[amsat-bb] Re: How you do DOPPLER correction in Linear Transponders?

[n3tl@bellsouth.net]

Fabiano,

Are you using the Beta version of Ham Radio Deluxe - v 4.1, Build 1989? That is the version I have installed. In it, the bottom "slider" on the right side of the tuning bar will enable you to fine-tune the uplink and downlink. The top slider allows you to use HRD to tune up and down the passband, and the offset will not change.

I hope this is helpful.

Note to all - I tried tuning the downlink on FO-29 last night. It seemed awkward at first because I'd only been tuning the  uplink, regardless of whether it was the higher frequency. But literally after a minute or so, it was no problem. 

73 to all,

Tim
-------------- Original message from Fabiano Moser <fabianomoser at gmail.com>: -------------- 


> Dear friends, 
> Thank you very much for the answers, help me a lot and now I have better 
> idea how operators does. 
> Now I come back to other situation when I do doppler control automatic by 
> Hamradiodeluxe: 
> 
> Let make an example at VO-52 using middle of transponder. 
> While the software is doing correction in the two VFO´s when I start to TX 
> my signal are always above or below the frequency suggested by computer, and 
> I need to put OFF uplink adjust at HRD and do by manual to go higher or 
> lower in Uplink to listen my self. Okay I know the UHF doppler is higher 
> than VHF, but I presume that HRD always adjust the better adjustment for UP 
> and DOWN. 
> 
> At FM satellites this not happen 
> 
> This make me confused becuase if I have new kepler downloaded, why my audio 
> always comes above or below the downlink who Hamradiodeluxe adjust on my 
> FT-847. 
> 
> 73 
> Fabiano Moser CR7/PY5RX 
> ARISS-PORTUGAL (Amateur Radio on the International Space Station) 
> Representative at Teleconference and Portugal Telebridge Coordinator. 
> AMRAD/AMSAT-CT 
> http://www.amrad.pt/ariss.php 
> 
> 
> 2009/7/2 i8cvs 
> 
> > ----- Original Message ----- 
> > From: "Fabiano Moser" 
> > To: "amsat-bb" 
> > Sent: Thursday, July 02, 2009 6:19 PM 
> > Subject: [amsat-bb] How you do DOPPLER correction in Linear Transponders? 
> > 
> > 
> > Dear friends, 
> > 
> > We know that some Satellite Operators use diferent system to doppler 
> > control. 
> > 
> > For Linear Transponder 
> > 1) Adjust uplink and downlink automatic by CAT? (Not always woks, some 
> > times 
> > I´m up or down from the computer adjust) 
> > 2) Adjust uplink and downlink manual 
> > 3) Keep Uplink fixed and adjust only the Downlink frequency. 
> > 
> > What is the more indicate method to use? 
> > FT-847 have knob to adjust Uplink without change downlink VFO, and I´m 
> > using 
> > it to keep my voice in downlink at same downlink much I can. 
> > 
> > But I know some operators use fixed uplink. 
> > 
> > How you do? 
> > 
> > -- 
> > 
> > Hi Fabiano, CR7/PY5RX 
> > 
> > My preferred metod (from OSCAR-6 to AO40) is to adjust only the Uplink 
> > frequency in order to keep my voice in downlink as clear as possible 
> > exactly 
> > as you actually do manually. 
> > If the station in contact with me moves up or down I invite the operator to 
> > move the VFO of his TX to come again in my constant receiving frequency. 
> > 
> > 73" de 
> > i8CVS Domenico 
> > 
> > 
> > 
> > 
> > 
> 
> 
> -- 
> 73 
> Fabiano Moser CR7/PY5RX 
> ARISS-PORTUGAL (Amateur Radio on the International Space Station) 
> Representative at Teleconference and Portugal Telebridge Coordinator. 
> AMRAD/AMSAT-CT 
> http://www.amrad.pt/ariss.php 
> 
> "There is no great talent without great will. (Honoré de Balzac)" 
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