Msg Nr.     : 32382 
Da          : LU7AKC
Per         : NET9K6@WW      
Tipo/status : B$
Data/ora    : 0815/0200
Dimensione  : 2479
Titolo      : TM731 & 9600 Bps
Bid (Mid)   : 12262_LU7AKC

TM-731 & 9600 Bps.

The TM731 is different enought to cause problems.
What need to be done is to add another RX Mute transistor. (look the schematics
and see how the TX deviation is shorted to ground during receive.)

Use a plain NPN and a pair of 10k resistor (copy the one used on VR3 in the
schematics.)

Take the TX DATA and feed it to the collector through a series 1k resistor, and
then feed that through another 1k resistor to the wiper on the deviator pot.
This was a result of Kenwood changing the deviation pot value from 10k to 100k
(it's wasn't broken, but they fixed it anyway.) It is full of surface mount
devices.

Article of Jeff WA6FWI @ WB6YMH.#SOCA.CA
From: CQ USA - June/92

Msg Nr.     : 142594
Da          : IW3GRX
Per         : TEMP  
Tipo/status : PN
Data/ora    : 0129/1242
Dimensione  :  910
Bid (Mid)   : 11522_IW3GRX
Titolo      : Modifica 9600 baud per il TM731

*****************************************************************************

From: LU7AKC@LU7AKC.#COL.CF.ARG.SOAM
To  : NET9K6@WW

TM-731 & 9600 Bps.

The TM731 is different enought to cause problems.
What need to be done is to add another RX Mute transistor. (look the schematics
and see how the TX deviation is shorted to ground during receive.)

Use a plain NPN and a pair of 10k resistor (copy the one used on VR3 in the
schematics.)

Take the TX DATA and feed it to the collector through a series 1k resistor, and
then feed that through another 1k resistor to the wiper on the deviator pot.
This was a result of Kenwood changing the deviation pot value from 10k to 100k
(it's wasn't broken, but they fixed it anyway.) It is full of surface mount
devices.

Article of Jeff WA6FWI @ WB6YMH.#SOCA.CA
From: CQ USA - June/92

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