No subject

not properly adjusted. This control is located behind the left front panel.
Don't mistake it for the carrier null control. If this control has been
incorrectly adjusted, one sideband will be higher in output than the other.
The object is to have both sidebands output the same amount. What this
control actually does is vary the plate voltage on the sideband generator
tube. The idea is to get both generator's plate voltage to be the same for
equal output. If one tube's plate voltage is more than the other, output
will be higher on one sideband than the other.

You also did not say what position you had your MIC/CW gain control. Also
what microphone are you using? A D-104, unamplified, works very well with
the HW-101.

What version of final tubes are installed in your HW-101? What I mean by
that is, are they plain 6146 (no letter suffix) or 6146A's or are they
6146B's or 6146W's? Hopefully they are plain 6146's or 6146A's. If not I
strongly recommend you replace them with plain 6146's or 6146A's. The
6146B's and 6146W's are very difficult to neutralize in a final amplifier
that's designed around the plain 6146 or 6146A which a lot of HW-101's are.
You can easily check if your HW-101 needs to be neutralized by performing a
simply "tuning" check. Use a dummy load with an SWR meter between the 101
and the dummy load with the SWR meter switched to "FORWARD". The SWR meter
is used as an output indicator. Place the 101's meter in PLATE position.

1. In tune mode, adjust MIC/CW level for an increase on the meter and
adjust the HW-101's preselector for maximum plate current.

2. Quickly adjust the plate control for minimum plate current. This is
the "dip" and ensure you are at the maximum dip. Note the plate current
reading and also note the SWR meter reading. The actual power output in
watts, whether it's correct or not, is not important. The idea is to note
the reading at this point. Unkey the transmitter to allow it to cool. Write
the readings noted on the HW-101's plate meter and SWR meter on a piece of
paper.

3. With the HW-101's front panel meter still in the plate position, key the
transmitter and slowly rotate the plate control while watching the SWR
meter. Is the SWR meter reading increasing? If so continue rotating the
plate control until the SWR meter reading just starts to decrease. Note the
reading and also note the 101's plate meter reading and unkey the
transmitter.

Compare the 101's plate reading in step 2 against the reading in step 3. If
the readings obtained in step 3 are much higher than in step 2 the final
requires neutralizing. However, if the readings in step 3 are only slightly
higher then in step 2, more than likely the final does not need
neutralizing.

73's,

Mike
W5RKL

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