the element should be wired directly to the mic or audio input and mic
ground of the kenwood mike jack.
what's likely happening is the heil adapter is wanting mike audio to be tip,
PT to be ring and sleeve to be ground...and the kenwood speaker mike is
probably using the ring for audio and the tip for PTT...
also, silly question, but you know that kenwood speaker mikes have the
larger plug, the 3.5MM plug for the speaker or audio out, and the 2.5MM or
smaller plug for audio input or microphone?
I thought the heil adapters just used the 3.5MM sized jack and didn't accept
the 2.5MM?
Unless you have rewired the speaker mike to send mic audio to the 3.5MM jack
which is not the standard design.
So, try putting one side of the mike element to the tip of the 3.5MM plug,
and the other side to the sleeve, and you should get results...
All that said, I have no idea what the heil adapters wiring scheme is, but
for the most part, most microphones that terminate in a 3.5MM jack use the
tip and sleeve for the microphone element and the ring for either power if
its a condenser or some other function other than audio. presumably, the
Heil adapter uses the ring for the PTT function...
to answer your original question, most, if not all modern ham rigs use
600ohms mike impedance.
it's standard in the audio industry more or less...that's why you can use a
studio microphone directly into the radio and get proper modulation.
73
Colin, V A6BKX
----- Original Message -----
From: "Mark" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, February 18, 2010 4:25 PM
Subject: Re: Mike Impedance for modern Radios
> OK, this brings up an interesting question. How should the mike element be
> wired?
>
> God bless,
> Marks
> Jesus Is Lord!
> ----- Original Message -----
> From: "Steve Dresser" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Thursday, February 18, 2010 1:17 PM
> Subject: Re: Mike Impedance for modern Radios
>
>
>> Mark,
>>
>> Sounds like you've got your element across the PTT leads.
>>
>> Steve
>>
>> ----- Original Message -----
>> From: "Mark" <[log in to unmask]>
>> To: <[log in to unmask]>
>> Sent: Thursday, February 18, 2010 15:37
>> Subject: Re: Mike Impedance for modern Radios
>>
>>
>>> Hi John,
>>> Oddly, when I was tripping the VOX it was just the two wires
>>> touching
>>> with no mike element. Now that I attached the wires to the element it
>>> quit
>>> tripping the vox. Its an odd one.
>>>
>>> God bless,
>>> Mark
>>> Jesus Is Lord!
>>> ----- Original Message -----
>>> From: "John Miller" <[log in to unmask]>
>>> To: <[log in to unmask]>
>>> Sent: Thursday, February 18, 2010 12:29 PM
>>> Subject: Re: Mike Impedance for modern Radios
>>>
>>>
>>>> it trips the vox but there's no audio? strange, is your mic gain set
>>>> too
>>>> low? what if you crank it all the way up? any improvement? if it's
>>>> tripping
>>>> the vox there must be some audio there.
>>>> ----- Original Message -----
>>>> From: "Mark" <[log in to unmask]>
>>>> To: <[log in to unmask]>
>>>> Sent: Thursday, February 18, 2010 3:15 PM
>>>> Subject: Re: Mike Impedance for modern Radios
>>>>
>>>>
>>>>> Hi John,
>>>>> Actually, I rewired the mike head to go directly from the element
>>>>> to
>>>>> the cord. Then I can use either VOX or the PTT for the Heil. On the
>>>>> plug,
>>>>> I
>>>>> am using the shield and the tip. These two seemed to trip the VOX on
>>>>> the
>>>>> radio. So, I am puzzled.
>>>>>
>>>>> God bless,
>>>>> Mark
>>>>> Jesus Is Lord!
>>>>> ----- Original Message -----
>>>>> From: "John Miller" <[log in to unmask]>
>>>>> To: <[log in to unmask]>
>>>>> Sent: Thursday, February 18, 2010 11:31 AM
>>>>> Subject: Re: Mike Impedance for modern Radios
>>>>>
>>>>>
>>>>>> are you using the ptt button on the mic? or the ptt you'd usually use
>>>>>> with
>>>>>> the heil mic? If the usual ptt switch, try the mic holding the ptt
>>>>>> button
>>>>>> at
>>>>>> the same time and see if maybe that switches the element on and off.
>>>>>> I
>>>>>> don't
>>>>>> think HT mics do use the voltage but it's possible, I haven't seen
>>>>>> one
>>>>>> yet
>>>>>> but there's got to be a reasonable reason, something's not wired
>>>>>> right.
>>>>>> If
>>>>>> that a 3 conductor plug on the HT mic? I need to check mine but if
>>>>>> so,
>>>>>> I'm
>>>>>> wondering if the audio is not the tip.
>>>>>> ----- Original Message -----
>>>>>> From: "Mark" <[log in to unmask]>
>>>>>> To: <[log in to unmask]>
>>>>>> Sent: Thursday, February 18, 2010 2:14 PM
>>>>>> Subject: Re: Mike Impedance for modern Radios
>>>>>>
>>>>>>
>>>>>>> Hi John,
>>>>>>> I am not sure about if the microphone had power to the element
>>>>>>> before
>>>>>>> I
>>>>>>> rewired it but I was under the impression that microphones for handy
>>>>>>> talkies
>>>>>>> didn't actually use that style element. I really don't know.
>>>>>>> The Heil headset still has good audio. its just physically seen
>>>>>>> better
>>>>>>> days.
>>>>>>> Actually, I am using the Heil adapter to plug the 3.5 MM plug
>>>>>>> for
>>>>>>> the
>>>>>>> handy talkie mike in to the Kenwood.
>>>>>>>
>>>>>>> God bless,
>>>>>>> Mark
>>>>>>> Jesus Is Lord!
>>>>>>> ----- Original Message -----
>>>>>>> From: "John Miller" <[log in to unmask]>
>>>>>>> To: <[log in to unmask]>
>>>>>>> Sent: Thursday, February 18, 2010 10:42 AM
>>>>>>> Subject: Re: Mike Impedance for modern Radios
>>>>>>>
>>>>>>>
>>>>>>>> if the impedance was off, you'd have low audio but something would
>>>>>>>> be
>>>>>>>> there.
>>>>>>>> What it might be is, does the mic need power to work? and did you
>>>>>>>> make
>>>>>>>> sure
>>>>>>>> it's getting it? Some of those mics need power to the element. Was
>>>>>>>> the
>>>>>>>> mic
>>>>>>>> working before? Also, what was the problem with the heil mic? it
>>>>>>>> wasn't
>>>>>>>> the
>>>>>>>> same was it?
>>>>>>>> ----- Original Message -----
>>>>>>>> From: "Mark" <[log in to unmask]>
>>>>>>>> To: <[log in to unmask]>
>>>>>>>> Sent: Thursday, February 18, 2010 1:20 PM
>>>>>>>> Subject: Mike Impedance for modern Radios
>>>>>>>>
>>>>>>>>
>>>>>>>>> Hi
>>>>>>>>> I decided to convert one of my junk box two meter mikes to a
>>>>>>>>> mike
>>>>>>>>> =
>>>>>>>>> for my Kenwood TS 440 S. This will hold me over until my Heil head
>>>>>>>>> set
>>>>>>>>> =
>>>>>>>>> is repaired. The conversion went smoothly and every thing went
>>>>>>>>> well
>>>>>>>>> =
>>>>>>>>> until I tried to use the mike and no audio came out. I am sure the
>>>>>>>>> =
>>>>>>>>> wiring is right. So, I am left with the question of would this be
>>>>>>>>> an
>>>>>>>>> =
>>>>>>>>> issue of having the wrong impedance microphone? If so how does one
>>>>>>>>> go
>>>>>>>>> =
>>>>>>>>> about changing the impedance?
>>>>>>>>> Thank you in advance for your help.
>>>>>>>>>
>>>>>>>>> God bless,
>>>>>>>>> Mark
>>>>>>>>> Jesus Is Lord!
>>>
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