I mistakenly used the term CW here which, among hams, means CW morse,
and in RF power engineering terminology means key down 100% operation
for a long time - as opposed to pulsed operation.
Yes, the Herc II is rated 550 (I was incorrect stating 500) watts CW,
with 50% DF and max key down time of 15 minutes. That won't be
adequate for 24/7 operation of key down in continuous carrier
operation, so I think it might be good for 250 watts. We will test it
and see where the semiconductors become unsoldered -- hihi. Maybe I
can force cool it better. I wonder if its the RF board/combiner or
that black box power supply from Ten Tec that cannot handle the heat?
73
John
K5PRO
>According to the manual, the 420 (Herc II) is rated 550 watts output CW,
>RTTY, and SSB, 1 kW input; SSB is rated for continuous operation, CW/RTTY
>is rated for a 50% duty cycle with maximum continuous key-down of 15
>minutes. Efficiency and drive required vary a bit from one band to another.
>
>>From conversations on various email lists, I have learned that many owners
>of the Herc II use it with some P/S other than the TenTec (which they say
>is rated 100A, and designed to run both the amp and the exciter at 100w).
>One popular configuration is a deep-charge battery with a suitable float
>charger. Another is a pair of Astron 70A units (which is what I am using).
>FWIW, it should run just fine on SSB on one of the Astron 70A supplies.
>Because I mostly work CW, I use two.
>
>Jim Brown K9YC
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