[Date Prev][Date Next][Thread Prev][Thread Next] - [Date Index][Thread Index][Author Index]

Re: Tuning conundrum

Food for thought.........
Whatever you do is wrong, at least in somebody's mind. Lets take a common
sense approach and I am just talking to the QSO that happens to be on X
satellite......... If you change the uplink frequency regardless if high
or low you also changing the poor fellows receive on the other end. Fun,
isn't it ???. Now to the pro it does not matter much, he can follow
without loosing too much of the QSO. But the hapless "newbie" who has a
hard enough time to figure out what is going on, really gets messed up.
So, as far as I am concerned I WILL ADJUST MY RECEIVE ONLY. And most of
the world is doing the same. They can not all be wrong. Now, I have
queried AMSAT about 18 month ago to find out what the proper procedure is
in that regard and was told THERE IS NONE AT THIS TIME. Anyway regardless
of how you slice the apple, use common sense. Most satellites are so
underused that little bit of drift does not matter most of the time. 73
and MERRY CHRISTMAS to all of you. MELE KALIKIMAKA as we say here on the
Islands. Peter, NH6VB. AMSAT area coordinator, Hawaii.

On Thu, 16 Dec 1999 13:35:13 -0800 "Peter A. Klein" <pklein@2alpha.net>
>At 06:11 AM 12/16/1999 -0600, you wrote:
>>But in the absence of a computer tuning on both sides, please people, 
>>let's do what all the books say: TUNE THE HIGHER OF THE TWO 
>>regardless of whether its uplink or downlink.
>In general, I agree, and this is what I try to do.  But here's a 
>situation where this rule can't quite be followed slavishly.  
>What happens when working "split mode?"  Say we're on RS-13.  Operator 
>is using Mode A (144 up, 29 down), and Operator #2 is using Mode K (21 
>29 down).  I think that in this situation, Op #2 might do better to 
>his 21 MHz uplink, even though it's lower. That way he won't 
>undo Op #1's tuning of 144 MHz.  
>Fortunately 21 MHz doesn't Doppler shift so much. But if you follow 
>"tune highest frequency" rule, there will be a bit of jumping about, 
>someone will end up having to tune both frequencies.
>I suspect we'll run into this more on P3D when multiple transponders 
>turned on.  And they probably will, for backward compatibility with 
>Phase III operators. Not everyone will invest in microwave 
>until after P3D is up and the transponders are actually working. 
>Consider the combination of old Mode B (435 up, 144 down) with Mode 
>(1.2 gigs up, 2.4 gigs down).  Or even worse, suppose both operators
>transmit on 435 MHz, but one receives on 144 MHz and the other 
>receives on
>2.4 gigs.  
>I suspect in such situations, we may develop a convention that one 
>will adjust uplink while transmitting and downlink while receiving.  
>Or, we
>will develop a universal rig control package for constant frequency at 
>satellite, and have always-perfect keps.  :-)
>73 from KD7MW
>--- Peter
>/\:     ________     __     =========     ,  ,  ,  ,   ,  ,  |'  ,     
> ,
> / b   |  |  |  |   |  |   |  |   |  |   |  |  |  |   |  |   |  |  ~|' 
>/ b b ,| ,| ,| ,|  ,| ,|  '  ,|   | ,|   |__|__|__|   |__|   |  |   |  
>                                ~'                            
>Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
>To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org

Why pay more to get Web access?
Try Juno for FREE -- then it's just $9.95/month if you act NOW!
Get your free software today: http://dl.www.juno.com/dynoget/tagj.
Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org