[Hammarlund] Still more bad micas

[Phil Atchley]

Hello
Well, it looks like there are still some more bad mica capacitors in this
SP-600, this time in the band 4 module.  I am listening to some SSB in the
20 meter band and the frequency is jumping around like bands 5 and 6 did.
To double check I went to the 15 Meter band on band 5 and they are rock
steady.  Back to 20M and it's jumping around.  So, a little later this
morning it goes back on the workbench for servicing.  I'll probably do band
3 at the same time just to be on the safe side.  At least bands 1 & 2 were
done while I was replacing the BBoD's. 

I suspect if one were able to measure gain closely enough a person 'might'
be able to detect problems in the micas that are in the RF amplifier coil
modules.  Luckily they aren't as critical and a capacitor would probably
have to be really bad to cause any problems there.  A one or 2 PF change
probably isn't going to affect the circuit to any degree. 


73 de Phil, KO6BB

****************************************************
*  DXing WITH THE FOLLOWING EQUIPMENT.             *
*  RECEIVERS:                                      *
*    Hammarlund SP-600JX17 Surplus receiver with   *
*               Hammarlund HC-10 Sideband adapter. *
*    Yaesu VR-5000 Wideband, "DC to Daylight".     *
*    Homebrew Longwave "Hybrid" CW receiver.       *
*    Others that pass thru or are waiting repair.  *
*  Homebrewed Ant/Rig switchbox with filters/Amp.  *
*  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.           *
*  COORDINATES: 37.18N  120.29W  CM97sh.           *
****************************************************



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