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Author Topic: Why do people take "minutes" to tune up?  (Read 3446 times)

Posts: 7

« Reply #15 on: October 27, 2005, 07:23:51 PM »

Hi all you Ham curmudgeons.  I don't tune up on the air, so at least one person exists.  I'd be willing to bet that most of the on air tune up is just due to a lack of understanding.  The Ham classes I have seen don't cover that.  If you're on the ball you will pick out the part about not causing interference, but hay.

This is what works for me.
1.  New Ham first time only.  At the lowest power setting, adjust your tuner for the center of the band (the segment you can transmit on). Write down the settings so you only pollute the air once..  Unless your antenna has issues, this setting should be within a safe SWR for any portion of your allocated band.

2.  5 watts AM into a dummy load to set the tuner for a 1:1 match on the frequency you want to use.
Bring the amp on line and tune into the dummy load all you want.

3.  Switch to the antenna.  Using the base settings that you have written down, set your tuner.

4.  Transmit with your amp on line.  You should not need to adjust the amp at all.  As you talk, it's easy to tweak the swr.  Although you should not need much.

The assumption I'm making is that you don't drive your amp so hard that a slight mis match won't damage your tubes.  I use the 500Z and it's forgiving.

Now consider telling new Hams that a good antenna is better than an amp.   You know, the Db thing.  Also to use the amp only when needed.  Tell them about your low power work.  I did Israel Tel Aviv on 10 watts from Massachusetts.  So there!

Best regards to all.

Larry N1URE
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