9/6/94 To : ZP6XD From: W5RKN Time: 142347UTC Date: 06 Sep 1994 ----------------- Hello Dean, > I have a friend here who is trying to get on the sats and >has just bought a new ICOM 970H rig. He wants to know if there >are any mods available or necessary for this rig. The following are the mods I use: Icom IC-970 9600 baud FSK Mods 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. Icom suggested mods for 9600 were: * 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). I made slight mods to Icomís mods: * 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). * RX Main output at TSAOM at J29 (main unit). Available on P85 (tone squelch option socket) under the top cover. * RX Sub output at TSAOS at J9 (main unit). Available on P87 (tone squelch option socket) under the top cover. 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). The three coax cables were routed to the back-right of the IC-970 case. The two TVJ hole 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. 73 from Ron - W5RKN Beta testing the TAPR/AMSAT DSP-93 unit - ask me about it! ------------------------------------------- Austin, Texas USA Internet : 71371.2110@compuserve.com Internet : w5rkn@ausgw.kb5rsy.ampr.org SAT : KO-23, KO-25 CIS : 71371,2110 -------------------------------------------