[amsat-bb] Re: Arecibo

Rick - WA4NVM wa4nvm at comcast.net
Sat Apr 17 05:54:56 PDT 2010

>> Luc and All,
>> I was able to copy the CW signal "fair" at times (when my local pulse
>> noise was down) today around 1840 utc with just a Cushcraft 432-20T
>> 73 all,
>> Rick WA4NVM
> Hi Rick, WA4NVM
> As far I remember the 432-20T should be a 10 + 10 elements crossed yagi.
> Do you remember if your antenna is connected for RHCP or LHCP ?
> Since Arecibo transmit a RHCP toward the moon and the moon reflects
> back a LHCP wave if you was able to copy the CW signal then your antenna
> should be LHCP.
> Please let us know if possible.
> Tanks
> 73" de
> i8CVS Domenico

You are correct about the antenna.  It is a 10 + 10 element crossed yagi. 
At the
time I put it back up a few years ago, I didn't know what the FM birds were 
RH or LH.  So, I took the delay line off and hooked up both driven elements 
the phasing harness "Y" in what Cushcraft called "axial radiation".

I would think this would give me the "best and worst" of everything.  It 
would make
my uplink power and downlink receive "half" of what they could be if they 
phased correctly.  Since I don't have any way to switch polarity, I use it 
this way
on all the birds.  I'm still very surprised I heard anything on this setup.


Rick WA4NVM 

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