[Heathkit] Calibration of AM-2/HM-11 SWR Bridge

[Wj5mh@aol.com]

What are the normal operating characteristics of the old AM-2 or HM-11 SWR 
bridge?  My unit requires the following for full meter deflection on Max 
sensitivity:

  80 meters 88 watts
  40 meters 28 watts
  20 meters 8 watts
  15 meters 5 watts

VSWR is about 1.2:1 into a 50 ohm commercial load at the power levels above.

If power is increased to 100 watts and the sensitivity adjusted to the "set 
point," the VSWR increases to 1.5:1, indicating some non-linearity.

Are there any adjustments to be made with the bridges...other than using 
matched diodes?  Maybe changing the diode tap points on the coupler?  Have 
schematic, but no operating manual.

Thanks,
Joe


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