John/etc To requalify- This is my capability! I use only the exciter IC-451 1-8W. I am acutely aware of the sensitivity of AO-7. However when attempting work footprint edge to footprint edge, I did run some power momentarily to find my down link. Yes John I have read all the available information regarding the history and operation of AO-7. I trust you will take the liberty to CC this email to the EU AMSAT reflector. I should have reread my initial post to the bb, as the context is not correct. My apologies to all for the justifyable outrage this has caused. I conciously make every effort to follow all the rules written and unwritten.
-- 73 Bob W7LRD AMSAT member 28498 Seattle
-------------- Original message -------------- From: john hackett [email protected]
For those that don't understand power budgets on satellites - especially ailing ones - *PLEASE* make the effort to read up on the subject - so you can honestly say "your" operating *DIDN'T* shorten a particular satellites life ... or ... you were *NOT* being an alligator ... (all mouth and no ears) ... and using more than your fair share of the available power.
Remember ... there are potentially many !! users on AO-7 and the available power is distributed among them ... a LINEAR transponder isd *NOT* like an FM transponder.
There is an excuse for simply "not knowing" - but there is no !! excuse for knowing and ignoring the facts - that's just plain anti-social.
If you're not aware of it, do please !!! take the time to read up on the subject.
73 John
From: [email protected] To: [email protected] CC: [email protected]; [email protected] Subject: Oh - my - God - (AO-7 uplink power). Date: Fri, 1 Feb 2008 09:41:04 +0100
Oh - my - God!,
On 70cm I run about 80-100 watts to a 40 el cp yagi. I can pick up my down link when the sat is about 7 degrees.
73 Bob W7LRD That's not an AO-7 station Bob, it's an EME station.
Did you not read the recommended operating proceedure for AO-7
5 watts or less to a decent aerial is adequate. Personally, I have *NEVER* used more than 5 watts to a homebrew 6 element yagi but this gave me 3rd place worldwide - (currently 5th) - when I was more active.
I have taken the liberty of CC'ing part of your mail to the EU amsat reflector because like me - they won't believe! the power you're using ... 100 watts to 40 elements is several kilowatts !! EIRP.
I would respectfully suggest you do some research about *WHY* one should maintain a reasonable power budget when operating satellites ... afterwards - (hopefully) - you'll see what I mean.
AO-7 is not in the best of health at at the best of times but hitting it with so much uplink power is most certainly not going to prolong it's life.
It is also thoroughly recommended to use a "receiver" with an aerial attached - though with your uplink power - (if it's true) - a wet shoelace ought to suffice.
NB.
You did say 40 elements ... did you mean 4 ???.
73 John. ................................................................................ ......
From: [email protected] To: [email protected] Date: Fri, 1 Feb 2008 03:58:29 +0000 Subject: [amsat-bb] antenna attenuation
Hello Has anyone encountered this situation- My satellite antennas are about 15
feet off the ground. approximatly 18 feet away at that height is the base of a 25 foot tripod that holds my HF quad. When aiming at a certain direction about 15-20 degrees I can't seem to get through to AO-7. I am trying to connect with OH8MBN. Other directions I can usually hear my downlink almost down to the horizon. On 70cm I run about 80-100 watts to a 40 el cp yagi. I can pick up my down link when the sat is about 7 degrees.
73 Bob W7LRD Seattle
-- "if this were easy, everyone would be doing it" _______________________________________________ Sent via [email protected]. 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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Express yourself instantly with MSN Messenger! Download today it's FREE! http://messenger.msn.click-url.com/go/onm00200471ave/direct/01/ _______________________________________________ Sent via [email protected]. 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
-- 73 Bob W7LRD AMSAT member 28498 Seattle
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