[Mobile-Portable] New car and considering new antenna
setup! Followup
[email protected]
[email protected]
Sun, 09 Mar 2003 12:49:02 -0500
I personally use an Alinco and I have the comet antenna. I bought a
gadget from MFJ (by suggestion of a list member)which is installed on
the cable two feet from the antenna base, and has a selector, My
reports are all really good, have done DX with great results..
Jimmy
HP1HEW
----- Original Message -----
From: "David E. Shelton" <[email protected]>
Date: Saturday, February 9, 2002 11:32 am
Subject: [Mobile-Portable] New car and considering new antenna setup!
Followup
> Thanks to so many that replied to the post. I have still not
> decided what to
> install but I am leaning heavily towards another Screwdriver antenna,
> probably the Hi Q brand as its construction is far better than the
> rest of
> the screwdrivers out there. I do know from practical experience
> that the
> larger the coils, the higher the Q, and in general larger physical
> size is
> an advantage over smaller antennas whether center loaded or top
> loaded. This
> puts the advantage in the screwdriver's favor and if you add a
> capacitancehat of any size there is less need for the coil, giving
> the antenna better
> physical characteristics. Another thing that no one mentioned the
> loadingresistance of the antenna, 0 ohms is best most should agree
> on this,
> screwdriver antennas have low impedance at the feed point
> typically around
> 0-10 ohms. The diamond and comet are at 50-52 ohms when tuned
> properly. Yes
> the screwdrivers typically have a transformer that is used to
> match the
> rig's feed line needs 50 ohms to the antenna, say 6 ohms with an 8:1
> transformer that's 48 ohms matched at resonance. I again must say
> I like the
> diamond/comet's lack of moving parts this is the weak link in the
> screwdrivers design and also the advantage it has. Very nice to be
> drivingdown the road and change bands and portions of the same
> band without
> utilizing a tuner or getting out of the car, but with motorized
> antennascomes reliability issues. I am glad to be back on this
> list/reflector, it
> has been a long time since I read or participated here, thanks
> again to you
> all!
>
> David E. Shelton, RN
> [email protected]
> [email protected]
>
>
>
>
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> http://mailman.qth.net/mailman/listinfo/mobile-portable
>
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