[AMPS] AL-1200 Blower

[Brakob, Hans]

The exhaust is vented just like most other amps, via
grille-work directly above the tube chimney.  The
cooling seems perfectly adequate (I run mostly CW),
but would be nice to be able to quiet that fan down
a little.  Since the fan is variable speed (albeit
"variable by moving a wire to one of four taps") 
maybe someone has figured out an automatic switching 
system based on internal temperature?

73, Hans, K0HB


-----Original Message-----
From: measures [mailto:2@vc.net]
Sent: Wednesday, December 06, 2000 12:14 PM
To: w7ti@jps.net; Brakob, Hans
Cc: 'Amps@contesting.com'
Subject: Re: [AMPS] AL-1200 Blower


>
>On Wed, 6 Dec 2000 09:48:45 -0600 , Brakob, Hans wrote:
>
>>Just installed a new AL-1200 yesterday.
>>The blower is kinda loud, like sitting in the back row of a DC-9 with full 
>reverse thrusters.
>>I notice the blower has wiring options for 4 speeds (it comes wired for 3rd 
>gear).
>>Has anyone rewired for lower speeds and used the amp for contesting?  
>_____________________________________________________________________
>
>I can only offer some advice if you're planning on using the AL-1200
>for RTTY.  I had one several years ago and smoked the 80/160 tank coil
>twice while RTTY contesting.  IOW, the AL-1200 cooling is marginal for
>full-power, full-carrier operation.  I'd be careful about reducing the
>fan speed.  After replacing the tank coil, I held it to less than 1 kW
>out and had no problems.  
>
>The problem is that the exhaust air from the tube is dumped into the
>cabinet rather than being vented outside. .....

Incredible

end

-  Rich..., 805.386.3734, www.vcnet.com/measures.  
end

--
FAQ on WWW:               http://www.contesting.com/FAQ/amps
Submissions:              amps@contesting.com
Administrative requests:  amps-REQUEST@contesting.com
Problems:                 owner-amps@contesting.com