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
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