Scott,
You're right, I passed with 3 errors for my Extra Class License. One of them
must have been the power limit question. Of course all my tests with the DX4
have been on the 20 kW Rohde & Schwartz dummyload in my workshop. How stupid
from me to forget to mention this in my previous posting.
Yep, Korsakov and Alzheimer are knocking on the door...
Cheers, Dick
PA3DUV
W6DUV
----- Original Message -----
From: "Scott Manthe" <n9aa@arrl.net>
To: "w6duv" <w6duv@planet.nl>; <Amps@contesting.com>
Sent: Thursday, November 01, 2007 11:13 PM
Subject: Re: [Amps] use of Emtron DX-2 during contest/expedition
>I realize that many contesters feel that power limits are simply
>suggestions, but I feel compelled to point out that 2kW output is illegal
>in the US (as well as the Netherlands).
>
> Dick, I guess you must've missed that part of the regulations when you
> were studying or your U.S. license. ;)
>
> 73,
> Scott, N9AA
>
> w6duv wrote:
>> I would suggest to run the amplifier @ it's rated 2 kW out.
>> My experience with other Emtron tetrode amplifiers is that the efficiency
>> drops significant when they run at a low output power level. The Emtron
>> DX4
>> for instance will switch to its high rev setting of the fan when used @ 2
>> kW
>> while running is at its rated 5 kW level the fan will not rev up.
>> In my view the temperature balance is reached within 1 or 2 hours, so
>> using
>> the amp in a 24 h contest or a 48 hour contest should not make any
>> difference in terms of temperature rise.
>>
>> Cheers, Dick
>> PA3DUV
>> W6DUV
>>
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