[1000mp] Very Hot Final Heatsinks

[Scott Manthe]

Are you running the rig in class A?

Scott, N9AA

Norm Bryant wrote:

>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
>
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