[1000mp] Cooling fan causes buzz in transmit audio on Mark V

Sat, 26 Oct 2002 08:23:56 -0000

Bruce:

I can undestand how you could get coupling to your dynamic mic from an amp
power supply, but I have not heard of anyone else with such a problem. I
personally have used a 91B on two DXpeditions, a 99 on one, and an 87A here
in the shack, all with Heil microphones, and have not encountered that
problem. So I wonder if yours might have been due to lead routing,high SWR
or a poor grounding setup.

Garry, NI6T

> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]]On Behalf Of [email protected]
> Sent: Friday, October 25, 2002 13:44
> To: [email protected]
> Subject: Re: [1000mp] Cooling fan causes buzz in transmit audio on Mark
> V
>
>
> Hi Ed,
> I would be very interested in your comments after you  install the INRAD
> click mod.
>
> Also, I wonder if there is magnetic coupling from the PS fan to
> your mic. I
> had serious coupling from my 91B amp supply to my MD-100 or any
> other dynamic
> mic. I had to switch to a capacitive electret mic.
>
> Good luck,
> Bruce  AA4Z
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