[amsat-bb] Re: 18 el cp yagi

MM ka1rrw at yahoo.com
Thu Jan 21 06:34:00 PST 2010

Hi Bob:

Not sure by your description , what type of CP antenna you have.
Here is a link for the common old KLM.

You have 3 options.
1.  Surf the web for info, on how to rebuild the box and water proof it.
2.  Surf for tips on how best to rewire the antenna for Fixed Right-Hand-CP. By removing the switch you maybe able to improve you gain and reduce switch induced losses.
3. Replace it with a M2,  2MCP22

I use to have the KLM 2m-22CP.  I found the switch box unreliable and had high loss.  The Driven elements were hollow aluminum tubes that would fill with water, Freeze and crack.  After a few years I took it down and replaced it  with the  2MCP22.  I have had good luck with it and I do not miss the polarity switch.  And I do not have problems with water getting into the switch or connector junction blocks.
wf1f Miles

> From: Bob- W7LRD <w7lrd at comcast.net>
> Subject: [amsat-bb]  18 el cp yagi
> To: amsat-bb at amsat.org
> Date: Thursday, January 21, 2010, 1:49 AM
> Hello 
> I am refurbishing a 18 element CP yagi.  I am not sure of
> the manufacturer.  I opened up the relay switching box and
> found a lot of moisture (Yes I live near Seattle) in the
> box.  Lots of yuck and rust, on non stainless steel
> hardware..  The 12V connector is a simple phono plug, which
> should never be used outside.  Before I reinvent the wheel
> has anyone been here before?  Replace the phono plug,
> sealing everything.  In the past I have used a material
> called 3M5200, a marine sealant, nasty but almost
> permanent.  Suggestions please. 
> 73 Bob W7LRD 
> Seattle 
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