On Mon, 2007-08-06 at 15:11 -0500, Stuart Rohre wrote:
> Always tune up a rig and linear and tuner into a dummy load before applying
> an antenna. Then, you should have less range of adjustment to fine tune the
> tuner to the antenna.
Only if the antenna is near resonance. Otherwise the tuner should be
pretuned with an antenna analyzer or noise bridge or tuner tuner (fixed
Z noise bridge. The rig and linear used with that tuner should be tuned
into a dummy load and all that tuning can be facilitated by keeping a
tuning chart with good logging dials on the adjustable components.
I find peaking receive through the tuner speeds adjustments when I've
neglected to look at my tuning chart.
> And, if possible, use an antenna analyzer to make sure the tuner settings
> are either correct for the intended antenna, (separately with the linear
> disconnected), or tune the antenna using the antenna analyzer as the source.
> That minimizes the on air time of the linear while tuning up. Actually, the
> goal is to NOT tune up the linear on the air.
For sure, but when the only tuning instrument is a SWR bridge that runs
at full transmitter power, tuning on the air will be done.
73, Jerry, K0CQ,
All content copyright Dr. Gerald N. Johnson, electrical engineer
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