[amsat-bb] IC-910H with SATPC32ISS

Sion Chow Q. C. (9W2QC) 9w2qc at 9w2qc.net
Tue Sep 27 11:08:28 PDT 2011

Dear All,

Previously we have been using the ICOM IC-910H transceiver with  
SATPC32ISS for doppler control for our ARISS school contacts.  Due to  
ISS has both its TX and RX frequencies in the 2M band, we had to use  
an extra wire between the IC-910H's ACC jack and the PC's COM port to  
inhibit frequency changes while the radio is transmitting.

Based on the "What's New" document of SATPC32ISS  
(http://www.dk1tb.de/What's%20New.txt), it is noted that the extra  
wire between IC-910H's ACC jack and the PC's COM port is no longer  
needed from version 12.8a onwards.  However, when we did a simulation  
of this, we notice that should the frequency changes (due to doppler  
shift) while the radio is in transmit mode, the TX and RX frequency  
swaps (TX frequency becomes RX while RX frequency becomes TX) - as  
what used to happen during previous version when the ACC wire is not  

I wonder if there are some configurations that we need to check?  Or  
is there something that we are doing wrong here?  The IC-910H is  
connected via a G4ZLP ICOM CI-V cable to the PC's build in COM port.

Any pointers or suggestions will be greatly appreciated.  Thank you.

Sion Chow Q. C.,
Also: WQ2C /HL1, 9V1QC, JG1XHM,
ex: 9W2QC, AB3IO

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