[Elecraft] Heil Headset HC-5

[David Wilburn]

Thanks for all the great input from everyone.  I think I will see if I 
can swing the Elecraft/Heil pro-set, install the resistor in the rig, 
and just switch between the two as needed.

David Wilburn
dave.wilburn at verizon.net
K4DGW
K2 #5982


Don Wilhelm wrote:
> Jack,
> 
> You are quite correct, I know you and some others have been successful 
> with increasing the KSB2 R14 resistor value, but that will change the 
> loading on the MH2/MD2 mics (which can change the audio output 
> characteristics).  Since Dave wants to use the MH2/MD2 directly on the 
> K2, in this case I believe the external preamp/adapter is the best 
> approach.  Using the mic 5 volt line has its limitations, but with a 
> short cable between the preamp box and the K2 I have not had problems 
> powering the preamp - just don't load it down or use a long cable (6 
> inches to 1 foot is enough).
> 
> Of course how to implement it is an individual choice, I can only speak 
> for the implementation that I see is easiest for all the factors in 
> consideration, but the final choice is up to the individual builder. 
> There are many workable choices available.
> 
> 73,
> Don W3FPR
> 
> Jack Brindle wrote:
>> 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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>