Home » Public Forums » GMCnet » [GMCnet] Magnet CB antenna Wilson 1000, best solutions...
| [GMCnet] Magnet CB antenna Wilson 1000, best solutions... [message #263039] |
Mon, 29 September 2014 22:00  |
gmc gmc
Messages: 69
Registered: May 2009
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Hello All, Mike here from Madison, WI. with my '78 :)
Planning to drive to FL In November. I have a good Wilson 1000 magnet mount
antenna. Thinking to put it on roof. One solution was to attach a metal
plat to roof with screws or I was thinking a good 2 part epoxy. I could
paint the metal, or a coating to prevent rust. Thinking 1/4" thickness?
2. I do have the first panel headliner coming off, so I could remove that (
another fix somehow - or change all RV headliner to something better, it is
a fabric on a thin board like material I can go look closer. ) then i
think there is foam up there? could remove foam, then gat like a 1/2" or
1/4" metal plate and attach it to the roof, and buddy says magnet will grab
hold through the roof and that is an elegant solution?
appreciate all advices.
Mike
CB I will probably make a little box for temporary mount. I like to keep it
free as antenna is as I might desire wot my it to my car or SUV for smaller
road trips.
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| Re: [GMCnet] Magnet CB antenna Wilson 1000, best solutions... [message #263062 is a reply to message #263039] |
Tue, 30 September 2014 09:31  |
gmc gmc
Messages: 69
Registered: May 2009
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so any ideas? suggestions anyone????
no one uses CB's anymore? lol
thanks Mike
On Mon, Sep 29, 2014 at 10:00 PM, gmc gmc wrote:
> Hello All, Mike here from Madison, WI. with my '78 :)
>
> Planning to drive to FL In November. I have a good Wilson 1000 magnet
> mount antenna. Thinking to put it on roof. One solution was to attach a
> metal plat to roof with screws or I was thinking a good 2 part epoxy. I
> could paint the metal, or a coating to prevent rust. Thinking 1/4"
> thickness?
>
> 2. I do have the first panel headliner coming off, so I could remove that
> ( another fix somehow - or change all RV headliner to something better, it
> is a fabric on a thin board like material I can go look closer. ) then i
> think there is foam up there? could remove foam, then gat like a 1/2" or
> 1/4" metal plate and attach it to the roof, and buddy says magnet will grab
> hold through the roof and that is an elegant solution?
>
> appreciate all advices.
>
> Mike
>
> CB I will probably make a little box for temporary mount. I like to keep
> it free as antenna is as I might desire wot my it to my car or SUV for
> smaller road trips.
>
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| Re: [GMCnet] Magnet CB antenna Wilson 1000, best solutions... [message #263063 is a reply to message #263062] |
Tue, 30 September 2014 09:47 |
Len Novak
Messages: 676
Registered: February 2004
Location: Las Vegas, NV
Karma: -3
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Mount it on the rear view mirrors?
Len and Pat
1978 GMC Kingsley
The Beast II with dash lights that work and labels you can see!
Fallbrook, CA new email: B52Rule@Roadrunner.Com
http://www.gmcmhphotos.com/photos/showgallery.php?cat=4375
www.bdub.net/novak/
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of gmc gmc
Sent: Tuesday, September 30, 2014 7:32 AM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Magnet CB antenna Wilson 1000, best solutions...
so any ideas? suggestions anyone????
no one uses CB's anymore? lol
thanks Mike
On Mon, Sep 29, 2014 at 10:00 PM, gmc gmc wrote:
> Hello All, Mike here from Madison, WI. with my '78 :)
>
> Planning to drive to FL In November. I have a good Wilson 1000 magnet
> mount antenna. Thinking to put it on roof. One solution was to attach
> a metal plat to roof with screws or I was thinking a good 2 part
> epoxy. I could paint the metal, or a coating to prevent rust. Thinking
1/4"
> thickness?
>
> 2. I do have the first panel headliner coming off, so I could remove
> that ( another fix somehow - or change all RV headliner to something
> better, it is a fabric on a thin board like material I can go look
> closer. ) then i think there is foam up there? could remove foam,
> then gat like a 1/2" or 1/4" metal plate and attach it to the roof,
> and buddy says magnet will grab hold through the roof and that is an
elegant solution?
>
> appreciate all advices.
>
> Mike
>
> CB I will probably make a little box for temporary mount. I like to
> keep it free as antenna is as I might desire wot my it to my car or
> SUV for smaller road trips.
>
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Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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Len and Pat Novak
1978 GMC Kingsley
The Beast II with dash lights that work and labels you can see!
Las Vegas, NV new email: B52sRule@Gmail.com
http://www.gmcmhphotos.com/photos/showgallery.php?cat=4375
www.bdub.net/novak/
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| Re: [GMCnet] Magnet CB antenna Wilson 1000, best solutions... [message #263065 is a reply to message #263063] |
Tue, 30 September 2014 10:33 |
tphipps
Messages: 3005
Registered: August 2004
Location: Spanish Fort, AL
Karma: 9
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Your selected magnet mounted antenna concept is not a good solution. The typical magmount relies on the metal in the automobile body to act as the "other" side of the antenna. Since you will not have a very good, if any bond to the Aluminum Roof (an excellent ground plane), the magmount at best is a compromise. I would not put any additional holes in the roof, no matter what the intention.
You would be better off attaching an antenna to the mirror mount. Select an antenna that does not need a ground plane. They are out there. Do not fall in love with the trucker's twin antennas as a solution. You cannot get them separated enough (in RF terms), using the mirror mounts to prevent them from interfering with each other. Truckers mounts are wider than the GMC and defeat this appearance solution. Further, twin vertical antennas will direct the signal along one of the axis, either the center line of the installation, or 90 degrees from the center line. This is directly related to feed line phasing.
Use good quality coax cable, remember that you are only dealing with 5 Watts and you need that power at the antenna, not wasted in the coax.
You might go to your local library and do a little digging into the ARRL's Antenna Book, especially the section on mobile operations. Plus, some excellent stuff on dealing with RFI from the vehicle into the radio. The GMC has very little RFI protection. Generally, just enough to keep whine out of the AM radio.
You could always look for a local Ham Club, and see if someone there might point you to a solution. Hams are cheap, and can find cost effective antenna solutions.
With cell phones everywhere, I'm not sure that there is much available on CB channels, other than foul mouthed people.
Tom, MS II
KA4CSG, monitoring 146.52 in the GMC.
2012 Phoenix Cruiser model 2552
KA4CSG
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| Re: [GMCnet] Magnet CB antenna Wilson 1000, best solutions... [message #263078 is a reply to message #263065] |
Tue, 30 September 2014 15:41 |
Bullitthead
Messages: 1411
Registered: November 2013
Karma: 5
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Magnet mount antennas rely on capacitive coupling to reflect the wave off of the surface they are stuck on. There is no grounding at the base of the antenna to the surface. This electrical circuit will give mixed results on different places on the same vehicle or another vehicle. Take your 1/4 inch plate and stick the antenna to it, then use some double-stick tape or other temporary adhesive to stick the plate to the roof. If the plate is big enough, just set it up there and try the CB reception and transmission. Don't drive anywhere except to get away from any buildings when testing the setup. Make sure the roof panel is grounded thoroughly, maybe even run a ground wire. See if you can get the standing wave close to 1 to 1 at both ends of the spectrum (channel 1 and channel 40). You probably won't get any better than 1.5 to 1, but that will still work. Do not have any space between the metal plate and the roof. Do not set it on the A/C, this is too far from the roof ground plane. If you get a working antenna placement, then you could fasten the plate to the roof with contact cement or a variety of adhesives that will withstand the stress. The more liquid the adhesive is when it is applied, the better grip it will have on that roof paint.
Radio waves are a little bit magical sometimes, and even though a rooftop mount almost always gives the best transmission and reception, the performance difference is not worth making any holes/future leaks in this type of vehicle (unless you are going to run some real power out of that antenna).
All that being said, the PO left a broken antenna and cable already routed to the left mirror on my coach, so I just stuck a loaded whip on there and repaired the 259 connector inside. I would love to have my CB antenna on the roof for the best transmission and reception,(and least engine noise), but the trees and carport would trash that out in short order, like the first time I forget it's up there.
Like Tom said, the twin antennas on the mirrors are not far enough apart on the GMC. Unless you get them the full 9 feet apart, field strength will be compressed fore and aft and expanded along the axis of the antennas (side to side).
If that Wilson is the one with the loading coil in the middle of it, it may not stay on with a magnet mount.
Terry Kelpien
ASE Master Technician
73 Glacier 260
Smithfield, Va.
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| Re: [GMCnet] Magnet CB antenna Wilson 1000, best solutions... [message #263093 is a reply to message #263078] |
Tue, 30 September 2014 22:28 |
Brian Waddell
Messages: 409
Registered: March 2010
Karma: -4
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Senior Member |
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I have a whip antenna about 8 ft lomg attached to the right rear bumper bracket, a short piece of rop connects to this antennae and attaches to rea AC unit with lots of slack. So the antennae is a fair bit above roof and I guess the rope keeps it from bending too far back at hwy speed or going through high stuff. PO setup...I do not know if it works but it shoulld...Brian 77 ele 455
> Date: Tue, 30 Sep 2014 14:41:33 -0600
> To: gmclist@temp.gmcnet.org
> From: mrbullitt@verizon.net
> Subject: Re: [GMCnet] Magnet CB antenna Wilson 1000, best solutions...
>
> Magnet mount antennas rely on capacitive coupling to reflect the wave off of the surface they are stuck on. There is no grounding at the base of the
> antenna to the surface. This electrical circuit will give mixed results on different places on the same vehicle or another vehicle. Take your 1/4 inch
> plate and stick the antenna to it, then use some double-stick tape or other temporary adhesive to stick the plate to the roof. If the plate is big
> enough, just set it up there and try the CB reception and transmission. Don't drive anywhere except to get away from any buildings when testing the
> setup. Make sure the roof panel is grounded thoroughly, maybe even run a ground wire. See if you can get the standing wave close to 1 to 1 at both
> ends of the spectrum (channel 1 and channel 40). You probably won't get any better than 1.5 to 1, but that will still work. Do not have any space
> between the metal plate and the roof. Do not set it on the A/C, this is too far from the roof ground plane. If you get a working antenna placement,
> then you could fasten the plate to the roof with contact cement or a variety of adhesives that will withstand the stress. The more liquid the adhesive
> is when it is applied, the better grip it will have on that roof paint.
>
> Radio waves are a little bit magical sometimes, and even though a rooftop mount almost always gives the best transmission and reception, the
> performance difference is not worth making any holes/future leaks in this type of vehicle (unless you are going to run some real power out of that
> antenna).
>
> All that being said, the PO left a broken antenna and cable already routed to the left mirror on my coach, so I just stuck a loaded whip on there and
> repaired the 259 connector inside. I would love to have my CB antenna on the roof for the best transmission and reception,(and least engine noise),
> but the trees and carport would trash that out in short order, like the first time I forget it's up there.
>
> Like Tom said, the twin antennas on the mirrors are not far enough apart on the GMC. Unless you get them the full 9 feet apart, field strength will be
> compressed fore and aft and expanded along the axis of the antennas (side to side).
>
> If that Wilson is the one with the loading coil in the middle of it, it may not stay on with a magnet mount.
> --
> Terry Kelpien
> ASE Master Technician
> 73 Glacier 260
> Smithfield, Va.
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| Re: [GMCnet] Magnet CB antenna Wilson 1000, best solutions... [message #263103 is a reply to message #263093] |
Wed, 01 October 2014 08:58 |
tphipps
Messages: 3005
Registered: August 2004
Location: Spanish Fort, AL
Karma: 9
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Brian, The long whip is the least compromising antenna choice. Being located along the body length tends to mask a portion of the radiated and received waves. However, you probably will never notice this. Reception will be best from the rear quadrant.
If it has been installed for a long time and you intend to use it, consider removing and cleaning all the connections. Use an eletronic paste to lubricate the connections, keeps moisture out. Replace the coax with the best stuff you can find. No cheap Chinese coax.
Tom, MS II
2012 Phoenix Cruiser model 2552
KA4CSG
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| Re: [GMCnet] Magnet CB antenna Wilson 1000, best solutions... [message #263248 is a reply to message #263039] |
Fri, 03 October 2014 07:00 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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The 109"whip is the best antenna for 27MHz. Interestingly, we find they're often closer to 25 ohms than 50 when mounted. And the trick cure is two tees and two equal length runs of RG58, to feed in parallel. If you don't have a bridge (very few do) try driving the antenna with one and then two feeds, and measure the field strength. Use whichever setup works best.
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: [GMCnet] Magnet CB antenna Wilson 1000, best solutions... [message #263258 is a reply to message #263039] |
Fri, 03 October 2014 09:01 |
Jim at the Co-op
Messages: 291
Registered: May 2014
Location: Orlando Florida
Karma: 2
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Alote of the new CB antennas have no length adjustment. Not many shops still even have an SWR meter and fewer know how to use it. I installed an antenna ladt week, it had a base load but had no way to lengthen or trim the mast. Chackedswr, we were 3-1. Installed 2 washers between the mast and load. Got 1.9, was not happy of course but it was all there was to do without a matchbox which I don't know if they even make anymore. Had to leave it. Should be sure there are adjustments when you buy one.
Jim Bounds
Sent from my T-Mobile 4G LTE Device
-------- Original message --------
From: Johnny Bridges
Date: 10/03/2014 5:00 AM (GMT-08:00)
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Magnet CB antenna Wilson 1000, best solutions...
The 109"whip is the best antenna for 27MHz. Interestingly, we find they're often closer to 25 ohms than 50 when mounted. And the trick cure is two
tees and two equal length runs of RG58, to feed in parallel. If you don't have a bridge (very few do) try driving the antenna with one and then two
feeds, and measure the field strength. Use whichever setup works best.
--johnny
--
'76 23' transmode Norris upfit
Braselton, Ga.
"Sometimes I wonder what tomorrow's gonna bring when I think about my dirty life and times" --Warren Zevon
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