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


Hi Rick.

Just athought... Did you say in an earlier post that you are using an Arrow?
And if so are you using the 'strongarm' rotator method or something more

If you're using an Arrow and strongarm method, I get armchair copy on FO20
across the sky with anything from 10 to 50W, mostly 10W. But of course you
have to rotate it on its axis as it passes to get the best signal depending
upon the polarization mismatch. Health warning: Beware operating high power
with the strongarm method!

FWIW I'm putting two Arrows together to make a 3x3 and 7x7 pair with
circular polarization at the moment, with the intention of trying it as a
nice small semi-permanent installation. This should avoid (in theory!)
having to rotate it on its axis. Struggling to get the SWR down with the
power splitter/polarization switcher at the moment, but hopefully I'll be in
business soon.

If you're using a ground plane with a bit of gain, the sort of problem
you're encountering is similar to what I achieve at home (Diamond 2000).
Nice strong sigs near the horizon, but quite difficult at much over 20

Or maybe you're using a different antenna...

73 Howard G6LVB

----- Original Message -----
From: "Rick Allnutt" <ws8g@hotmail.com>
To: <amsat-bb@AMSAT.Org>
Sent: Tuesday, June 20, 2000 6:26 PM

> bbs,
> I am one inexperienced newbie on the satellites.  I am just trying to
> how to use them and need some advice from the gray-hairs.
> As I have related, I first used the FM satellites with a 3 watt handheld,
> and was able to make nice contacts when I slipped a word or two in-between
> guys that might be using a bit more.  When I bought my FT-847, I admit
> I pushed more like 10 watts into the antenna, and (shame on me) it made it
> lot easier to be heard.  Fewer of the stations stepped on top of me.  I
> my 2-3 contacts in and left the rest of the pass to others.
> That is mostly in the past, because I am mainly interested in the analog
> birds right now.  Because I am used to using about 50 W on HF, and the
> signals from the FO birds sound weak, I have been using 50 W on FO-20 and
> FO-29.  Funny thing, my signal sounds nice and clear when the bird is a
> thousand miles away on the horizon, but it sounds terrible when above 30
> degrees elevation (and is a lot closer.)
> This puzzled me.  Then I think I began to understand.  I believe (but have
> not yet tested it by dropping to 5 watts or so when the bird is well above
> the horizon) that I may be overdriving the receiver on the bird and it can
> not send me a reasonable signal back.  I hear myself, but the signal is
> clipped and sounds like I have not found the right receiving frequency.
> there seems not to be ANY right recieving frequency.
> If I am overdriving the bird and disrupting my received signal, I may have
> been causing the other ops in the pass band to have degraded received
> signals as well. If I am at fault for disrupting your conversation over
> last week or so, I appologize.
> Maybe some of the fades we hear on the bird are not due to rotation and
> phase change.  Maybe some of them could be due to inexperienced ops like
> myself.
> Mea Culpa.  I will change my operating to much lower powers.
> 73s
> WS8G (Rick)
> (ws8g@amsat.org)
> ________________________________________________________________________
> Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com
> ----
> Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
> To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org

Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org