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CX2SA > SATDIG 25.07.11 21:06l 292 Lines 10951 Bytes #999 (0) @ WW
BID : AMSATBB6394
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Subj: AMSAT-BB-digest V6 394
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Sent: 110725/1905Z @:CX2SA.LAV.URY.SA #:18378 [Minas] FBB7.00e $:AMSATBB6394
From: CX2SA@CX2SA.LAV.URY.SA
To : SATDIG@WW
Today's Topics:
1. Re: Should I abandon full Doppler correction? (Tom Schaefer, NY4I)
2. Re: Should I abandon full doppler correction? (D. Craig Fox)
3. ISS Views STS-135 Re-entry (Clint Bradford)
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Message: 1
Date: Mon, 25 Jul 2011 13:48:07 -0400
From: "Tom Schaefer, NY4I" <ny4i@xxxx.xxx>
Subject: [amsat-bb] Re: Should I abandon full Doppler correction?
To: amsat-bb@xxxxxx.xxx
Cc: amsat-bb@xxxxx.xxx
Message-ID: <9290B270-B578-4E2E-A07B-83CBB0547014@xxxx.xxx>
Content-Type: text/plain; charset=iso-8859-1
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.
73,
Tom
Tom Schaefer, NY4I
ny4i@xxxx.xxx
EL88pb
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/
>
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. 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
------------------------------
Message: 2
Date: Mon, 25 Jul 2011 11:09:53 -0700
From: "D. Craig Fox" <DFox@xxxxxx.xxx>
Subject: [amsat-bb] Re: Should I abandon full doppler correction?
To: Amsat BB <amsat-bb@xxxxx.xxx>
Message-ID:
<3D18A6B1AAE35841854398A9AA36CDC80340C55F2B@xxxxxxxxxx.xxx.xxx>
Content-Type: text/plain; charset="us-ascii"
When I bought my TS2000 several years ago I too played "chase the downlink"
for about a week and did a fair job. But if it was annoying to me to have
to do that, I knew how annoying it must have been to other, Doppler
controlled stations chasing me. I am not a computer whiz by any means, but
my frustration, and desire to avoid the 2 meter repeater characteristics of
the FM birds and favor quality QSOs on the linear birds drove me to download
and set up SATPC32. After a bit of study on how the CAT control works, I
had it dialed in. This took place over about a 3 day period. Since my first
full Doppler controlled QSO, I have never ever gone back to manual tuning-
although some small adjustments are often required on real high passes.
As someone said earlier, it makes lengthy roundtable QSOs possible and is a
kick watching everyone's freqs move with yours as you watch the satellite
light up each station's QTH.
Another satisfied customer (and regular on VO52, AO7 and FO29- thanks and
with regards to Erich DK1TB)
Craig
N6RSX
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of Michael Schulz
Sent: Sunday, July 24, 2011 3:34 PM
To: Tom Schaefer, NY4I
Cc: Amsat BB
Subject: [amsat-bb] Re: Should I abandon full doppler correction?
Tom,
I tried full doppler control with HRD's sat tracking software and wasn't
really thrilled to say the least. I may again try
Macdoppler as it's so far the best sat program I've seen but my main shack
machine unfortunately is a Windows box
because HRD's logging software is more convenient than MacloggerDX with
regards to eQSL and LOTW.
The other reason I do it all manual (both doppler and rotor control) is that
I like to be in control :). If I would leave it all
to the computer and all I'd have to do would be press the PTT then where's
the fun in that? IMHO it's great building all
the computer control as a PoT but then when it works it becomes boring :).
I heard you loud and clear on FO-29 today.
73 Mike K5TRI
On Jul 24, 2011, at 4:17 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@xxxx.xxx
> EL88pb
> Monitoring EchoLink node KJ4FEC-L 489389
> DSTAR Capable APRS: NY4I-15
>
>
>
>
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. 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
_______________________________________________
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------------------------------
Message: 3
Date: Mon, 25 Jul 2011 11:27:28 -0700
From: Clint Bradford <clintbradford@xxx.xxx>
Subject: [amsat-bb] ISS Views STS-135 Re-entry
To: AMSAT BB <amsat-bb@xxxxx.xxx>
Message-ID: <1BF85B70-9471-4FC4-9302-D11E8AA63A12@xxx.xxx>
Content-Type: text/plain; CHARSET=US-ASCII
NASA PHOTO -
http://www.nasa.gov/images/content/573236main_iss028e018218_full.jpg
Station Crew Views Shuttle Landing
This unprecedented view of the space shuttle Atlantis, appearing like a bean
sprout
against clouds and city lights, on its way home, was photographed by the
Expedition
28 crew of the International Space Station. Airglow over Earth can be seen
in the
background.
Image Credit: NASA
I have run out of monitors for all these incredible "screensaver/wallpaper"
NASA photos ...
Clint Bradford, K6LCS
------------------------------
_______________________________________________
Sent via amsat-bb@xxxxx.xxx. Opinions expressed are those of the author.
Not an AMSAT member? Join now to support the amateur satellite program!
http://amsat.org/mailman/listinfo/amsat-bb
End of AMSAT-BB Digest, Vol 6, Issue 394
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