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Re: [Amps] Centrifugal Blowers

Subject: Re: [Amps] Centrifugal Blowers
From: Roger - W7TZ <>
Date: Thu, 27 Jan 2022 10:34:19 -0800
List-post: <>
I use an RV Sewer Kit plus a square flange interconnect and quick
disconnect. I put the blower in a sealed box with one side filtered and
located in the attic and brought the hose out of the ceiling to my rack
mounted rf decks for v/uhf.

73, Roger


On Thu, Jan 27, 2022 at 4:23 AM Rob Atkinson <> wrote:

> First, thanks to Paul W9AC and John K5PRO for their accounts.  I
> worked at a FM near Memphis about the same time that was also a 3 KW
> with 3 rototillers at 300 feet fed with pressurized heliax.  That must
> have been a standard configuration FCC licensed for small markets.  I
> don't remember the tube but our rig was a Harris and someone had
> placed a box fan laying flat on top of the cabinet and I was told the
> idea was to help pull air up out of the rig.
> New blowers have gotten expensive, what a surprise, and I've managed
> to get by so far with some hamfest finds.  I think there are some
> cheap ones sold on-line from China but as with tubes, I don't know
> about the quality.  But I wouldn't be surprised if Daytons are no
> longer made in Dayton, hi.  I am using a large blower removed from a
> Sparta 701 AM broadcast rig that was wound to run on 230 v. but I've
> put 120 across it which slows it down and quiets it.  One set of
> bearings is shot because it only runs smoothly when resting on its
> side with the motor facing up.  It's big enough so that on 120 v. it
> still pushes plenty of air for a single 4-1000 using the black plastic
> socket.  It rests on an upside down plastic paint bucket with the
> bottom cut out and holes cut in the side of the bucket so air comes in
> and up through the wheel and out.  Like the other fellow, who remoted
> his blower, I am using flexible vinyl dryer duct to the rig.  The
> blower outlet is a square flange.  I went to a hardware store and
> purchased aluminum gutter sections that have the drain collar that a
> downspout can push on to.  I cut out the collar with enough gutter
> aluminum sheet to make a square around the collar, and punched bolt
> holes in the corners that lined up with the bolt holes on the blower
> flange.  Using silicone sealant I bolted the collar onto the flange,
> giving me something to jam the dryer duct over and fasten with a hose
> clamp.  I used the same method on the RF PA chassis also.
> 73
> Rob
> K5UJ
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