I have seen it work with Sat PC 32 on VO52 Arm chair copy just move the
antenna once in a while. This was out doors, using a small ACER computer and
arrow antenna.
I would like to try it on my ICom 720, but the data port does not work just
like everything else that is satellite related to that
See
http://www.southgatearc.org/news/june2010/unitec1_in_new_scientist.htm
73 Trevor M5AKA
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It's time for another College Satellite night! We hope to see you on the
birds Thursday evening June 3rd from 22:00 UTC to 0500 UTC (June 4).
College Satellite nights are a monthly event held the first Thursday of the
month. Mark your calendar and spread the word to college hams/club stations
Greg,
Thanks for this reply. It's nice to know that even the highest of
currently-in-use satellite frequencies are do-able without computer aid. I'm
pleased to hear that, and will rethink my position on things above 70 cm.
To Joe and Bruce - Here, I have noticed particular challenges with
Folks I've been patiently silent reading this déjà vu annual discussion and
I'm getting a brain crap.
- comments that tuning the highest frequency is the One True Method
Yikes! Why is that? So you can leap frog down the pass band and eventually
stomp all over a QSO where folks are tuning both TX
Joe,
I have used both manual tuning over the years and automated Doppler tuning
since last year using SatPC. As Tim N3TL mentioned, I was on a recent
Dxpedition working portable satellite from KH6 using an FT857D for transmit and
an FT817 for receive. I used the automated tracking on the
Hi Alan,
Your comments suggest that I'm the one in Bizarro World.
Regarding the One True Rule - I operate under the impression (which, I thought,
has been backed by science) that regardless of the frequency pair, Doppler
always will have a more pronounced effect (in relative terms, of course,
Thanks to everyone that responded.
For those that have been on the list for years this thread may be a dull rerun,
but as a newbie, the information is useful.
From everyones responses, it appears that indeed there are currently two
conventions:
1. Full Doppler CAT tuning
2. Manually tuning the
This thread is cyclic but it is ok to be revisited time to time.
excerpt:
My suggestion is to use full tuning until you find that the other operator
isn't. Then adapt, usually by turning off the updating for the lower
frequency. It isn't worth getting doctrinaire about it. However, by
May 31st 2010
Organization update for post of President and Vice President.
An emergency committe meeting was held on May 26th 2010 at the residence of
VU2RMS, Ramesh as we had recieved request from the current president Air
commodore Suby, VU2UV to relieve him from the post of the president
... Doppler always will have a more pronounced effect (in relative terms, of
course, based on the frequencies being used) on the higher of the two ...
Here's the actual equation for determining Doppler shift ...
http://tinyurl.com/calc-dopp
Your generalization is correct. On a 45 degree pass
Congratulations to everyone. Well done!
73,
Tim - N3TL
From: Bruce kk...@amsat.org
To: amsat-bb@AMSAT.Org amsat-bb@amsat.org
Sent: Tue, June 1, 2010 11:32:43 AM
Subject: [amsat-bb] AMSAT Awards
The following have entered into the Satellite Communicators Club
John,
I meant to mention a nice page discussing Doppler shift. It explains many
of the questions/comments/rants brought up about Doppler shifts and
corrections:
http://www.qsl.net/vk3jed/doppler.html
It gives a few graphic illustrations of how Doppler shift varies depending
on the pass, and
Clint,
Thank you for this. Please note that I got a broken link window when I tried
to go to that page.
73,
Tim - N3TL
From: Clint Bradford clintbra...@earthlink.net
To: amsat-bb@amsat.org
Sent: Tue, June 1, 2010 12:49:35 PM
Subject: [amsat-bb] Doppler
Just a quick comment on Doppler effects. Doppler
offset from the resting frequency is observable
only on the radial velocity component of the
satellite and that is usually most significant at
AOS or LOS. BUT what the operator is usually
responding is to the rate of change of Doppler
and
Please note that I got a broken link window when I tried to go to that
page.
You have your browser set to protect you from too many re-directions. Or
maybe I messed up.
You can grab a copy on the DOCS page at ...
http://web.me.com/clintbradford/k6lcs/Home.html
It is the third or fourth
In a perfect world, everyone would be using full doppler control via
computer. As we can see from this discussion, it's not a perfect world.
During the time that I had the equipment to operate the linear birds I
found hooking up in a QSO with another station who was using full
doppler tuning
http://www.bclocalnews.com/entertainment/95263604.html
73 Trevor M5AKA
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Sent via amsat...@amsat.org. Opinions expressed are those of the author.
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At 11:31 PM 6/1/2010, Alan wrote:
I've read the Doppler tends to move more quickly near mid-pass than the
computer and software routinely seem able to keep up. Mid pass is when the
sat is moving most tangentially to you at which point Doppler shift is nil.
The rate of change of Doppler shift
At 04:45 AM 6/2/2010, Alan P. Biddle wrote:
John,
I meant to mention a nice page discussing Doppler shift. It explains many
of the questions/comments/rants brought up about Doppler shifts and
corrections:
http://www.qsl.net/vk3jed/doppler.html
Please use the official version
At 05:53 AM 6/2/2010, Michael Tondee wrote:
was fun. Not so if I came upon a station who was using manual tuning
while I was trying to let my computer do the work. I had to chase him
all over the passband and often lost stations completely that way. I
didn't fare much better with manual tuning. I
I have added the following items to the AMSAT online store.
2010 Red Ball Cap
2010 Orange ARISSat-1 Tee Shirt
2010 Tan AMSAT Golf Shirt
2010 Getting Started with Amateur Satellites
AMSAT - The First Forty Years
2010 Laminated Frequency Guide
If you are interested in any of the limited supply
ZW8B team was in the 2304 pass today on AO7
Great signal at 1 degree here :-)
GL to all in the next days
Sincerely Al XE2AT
_
Enciende tu hotness con Hotmail
At 01:18 PM 6/2/2010, Greg D. wrote:
One problem with the Yaesu 736R is that when the rig is under
computer control you can't grab the tuning knob and hunt around the
passband for someone to talk to. Tuning directed by computer is
agonizingly slow and tedious, taking about a second per
Date: Wed, 2 Jun 2010 07:36:40 +1000
To: mat...@netcommander.com; amsat-bb@amsat.org
From: vk3...@gmail.com
Subject: [amsat-bb] Re: Doppler Tuning Convention Question (summary)
At 05:53 AM 6/2/2010, Michael Tondee wrote:
When I can finally afford the V/U unit for my new Flex and
That does make things a pain. It's a pity that the radio can't talk
back to the computer, which would have been a nice addition.
The true pity is that the rig IS physically capable of talking to the computer,
but the only thing it knows how to say is what the status of the Squelch is
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