[Elecraft] Heil Headset HC-5

[Jack Brindle]

Sigh. Don and I have agreed to disagree on this point. I have used my  
K2/100 quite successfully for several years with a Heil Pro headset.  
Mine has the HC-4 element.

I would try it _without_ the preamp  just to see how it works for you  
before deciding you need the extra box. You may end up needing one,  
or things might work just fine.

I would also wire the resistor in the microphone connector for the  
MH2. Small area to play in, but it gets it out of the way. The down  
side is the need to pull power from the K2 out to the connector. I  
have learned that the mic power pin is a prime intrusion point for RFI.

On Apr 6, 2007, at 5:03 AM, Don Wilhelm wrote:

> 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?
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- Jack Brindle, W6FB
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