[Boatanchors] Boatanchors Argosy II needs work
Roger Ruszkowski
flowertime01 at wmconnect.com
Wed Aug 8 17:13:03 EDT 2012
Fellows,
My Ten Tek Argosy II looks to have given up the finals.
Are the transistors still available?
Motorola MRF 476 and MRF 477 's.
It looks like the board has some surface mount capicators.
The caps look like early models about 1/4 square.
Can one reasonably do a replacement of the power transistors on the PC board?
What else mite I need to know before I start in on the repairs?
I have the Ten Tec PDF file from the web for the transceiver.
The unit pulls well over 300MA when it should only pull 125 MA.
Total power output is only about 10 watts on the external meters.
And the internal meter like wise.
After some transmit time the out put will shut down.
I expect the thermals go over temp and do the shut down.
I see QTH has a Ten Tec reflector. I read the last 10 years
of archives and did not find any threads about replacing the
finals.
Does Ten Tec still support the Argosy II?
I am not sure I understand the manual for Final Amplifier 80804-D
The manual says I need 200ma quiescent bias.
Is this in CW mode with the key up?
In CW with the key up my bias is zero.
In CW with the key down the current draw is about 2 amps. (2 x 12 is only 24 watts)
Thanks
Roger Ruszkowski AI4NI
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