Hi Doug,
Here is the best article on the subject with an explanation
of why and what to do:
http://www.amsat.org/amsat/features/one_true_rule.html
Welcome to satellites!
73,
Tony AA2TX
AMSAT, VP Engineering
---
- Original Message -
From: Douglas Phelps
A rookie observation….
That article was written in 1994 —well prior to the state of the art in full
doppler correction. I use MacDoppler for adjusting the VFOs and it happily
adjusts both of them. The ONLY time I run into a problem where the received
station is moving is when it is clear
It's certainly the case that many people operate out in the field and do not
have a computer available.
My radios are not computer controlled, even in the shack.
On 09-Jun-11 11:08, Tom Schaefer, NY4I wrote:
Is the state of the art still such that we are all using radios that do not
support
Certainly desirable Tom, but I've been in Amsat and on the birds since the
'70s and it wasn't until the last couple of years that I got my PC hooked
to my FT-736R! And then just this year to get it hooked to my FT-817 (IF)
radio.
I will say that there's nothing better than PC doppler and rotator
I always varied the transmit.
This way the person I'm talking to as well as any other listeners are
all on the same freq listening.
Growing up on the birds when you had to twist the BIG knob to keep
everyone on freq is not not a big deal. And to this day i still don't
know why it seems to be
OK my brain may be playing tricks, but if you vary only your transmit
frequency such that you always hear yourself on the same downlink
frequency, isn't it true that the other station may not necessarily be
hearing you on the same downlink frequency and is chasing you anyway?
Your doppler is
doppler effects both paths, up and down.
so at least if everyone is listening to a 100Hz freq tone at 100 Hz, we
are all on the same freq.
Joe WB9SBD
The Original Rolling Ball Clock
Idle Tyme
Idle-Tyme.com
http://www.idle-tyme.com
On 6/9/2011 9:35 AM, n...@lavabit.com wrote:
OK my brain may
Jerry's correct. If you only adjust your transmit frequency, such
that your receive frequency appears to stay the same -- then you're
automatically correcting for your own downlink doppler, but not for
anyone elses. Other hams in the footprint will still have to chase
you. The only way to stick
Hi!
That being said, adjusting the higher (UHF) transmit frequency on
VO-52 and AO-07 only (ie. manual control) will get you pretty close,
and you won't drift a whole lot. I hear plenty of hams doing this, as
long as there are just one or a two QSO's going on, they don't drift
into each
This is a great thread.
Well, I am going to continue with full doppler and just resolve myself to
tuning in some people that are not quite there yet. As a lot, I would think
adding computer control to handle full doppler would not be that big a deal
nowadays as most of the programs support it.
At 01:01 PM 6/9/2011, you wrote:
Actually, if stations would spread out a bit more on the transponders,
this would be even less of an issue.
There is so much space that goes
to waste on these transponders, when everyone seems to never go
more than a few kHz up or down from the center.
True.
At 04:06 AM 6/10/2011, Tom Schaefer, NY4I wrote:
This is a great thread.
Well, I am going to continue with full doppler and just resolve
myself to tuning in some people that are not quite there yet. As a
lot, I would think adding computer control to handle full doppler
would not be that big a
So for the operator with a single FT-817ND - understanding there will be a
learning curve in regards to doppler, doing the Arrow wave entertaining
and/or frightening the neighbors, is AO-7 do-able or just not a really
good idea?
Won't be ticked off if the answer is probably best not to try.
snip
So for the operator with a single
FT-817ND - understanding there will be a
learning curve in regards to doppler, doing the Arrow
wave entertaining
and/or frightening the neighbors, is AO-7 do-able or just
not a really
good idea?
Won't be ticked off if the answer is probably
At 10:59 AM 6/9/2011, Douglas Phelps wrote:
If you do not have a sat program automatically correcting you rig frequency,
what is the most common or preffered technique? 1 - Hold the TX
steady and adj
the RX for doppler or 2- Hold the RX steady and adjust the TX for doppler? I
know this must be
I am new to the satellites. Got to where I can hear my downlink if the
bird is
higher than 15 degrees. My question is about handling the doppler shift.
If you do not have a sat program automatically correcting you rig
frequency,
what is the most common or preffered technique? 1 - Hold
Hi Doug, KA9DLP
Hold the RX steady and adjust the TX for doppler.This is what I did
manually from OSCAR-6 and I do actually on VO-52, FO-29 and
OSCAR-7
73 de
i8CVS Domenico
- Original Message -
From: Douglas Phelps dphel...@ameritech.net
To: amsat-bb@amsat.org
Sent: Thursday, June 09,
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