telex head set

[Robert 'RC' Conley]

I have been given a TELEX head set.
I wish to know more about it.
Impedance? Microphone type?
Can it be used with my K3?
 MRB 2400
WT. .94 LBS
MPLS. MINN
FAA TSO C57 & C58
CAT.-B
RC kc5wa
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[Don Wilhelm-4]

RC,

Telex made headsets for a wide variety of applications.  A Google search
show it to be an aviation type headset and alsoseems to indicate that
the microphone is a dynamic type and the phones have a 500 to 600 ohm
impedance.
The microphone should work fine with the K3, but the relatively high
impedance phones may not work as well.  Try it and see if you like it.

73,
Don W3FPR

Robert 'RC' Conley wrote:

> I have been given a TELEX head set.
> I wish to know more about it.
> Impedance? Microphone type?
> Can it be used with my K3?
>  MRB 2400
> WT. .94 LBS
> MPLS. MINN
> FAA TSO C57 & C58
> CAT.-B
> RC kc5wa
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> ------------------------------------------------------------------------
>
>
> No virus found in this incoming message.
> Checked by AVG - www.avg.com
> Version: 9.0.709 / Virus Database: 270.14.85/2532 - Release Date: 11/28/09 02:45:00
>
>  

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[Roger Steyaert, K7RXV]

This headset is designed for aircraft use. The microphone has an
amplifier designed to simulate a carbon mike. Carbon mike were the
standard for all aircraft use until the late 60's. At that time they
were replaced with dynamic elements and amplifiers that worked with the
old carbon mike circuits including their high bias current. The standard
  impedance used in aircraft is 500-600 ohms. The amplifiers in aircraft
are designed to drive this impedance.

Part of my working life was designing these system in general aviation
aircraft.

Roger Steyaert K7RXV


Don Wilhelm wrote:

> RC,
>
> Telex made headsets for a wide variety of applications.  A Google search
> show it to be an aviation type headset and alsoseems to indicate that
> the microphone is a dynamic type and the phones have a 500 to 600 ohm
> impedance.
> The microphone should work fine with the K3, but the relatively high
> impedance phones may not work as well.  Try it and see if you like it.
>
> 73,
> Don W3FPR
>
> Robert 'RC' Conley wrote:
>> I have been given a TELEX head set.
>> I wish to know more about it.
>> Impedance? Microphone type?
>> Can it be used with my K3?
>>  MRB 2400
>> WT. .94 LBS
>> MPLS. MINN
>> FAA TSO C57 & C58
>> CAT.-B
>> RC kc5wa
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>> ------------------------------------------------------------------------
>>
>>
>> No virus found in this incoming message.
>> Checked by AVG - www.avg.com
>> Version: 9.0.709 / Virus Database: 270.14.85/2532 - Release Date: 11/28/09 02:45:00
>>
>>  
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>

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