[R-390] Cosmos PTO SUCCESS!!

[Phil Atchley]

Good morning folks.
Well, after sleeping on it all night (figuratively speaking ;-) I jerked
this PTO out first thing this morning having decided to rewind the coil
This coil originally had three turns when I first opened it, though it
appeared to have been "violated" before.

I dug through my junk coil tray and found a slug tuned coil that looked =
like
it had the same gauge wire on it (close as I can determine via eyeball). =
 I
stripped a few inches off it and tinned one end.  I then re-wound the =
end
point coil (Yes, it was the end point coil, somebody inquired if I had =
the
correct coil).  I put three turns on it, just like it had when I =
started.
Close wound and nice snug turns.  I then gave it a light coat of clear =
nail
polish to hold the turns in place and "cooked" it under a light bulb for =
a
short time.
 =20
Upon re-installing it and setting the starting point to 1000 KHz I =
checked
the upper end.  With the slug all the way counterclockwise it was 2.5KHz =
off
end to end.  (BEST I could get (before I dropped the slug in) was about =
3
KHz. A couple clockwise turns of the slug brought it dead on to 1000 to =
2000
KHz, Plus/minus 100 Hz!  Time will tell if it stays good!

I really don't know why it wouldn't tune up with the original coil (also =
3
turns) but it wouldn't!  The only thing I can think of is that the coil =
was
rather loosely wound and sloppy, perhaps by a previous "tweaker".

NOW FOR LINEARITY:  In checking across the 100KC points I see about 2KC
worst case.  I don't have a frequency counter but I intend to use my =
Yaesu
digital radio in SSB mode and tune each of the screws for "zero beat".
Should be good for getting it within 100 CPS. =20


73 de Phil, KO6BB

****************************************************
*  DXing THE WORLD WITH THE FOLLOWING EQUIPMENT.   *
*  RECEIVERS:                                      *
*    '67 EAC R-390/URR Surplus Receiver with a     *
*            HAMMARLUND HC-10 Sideband adapter.    *
*    YAESU VR-5000 Wideband,  REALISTIC DX-392.    *
*    Home built Longwave "Hybrid" CW receiver.     *
*    Others which pass thru or are waiting repair. *
*  ANTENNAS:                                       *
*    Coil Loaded 18.5 Meter Long Sloper.           *
*    Roof mounted Hustler 6BTV 6 band Vertical.    *
*    Scantenna Scanner antenna at 7 Meters high.   *
*  LOCATION: Merced, Central California.           *
****************************************************




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