I received the following Icom IC-970 9600 baud FSK Mod directly from ICOM.

It was accompanied with a diagram for using an AEA DSP-2232 between an

IC-970 and IC-728 for switching. If anyone is interested in this diagram

please request it from ICOM tech support.

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The following is verbatim what was printed on the sheet from Icom. It was

submitted to them by someone but no name appears on the sheet.

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The following describes mods for 9600 baud FSK for an Icom IC-970. The

mods require NO soldering or cutting on the IC-970, and are thus easily

reversible.

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Icom suggested mods for 9600 were:

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- TX mod input at collector of Q59 on the main unit.

- RX Main at DET output in J29 (main unit).

- RX Sub at TSAOS output in J9 (main unit).

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I made slight mods to Icom's mods:

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- TX mod input at collector of Q59 on the main unit. This is available at the

  top of R51 with a micro clip. Ground is at the top of R60 with a micro clip.

  These resistors are about 3" back from the front of the Main unit and 2"

  from the right. The micro clips were attached to a length of RG-174 mini

  coax. No mods to board! The leads of the resistors appear to be painted.

  Scrape the paint off with a small, sharp knife (a small mod).

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- RX Main output at TSAOM at J29 (main unit). Available on P85 (tone

  squelch option socket) under the top cover.

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- RX Sub output at TSAOS at J9 (main unit). Available on P87 (tone

  squelch option socket) under the top cover.

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Two lengths of RG-174 mini coax were connected to a 6-pin headers with the

center conductor on pin 4 and ground on pin 3. The headers were covered

with heat-shrink tubing. The headers plug into P85 (MAIN) and P87 (SUB).

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The three coax cables were routed to the back-right of the IC-970 case. The

two TVJ hold covers were removed and replaced by two dual RCA jack

boards. These boards were attached with a small bolt through the hole for the

TVJ screws. The coax was attached to three of these jacks.

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This is the end of the mods that I received from ICOM.

Bruce Paige, KB5ZRV                       Packet KB5ZRV@F6CNB

AMSAT Area Coordinator, Houston           Internet  KB5ZRV@AMSAT.ORG

/EX