Question (on HW-101)

[Stewart D Lyon]

On Sat, 27 Jun 1998 21:50:34 -0400 Sean Pratt <mooware at SPRYNET.COM>
writes:
>Gentlemen
>I just purchased an HW-101.   I do not have HF privilages at the
>moment, so I'm not transmiting on the air, but into a dummy load
instead.
 (In order to check out the radio)
====================================
Is the dummy load 50 ohms?? Don't assume it is -- my Cantenna measures 80
ohms! Sucks up oil over the years.
====================================
>When I went through the tune-up procedure for transmitting.  One of
>the settings call for the Meter switch to be placed in the "plate"
>postition.  When you turn the mode switch to tune. the meter should
>read at the hash mark (50mA).   It didn't happen, meter stayed at 0
>At that point I stopped, and went to the transmitter align section.  I
>set controls per specs, but could not get the meter to move in the
>"plate" position, when I adjusted the BIAS control.   However, the
>meter does move in"REL POWER" position.
=====================================
What does the RELPWR read?? At full pwr, it should read about 3/4 full
scale. Does it vary as you adjust the Final tuning and loading and Driver
adjustments?? There should be  peak on all three adjustments. You should
be able to increase the CW pot for a max RELPWR and any further increase
will not increase RELPWR. The proper setting is just below this spot.
Also measure the volts at the bias pot wiper (center connection) --  it
should read about -70V.
=====================================
>Even though I couldn't get this reading, I went ahead and set the BIAS
>control fully counter clockwise, then turned it out 3/4 turn.
====================================
Sounds about right.
====================================
>I finished to tune-up procedure using the "REL POWER" position and
>watched.  Now, when I key up, [ASSUME YOU MEAN KEY DOWN OR CLOSED] the
the HM-102 wattmeter reads 170 watts, that is going into the dummy load.
===================================
No way. Max will be about 120 Watts.  Something is really strange here.
===================================
>My question really is,  even though I can't get the meter to read in
>plate mode, do you think the radio is transmitting properly (Since I'm
>getting a reading on the wattmeter)?
===================================
Reading on wattmeter is way too high, like maybe the finals are
oscillating. But the power supply (HP-23?) fuse or breaker should have
popped.  Just for the hell-of-it, if your PS has a fuse, check it -- it
should be not larger that 4AmpSB.

BTW -- is the PS set for 300V on low voltage side (as opposed to 250V)??
===================================
>I hope the question is not as confusing to answer as it was for me to
>write. 73 Sean
==================================
Sean -- after all this, I think your real problem is just a dirty meter
switch.  Switch it back and forth a bunch of times and maybe spray some
contact in it. And there is something screwed up in your wattmeter. There
is no way a pair of 6146s will output 170 watts.
 ... one more thing, what band were you on?? I suggest you use 80 or 20
for initial tune  up. My SB-101 did strange things on 40 until I
incorporated some Heath service mods.

Hope you get your HW-101 working -- its a nice rig.
73, Stu - W6CUX
Winnetka, CA
ARRL Life Member

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