[amsat-bb] KPC and IC910 help

Glenn Little glennmaillist at bellsouth.net
Tue Sep 2 02:15:45 UTC 2014

I do not have one of these radios so what follows is from the manual.

The first step in repairing the radio is to determine where the 
keying signal is originating from.
Is the radio really being keyed or is it only indicating it is keyed?

Check J1581 pin 3 to ground, this is the accessory connector.
Check J1561 pin 3 to ground, this is the DATA2 connector.
Is there a side tone when the radio keys?
Check J1 pin 5 to ground, this is the microphone connector.

These checks should determine what is causing the radio to be keyed.
If the radio is really being keyed, ensure that the power is turned 
to minimum on both VHF and UHF.
Also ensure both ports are terminated in a load that will dissipate the power.

Change the battery in the KPC9612+ and see if it still has a problem.

Let us know what you find.


At 02:46 PM 9/1/2014, Jim White wrote:
>Looking for a bit of help here.  In reassembling my 9600 bps ground 
>station today for an upcoming launch I found two problems.
>1) My IC910H goes into transmit on main band when I power it on, 
>even with nothing connected.  It worked fine a month ago.  Using the 
>4/5-power on factory reset clears the settings but it still 
>transmits when turned on.  I'd appreciate any ideas of what else I 
>can try, or - can I send it to ICOM for repair.
>2) A used KPC9612+ I bought from a local guy, which worked fine a 
>few days ago, now has a PTT problem.  The PTT on pin 1 of the 15 pin 
>'high speed' port 2 connector is inverted.  It is ground when the 
>TNC is idle and goes off ground (not sure how far) when I send a 
>packet. The PTT light for port two works properly, red when PTTing, 
>but the output pin is inverted.  I did note the backup battery 
>appears dead because settings like the PC interface baud rate don't 
>survive a power cycle, but I can't see how that should effect PTT 
>polarity.  As above, any ideas about a setting the inverted that, or 
>- where can I send this guy for repair, would be appreciated.
>These two could be related since the KPC and 910 were connected for 
>a month or so.  Perhaps one failure caused the other.  Just speculating.
>Thanks in advance,
>jim at coloradosatellite.com
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