[Elecraft] K3 audio output v headphone sensitiviy

John Clare jonron at bigpond.net.au
Mon Jul 14 16:45:12 EDT 2008


Hi Brian and all. I have an old pair of Kenwood HS5 headphones and plugged 
them in to my factory assembled K3 after donning them. Had to back the AF 
gain back by about 10% for comfortable listening. I have a question that 
someone out there with an Elecraft/Heil MD2 mic may be able to help with. I 
bought it second hand and the previous owner had re-wired to suit Icom. I 
now wish to use it on my K3 and would like to get the wire color code or 
find out which color wire the +8v goes to. I e-mailed Heil but they can't or 
won't tell me. Can any one with an MD2 give me the pin outs by color 
pllease? John Cl;are VK1CJ.
----- Original Message ----- 
From: "Brian Alsop" <alsopb at nc.rr.com>
To: <elecraft at mailman.qth.net>
Sent: Tuesday, July 15, 2008 3:45 AM
Subject: Re: [Elecraft] K3 audio output v headphone sensitiviy


> From the K3 manual page 20
> "Sterero or Mono 16 ohm min. recommended"
>
> 32 ohm earphones are quite common.  Not surprising 16 ohms is the 
> paralleled configuration of the two 32 ohm individual ear sides for mono.
>
> I first ran into 32 ohm earphones for an FT1000MP.
>
> 73 de Brian/K3KO
>
> WILLIS COOKE wrote:
>
>>I have not heard of 32 ohm impedance headphones.  The
>>DC resistance is not the impedance, but a 600 ohm pair
>>might have 32 ohms resistance measured with an ohm
>>meter.  Of course, I don't know what the British
>>military used.  The US used 600 ohm.
>>
>>Measuring several headsets resistance of the headsets
>>in my shack shows all kinds of resistances.  Some
>>Realistic (Radio Shack) stereo 8 ohms show 9 ohms with
>>the stereo speakers wired in parallel.  A Sony Walkman
>>stereo headset measures 30 ohms on each speaker.  A
>>Heil BM10 measures 32 ohms for each speaker.  A Heil
>>Pro-Set shows 215 Ohms on each speaker.  A Telex Model
>>A610-1 Military Surplus mono headset labeled 600 ohms
>>measures 285 ohms.  A Telex A1210 mono headset to FAA
>>Spec TSO C57 measures 615 ohms.  All of them work OK
>>with my TS-850 without major audio gain adjustments
>>from the speaker.
>>
>>Cookie, K5EWJ
>> --- David Cutter <d.cutter at ntlworld.com> wrote:
>>
>>
>>>They are 32ohm: don't know if the ear pieces are
>>>wired in series or parallel.  Didn't observe the manufacturer, but I'll
>>>get back to them in a couple of days and let you know.
>>>
>>>David
>>>G3UNA
>>>
>>>
>>>----- Original Message ----- 
>>>From: "WILLIS COOKE" <wrcooke at flash.net>
>>>To: "David Cutter" <d.cutter at ntlworld.com>
>>>Sent: Monday, July 14, 2008 5:26 PM
>>>Subject: Re: [Elecraft] K3 audio output v headphone
>>>sensitiviy
>>>
>>>
>>>
>>>>The aircraft headphones are probably 600 ohm
>>>>impedance.  Most ham headphones are 8 ohms.
>>>>
>>>>--- David Cutter <d.cutter at ntlworld.com> wrote:
>>>>
>>>>
>>>>>It has recently astonished me just how deaf some
>>>>>headphones are.  In my work
>>>>>I was given aircraft headphones that needed 2W to
>>>>>get the same audio output
>>>>>as our own make that needed about 20mW.  That
>>>>>
>>>quick
>>>
>>>>>test with the spl meter
>>>>>needs to be repeated on a calibrated jig and I'll
>>>>>
>>>be
>>>
>>>>>taking my ham phones in
>>>>>to get them checked.  I'll post the results here.
>>>>>
>>>>>David
>>>>>G3UNA
>>>>>
>>>>>
>>>>>
>>>>>----- Original Message ----- 
>>>>>From: "Jim Brown" <jim at audiosystemsgroup.com>
>>>>>To: "Elecraft Reflector"
>>>>>
>>><elecraft at mailman.qth.net>
>>>
>>>>>Sent: Monday, July 14, 2008 8:01 AM
>>>>>Subject: Re: Re: [Elecraft] K3 #1037 in IARU
>>>>>
>>>contest
>>>
>>>>>
>>>>>>On Sun, 13 Jul 2008 16:49:25 -0700, Fred Jensen
>>>>>>
>>>>>wrote:
>>>>>
>>>>>>>Slightly different subject, I wouldn't mind at
>>>>>>>
>>>all
>>>
>>>>>if the K3 had more
>>>>>
>>>>>>>audio available in the headfones from both the
>>>>>>>
>>>>>monitor and sidetone.
>>>>>
>>>>>>Fred,
>>>>>>
>>>>>>There's an AF Gain setting in the Config Menu.
>>>>>>
>>>>>Check that it's set to
>>>>>
>>>>>>"HI."  If you need more, maybe I can help you
>>>>>>
>>>find
>>>
>>>>>headphones with higher
>>>>>
>>>>>>voltage sensitivity.
>>>>>>
>>>>>>Jim
>>>>>>
>>>>>>
>>>>>>
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>>>>>
>>>>>
>>>>Willis 'Cookie' Cooke
>>>>K5EWJ
>>>
>>
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>>
>
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