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Author Topic: How to test a RASCAL without your rig?  (Read 3082 times)
WA7KPK
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Posts: 129




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« on: January 23, 2002, 12:36:58 PM »

Well, as I said in an earlier message on this forum I've just about finished putting a Buxcomm RASCAL together for my Yaesu FT-101EE. A cursory test shows that it switches the T/R properly (LED goes on and resistance across the PTT circuit drops) when I click the T/R button in Digipan. Haven't checked the audio yet but I plan to tonight after work.

I'll be able to check the receive capability with no problems, but the transmitting will be problematic because I'm not set up to transmit and won't be for a week or two at least -- got to take the radio in to the shop for some work and put up an antenna first. So is there a quick & dirty way to see if anything is coming out of the mic plug before I hook it up to the Yaesu? My testing equipment consists of a VOM and . . . um, well, a VOM.

73, Creede
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K0HZI
Member

Posts: 470




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« Reply #1 on: January 24, 2002, 09:41:07 PM »

You could put clip leads on the audio output of the interface, disconnect the computer speakers and put one clip lead to the tip and one to the sleeve on the computer speaker plug, vary the pot in the interface until you hear the PSK tones in the speaker.  You may need to have the volume on the sound mixer application at max, in the interface there is a voltage divider (pad) to lower the output to the transmit audio so you don't overdrive the transmit audio.  Also look at this page for setting the sound card so you don't have bad transmit IMD when you get the rig back and go on the air: http://www.waypoint.com/users/~discobay/section_7.htm
See you on PSK.
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WA7KPK
Member

Posts: 129




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« Reply #2 on: January 24, 2002, 10:28:23 PM »

Amazing how your mind gets into a rut . . . I hadn't even thought of just hooking the audio output to a speaker. Smiley

Thanks, and if all goes well I hope to be on PSK simetime in the next month or two. Right now I can listen but I can't talk back -- it's almost as frustrating as the days before I got my Novice.

73, Creede
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