ллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллл Newsgroups: rec.radio.amateur.misc From: jtg0707@uxa.cso.uiuc.edu (Jui Tien) Subject: Alinco DJF1T mods Message-ID: Summary: Mods for extended receive and transmit Sender: usenet@news.cso.uiuc.edu (Net Noise owner) Organization: University of Illinois at Urbana Date: Sat, 17 Oct 1992 16:29:39 GMT Keywords: Alinco Lines: 38 First of all, thanks for all the people who sent me email on the DJF1T mods. I've tried it and it works!! Here is the summary: Open the radio and place it face down with the BNC jack up, and locate two jumper wires on the lower right hand corners of the set. The red jumper is for extended receive, and the blue(I think it is blue?) jumper is for extended transmit. Just cut/unsolder the red jumper for extended receive, blue for extended transmit, or both jumpers if you want both. Push the F button while turning the set on to reset radio to factory defaults. The extended receive (AM aircraft) can be activated by pressing the B button on the keypad. (If you cut both jumpers) A letter A will show up on the LCD indicating that radio is in the AM mode. To go back to FM, just press B again. I think B just activates a second VFO in the radio, since radio retains the AM frequency when toggle in and out of te AM mode. My serial number is 8221, so this mod should work for radio with serial numbers close to mine. The radio will not transmit in AM mode, but it will transmit up to the ~160MHz range. I can say that it works up to the weather band frequencies. I've checked it by transmitting on 162MHz to a FT-415 at the lowest power setting inside an enclosed screen room. Try this mod at your own risk! A few words about the radio in general. I had the radio for about two days and I already had several IFR flights with it on board an airplane. The radio performed flawlessly. The fit and finish of the radio is excellent. The entire radio case is cast luminum, except the battery case, which is plastic. The only gripe I have about the radio is the battery latch. It seems to do the job, but looks a little flimsy. If I really sqeeze the radio HARD, I can feel a tiny bit of movement between the battery case and radio. But I complaint about the same thing about the glove compartment in my Honda.... I prefer the what we pilots called " human engineerd" aspect of the radio. Most of what I use in the airplane are rarely more than two buttons away. God only gave me two hands a while back, and I need one to fly the airplane, and the other to toggle the radio controls. Cheers J.T. ллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллл DJF1T To extend the Alinco DJ-F1T 2m HT reception to cover the 108-143 MHz AM band (air-band, double sideband AM): 1) Jot down any memory positions you have entered. There's a good possibility that you'll lose them in the process. 2) Turn off HT and remove battery pack. 3) Remove the 5 screws to gain access to the logic board. There are 4 screws located on the rear panel of the HT with the 5th screw located just under the PTT. Do not remove the screws holding the battery contacts to the rear panel. 4) Gently separate the rear panel from the front panel by holding open the battery lock switch (on the bottom of the HT) and holding the antenna BNC connection to swing the panel open, away from the display and button pad. Note: Steps 3 and 4 are outlined with diagrams in the DJ-F1T manual, page 52. Proceed gently. The panel will reveal two logic boards connected by wire ribbons. If you tear the ribbons, you're in mucho trouble! 5) Look at the logic board that's on the front panel (towards the display and button pad). Locate a red and a blue jumper wire on the lower 1/2 of the board. These two wires should be right next to each other. 6) Clip the red wire. This enables the 108-143 MHz AM receive. Note) If you clip the blue wire, this will enable extended TX for MARS and CAP operation (The TX is disabled in the AM mode). 7) Make sure you arrange the clipped wire(s) in such a way that it doesn't short out anything. 8) Reassemble the HT and put the screws back in! 9) Put the battery pack on and reset the HT (this is where you'll lose the memories) to enable the new features. 10) The AM aircraft mode can only be activated in the VFO mode (but can be later saved into one of the 40 memory channels). In the VFO mode, press the "B" key on the pad. The display will now show an "A" towards the upper left corner, just under the power setting indicator. The frequency should also change to somewhere between 108 and 143 MHz (note, while in the aircraft mode, the freq. range is 108-143 MHz. In the FM mode, the range is 138-175 MHz). 11) The "B" key toggles back and forth between aircraft and FM. You can dial or enter a frequency between 108 and 143 MHz. The step rate here is 10 kHz but it can be changed (see your owner's manual). лллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллл