Dear Jim
I am running a markV since june 2002.
I have been running several + 24 hours contests. The cq ww and wpx rtty in
LP is allowing 150 W level and then the cooling system is at max. but the
radio does handle it for hours and hours.
e.g. in the last cq ww rtty I have been operating 41 hours at this powerlevel
: running and S & P .
Even at 50 w the cooling fins becomes warm and the fans start to roll at 40°C.
It has also do with the idling current of the finals the finals draw current
even without a single watt rf output.
e;g. in class A the finals are drawing 10 A at idle thats 300 W
dissipation wtihout any watt rf output !!! Then the heat sink becomes hot
without output.
The mark V handles 100 W at 100 % duty cycle , 200 W at 50 % duty cylcle
(manual specifications)
it is a solid performer no doubt !! The finals are two BLF147 with
each 220 W dissipation , rated at 150 W output each, so the Yeasu engineering
dept. has well built the finals with good IMD and long term use in mind.
The power supply is rated a 450 W.
Only Yeasu has not found a solution for quiting the fan in the 1000 series.
Before this mark V I used a ts850 s a solid performer in rtty. Only my
power supply could not handle the heavy duty rtty, so I added a external
cooling fan on the ps.
DIRK
ON4ADZ
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