Re(2): [Mobile-Portable] Screwdriver antenna controller

[DavidE Benedict]

mobile-portable at mailman.qth.net writes:
>The noise created by the brushes gives you a signal
>to use to tune for maximum receive noise as a pre-tune
>step prior to a manual final touch-up for minimum 
>reflected power!!!  As I wrote earlier, there is no
>need for fancy gadgets.  Most of the tune-up plug-in
>devices will only key your 706 for about 10-15 seconds,
>which is definitely not long enough to move to or from
>75 meters.  It takes approximately 30 seconds for my
>High Sierra HS-1500 to get between 75 and 40 meters.
>I can see that the VSWR-sensing auto-tune devices might
>be useful between 40 and 10 meters, though.
>
>I also suspect that tuning under power, even at just
>10 Watts, might adversely affect the life of the antenna,
>even if only minimally.
>
>K.I.S.S., folks!
>
>(;-p)
>
>73  ---  Mac, K2GKK/5


Part of this doesn't seem right to me, Mac...

What I always have tuned for is max noise on the particular freq that I am
have selected... that's resonance. When I have done that w/ my
screwdriver, the freq noise I am looking for is masked by the brush noise,
and that brush noise makes it more difficult to discern the increase in
freq noise. I think that suppressing the brush noise of the screwdriver
motor will enhance that tuning-by-noise process.

On another note... my Larry's antenna doesn't take so very long between 75
& 40  (it's definitely there within the time of the Tune feature of the
706) but between 75 & 160 is a looong road.

David B.
W7DBH
Oregon