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Author Topic: Homebrew CI V interface not working?  (Read 1553 times)
KD4SBY
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Posts: 223




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« on: March 08, 2012, 07:20:25 AM »

I build the CI V interface from the circuit published by QST in 7/92 by KG7SG to use it with my IC-718  and it does not seem to work with HRD. I can not get any readings from my 718. Huh
Is there any way I can test with the computer or the 718 if the interface is working properly? Any comments?
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AA6YQ
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« Reply #1 on: March 08, 2012, 10:38:09 PM »

I build the CI V interface from the circuit published by QST in 7/92 by KG7SG to use it with my IC-718  and it does not seem to work with HRD. I can not get any readings from my 718. Huh
Is there any way I can test with the computer or the 718 if the interface is working properly? Any comments?

Do you have a volt-meter or oscilloscope you can use to verify that the circuit is receiving power from whichever modem control signal (RTS or DTR) you're using as a power supply?

     73,

          Dave, AA6YQ
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KD4SBY
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« Reply #2 on: March 18, 2012, 10:35:28 AM »

Dave,
I have -9V on the RTS pin. (Should that not be a + voltage?)
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KD4SBY
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« Reply #3 on: March 18, 2012, 10:55:08 AM »

UPDATE - The voltage goes from -9V to +3V when HRD is connecting.
It is not reading the frequency after three tries.
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