[BC] Noisy transmitters

[Richard Fry]

Yea?  You should hear a Harris FM-25K.  I have heard UHF TV transmitters
with the heat exchanger that were quieter than that rig.  Heaven help you 
if
you have a 25K and Z series rig in the same room.  Harris has got to have
the loudest transmitters on the market now.
_________________

The old FM-25K had a noisy blower, true.  But the air system in that tx was 
redesigned over 15 years ago when switching to the 600 watt MOS-FET IPA, 
and at the same a lot of backpressure was removed from the PA ductwork. 
The blower speed/horsepower needed to cool the new layout was far less, and 
it was far, far, quieter then.

All of the Harris HT-xxCD single tube txs are considerably quieter than the 
original FM-25K, probably quieter than most others of equal power rating, 
and they have been for a long time now.

Also the Z txs start out with the blower in high speed, and then for normal 
conditions it drops to a much lower/quieter mode within 20 secs or so.

RF