Some have stated adding a capacitor across the meter will help reduce meter bounce. Others

have stated changing R104, V3's 22K 1 watt screen resistor, to 22K 2 watt. Adding a capacitor

across the meter terminals or changing R104 from a 1 watt to a 2 watt resistor will have no affect

in meter bounce.

Meter bounce is primarily a mechanical issue. Naturally a circuit the meter is connected to where the

voltage decays rapidly or slowly to zero will have an affect on meter bounce. In this case the SB-102

RF output, GRID, HV, and PLATE meter circuits will have a rather rapid voltage decay to zero than the

slow decaying voltage in the receiver AGC and transmitter ALC voltage circuits.

I performed a simple rapid decaying voltage test using a couple of Heathkit HW-100/101 and SB-400/401

meters. Both meters have the exact same electrical specifications, 1ma at 100 ohms, as the SB-100/101/102

meters have. I used a 6.15VDC lantern battery and a series meter multiplying resistor of 6.5K. The tests

were perform with and without a 0.0047ufd disc capacitor connected across the meters. The meter

multiplying resistor was calculated using Ohms Law formula

R = E / I

where

"E" is 6.15VDC

"I" is 1ma

6.15 / 0.001 = 6,150

I didn't have a 6,150 ohm resistor so I used the next "highest" value resistor, 6.8K. Don't use the next "lower"

value as that will result in a higher current flowing through the meter which could damage the meter coil.

Click the link below to watch the meter tests I performed showing meter bounce with a rapid decay of voltage

from the meter circuit.

http://w5rkl.com/wp-content/uploads/2018/12/HW101-Meter-Bounce-Test.wmv73

Mike W5RKL

www.w5rkl.comRMC(SW) USN RET