Have a look at http://www.geocities.com/n2uhc/interface.html
This is the opto-isolated circuit I initially built for my HW-100 and it works just fine with the ICOM radios. The above circuit should work on your FT-101. The important thing is that the rig should not drift. While a jump of 50 Hz is OK on SSB, it will cause loss of signal on digital. You will be able to spot a drifting problem by watching the signals on the waterfall. I can send you a 4N35 if you can't source one locally; I'm fairly certain I have some spares. Radio Shack used to have 1:1 600 ohm transformers but I don't know if they still carry these anymore. Good luck and join the fun on digital. 73, Bernie ----- Original Message ----- From: Bob To: digitalradio@yahoogroups.com Sent: Monday, January 22, 2007 7:18 AM Subject: [digitalradio] PSK and Yeasu ft-101 Hi Gang! I am fairly new here to this group and have been reading some of the posts. I would like to know if anyone here is using a older rig like mine, a Yaesu FT-101 Z and running PSK31 mode, and what kind of interface they are using. I have seen several schematics for homemade interfaces and am unsure which would be the best to use, I have a 1.8 GHZ computer and a sound card in it. Thanks Bob KC9GMN
