[R-390] Today's Local & Line experiments

[Craig Heaton]

With quartz55's (Dave) e-mail today, I'll follow his lead and my numbers. 

One micro-volts resulted in or about -0.58VDC on TB102, 3&4

-110dBm = -0.58VDC TB102, 3&4 = 0 on the carrier meter
-100 = -.961 = 10
-90  = -2.29 = 20
-80 = -3.75 = 35
-70 = -5.12 = 45
-60 = -6.38 = 52
-50 = -7.74 = 62
-40 = -9.21 = 70
-30 = -10.66 = 80
-20 = -12.05 = 90
-10 = -13.29 = 95
0 = =14.77 = 100

Measurement were made with a HP 8640B & Fluke 27/FM. No fancy stickers
traceable to NIST

With the jumper disconnected on TB102 3&4, the resistance to ground at 3 was
534K ohms, 4 was 1.82M ohms. Measurement made with Fluke 27.

Then for grins & giggles, the AGC voltage test on the grids of tubes
connected to said line follows.

I used and old ratshack dual FET analog meter to monitor TB102 3&4 with the
jumper in place. The Fluke 27 was used for the grid measurement.

The IF section; V501 thru V503 was consistent. The meter on 3&4 was at
-6.3VDC using the above -60dBM setting. All the tubes in the IF section read
at or very near -6.3VDC using a tube extender and checking the voltage at
the grid with the Fluke 27.

The RF section might be the dirty fly in the ointment??? Once again the
ratshack meter on 3&4 with the HP 8640B cranked up for a reading of about
-6.3VDC. The Fluke was used to measure the grids. NOTE: both meters dipped
to about the  same voltage.  

V201 E208  -3.47VDC
V202 E209  -5.68VDC
V203 E210  -2.6VDC
V204 E211  -2.6VDC

I need to check the above once again with the Function switch in Standby and
check grid leak voltages: per Y2K section 5 pg 5-12.

Happy New Year 
Craig