[amsat-bb] Re: FW: Oh - my - God - (AO-7 uplink power).
w7lrd at comcast.net
Fri Feb 1 13:01:09 PST 2008
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
-------------- Original message --------------
From: john hackett <la2qaa at hotmail.com>
> 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
> 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
> 73 John
> From: la2qaa at hotmail.com
> To: w7lrd at comcast.net
> CC: eu-amsat at yahoogroups.com; allan_gm1sxx at hotmail.com
> 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.
> You did say 40 elements ... did you mean 4 ???.
> 73 John.
> > From: w7lrd at comcast.net
> > To: AMSAT-BB at amsat.org
> > 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"
> > _______________________________________________
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> Sent via AMSAT-BB at amsat.org. Opinions expressed are those of the author.
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73 Bob W7LRD
AMSAT member 28498
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