Elecraft

Need Pinout for Heil HMM "icom" hand mic

Classic

List

Threaded

3 messages Options

Rick Tavan N6XI

Need Pinout for Heil HMM "icom" hand mic

I need to connect a Heil HMM "for icom only" mic to a K2. The KSB2 and Heil
Website don't mention this mic. The pinout is not the same as the
Heil-manufactured Elecraft MH2. The mic has a handwritten label "PTT 5&6"
and I have confirmed that this is correct. How do I jumper the mic pin block
for audio (pin 1?) and 5V? What value bias resistor should I try?

Thanks,

/Rick N6XI
_______________________________________________
Elecraft mailing list
Post to: [hidden email]
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

w7aqk

Re: Need Pinout for Heil HMM "icom" hand mic

Rick,

Your K2 Manual shows all the pinouts, and it describes how to jumper the
various pins if needed. You just need to look at the pinout for the mike
you have, and jumper accordingly. You may have to solder some of the
jumpers if they are not directly across. Otherwise, just use the pins
jumpers provided. If your microphone is an electret, you will need to put a
jumper between the V+ pin (pin 6 I think), and whichever pin is your
microphone pin. It's all described there.

Dave W7AQK

----- Original Message -----
From: "Rick Tavan N6XI" <[hidden email]>
To: "Elecraft Reflector" <[hidden email]>
Sent: Sunday, June 08, 2008 11:00 AM
Subject: [Elecraft] Need Pinout for Heil HMM "icom" hand mic

>I need to connect a Heil HMM "for icom only" mic to a K2. The KSB2 and Heil
> Website don't mention this mic. The pinout is not the same as the
> Heil-manufactured Elecraft MH2. The mic has a handwritten label "PTT 5&6"
> and I have confirmed that this is correct. How do I jumper the mic pin
> block
> for audio (pin 1?) and 5V? What value bias resistor should I try?
>
> Thanks,
>
> /Rick N6XI
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> 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
>

_______________________________________________
Elecraft mailing list
Post to: [hidden email]
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

Don Wilhelm-4

Re: Need Pinout for Heil HMM "icom" hand mic

In reply to this post by Rick Tavan N6XI

Rick,

Grab the KSB2 instruction manual and look at the wiring for Icom
microphones.
Since you are using a Heil mic (with an Icom adapter), you only need to
be concerned about the AF pin, the PTT pin, the AF Ground and the PTT
Ground - connect those pins on the K2 microphone configuration header -
Heil mics only implement those 4 signal lines.

Since the Icom rigs apply bias to the AF pin, you need a bias resistor
from +5 volts to the Mic jack AF pin. Usually a value between 5.6k and
10k will work, but if you need the best value, contact HeilSound and ask
for the recommended value for the Icom element from a +5 volt rail.
If I assume that the Icom element in that mic is the same as in the
Elecraft ProSet K2 or MH2, then 5.6k is the best value, the that is one
assumption too many - best to ask HeilSound about that.

73,
Don W3FPR

Rick Tavan N6XI wrote: