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Author Topic: dk3 screwdriver ant. w6aaq design  (Read 857 times)
KB2MS
Member

Posts: 19




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« on: July 03, 2005, 09:29:39 AM »

Was wonddering if anyone has incorporated a auto tuner, such as the antenna boss or some other type tuner with this antenna.  I know the antenna can be called the tuner, as it does tune nicely, but looking for a way to just push a button, and not take Eyes off the road.
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WA4PTZ
Member

Posts: 528




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« Reply #1 on: July 06, 2005, 11:18:17 AM »

Yes, I did at first.....then I did away with the
screwdriver antenna and dettached the 60 inch whip
I had on the SD and coupled it to a Hustler antenna
54 inch mast and now I have a 114 inch whip and a
SGC 237 autocoupler which can tune 80 thru 6
without any problems. I even used the SD mount.
It saves a lot of work. Key the mic and it will set
to the appropriate memory selection that was saved.
This makes mobile operations much safer.
73 - Tim
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WB6BYU
Member

Posts: 13341




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« Reply #2 on: July 08, 2005, 02:22:31 PM »

Seems to me that Don W6AAQ also had an automatic controller
for the antenna: it would adjust for resonance using a
phase detector to see which way to run the motor.  Such
circuits have been around for a while (I seem to remember
one from the 1950's) and I suspect that other folks who
make screwdriver antennas have something similar that could
be used.

This works MUCH better than using an autotuner with a
out-of-resonance loaded mobile antenna.

Or, if you want something simpler, run the reflected power
voltage from your SWR meter to an audio oscillator, then
you can tune up by ear while keeping your eyes on the road.
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