>
>Dear Mr Breznek:
>
>Its been quite a while that I do not hear from you. I am so dissapointed
>that I can't use my amplifier. The overheathing protection circuit is on
>most of the time. I even mounted another fan exactly like the stock one
>piggyback besides the terrible amount of noise they make it only allows
>me e few more words untill the protection circuit tripps the amp to std
>by again. I have already received messages from other hams in ZL and VK
>who also experienced the same problem. One of them said that the new DX1
>comes with the same fan that you use in the DX2. Shouldn't mine have
>this type of fan? I received it only a month ago?. I hope you solve this
>problem for me. so far I can't belive that I spent over Two thousand
>dollars on an amplifier that is usless!!!.
>
? Jorge --cooling an axial flow anode-cooler with a fan is problematic.
What is needed is a high-pressure blower. There is a manufacturer in
Ventura, California that makes high-pressure centrifugal blowers. I
phoned them and requested a catalog. I will post the info here when I Rx
it. // According to Svetlana's spec sheet, at 7000 feet altitude, the
4cx800A appears to need roughly 0.95" of water column pressure. . //
note -- High-pressure centrifugal blowers have relatively narrow, large
diameter squirrel-cages that operate at c. 3400 rpm. // My guess is that
the designer of the amplifier did not measure the air pressure delivered
by the fan.
cheers
- Rich..., 805.386.3734, www.vcnet.com/measures.
end
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