[Elecraft] #3062 Part II BFO test problem

[Rod N0RC]

Ron,

Nice callsign... ;-)

----- Original Message -----
From: "Ron Schuster" <rschuste@one.net>
To: <elecraft@mailman.qth.net>
Sent: Monday, January 27, 2003 7:46 AM
Subject: [Elecraft] #3062 Part II BFO test problem


> My frequency measurement results are:  high freq is 4917.0,  low freq
is
> 4913.5
>
> The low frequency spec is less than 4912.  The range spec is 3.6.  It
fails
> both of these.
...
> Any ideas??


These instructions came with my A to B upgrade kit perhaps they'll
help....

"If your BFO range is slightly less than 3.6 kHz, and/or the low
frequency is higher than 4912.7, your BFO crystals probably have higher
than average Q. You can safely compensate for this by increasing the
size of C174 and C173 in the BFO circuit. The Temperature Stability mod
kit (BFOMDKT) includes two capacitors for this purpose, 47 pF to
parallel with C174, and 120 pF to parallel with C173. If you didn't
order this mod kit, you can use any temperature-stable capacitors (NPO,
C0G, or N750 types) in the following ranges: 39-68 pF (in parallel with
C174), and 100-180 pF (in parallel with C173)."

73, Rod N0RC
Elecraft CC: 1.5 of 100, started 05-Jan-2003