[amsat-bb] Re: Question about tuning for doppler and SatPC32

ehekman@cox.net ehekman at cox.net
Mon Nov 20 13:40:47 PST 2006

I have found it much easier to maintain QSOs when both stations use computer controlled Doppler correction on both links.  The downlink frequency errors are easily tracked with the receiver RIT control.  

It seems to me that the best practice out of courtesy to others is to always use Doppler correction on the uplink.  If that is done then the uplink and downlinks frequencies stay nearly constant at the satellite and the receiving station can follow the signal with computer control and very minor RIT adjustments.  If uplink Doppler correction is not used then receiving stations must manually track the downlink frequency.

Since I have found it easy to implement and it makes QSOs much easier to maintain I am curious why computer controlled Doppler correction is not used by all stations.  Are there some radios still in use that do not have the capability for computer control?


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