[amsat-bb] Re: XW-1 FM

George Henry ka3hsw at att.net
Sat Dec 26 10:59:28 PST 2009

I think that the whole problem is the sheer number of stations trying to get 
into the bird at the same time...  destructive interference occurs between 
all the differently-phased PL tones, and NO ONE gets in most of the time.

I would love to see how much easier it would be to use with the tone turned 
off.  Either that, or leave it in linear mode all the time.........

George, KA3HSW

----- Original Message -----
From: "Alan P. Biddle" <APBIDDLE at UNITED.NET>
To: "'WCP'" <wcp2 at mchsi.com>; <amsat-bb at amsat.org>
Sent: Saturday, December 26, 2009 12:18 PM
Subject: [amsat-bb] Re: XW-1 FM

>A good question.  Some people seem to get in effortlessly, others seldom if
> at all.  I fall into the seldom category, though I had better luck today.
> Someone suggested that perhaps my dilithium crystals needed realignment, 
> so
> I pulled out my calibrated deviation meter, and verified the PL is set as
> recommended for the FT-847 at 700 Hz.  Next, I pulled out my counter with
> GPS time base, and measured 66.961 Hz for the tone.  I am pretty certain
> that an accuracy of .06% should be good enough.  ;)
> I am wondering if it wants significantly more or less PL audio level.  It
> shouldn't be too hard to rig up an external injection when the operation 
> is
> more frequent.  You have got to love satellite ops.  Always something
> interesting to consider!
> Alan

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