> REPLY:
> Aren't Eimac's data sheets for 100% duty cycle?
The data sheet specifies "CW or PEP" and does not give any pulse
duration specifications. By definition PEP can't be 100% duty cycle.
One could do a lot of mathematical gymnastics comparing RTTY to SSB
or CW but CW transmit is what, 60% duty cycle ... even heavily clipped
SSB has around a 6 dB "crest factor" (peak to average ratio) while
RTTY is 100% duty while transmitting. Even with the same proportions
of transmit vs. receive time RTTY will generate as much as 4 times
the heat as either CW or SSB without even considering the effects of
cooling lag (ability to move the heat out).
73,
... Joe, W4TV
On 9/24/2012 4:34 PM, Bill, W6WRT wrote:
ORIGINAL MESSAGE:
On Mon, 24 Sep 2012 15:49:26 -0400, W4TV wrote:
600W output is close to the safe CW output! Eimac's data sheet gives
600W CW or PEP as the "useful power output" for a single 3-500Z with
2500V on the plate.
REPLY:
Aren't Eimac's data sheets for 100% duty cycle? I don't have an exact value for
RTTY contesting but I would guess the worst case is a string of unanswered CQs
at around 80%.
I agree however, it wouldn't hurt to drop it back to 400-500 watts RF out or so.
At the receiving end they probably would not notice the difference.
73, Bill W6WRT
_______________________________________________
RTTY mailing list
RTTY@contesting.com
http://lists.contesting.com/mailman/listinfo/rtty
_______________________________________________
RTTY mailing list
RTTY@contesting.com
http://lists.contesting.com/mailman/listinfo/rtty
|