On Tue, 19 Oct 2010 12:41:23 -0400, wrote:

Well it looks like I have evidence that the problem may be the final amp
or associated circuit. In the "Adjustment mode", I checked the idle current
(transmit SSB without modulation with a current meter in the power supply line
as described in the SM. For HF/50M and 144M against a "00" setting reference
(as described in the SM), the current was higher by the specified amount
compared to the "00" reference. However, for 430M, the idle current is the
same as the "00" reference, and it can not be increase (in transmit) to the
value specified in the SM. Rotating the adjustment dial, which shows a
change in the number, has no effect on the idle current.

I will not pursue this any further at this time. I am able to use
430 MHZ SSB, but at a lower power level (around 18W).

Kinda looks like the RD60HUF1 RF output xistor might be toast. The
Vgs bias adjustment is a DC characteristic, and does not require any
RF drive to function. See Pg 2/7 which shows the Vgs to Igs graph. At
Ids=2.5A, Vgs should be 2.5 volts. You can measure that with a
volts-guesser by simply removing the bottom cover:
http://www.rfparts.com/pdf_docs/RD/rd60huf1.pdf
$29.20 from RF Parts.


--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558