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Re: [Amps] Alpha 87A Blower

To: amps@contesting.com
Subject: Re: [Amps] Alpha 87A Blower
From: Jim W7RY <jimw7ry@gmail.com>
Date: Fri, 14 Jan 2022 19:48:07 -0600
List-post: <mailto:amps@contesting.com>
Just push it onto the shaft.

73, Jim W7RY


On 1/14/2022 11:28 AM, Charlie Young wrote:
Three years ago I acquired by trade an Alpha 87A with a defective blower.  This 
was to help a friend who did not want to hassle with the Alpha any more because 
he had just replaced this blower within the last year or two.  The Alpha was 
surplus to my needs but I have decided to repair it.   When I got the amp, I 
tried to get a blower from Alpha but the OEM unit was unavailable.  They 
recommended a Dayton generic replacement motor, which needed to be modified.  I 
have the new blower they recommended.  In addition I purchased from Alpha a new 
rotor to go on this motor shaft.

This plastic rotor is made by Advanced Air in Florida.  It comes with a compression 
ring around the central hub where the 3/8” shaft goes through.  The rotor is a 
compression fit on the shaft.  I have not attempted to install the rotor on the shaft 
yet.  Has anyone done this install?  My plan is to heat the rotor with a heat gun and 
try to press it on the shaft.  I think the compression ring, if removed, would be a 
bear to reinstall down inside the motor housing, so I am inclined to leave it in place 
and just heat up the whole thing.   Any guidance before I attempt this rotor install 
on the motor shaft?

This blower is a bear to access.  It is tempting to rear mount a blower and be done 
with it, since the amp is for my own use and I don’t care about reselling it.  
Anyone done that.  I think it would be relatively simple.

Thanks.

73 Charlie N8RR

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