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Author Topic: Computer to rig interface question  (Read 401 times)
KU4UV
Member

Posts: 375




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« on: November 23, 2007, 08:42:08 PM »

I don't know if this is the correct forum for this question, so excuse me if it isn't.  I have a question about adding a microphone connector to a interface cable that I constructed from plans I found on the Internet.  I have an interface that I built a couple of years ago that uses a Radio Shack isolation transformer to seperate the transceiver from the computer.  One end of the interface connects to the soundcard output of the computer.  The other connection plugs into the microphone connector on the front of the radio.  I use this interface for digital modes such as PSK31 and RTTY.  I have a TS-130SE transceiver, and I use the transceiver's VOX circuit to key the rig.  
     What I am wanting to do is simply add a 4-pin mic connector to this interface so that I can also use my microphone without having to unplug the interfacfe cable.  I am wondering if it is o.k. to just go ahead and wire up a 4-pin mic connector to the female connector that plugs into the transceiver, and then just plug my mic into this connector without it having any problems?  This is similar to what the Rigblaster interaces have, in that there is a microphone connection on the front of the interface, and then a microphone output connector that plugs directly into the transceiver.  It seems to me that thiswould fine, but I thought I should check first.  Can anyone give me any tips or advise as to whether it is o.k. to do this?  I have so far not had any issues with RF getting back into the laptop, but then I only run about 30 Watts on the digital modes, and never more than 100 Watts.  I have a voice keyer program that I am wanting to use, and I want to be able to use my microphone also for anser any CQ replies.  Thanks for the help!

Michael KU4UV
ku4uv@arrl.net
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W5CPT
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Posts: 556




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« Reply #1 on: December 01, 2007, 09:06:35 AM »

The big down-side to doing what you suggest is that when you are PSKing the mike is on while the software is keying the radio. This will distort and ruin the audio signal as you TX the digital signal. Even in the quietest room you can imagine there is enough noise to make your signal totally un-copyable. Either build the interface to input the audio to the rear input connector on the rig (be carefull as not all radios mute the mike when using this input) or build a switch box that selects either the mike OR the interface to feed the front panel connector.

Clint - W5CPT
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SV1ENS
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Posts: 124


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« Reply #2 on: December 26, 2007, 02:53:13 AM »

Hi,
I've built my own interface with multiple in/outputs including different mic inputs...

What you need to do is make sure the microphone is turned off somehow when not in use, I use a switch, as not all rigs turn the mic off for digi...

Merry Christmas
SV1ENS
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KA1DBE
Member

Posts: 121




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« Reply #3 on: December 26, 2007, 07:52:09 AM »

I would just use a DPDT switch to switch over the audio line and the PTT line.  My interface is homebrew and my grounds are common.  Good luck!
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