[R-390] Adjusting BFO Neutralization

[Philip B Atchley]

Hello all.
When I finished the Langford AGC/BFO mods I needed a way to set the BFO
neutralization.  Not having a scope or other way to look at an RF signal
at the IF output jack, I was having difficulty doing this.  I even tried
making an RF probe for my DVM, using a Ge diode, not sensitive enough.

THEN, it hit me.  I had that MilliVac RF MilliVoltmeter that was given to
me (a real obsolete piece of gear 8^).  I had to contrive a way to
connect to the screw on connector since the probe tip was missing.  Once
that was accomplished, Eureka!  It worked and I was able to set the
neutralization.  Even after who knows how many years since the last
alignment AND the Langford mods it only needed just a slight tweak.

So, I guess that no matter how ugly (and it is an ugly greasy green rack
mount unit) or obsolete a piece of gear is, it may still be of use in the
home 'lab'.

73 de Phil  KO6BB
Loving home provided for wayward Boatanchor Receivers.
R-390A '67 EAC.  HALLICRAFTERS SX-71 ('53) & 5R10A ('53).
REALISTIC  DX-160 ('78).  HOMEBREW  Longwave CW receiver.
Merced, Central California, 37.18N  120.29W  CM97sh.

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