[amsat-bb] Should I abandon full doppler correction?

Tom Schaefer, NY4I ny4i at arrl.net
Sun Jul 24 14:17:14 PDT 2011

Hi all,

I just tried a nice pass on FO-29. I heard K9CIS on CW and W5BK from Texas. In both cases, while I am using full doppler correction with my 9100 and MacDoppler, I suspect they are leaving the transmit frequency fixed as they both changed frequency. K9CIS on CW was quite extreme in the Doppler shift. I know that this is a by-product of me using full doppler to listen to stations that are not, but it seems that the majority of the stations I hear are NOT using flu doppler. I have asked this question before, but it seems to be happening more frequently.

Should I abandon full doppler correction? Another less black-and-white step is that if I hear a station moving to adjust my settings so I am not doing full doppler. 

Has anyone ever taken a survey to see how many satellite users actually use full doppler. Am I assuming more guys use computers and anyone of the multiple ways to do computer control that have ben available for years? Does anyone ever talk about this in AMSAT circles? Sort of like the encouragement one gives to people afraid of LOTW to try it? "Computers in the shack…NEVER!" I exaggerate but it seems that way. Then again, being a computer person and having computer capable rigs I realize I am skewed in my expectations. I know there are guys working with old 271/471 pairs or even the old FT726 out there. Great radios and a simple way to do it, but even they have ways to do full doppler control and they have been out for 20 years. 


Tom Schaefer, NY4I
ny4i at arrl.net
Monitoring EchoLink node KJ4FEC-L 489389
DSTAR Capable  APRS: NY4I-15

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