Wow. Perhaps we can get a bit more helpful. Pretty much every wire
going into or coming out of the K2 presents a very good possibility
for RFI intrusion. This is true for any rig. The low-level microphone
signals are a very good place for this to occur - for me it seems
that having a regular microphone attached things work OK, but connect
it to a sound interface box and you are asking for problems. The
serial port KIO2 or KPA100's port has quite a few of these
opportunities. Even the power cord could be a conduit for RF.
My own station suffers from RFI on 40 meters, where I have an antenna
running just 20 feet over the K2/100. Through various methods of
shielding, the use of ferrite cores and other methods, I have reduced
this problem quite a bit. But I have yet to eliminate it (It's sort
of become a crusade...).
There is a lot of information available discussing the subject. Jim
Brown, K9YC, has an excellent collection of RFI information that I
currently believe to be the best available on the web. There is a lot
of information at his site, some directly discussing ham rigs, most
discussing RFI in audio systems. See:
http://audiosystemsgroup.com/publish
One of the things Jim advocates is the use of twisted pair to carry
signals in and out of the K2. By doing this, the signals essentially
become carried in a differential mode of operation, where the
interference tends to cancel itself out. I can't say this is the
ultimate solution, but it is the direction I am taking my own station.
Good luck tracing down the problems. Some folks are really lucky,
while others have a great learning opportunity for dealing with EMI
and RFI. learning new things is what it's all about, right?
On Feb 2, 2006, at 5:59 AM, [EMAIL PROTECTED] wrote:
I'm having problems with rf interference when attempting to
transmit. I have a list of possibilities which don't need exposure
here, but I do want to know if the K2 with the rear cover it comes
with with all of the unfilled openings can allow rf into a place
where it could be a problem?
Should I block the holes?
I would be delighted to find out this isn't a possibility in any case,
73, John Ferguson KI4NGH
_______________________________________________
-Jack Brindle, W6FB
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