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 > _______________________________________________ > Elecraft mailing list > Post to: Elecraft@mailman.qth.net > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com > > -- View this message in context: http://www.nabble.com/K3%3A-R-MH2-mic-problems-tp16917192p16927355.html Sent from the Elecraft mailing list archive at Nabble.com. _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com -- No virus found in this incoming message. Checked by AVG. Version: 7.5.524 / Virus Database: 269.23.5/1400 - Release Date: 4/27/2008 9:39 AM _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
