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

Jim Sanford wb4gcs at wb4gcs.org
Sun Jul 24 14:51:13 PDT 2011


For what it's worth, I think I prefer the manual doppler correction on 
the highest frequency, which can be done manually.
Full doppler essentially requires constant computer control of both tx & 
rx frequencies, AND a whole lot of accurate data.

I've had similar experiences at Field Day, and was able to pick out the 
guys doing full doppler, and rarely able to work them.

For whatever my opinion is worth....
wb4gcs at amsat.org

On 7/24/2011 5:17 PM, Tom Schaefer, NY4I wrote:
> 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.
> Thanks,
> Tom
> Tom Schaefer, NY4I
> ny4i at arrl.net
> EL88pb
> Monitoring EchoLink node KJ4FEC-L 489389
> DSTAR Capable  APRS: NY4I-15
> _______________________________________________
> Sent via AMSAT-BB at amsat.org. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb

More information about the AMSAT-BB mailing list