Re: [amsat-bb] AO-40 70cm antenna side lobes?

[Scott Townley <nx7u@xxxxxxxxxxxxxx>]

Wow, my name in actual print....kind of.
Greg, FWIW:
I could hear myself very well as well.  For reference:
	Uplink 9el v-pol yagi with about 40W delivered to antenna.  Don't
recall what I was running at the time but it wasn't full tilt.  U-band,
no L just yet.
	Downlink 2' solid dish, 2-1/4 turn helix feed, DEMI d/c.
Don't know if you tried calling in CW...as I mentioned on the air, I
could just barely barely make out that someone was calling.  But several
CW tuning swishes were very loud; don't know if you were one of them.
So...if you were one of them, perhaps your audio levels are way
down/undermodulated?
The squint wasn't too awful, around 12-15 degrees or so?  I would think
the U-band antenna would be significantly lower gain/higher beamwidth
such that squint wouldn't affect it as much.


"Greg D." wrote:
> 
> Hi folks,
> 
> We've talked about the side lobes on the S2 antenna, where there is
> significant energy squirting out at around 30 degrees.  I'm hearing
> the beacon right now pretty well with a squint angle in the
> neighborhood of 26 degrees.  MA is 209.
> 
> But, I can barely get into the bird with 100 watts CW to 2x8 element
> beam on 70cm.  Heard NX7U very clearly calling CQ, but couldn't get
> back to him.  If you're reading this, nice signal!  I tried...
> 
> I know that the off-pointed patterns of the various antennas are
> different.  I'm guessing that the L band antenna has a lobe around
> this angle, and the U band doesn't, and NX7U must have been on L.
> 
> Is there any other angle, other than 0/0, where the side lobes of the
> S2 Tx and 70cm Rx antennas line up?  I'd like to know when I have a
> chance to get in.  Also, perhaps we could use them during the
> upcoming hibernation period.
> 
> 73s,
> 
> Greg  KO6TH
> 
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