[R-390] Cosmos PTO SUCCESS!!

[Scott, Barry (Clyde B)]

Phil,

The radio was simply reminding you who is in charge.

"Hmmmm, sensors indicate the human is attempting to enjoy the radio without
having produced any angst.  Expectations of being able to place the radio in
the rack and "plug-and-play" must be quashed immediately."

MSG: R390A-TO-PTO.  Change endpoint setting +3kc.  If attempts are made to
modify, change endpoint setting to +4.1kc regardless of slug settings.  Hold
setting for 36hrs.  Revert to original setting.  EOT


Barry(III)-nonHW - N4BUQ


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.
  
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.  


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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