[MRCA] April 20th Update #2 PRC-47 no transmit

[James Green]

Seems I can measure grid voltage at V1, V2 & V3 at A3J1, A3J2 & A3J3 in transmit mode. I get expected results. I still haven't found a good way to get at the plate voltages.

Items 12 thru 15 are ok

Item 15 is measuring the B+ at the power output tube. I measured this tube out of circuit by clipping my Fluke 77 positive lead to the cap lead of the PL-177 tube. The Negative lead to ground. I should get 650VDC Low power and 1,500VDC hi power. I get around 840VDC low power. When I switched to hi power I got a snap! like I did before with the PL-177 in circuit that led me to replace the Xmit power switch. I examined the switch very carefully and saw no problems. Also, the 5amp fuse in the 20 amp holder did not blow. I proceeded with the high power B+ test and discovered my fluke will not measure over 1,000 VDC so it registered OL when I measured Hi power. I will be building a test circuit with 2 equal resistors in series. Measuring the voltage drop across one of them should be 1/2 the total voltage. I want to be safe about this so I am going to think it over very carefully before I proceed.

I expect the high reading on low power will come down with the tube in circuit and a proper 50 load.