[1000mp] Very Hot Final Heatsinks

[Hans Remeeus]

When you run Class-A and decrease your power output from 75 Watts to 
20-25 Watts this will cause an extensive amount of extra heat.

Be extra careful using Class-A and don't decrease your power output when 
using Class-A!

The finals of my Mark-V (200) were blown out during a Class-A 
SSB-transmissions decreased from 75 to about 25 Watts.

73,
Hans Remeeus (PA1HR)
http://www.remeeus.nl
Communication is about people, the rest is technology.




Norm Bryant schreef:
> I purchased a new Yeasu FT-1000MP Mark-V in February of this year. The radio has seen almost ten months of service. The final heatsinks have always seemed to run extraordinarily hot but, just recently, I began using PSK-31 mode. After a normal on/off QSO that went for approximately ten minutes during which the cooling fan came on almost immediately, I measured a heatsink temperature of 143 degrees on the second heatsink from the outside. This is too hot to touch, and seems to me to be way out of line with safe operating parameters. The Yaesu technical folks said they do 'get a little toasty', but that has done little to convince me that this radio is operating safely. In PSK, I'm usually running about 20-25 watts out. I always stay on top of the SWR with both the built in meter and a secondary meter. Cooling fan comes on within 30 seconds of beginning a transmission. Output is solid, and signal reports are good. But, as far as I'm concerned, anything that gets this hot should have been labeled with a 'caution' warning.
>
> Is this a normal operation parameter for the 1000MP?
>
> Thanks,
> Norm
>
>
>