[RTTY] RTTY power levels
from [Jim Martin - MM0BQI]
Hi Jim,
Good question...
Depends if you are doing mainly S&P or CQ'ing... the duty cycle is not the same
at all...
The worst being CQ'ing for a while without reply ie 12s CQ message / 3 seconds
RX ... that's 80% overall duty cycle.
In S&P, the duty cycle is much lower,let say only 20% or less and many
transceivers will cope with it without problem... (that's equivalent to CQ'ing
in SSB).
Other factor are too be considered, like ambient temperature (not the same if
you are at peter-1st under a tent, or in XU without AC...).
Also if you have a spare tranceiver... or if you can CQ in alternance with one
or another (ie SO2R).
In general additional fans will help: ie on the 706 I used before, 25W was the
decent max for CQ'ing, going up easily to 60 with a simple flat fan blowing on
the PA radiator...
Don't know for the FT1000, but personaly with my PROII I would not try CQ'ing
for extended period at more than 50W... for search and pouncing, full power is
no problem...
But it is more a matter of personal feeling and general behavior. It may survive
long CQ periods at full power, but I don't take the risk...
(I also know hams who systematicaly blow-up something at each contest...)
73's Patrick
to: "RTTY" <RTTY@contesting.com>
Subject: [RTTY] RTTY power levels
From: "Jim Martin - MM0BQI" <MM0BQI@blueyonder.co.uk>
Date: Thu, 26 Aug 2004 08:45:04 +0100
List-post: <mailto:rtty@contesting.com>
I am running an FT1000MP Mk5 at 40w output during rtty contests and the fan
runs almost constantly and it gets hot. My understanding of the MP manual is
that I can run it at 100w out for long periods but I am not too keen to do
his! The second radio, IC7400 runs much cooler at 40w.
I see from lots of posts that operators are running 100w output from
standard rigs with great success and no damage, some guidance on this would
be appreciated!
Thanks
Jim MM0BQI
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