|[AMRadio] replacing fans in BC rigs|
jtml at losalamos.com
Sat Jul 26 23:50:45 EDT 2008
My Continental 314R1 1 kW had a noisy cabinet fan from Grainger in it. Sounded like a jet taking off. It also has a squirrel cage blower for the 3-500Zs that pressurizes them from underneath. I replaced the cabinet flushing fan with a Rotron Caravel fan. It is a lot less noisy, but still too loud. I like your idea of running them off 110 V, as they have 220 VAC motors in the 314R1.
> Date: Fri, 25 Jul 2008 14:29:07 -0500
> From: "D. Chester" <k4kyv at charter.net>
> Subject: Re: [AMRadio] RE:Finaly got the "Dream Rig"
> My Gates BC1-T was far too noisy to use in the shack near the operating
> position when I first got it converted and on the air. The mod reactor
> talked back like a PA speaker, the blowers sounded like a vacuum cleaner
> running and the a.c. contactor relays sounded like a chain saw.
> I replaced the mod reactor with a potted unit that I had on hand, and it is
> very quiet. I converted the relay circuitry so that all the control relays
> run off DC. There are two blower fans in the transmitter, each with 110v
> motors, connected in series to run off 220. I moved the wire to the motors
> to a 110v tap, so that each motor now is running on 55 volts. They work
> very well at half voltage and are whisper quiet (although still audible),
> but still move plenty of air. I mounted a toggle switch to fill an extra
> hole that was on the front panel, which allows me to cut the blowers
> completely off. I have never had any problem with anything overheating with
> the fans turned off, but in warm weather or when I operate the rig for an
> extended period I usually run them, but in winter for one short QSO I
> usually turn the fans off.
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