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

Tom Schaefer, NY4I ny4i at arrl.net
Mon Jul 25 10:48:07 PDT 2011

One of the things I like most about MacDoppler is that I can turn the VFO and it will follow me. It does not enforce that I use the program to change frequencies. That allows one to use a simple VFO know interface to change frequencies while still having full Doppler correction.

I have tried every Sat program I have been able to find (PC and Mac) and it is the nicest interface so far. To me, it is worth the $500 to get a MacMini just for this program (although I have 6 macs in the house so that was not necessary).

It just clicked why most guys are around the middle of the passband if they are using computer control. If the programs put them in the middle, that is where they stay. :)

I have also experienced the issue where I am doing full correction and guys that are not doing correction move into my receiver's passband. Nothing that spinning the dial will not fix but it is funny to hear.

Lastly, a heartfelt thanks to all of you for your input. This has been invaluable. It lets me know that there is hope and I am not going against the grain by trying to use full Doppler. It was also nice seeing many of the calls that I have worked in the last few months. I'm getting my Gulf-Alpha beam up in the next couple of weeks so it should even get better. Thanks for you patience and guidance.



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

On Jul 25, 2011, at 1:29 PM, Patrick STODDARD (WD9EWK/VA7EWK) wrote:

> Hi Alan!
> I wanted to make a couple of points regarding some of your comments
> from your earlier post...
>> There was an article in the Journal a few issues back on why the various
>> manual techniques are only approximations, sometimes surprisingly bad ones.
>> I think the author's call was WA4SCA.
> Yes, that WA4SCA is a good guy, smart guy.  ;-)
>>  So it does get talked about. With an
>> accurate clock, and current Keps it is possible to work a full pass and
>> scarcely touch the dial.
> I think some forget that even with computer control, you *can* touch
> the big tuning knob on your receiver to see what may be away from
> the center of the 50 to 100 kHz passbands.  If you don't want to
> touch your radio(s), then use the software to tune your receiver
> around the passband.  Everyone can't work in the few kHz around
> the center of the passbands and have multiple simultaneous QSOs.
> It has been nice to see more SSB activity on the weekends.  On the
> past couple of Saturday mornings, I've heard SSB QSOs on VO-52
> from around 145.900 MHz up to almost 145.920 MHz.  Not as busy
> as Field Day, but you won't be out there all alone - and still have
> room for additional QSOs.  FO-29 and AO-7 (mode B) have also
> had more activity on recent passes I've worked.
>> My default is for full Doppler correction.  If the other station is using
>> it, fine.  We can concentrate on communicating.  If not, I switch off and do
>> it the traditional way.
> You don't necessarily need a computer to concentrate on
> communicating through the linear transponders.  Computers are
> very useful, but not mandatory.  I encourage computer control for
> those looking to try the SSB birds, especially with software like
> SatPC32.  It will take some time to get the software working
> properly with your radio(s), so be prepared to work with your
> radio/computer combination.  Otherwise, it will take time to get
> the hang of working them "old school", without the assistance of
> a computer.  It took me 6 to 8 months, including trying different
> antennas and radios receiving the downlinks, before settling on
> my current SSB satellite station configuration.  Definitely not
> "EasySats", like the FM birds are called, but not impossible to
> work.
> 73!
> Patrick WD9EWK/VA7EWK
> http://www.wd9ewk.net/
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