From: Andrew G8TZJ
Subj: 9600 Baud Rig Mods.

Hello John, the two rigs that I use for pacsat use are the Icom IC211e and
the IC471e. G3RWL has already told you how he has obtained the 9600 output
from the 471, and I have taken my Rx feed from the same point.
     For the 211 I have only modified the rig for transmit. I chose the
slider of the Deviation pot R59 as the input point as it has a low
impedance as recommended for the G3RUH 9600 board. A screened lead can be
soldered to the centre connection of R59 on the component side of the board
if the surrounding components are bent slightly to allow access. The braid
should be connected to ground near to R59. I found that the upper end of
R57 was connected to ground. Check this on your 211 just to make sure that
your 211 has NOT got this resistor in the other way round.
      I have adjusted the drive level for a deviation of approximately
2.5 kHz, and this seems OK. The only problem now is the change over time
for the relays, (I have a Mutek front end board fitted which by-passes the
PIN diode switch) but I am working on that.
     73 Andrew G8TZJ @ GB7FCI or @ UOSAT3
The following addendum was received in Oct, 1991:

Some time ago, I sent you the modification that I did to my ICOM IC-211 to make
it compatible with 9600 baud data. Well I now have to admit that I got it wrong.

I put the data into the slider of the deviation pot but I missed seeing the
following R / C filter on the circuit diagram until recently. When I checked the

Tx eye on the anode of the varicap diode it did not look to good. I now inject
the 9k6 data directly onto the varicap diode's anode, D11. It is a big problem
to get to this point, so you can get to the left hand end of C53 from the
component side of the main PCB (just) and use this as the injection point.
Ground is available on the can of L12 which is nearby. I hope that I have not
caused people too much of a problem with the poor eye that they would have had,
if they used my previous suggestion.
          73 Andrew G8TZJ @ UO-14