[amsat-bb] Re: Tuning

James Duffey JamesDuffey at comcast.net
Sat Apr 18 19:18:08 PDT 2009

Before the advent of computer Doppler tuning compensation, the  
convention was to tune the radio on the highest band as that is where  
the doppler is the largest and to leave the other one alone as much as  
possible. That is not a perfect solution as different stations in the  
footprint see different Doppler shifts and it is usually unavoidable  
to tweak both radios. But you can generally save yourself a lot of  
confusion by only tuning one radio, the highest one, whether it be  
receive or transmit.

If you are using a computer for tracking, it should also give you the  
doppler correction even if you are not controlling the radios with it  
and you should find your downlink without too much trouble. It is  
confusing at first, but after a while you get hte hang of it and it  
becomes second nature.

If you can catch AO-7 in Mode A, that is a good mode to practice  
Doppler compensation with as the doppler shifts are much lower. - Duffey

On Apr 18, 2009, at 12:07 PM, Jerry Felts wrote:

> I have made 2 contacts now both were  VO-52. Both times on SSB and  
> very
> confusing. So say I'm working you. I found a clear freq by sending  
> alot
> dots. The uplink tx is switched to LSB. Do I leave the tuning dial  
> on the
> uplink rig and just use the tuning dial on the downlink to do my  
> tuning? Or
> do I juggle both rigs tuning dial and get confused?
> Jerry - NR5A - South Dakota
> www.freewebs.com/nr5a
> http://groups.yahoo.com/group/Minimalist_QRP_Transceivers/
> http://www.cakewalkblogs.com/nr5asminimalradio/index.aspx
> http://nr5abeaconblog.blogspot.com/
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James Duffey
Cedar Crest NM

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