Yeah, I just hate it when my 3CX6000 amp kicks out from too much grid drive.
Chas
----- Original Message -----
From: "kd7gc" <kd...@q.com>
To: <elecraft@mailman.qth.net>
Sent: Thursday, August 28, 2014 12:22 AM
Subject: Re: [Elecraft] Tuning your radio and amplifier to your amtenna
Hello Jim, In major part I agree with your suggested method for tuning up
and amp, but I would never begin my tuning with an output from my
transceiver of 4 watts. I have never heard of anyone suggesting that
tuning
should begin with anything close to 4 watts. I generally go thru 3 or 4
steps, but I start with my transceiver set to about 25 or 30 watts output.
I bring my drive up in say 3 or 4 increments until I reach my desired amp
output, usually in the range of about 60 or 70 watts of drive, at least
for
smaller amps. However, when I tune up my Henry 5K I don't exceed about 45
watts of drive because I would already be over 1500 watts out. At 70
watts
of drive I would be running over 3KW, or 3.5 KW on 40 or 75 meters.
HTH
Alan R. Downing
Phoenix, AZ
From: hf4me [via Elecraft]
[mailto:ml-node+s365791n7592596...@n2.nabble.com]
Sent: Wednesday, August 27, 2014 7:15 PM
To: kd7gc
Subject: Tuning your radio and amplifier to your amtenna
Manual tuner - Manual amplifier:
Or, any tuner and amplifier - tune with low power and radio only to start.
I don't use "tune" unless I am using the internal tuner. Set your tune
power setting to 4 watts, place your amp in standby, press xmit (xmit
only,
not tune) get your tuner properly adjusted, press xmit to release, turn
your
power output down to 4 watts, enable your amplifier, place your radio in
CW
mode, tune to a frequency CLOSE to where you want to transmit - NOT on top
of other QSOs, use your CW key to cause the radio to transmit, tune your
amplifier and refine your tuner settings, let off the key every few
seconds
to not heat up everything, if your are happy with the current settings,
increase your power out slowly as you watch it on each increase until you
have achieved the output power you are looking for.
1 lower your output power
2 Transmit only a few seconds at a time
3 Find an unused frequency - close is plenty good
4 Tune with your radio without any amp
5 When happy, enable the amp
6 Adjust settings
7 Increase power slowly
8 Readjust if necessary.
9 Tune to your target frequency
73, Jim
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