Scanner Antenna questions

Scanner Antenna questions

Post by Dennis Wenge » Tue, 07 Apr 1998 04:00:00

Can someone repost the info on turning a TV antenna into a scanner antenna
?

Also, is it possible to ..."intermingle" (don't know the correct term) a
scanner antenna WITH a TV antenna, for the betterment of both, or would it
only deteriorate both ? If they can be used jointly, how would they
connect, since I cant find a RG-58 to "F" adapter in my RS catalog.
Different wiring on the scanner ?

One more question. I would like some other sources for scanner antennae's,
other than RS and Scanner World, which both seem to have a very limited
selection. Other sources, preferably with Internet Websites
would be appreciated.

 D. Wenger
--

(remove the band for e-mail return)

 
 
 

Scanner Antenna questions

Post by Neutrody » Tue, 07 Apr 1998 04:00:00


>Subject: Scanner Antenna questions

>Date: Mon, Apr 6, 1998 16:04 EDT

>Can someone repost the info on turning a TV antenna into a scanner antenna
>?

>Also, is it possible to ..."intermingle" (don't know the correct term) a
>scanner antenna WITH a TV antenna, for the betterment of both, or would it
>only deteriorate both ? If they can be used jointly, how would they
>connect, since I cant find a RG-58 to "F" adapter in my RS catalog.
>Different wiring on the scanner ?

>One more question. I would like some other sources for scanner antennae's,
>other than RS and Scanner World, which both seem to have a very limited
>selection. Other sources, preferably with Internet Websites
>would be appreciated.

> D. Wenger
>--

>(remove the band for e-mail return)

I forget the URL (it's on some unrelated site or net) but Stark Electronics has
Winegard, Channel Master & maybe one or two more.

is the best Omni I've had up in the air and the best of any sort outside of the
OLD Grove SCanner beam. Trouble is it is fragile in high ice or wind areas,
breaks off right above the bracket, especially if your support pole is limber.
     Why adapt RG-58 to anything? RG-6 is lower loss and fits 50% of the
scanner antennas sold with a standard F connector. It fits a Pl-259 connector
with the proper sleeve, or just use an "F" to pl-259 adapter.
     To use a TV antenna you mount it vertical instead of horizontal. Turn the
thing 90 degrees & drill new holes for the "U" bolts. WARNING: (nobody ever
mentions this) the wind load is  higher this way, especially if ice collects.
Use HEAVY pipe& a sturdy mount. Also, the insulators are stressed for
horizontal, not vertical. Use a SMALL antenna & don't expect it to last long.
"Swept wing" (angled log periodic) designs like Radio Shack Tv antennas are
lousy physically anyway and come apart right away when mounted vertically.
You'll need to rotate it, or point it in the serious direction of interest. The
pickup off the back & sides is worse than a simple scanner antenna. Remember
too that a 6 foot long TV antenna only gives 0-4Db of gain on low band & VHF
and maybe 5db on UHF. Not a lot, because they are so broadbanded.
     Personally I'd get a long UHF TV yagi  (which is pretty small and light &
easier to change to vertical & have it stay up a year or two) on a rotor for
*** UHF & 800 hunting & get a good omni scanner antenna for everything else.
Get a switch & pick what you need as you go .
     Using one TV antenna for both is not an option (oh it might work a bit,
but not worthwhile on one or the other): The loss when polarized wrong is about
10 db, and the biggest Tv antenna only has 6 to 8 db gain on low band, 10 or 11
on UHF. So its probably worse than you internal whip.
     I learned the above over many years of picking up shedding elements after
every wind storm. Go sturdy & go small. The last 5 feet above the rotor isn't
worth it in the long run & tighten the bolts until you are SURE they will
break, then go 1/4 turn past.