KSB2

[k6dgw]

Hi all,

Although I operate almost no SSB, I built the KSB2 for my K2 (#4398)
late last year so I could use the K2 for RTTY contests.  It seems to do
everything a well conditioned KSB2 should do except it exhibits about 30
dB loss through the on-board filter.  Thus, the SSB output from the K2
is in the milliwatt range and the RX level drops very noticably with the
OP1 filter selected.  I haven't had the time to figure it all out, and
it's a bit tough since my test equipment is limited to a DMM, old Tek
scope, and a very old service monitor.

Given the likely cost of commercial repair through Elecraft, I decided
I'd just build another KSB2, and it came today.  This will leave me with
the slightly-under-the-weather unit for which I have no use.

If someone would like to mess around with it, I'll send it to you.  All
I ask is a charitable donation.  I'll suggest a favorite charity, but it
and the amount would really be up to you.

I'd be able to mail it as soon as I get the new one built and working
(without it, my beloved K2 is dead, of course and I can't take that).  I
may have it built and done by the weekend.

I'll pick the first email that arrives.

73,

Fred K6DGW
Auburn CA CM98lw
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[Dan Barker]

I think you should keep the KSB2 until the new one is finished also, BUT...

The statement "without it, my beloved K2 is dead" is not true. Just stick a
couple jumpers in the short jacks (1 to 3), and a [I Forgot] pF cap in the
big one, between 5 and 7 if memory serves.

Dan / WG4S / K2 #2 456

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[Ron D'Eau Claire-2]

Fred, take care not to put too much solder on the pins of the crystals when
you install them in your new KSB2. One of the most common reasons for low
gain is a bit of solder that puddled around the pin under the crystal can
where you can't see it and shorting the signal path to the can. Remember,
those are plated through holes, so when solder melts and flows on the bottom
side, it's melted and flowing on the top side under the crystal too!

Ron AC7AC

-----Original Message-----

Fred, K6DGW wrote:

Although I operate almost no SSB, I built the KSB2 for my K2 (#4398)
late last year so I could use the K2 for RTTY contests.  It seems to do
everything a well conditioned KSB2 should do except it exhibits about 30
dB loss through the on-board filter.  Thus, the SSB output from the K2
is in the milliwatt range and the RX level drops very noticably with the
OP1 filter selected.  I haven't had the time to figure it all out, and
it's a bit tough since my test equipment is limited to a DMM, old Tek
scope, and a very old service monitor.


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