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eHam Forums => Computers And Software => Topic started by: KD4SBY on March 08, 2012, 07:20:25 AM



Title: Homebrew CI V interface not working?
Post by: KD4SBY 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. ???
Is there any way I can test with the computer or the 718 if the interface is working properly? Any comments?


Title: RE: Homebrew CI V interface not working?
Post by: AA6YQ 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. ???
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


Title: RE: Homebrew CI V interface not working?
Post by: KD4SBY on March 18, 2012, 10:35:28 AM
Dave,
I have -9V on the RTS pin. (Should that not be a + voltage?)


Title: RE: Homebrew CI V interface not working?
Post by: KD4SBY 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.