{Collins} Re: KWM2A Microphones



600 ohms is considered hi-z but all mics vary in output depending on the
microphone element used.  And also frequency response.  Some higher output
than others and some "tuned" for ssb communications and others for wider
frequency response.  Just crank up the mic gain on your KWM2.  On some mics
I have it wide open!   Van, K7VS


----- Original Message ----- 
From: <XE1YZY@xxxxxxx>
To: <collins@xxxxxxxxxxxxx>
Sent: Thursday, October 21, 2004 8:25 AM
Subject: {Collins} KWM2A Microphones


> Hi to all...
>
> I about to finish the restoration of my KWM2A, the radio is now  working
very
> good, my last problem is find the right microphone, the manual says  "
High
> Impedance microphone" but how much is that?.
>
> I test the radio with a Normal Z microphone, about 600  Ohms, and speaking
> normaly I only have 40- 50 Watts in the output, if  Im speak loud, the
KWM2A
> reach 100 Watts.
>
> Maybe I can use a  microphone preamplifier, but Im afraid about
overloading
> the first microphone  amplifier, or maybe Modify the  input in order to
> accept a low Z microphone ( but my "purist " soul refuses to  make that hi
hi).
>
> Thanks in advance!
>
> Pedro XE1YZY
>  México City.
>
> Sponsored by the Collins Collectors Association
http://www.collinsradio.org
> Nets: Tues: 3.805 Mc-2000 Central / Thur: 3.875 Mc-2000 Central
> Fri: 3.895 Mc-2000 Pacific / Sun: 14.263 Mc-2000 UTC
> 1st Wed (of the month) AM Net 3.880 Mc-2000 local (ET, CT, MT, PT)
> Sun AM Net: 29.050 Mc-1200 Central
>
>

Sponsored by the Collins Collectors Association http://www.collinsradio.org
Nets: Tues: 3.805 Mc-2000 Central / Thur: 3.875 Mc-2000 Central
Fri: 3.895 Mc-2000 Pacific / Sun: 14.263 Mc-2000 UTC
1st Wed (of the month) AM Net 3.880 Mc-2000 local (ET, CT, MT, PT)
Sun AM Net: 29.050 Mc-1200 Central






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