ICOM 740 on psk31??? help needed - Digital Forum at eHam.net

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eHam.net Forum : Digital : ICOM 740 on psk31??? help needed

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ICOM 740 on psk31??? help needed	Reply
by KK7XT on December 13, 2008	Mail this to a friend!
I have an old icom 740 and would like to use it on psk31. I know that care has to be taken in selecting an interface since the mic circuit is unique and can be burned out if the wrong interface is used. Has anyone here put an ic740 on psk31 and if so did you use a rigblaster or some other type of interface. If you have what interface model did you use and were there any mods needed to connect it to the icom rig? KK7XT Bill Cunnane kk7xt@yahoo.com or phone# 406 293 4280

RE: ICOM 740 on psk31??? help needed	Reply
by K5PHW on December 13, 2008	Mail this to a friend!
I don't have the Icom but a Rigblaster will work with darn near anything. I use the nomic version. It is jumper selectable for whatever you want to hook it to. Hope this is helpful. Clyde 73

RE: ICOM 740 on psk31??? help needed	Reply
by VA7CPC on December 13, 2008	Mail this to a friend!
One hint is here on the Heil Sound site: http://www.heilsound.com/amateur/products/hc104/index.htm It says that you need a blocking capacitor between the IC-740 mic input, and the coupling transformer of your soundcard interface. At 300 Hz, a 10 ufd capacitor has an impedance of about 50 ohms. That should give you a wide-enough AF passband. So I'd try a 10 ufd, 20 volt electrolytic capacitor, in series with the "hot" mic input, "+" side of the capacitor toward the rig. Have you asked the RigBlaster makers (or any other soundcard manufacturer) about the problem? Charles

RE: ICOM 740 on psk31??? help needed	Reply
by KT4WO on May 9, 2009	Mail this to a friend!
Had my 740 on digi modes for sometime. Picked up audio from ACC on back and feed audio in to the MIC port. Just dont OVERDRIVE..I used a homebrew interface. It is VERY easy to overdrive the MIC input, so use care and it will work fine. KT4WO

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