[R-390] Cosmos PTO end point coil

Fri, 27 Jun 2003 09:22:14 -0400

One more nit... just be sure you put the inner can cover back on the PTO.
If the cover if off it will be way off.  The proximity of metal can does
affect the tracking.
----- Original Message -----
From: "Jim Miller" <[email protected]>
To: "Phil Atchley" <[email protected]>; <[email protected]>
Sent: Friday, June 27, 2003 9:14 AM
Subject: Re: [R-390] Cosmos PTO end point coil


> If you have the slug fully counter clockwise, you may need to run it in
> clockwise more.  The adjustment is an iterative process.  See Dave
Medley's
> procedure at http://www.davemed.com/pto.html
>
> ----- Original Message -----
> From: "Phil Atchley" <[email protected]>
> To: <[email protected]>
> Sent: Friday, June 27, 2003 12:26 AM
> Subject: [R-390] Cosmos PTO end point coil
>
>
> Hi.
> Earlier I tried to set the end points on this unit.  I got it within 3 KC
at
> which point the slug dropped into the PTO.
>
> SO, I bravely pulled the PTO and carefully opened it up.  I didn't observe
> any unusual escape of nitrogen gas as I pulled the inner shield 8^)
Anyway,
> I reinserted the slug, removed 1 turn from the end point coil (it had 3
> turns) and reassembled the PTO.
>
> NOW IT'S WORSE THAN EVER.  Best I get is within about 10KHz, that with the
> slug turned fully anti-clockwise.  The 100 KHz markers are 1000 and 1990
KHz
> at the ends indicating that exactly 10 turns of the tuning dial are tuning
> further than 1MHz.  I only removed one turn but that appears to have been
> too much.  HOW MANY TURNS DOES THIS COIL TYPICALLY HAVE IN A CORRECTLY SET
> UP UNIT?  I wonder of someone previously removed turns?
>
>
> Stoopid Cosmos PTO's!
>
> 73 de Phil, KO6BB
>
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