: [Drake] Questions from new a ham (long)

[R.J. Keller]

Jeff,
I am not trying to be insulting or simplistic here, but you may be
making it too difficult for yourself. It is good to ask lots of
questions because that is how we all learn, but let me help a bit
here.

First. get a dummy load and load the transmitter into the dummy load
according to the manual. With a perfect (almost) load, everything
should work according to the manual if the rig is up to par and has a
decent alignment.

Second, use your '259 and adjust the antenna with your tuner for
minimum SWR, must be less than 2:1 for reasons others will expound on,
but simply it can damage the finals if SWR is higher.

Lastly, hook up the rig to the tuner and antenna and briefly key the
rig in the tune position (X-CW I believe) using only enough drive to
see a power-out indication on your wattmeter (10-20W) and quickly
check the plate tuning for minimum (yes, you will see one now).

If the SWR is over about 1.5:1 you should tweak the load control for
max power.

That's it! Now you can get on the air and in your spare time study up
on all the good info you will receive from others and the ARRL
Handbook or other printed publications you can get  your hands on.
Also, DON'T FORGET TO KEEP ASKING QUESTIONS!

Have fun, good luck and 73, Dick KF4NS
Keep the glow!



Message: 1
Reply-To: "Jeff Anderson" <jwanderson@favorites.com>
From: "Jeff Anderson" <jwanderson@favorites.com>
To: "DRAKE List" <drake@mailman.qth.net>
Date: Wed, 11 Sep 2002 12:09:36 -0600
Subject: [Drake] Questions from new a ham (long)

I'm looking for some information on basic transmitter operation.  I am
posting these questions here because I would like input from people
that
understand the tuning of tube finals, and manual antenna tuners.

I have had my license for nearly a year, but have yet to get on the
air and
actually speak to anyone.  I have worked on tube receivers for many
years
(beginning with R-390s while in the Navy), but have no experience with
transmitters.
My station consists of a TR-3 (a hamfest unit that required lots of
work)
with a D-104 mic, an L network tuner that I built (has no tuning
indicator),
and a G5RV antenna that I recently put up.  I also have an MFJ 259B
antenna
analyzer, the W-4 watt meter, and some no-name inline SWR meter that I
can
use to help me get things set up.

Most of my questions involve technique for proper matching of the
transmitter to the antenna.

1.  Must the antenna be accurately tuned before tune-up of the TR-3 is
attempted?
2.  Will the tuning of the antenna effect the tuning of the
transmitter?

Using the MFJ analyzer, at the point where the feedline connects to
the
TR-3, I have verified that the tuner will match the antenna with an
SWR of
less than 2:1 on all bands.

3.  Is the use of an inline SWR meter the proper method to ensure
proper
antenna tuner adjustment in a normal station setup?
4.  The W-4 watt meter will display forward and reverse power, but it
seems
to require the use of a lot of forward power to get usable meter
movement
when viewing reverse power.  Is this not the proper device for antenna
tuner
adjustment?
5.  Is there any way to verify proper adjustment of the antenna tuner
using
the plate current meter on the TR-3?

With regard to TR-3 tune up, the thing I have the most concern about
is:

6.  How fragile are the final tubes????

The manual states not to allow more than .1 amps of plate current for
more
than 30 seconds or so, or the finals could be damaged.  Is this due to
the
high SWR that could be present during tune up?  I don't want to damage
the
finals (they did cost a lot), but 30 seconds isn't very long to tweak
all
the knobs that need to be tweaked.

The TR-3 tune-up procedure calls for dipping the plate current, and
maintaining the dip while adjusting the LOAD control.

7.  What does it mean if I can't find the dip in the plate current, or
if
the dip seems to be all the way to one end of the PLATE control range?
8.  Do the proper adjustments of the PLATE and LOAD controls
correspond to a
peak power out indication on the W-4 watt meter?

After all this, it seems quite easy to get LOTS of output power (as
displayed on the W-4 watt meter) while performing the tune-up in X-CW
mode
as specified.  But after tune-up is complete, and the function switch
is
returned to the SSB position, the watt meter displays very little
output,
the plate current meter moves very little, and the S meter doesn't
move at
all when speaking into the microphone.
If the XMTR GAIN control is increased, I can get higher output
indications
while in SSB mode, and get the s-meter to move.  I believe that this
indicates that the transmit AGC is working, and that XMTR GAIN is
adjusted
for maximum output.  The output meter still doesn't indicate very much
while
set to operate SSB.

9.  If the plate current meter displays reasonable plate current while
in
the X-CW mode, is this an indication of proper operation of the
finals?
What are the indications of weak finals?

Well, thanks for reading this far.  I will appreciate any help you can
give
me.  I would like to make my first QSO some time in the not too
distant
future.  If I can gain confidence that my station is configured and
operating properly,  I should be on the air soon.
It would probably be better to reply off the list.  The fewer times
this
novel travels around the world, the better.

73,
Jeff Anderson  KD7PAW