SGC SG-235 compared to Screwdriver

SGC SG-235 compared to Screwdriver

Post by Murray Neec » Thu, 13 Apr 2000 04:00:00

Hi Brian and group, do you feel this is as effective for mobile and a
good screwdriver antenna?  you cant get the loading coil above the roof
but does that matter?   Im using hamsticks on my motor home , would like
to have something automatic...all so wonder if it will handle 700 watts
ssb ok?  Thanks Murray


> FS: SGC SG-235 500w Automatic Antenna Tuner

> Reluctantly selling my SG-235 500w automatic
> antenna tuner covering 160-10m.  Tunes about
> any wire or whip.

> Used this year on 160 and 80m only.
> This is a fabulous and very versatile piece
> of gear.

> $650

> --

> --

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SGC SG-235 compared to Screwdriver

Post by Brian Sho » Fri, 14 Apr 2000 04:00:00


Murray and all,

I never used the SGC-235 with a whip type antenna or mobile.

It was used with a long sloping wire over elevated radials
with an SGC cube amplifier (500w).

I do use a SGC-231 100w 160-6m tuner in my pickup with a
standard "CB" type whip.  It works 80-6 automatically. As
I rarely use HF on the go (occasionally on 10m or 17m) I
can't compare it to a Screwdriver type antenna.

We will soon have electricity at our desert property, so I
am switching to a 1kw+ tube amplifier (as Murray knows) for
weekend contests. This is why I first sold my "cube" and now
the SGC-235.

By the way, the SGC-235 is spoken for, just awaiting $$$ and
I will be sending it out.

The SGC tuners are reversible L-network type tuners though
automated by the microprocessor.

Hope that helps a little.

73, Brian


> Hi Brian and group, do you feel this is as effective for mobile and a
> good screwdriver antenna?  you cant get the loading coil above the roof
> but does that matter?   Im using hamsticks on my motor home , would like
> to have something automatic...all so wonder if it will handle 700 watts
> ssb ok?  Thanks Murray


> > FS: SGC SG-235 500w Automatic Antenna Tuner

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SGC SG-235 compared to Screwdriver

Post by Mark Keit » Fri, 14 Apr 2000 04:00:00


> Hi Brian and group, do you feel this is as effective for mobile and a
> good screwdriver antenna?  you cant get the loading coil above the roof
> but does that matter?   Im using hamsticks on my motor home , would like
> to have something automatic...all so wonder if it will handle 700 watts
> ssb ok?  Thanks Murray

Dunno, seems like expensive impedance matching for a screwdriver.
Getting the loading coil above the roof when using a motor home can make
a difference. But mileage may vary. An elevated coil improves the
current distribution though the whip. All short whips have maximum
current at the base, but a center mounted coil will improve the
distribution up to the coil level. You will have more radiation from
that level on the whip with a center loading coil, rather than a base
loading coil. If you have metal next to the whip for most of the way up,
having the coil above the roof a bit can help. How much?, dunno , would
have to test. But, if you don't mind the price, I guess the sgc would be
a bangup matcher. But, I would still want loading coils in the antenna
to resonate. I wouldn't try using an sgc with just a whip alone. It'll
work, but not as good as using a loaded antenna. This would be no
problem with a screwdriver. MK
--
http://web.wt.net/~nm5k
 
 
 

SGC SG-235 compared to Screwdriver

Post by Gary - KJ6 » Sat, 15 Apr 2000 04:00:00

I'm assuming you're asking if the SGC is as GOOD AS the screwdriver
antenna for mobile operation. I have BOTH, and let me assure you that
while the SGC is EXCELLENT in tuning a decent end-fed wire, it is not
NEARLY as efficient in pure mobile operating with typical 8 ft. or
shorter whips - by a factor of 10 db. on the lower bands!

I use the screwdriver while in motion, towing our RV, but toss up an
appropriate wire at destination, and load it with the SGC for signal
reports that rival my home-base antennas...

--
Gary - KJ6Q
====================
The fable,"The grasshopper & the ant", reveals the
existance of socialist attitudes - even in Greek times...
"Play today - live off your neighbor tomorrow..."


> Hi Brian and group, do you feel this is as effective for mobile and a
> good screwdriver antenna?  you cant get the loading coil above the
roof
> but does that matter?   Im using hamsticks on my motor home , would
like
> to have something automatic...all so wonder if it will handle 700
watts
> ssb ok?  Thanks Murray


> > FS: SGC SG-235 500w Automatic Antenna Tuner

> > Reluctantly selling my SG-235 500w automatic
> > antenna tuner covering 160-10m.  Tunes about
> > any wire or whip.

> > Used this year on 160 and 80m only.
> > This is a fabulous and very versatile piece
> > of gear.

> > $650

> > --

> > --