[Elecraft] K1 VFO frequency range change

[Rick Dettinger]

I changed the VFO frequency range capacitor to 120 pf and now have a 178 khz
tuning range.  Since I only need 125 khz to reach the SKCC frequency  of
7120 khz, I may try a 100 pf capacitor.  I would like to know what types of
capacitors will work will here.  The 68 pf  capacitor is a disc ceramic and
the 120 pf  capacitor is a polystyrene type.  To make this change, I not
only needed to change the VFO capacitor, but also the 30m xtal and futz
around with the turn spacing on the VFO coil to get the proper VFO range.  I
do not find the 18 khz per revolution tuning rate to be difficult but it is
my nature to keep fussing.      73 - Rick - K7MW
----- Original Message -----
From: "Rick Dettinger" <k7mw at cmc.net>
To: <elecraft at mailman.qth.net>
Sent: Monday, April 03, 2006 10:12 PM
Subject: [Elecraft] K1 AGC time constant


> I changed C31 on the RF board to 1uf  but it still seems very slow.  When
I
> remove an S9 siginal  (50uv) it takes about 15 seconds for the S meter to
> decay to one bar.  I used a non polorized electrolitic cap as that is what
> they had at RS.  It is physically larger than the original cap but there
is
> plenty of room.  I am not sure what a non polorized electrolitic capacitor
> is but there are no polarity marks,  which I haven't seen before.  Should
I
> try a smaller value for C31?         Thanks - Rick - K7MW
>
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