I'm guessing here - but - it sounds like you might have the bias turned on
to the K3 mic connector. Heil HC-4 elements do NOT require bias and putting
bias on them will usually (have to file the usually caveat here as there
may be some strange wiring involved) prevent them from working!
Let's try this:
1. Tap - Menu (the display will probably show a number 6 on the upper
line and LCD BRT on the lower line - at least mine always seems to come up
that way if enough time has gone by since I used it last). Regardless of
what the display defaults to, after you have tapped Menu do the
following:
2. Rotate VFO B knob to until you see: MIC SEL on the LOWER line. The
UPPER line will display the current mic settings:
3. If the UPPER line shows something like: FP.H(or L) followed by a space
and then the word bias you have the bias turned on for the mic input
selected (either FP for Front or RP for rear).
4. If the word bias shows up, then you do indeed have the bias turned on.
5. If the bias is turned on, then TAP the REV button (it has a red #2 in
small print under it) once and the word bias will disappear.
NOTE: The REV button alternately turns the bias to the mic connector on and
off.
6. If the top line now shows something like FP.H with nothing following
it, you have selected the Front panel mic input (the FP) and have selected
high gain ( the H). You can change from H to L by tapping the A/B
button (it has a small red #1) under it.
On my both my HC-4 and HC-5 elements, I use the H setting and adjust the
MIC gain accordingly.
If the bias is not turned on, then all the above is not going to solve
your problem. If this is true, the 8 pin plug on your mic is likely wired
in some strange way.
Please give it a go and report back.
As usual, YMMV. Have fun - ' 73 es gud dxing -- Don N4HH K3 #83
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of VE3NFK
Sent: Sunday, April 27, 2008 3:15 PM
To: elecraft@mailman.qth.net
Subject: Re: Re:[Elecraft] K3: R-MH2 mic problems
Hi I have sn 709 - I have my Heil HC4 from my TS-2000 8 pin conn - when I
plug it into the K3 - I hear noise from the MICROPHONE???
The 'manual' says: to select front or rear panel microphone AND to turn
BIAS on/off, use the MAIN:Mic SRC menu entry..
My firmware 1.78 only shows: MIC SEL FP.H b1 A5 and I have not figured
out how to adjust it - the main VFO knob also gives me a choice of rP.H and
LInE In ..
On a separate note - I have this anomaly that I emailed support on Friday
night:
Managed to 'lock-up' my K3 - NO buttons work - including power - had to
pull the power plug
going thru the config menu - at PTT-KEY both ' OFF-OFF' tried to change
values and complete lockup
Completely repeatable - go to config PTT then move main vfo control and
lock up.
Was on AM 13840 listening to a SW station/
Changed mode/freq - still does it - as soon as main VFO adjusted.
Any advice/help comments?
tnxs
John VE3NFK
Gary Hembree wrote:
This is a known problem with the Rev B front panel artwork. I had the
exact same problem with a MH2 mike when I first used my K3/100 SN 729 a
week ago on 6 meters to contact a local friend who is a well-known VHF and
HF DXer and contester. Unfortunately it did not make a good impression!
There is a ground trace missing from one end of C98 and C97 on the front
panel board. These capacitors are associated with the mike bias circuit.
Hence the problem with the MH2. I am told that an official Elecraft fix
is going to be released this coming week. Several of us who noticed this
problem were given the fix to try and it worked three out of three times.
If you must use a mike that needs bias then use the rear panel connector
for now (i.e. Elecraft or Icom Proset). MH2s are excluded of course,
unless you have an appropriate adapter. 688 is the earliest SN that we
know is affected. The other three were 690, 728 and 729. Elecraft is
fixing front panel boards now before they ship anymore.
73
Gary, N7IR
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