[Elecraft] Heil Headset HC-5

[Don Wilhelm]

Dave,

Since your plan is to use both the MH2 and the Heil headset with the 
HC-5 element, I strongly recommend that you jumper the K2 mic 
configuration header for the MH2 - all pins jumpered straight across 
(use the little configuration jumpers for computer headers) and solder a 
5600 ohm resistor across pins 1 and 6 of the mic jack.

You might also consider connecting the headphone audio to pin 5 of the 
mic jack - leave the jumper off the header pin 5 and connect the audio 
to the header pin marked "5" with no connection to the pin marked "FUNC"

Then for the Heil headset, build a preamp/adapter in a small external 
enclosure - the headset plugs into the adapter.  You will need a preamp 
to successfully use the Heil HC5 element.

I have a schematic (it is a bit cluttered, but usable) for a preamp that 
was designed just for that application - unfortunately I cannot attach 
it to the reflector post, so I will send it to you separately.

73,
Don W3FPR

David Wilburn wrote:
> I have a Heil headset that I purchased about 4 years ago.  I'm not sure 
> if it is the "pro" or not.  As memory serves, at the time, the next step 
> up had a dual element with a switch.  The headset has an HC-5 element. I 
> have an adapter to this to connect to my recently sold, since finishing 
> my base K2, Kenwood TS-570D(G).  I have also purchased an MH2 microphone.
> 
> The original plan was to sell a different radio, (IC-718) and keep the 
> TS-570 and thus the headset.  The plan then was to use the MH2 for the 
> K2.  I will still be using the MH2 primarily for the K2.  But I want to 
> be able to use the headset on occasion as needed.
> 
> I understand the instructions for wiring up the MH2 on the K2.  How will 
> this impact the use of the headset?
> 
> This email suggests it only needs straight across jumpers.
> http://www.ac6rm.net/mailarchive/html/elecraft-list/2003-01/msg00598.html
> 
> If that is the case, and I do have the Kenwood adapter already, then if 
> I just put the straight jumpers in, I should be fine.
> 
> If I want to use the MH2, then I need to either put the resistor in the 
> microphone somehow (not something I am looking to tackle with my large 
> hands) or make an adapter cable for the MH2 that has the resistor in it.
> 
> Am I barking up the correct tree hear, or chasing a feral goose?