[Elecraft] SSB Adapter Question and a Gremlin

[Dale Wiese]

Hi all;

Built the KSB2 and KIO2 modules this weekend.  One question.  On page 19
of the KSB2 manual, it asks me to set R60 on the RF board fully counter
clockwise.  On my board (#3064) R60 is a fixed 100 ohm resistor and the
PA Bias schematic also shows this as a fixed resistor.  I assume this is
a design change with the newer main board, and needs to be added to the
errata sheet for the KSB2 board?  If I am wrong and there is a pot
somewhere I need to tweak, please let me know.

The SSB adapter appears to be working well.  I swung up to 10 meters and
worked a dozen or so contest stations with no problem.  I also made an
HFPack contact on 17M and a couple contacts on 20M.  

Late last night I built and installed the I/O adapter, and for a while,
thought I had messed something up.  The  radio talks to the computer
just fine, but I had no transmit audio on SSB.  CW was working fine, and
I could key the xmiter with the mic, just not get any power output on
SSB.  I also tried VOX, and found I could not trigger xmit with VOX.
This afternoon I did some tracing, and found I had no mic AF.  I had a
signal path to the SSB board, but nothing was coming across.   Bashed
around for a while, and started to wonder if the Heil mic had gone bad.
As a cross check (Since I don't have a scope at home to actually see the
mic output) I grabbed a Yaesu hand mike, stuffed some wires in the GND
and AF pins, and held the wires up to the GND and AF pins on the radio.
Presto, the VOX immediately started to key the rig, and I observed
output power on my external meter. It was fluttering in and out since I
was just holding up the bare wires to the male pins on the radio.  Now
it gets weirder.  I plug the Heil mic back in, and the VOX keys the
radio!  Ran a 1/2 dozen contacts on 10M, and everything now seems to be
working just fine.

So the question is, do I have an intermittent problem with the Heil mic,
or did I do something bad to the radio while installing the I/O board,
which was cleared up due to the rapid operation of the VOX circuit while
testing with the Yaesu mic?  

Any thoughts would be appreciated.

Dale N9XD