan liegen sie unter diesen W5. Bei mir ist aber den Elko so verklebt worden dass ich da fast nicht 'ran komme. Aber denn noch habe ich nach ein Bericht von WYNS Pedro, ON4AWQ einiges versucht. Nur linker R : 2m RX von 136 - 174 MHz, TX 144 - 148,6 MHz eingeloetet, 70cm RX und TX 430 - 440 MHZ kein W5 Kein 1750Hz Ton. Weiter alles normal(?) Nur mitlere R : 2m RX von 136 - 174 MHz, TX 144 - 146 MHz eingeloetet, 70cm RX von 400 - 512 MHZ, TX 430 - 440 MHz kein W5 Weiter alles normal. Alle R's : 2m RX1 von 118 - 136 MHz, Kein TX entfernt, RX2 von 136 - 174 MHz, TX 144 - 146 MHz kein W5 (RX3 ist der RX2 von 70 cm) 70cm RX1 von 335 - 400 MHz, Kein TX RX2 von 400 - 512 MHZ, TX 430 - 440 MHZ RX3 von 800 - 950 MHz, Kein TX Funktionsumwandelung einiger tasten: MHz <> TONE SCAN <> SHIFT STEP > T.ALT SUB D <> REV T.ALT > T.SEL Kein 1750 Hz. UxU Taste als RX Umschalter (RX1,RX2,RX3; 2 & 70) Transponder Funktion. ============================================================================= Der Empfindlichkeit. (1) AM im Bereich von 2m RX1 funktioniert aber ist sehr verzehrt, wegen der FM Demodulator. Emphinflichkeit : 2 m RX1 Geht einiger maessen. (Keine genaue angaben) der Emphanger RX2 Sehr gut. (auf 145 MHz kleiner 15uV 12dB/S/N) RX3 Fast so gut wie RX2 70cm. (einige uV weniger) 70cm RX1 nicht probiert. RX2 Gut (auf 435 MHz Kleiner 18uV 12dB/S/N) RX3 Nach was Ich probiert habe scheint er mir Taub. (2. Harmonische von 70cm & Autotelefon) Biede messungen im Band sind durch gefurht worden warhend ein Amateurveranstaltung in Assen, Niederlande. ----------------------------------------------------------------------------- Der Empfindlichkeit. (2) Dies sind genauere messungen, gemacht am 23-2-91 beim HDTP (unsere aufsichts Behoerde) an einen Rohde & Schwarz Messplatz, waehrend das NAT (Noordelijk Amateur Treffen). Das gemessene Gerat war ein TH77E S/NO. 10801184 (00170) angeschlossen an eine vollig aufgeladene 12V Akku PB-8. Der Squelch war voellig geoeffenet. 118,000 MHz 1,79uV 20dB Sinad | 125,000 MHz 0,86uV ,, | RX1 2m 135,000 MHz 0,35uV ,, | 145,000 MHz 0,35uV ,, | 155,000 MHz 0,26uV ,, | RX2 2m 165,000 MHz 0,28uV ,, | 173,775 MHz 0,41uV ,, | 400,000 MHz 1,18uV 20dB Sinad | 425,000 MHz 0,54uV ,, | 435,000 MHz 0,54uV ,, | RX3 2m (70cm empfang mit UxU ) 450,000 MHz 1,00uV ,, | (function also mit block-) 467,000 MHz 3,04uV ,, | (down converter nach 2m ) 475,000 MHz 4,90uV ,, | (empfanger. ) 500,000 MHz 15,70uV ,, | 511,000 MHz Keinen empfang | 335,000 MHz Keinen empfang | 350,000 MHz Keinen empfang | RX1 70cm 375,000 MHz Keinen empfang | 400,000 MHz 12,50uV 20dB Sinad | 425,000 MHz 0,58uV ,, | 435,000 MHz 0,50uV ,, | 450,000 MHz 1,00uV ,, | RX2 70cm 467,000 MHz 4,35uV ,, | 475,000 MHz 8,52uV ,, | 500,000 MHz 53,00uV ,, | 511,000 MHz 59,25uV ,, | 800,000 MHz Keinen empfang | 850,000 MHz Keinen empfang | RX3 70cm 900,000 MHz Keinen empfang | 949,975 MHz Keinen empfang | ============================================================================= Transponder Funktion. Wenn man den Schaltplan genauer anschaut erkennt Man einen Repeater-Switch der den Audio-aus mit den Mike Eingang verbindet. Aber wie schaltet Man diese Funktion ein? Dieser Funktion funktioniert nur dann wenn alle Brucken entfernt sind (W5 & 3*R). Man muss vorher die richtige einstellung der VFO's machen (1 auf 2m, 1 auf 70cm), Gereat ausschalten und dan mit SUB UP gedruckt wieder anschalten. ! RX auserhalb des Amateurbandes kann auch uber der Transpondermode ! ausgestraelt werden. Waerhend des Transponder modes reagiert der TH77 auf keiner Taste. Ausschalten der Transponder Funktion durch Geraet aus zu schalten und beim anschalten der SUB UP Taste gedruckt zu halten. ============================================================================= PR mit der TH77 Packet Radio funktioniert bei mir einwandfrei ohne einen Zusatz oder Umbau. Ich habe den TH77 an einer PK88 angeschlossen mit RX an RX, TX an TX und PTT an PTT, also sehr einfach. Mit den TXDelay konnte ich bis 10ms herunter. Auch denn empfang von Packet Stationen war keinen Problem aber schalte den SAVE und APO der TH77 aus! Ich habe auch einen Versuch gemacht mit 2 empfaenger gleichzeitig angeschaltet auf 2 verschiedene Packetfrequenzen und dass geht wenn nicht gleich zeitig einen Signal empfangen wird. (wegen Kollisionen) Auch geht es wenn man einen Frequenz auf den OV-Kanal hat und den eingebauten Lautsprecher benutzt und ueber der Lautsprecherausgang den TNC ansliesst und auf eine Packetfrequenz steht. Man muss nur der OV-Kanal nicht zu laut setzen, auch kann dass offenen der Squelch ein problemen feur dass Packetsignal sein aber auch hier gilt den OV-Kanal nicht zu laut zu setzen. ============================================================================= Ein Spielchen auf der TH77 (auch fuer den TH27 & TH47) JACKPOT ! Jackpot anschalten durch: beim einschalten des Gerats den Tasten 'PTT' & 'M' gleichzeitig gedrueckt zu halten. Links im display erscheint 0000. Jetzt kann Jackpot gestartet werden durch tatse '0' zu druecken, die Ziffern anderen sich jetzt schnell. Mit die Tasten '1','2','3' und 'F' konnen die Ziffern gestopt werden. Bei 4 gleiche Ziffern muss das Gerat eine Melodie spielen. (mir noch nicht gelungen) Aus schalten dieses Spielchen durch 'LAMP' zu druecken. ============================================================================= Problem mit der Frequenz. Philip PE1AUE hat bei sien TH77 folgendes problem; Beim entfrenen der W5 hat er die oben erwaehnten Frequenzbereiche aber, die wirkliche Frequenz stimmt nicht mit die im Display angezeigten Frequenz. Auf 2m ist die differenz -25 KHz und auf 70cm -62,5 KHz, also 145 Mhz im Display ist in wirklichkeit 144,975 MHz und 435 Mhz im Display ist 434,675 MHz. Bei mir ist dieses Problem nicht aufgetereten. Ich habe dafuer keine erklaerung finden koennen. Vieleicht jemanden? ============================================================================= Vorsicht bei der Umbau! Es ist mich waehrend der Umbau passiert dass das Geraet nicht mehr funktionierte. Man muss aufpassen das der Loetauge der Elko nicht verrutst wenn man das Klebemittel der Elko entfernt, oder den Beinen der Elko umbiegt. Auch kann einfag ein Loetauge der Widerstanden sich loessen. ============================================================================= Letztes Wort Ich muss sagen ein schoenes kleines Gerat mit viele moeglichkeiten. Wer noch etwas findet was ich noch nicht gefunden hab' ,schickt bitte ein bericht an mich. Viel Spass bei der Bastelei. ============================================================================= Ich Bedanke mich bei: Philip Pe1aue / sysop Pi8nvp WYNS Pedro, ON4AWQ @ ON7RC-5 (Transponder & Fun mod..) dHR. Sengers, beamte HDTP-OZ (fuer seinen geduld) **************************************************************************** HI there Kenwood lover, You are not going to believe this. While designing the microprocessor circuitry of the TH77-27-47 series, the kenwood-engineers decided to include a game in the logical functions of the rigs. You won't find any of this in the manual because I think they were to afraid to be taken for fools if they would publish this... TH77-TH47-TH27 JACKPOT GAME... ------------------------------ To activate the game mode: -switch off the rig -push 'Memory' and 'PTT' together with 'power on' -display gives 0000 -start game with '0' -display starts rolling -stop the digits by pushing separately the upper row of the keyboard '1' , '2' , '3' and 'f' -try to get 4 same characters and then the rig should play a 'tune' P.S. I did not succeed yet... To get out out of the game mode, pusch 'lamp' Lots of fun provided..... Who said a transceiver was ment for communication... 73 Pedro WYNS, ON4AWQ @ ON7RC-5 **************************************************************************** ****************************************************************************** de DG1FCQ @ DB0EAM Es ist beim Kenwood Duoband-Handy TH77E doch moeglich Schrittweiten von 5 und 15 KHz im 70cm-Band einzustellen !!! Hierzu muss man in den Duobandmodus (Main-Band 70cm, Sub-Band 2m) gehen, im Sub-Band einen Speicherkanal (z.B. 0) anwaehlen und dann wie ueblich die Tastenkombination zur Aenderung der Schrittweite betaetigen (F + MHZ). Nun veraendert man die Schrittweite anstatt mit dem Hauptabstimmknopf, mit der Sub-Up- und Sub-Down-Taste. Hierbei ist es zusaetzlich moeglich 5 und 15 KHz Schrittweite anzuwaehlen. Die Bedeutung des dabei ebenfalls einstellbaren "Muells?" ist mir nur soweit bekannt, dass sich dahinter die standart Schrittweiten verbergen. Falls Fragen zu diesem Thema auftreten oder neue Funktionen des TH77E entdeckt werdenkoennen Sie eine entsprechende Nachricht in meiner Homebox hinterlassen. Dominik Homebox DB0EAM-3 (Kassel) ****************************************************************************