1/1/93


JANUARY 1, 1993
TO:RUDY WB5UUK
FROM: ROGER WB0GAI
RE: 9600 BAUD MODS

DEAR RUDY,
     THIS LAST YEAR I MODIFIED MY YEASU 726R TO WORK WITH THE AEA
DSP-2232 FOR 9600 BAUD. I HAVE BEEN USING IT FOR SEVERAL MONTHS WITH
GOOD SUCCESS.

     I FOUND THAT ON RECEIVE, THAT HOOKING DIRECTLY TO THE ANODE OF 
DIODE D04 ON THE RX UNIT THAT I HAVE VERY GOOD RESULTS.

     ON THE SAT UNIT I FOUND THAT LOCATION C25 ON THE + TERMINAL I 
WAS ABLE TO GET AN OPTIMUM SIGNAL INTO THE SATELLITES. 

     OF COURSE I USED SHIELDED CABLE AND GROUNDED EVERYTHING CAREFULLY.
PTT IS THE SAME AS ALWAYS, AT THE BACK OF THE RADIO AND AT THE MIC CONNECTOR.

     THAT IS ABOUT IT. IT TOOK AWHILE. ONE THING TO EMPHASIZE IS THE IMPORT-
ANCE OF HOOKING THE TRANSMIT CONNECTIONS TO THE SAT UNIT AND NOT TO THE TX 
UNIT. WHEN YOU GO INTO THE SAT UNIT THE TX UNIT IS OUT OF THE LOOP MORE OR
LESS.

73'S AND GOOD LUCK,
DE ROGER WB0GAI



7/16/92

From      : ve1hd
To        : g6zru
Title     : 9600.hlp
Keywords  : your request
Uploader  : VE1HD 
Uploaded  : Tue Jul 14 15:27:29 1992
__________________________
   Hi there Fred, the handle here is Clarence and the QTH is near Sydney
Nova Scotia. I saw your request for help with 9600 baud on the FT-726, that
is what I use here with a PacComm external 9600 baud modem and it works well
or at least I think it does. I have only been on the high speed bird for 
about a week now. The following info was sent to me some time ago by one
of the chaps stateside and it seems he obtained it from one of the chaps in
JA land. I did the mod exactly as it is described, the only thing extra I
did was to add a small relay to automatically switch to between Satellite
and Simplex, I key the relay from the 8v line that gets switched by the
satellite switch when you select either of the satellite modes. I picked up
this voltage on Pin 6 of plug J05 on the satellite board. I used a small
5v SPDT, TTL compatible relay with a 47 ohm resistor in series with the 
coil and it works fine. The TX audio is wired to the common, the TX module
modulator to the normally closed and the Sat module modulator to the normally
open and it works fine. I used small sheilded wire and mounted the relay
with a small piece of double sided tape.
  The following is the info on where to pick up the RX and TX audio in the 
radio.

The following was received from JA6FTL, I have not yet got
around to doing it.
========================================================================

Hello Tom,

 My mods to FT-726 is as follow.

1. RX data connection
 RX signal is drawed from the junction R44-DO4(1S188) with 10K ohm resistor.
 It must be connected to RX in of G3RUH modem

2. TX data injection
 You must inject both TX unit and Satellite unit if you need full duplex
 operation ( example for uosat4/5 ).
 The TX data injection point is  DO5(FC-53)-C27 in TX unit and
 DO6(Fc-53)-C25 in SAT unit. You may be able to direct connect from
 TXD out of G3RUH modem as DC decoupling is in the modem board.

3. You need selection SW for TXD injection to select sinplex/full duplex
 operation.

73s.   sueo  @ uo-14, ao-16, lo-19, FO-20

=========================================================================
73 Tom K8TL

  That was the info received from Tom K8TL. Hope it works for you and 
all the best from Clarence ... VE1HD -=>



3/10/91

FT726.1

de ON4KVI @ LX0PAC

To improve the Auto-doppler control on my 726R which has 20hz steps, I
installed a 555 multivibrator circuit across the tuning switch which shorts
the line 2 times a second.

It now pulls the circuit into tune from 300 hz either side.

W9ODI