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Thread: CB Radio
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February 8th, 2012, 05:57 PM #41
Re: CB Radio
Gloria: "65 percent of the people murdered in the last 10 years were killed by hand guns"
Archie Bunker: "would it make you feel better, little girl, if they was pushed outta windows?"
http://www.moviewavs.com/TV_Shows/Al...he_Family.html
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February 8th, 2012, 06:10 PM #42
Re: CB Radio
While many claim to support the right, precious few support the practice.
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February 8th, 2012, 06:35 PM #43
Re: CB Radio
The same as when RF is dancing across your trunk lid, roof or toolbox lid. [8^)
These are fun projects, now you're getting me in the mood for some serious antenna work.
When the RF finds the plane, the reflected power ("SWR") drops down to a usable level. I've used 3-4 wires laid out across the ground, as many ham radio operators have in the past. I have a photo of a 8' CB antenna in the middle of a grass yard with wire radials, an SWR meter just barely lifted the needle. I had to use an FDR meter to measure the return loss.
Don't underestimate the importance & suitability of the ground plane if you're trying to skip one of the halves of a dipole. To your radio, you're trying to make the appearance of a center-fed half wave antenna (dipole), except half of the antenna's missing.
Google "Marconi Antenna", that's what you're trying to make. (Wiki)
Have fun, wish I was there.Gloria: "65 percent of the people murdered in the last 10 years were killed by hand guns"
Archie Bunker: "would it make you feel better, little girl, if they was pushed outta windows?"
http://www.moviewavs.com/TV_Shows/Al...he_Family.html
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February 8th, 2012, 06:41 PM #44
Re: CB Radio
Just thought of something.
The antenna has plastic isolation bushings. So the metal of the mount is isolated from the metal of the antenna. If this is correct why ground the mount?
And when you mount the radio itself the case would be grounded to the frame. wouldn't the coax be grounded through that?Last edited by normanvin; February 8th, 2012 at 06:46 PM.
troll Free. It's all in your mind.
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February 8th, 2012, 07:19 PM #45
Re: CB Radio
First, this isn't as simple as basic DC theory. You're trying to encourage the development of an electrical field around your antenna without the second half of the dipole present. So, this is a force-at-a-distance project. The antenna *mast* must be electrically isolated from"ground".
The antenna is fed by the coax, the RF current in the coax is in the center. There isn't supposed to be any current in the outer shell. Grounding the outer shell at the endpoint (IOW, at the antenna bracket) helps keep the RF shield current down.Last edited by PA Rifleman; February 9th, 2012 at 08:25 AM.
Gloria: "65 percent of the people murdered in the last 10 years were killed by hand guns"
Archie Bunker: "would it make you feel better, little girl, if they was pushed outta windows?"
http://www.moviewavs.com/TV_Shows/Al...he_Family.html
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February 8th, 2012, 07:30 PM #46
Re: CB Radio
They make marine antenna's with no ground and that is what I had to use in 85 on a Mack with a nonmetallic composite body.
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February 12th, 2012, 12:29 AM #47
Re: CB Radio
Marine antennas use the water as a counterpoise.
"...a REPUBLIC, if you can keep it."
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March 30th, 2019, 02:13 PM #48
Re: CB Radio
I finally hooked up my CB. I haven't got the antenna tuned perfect but 1 and 40 are under 2.0SWR according to the built in.
The PA works pretty good with the cheapo speaker I got off Amazon. So on a nice day like today I gotta ask is it illegal for me to yell at cyclists on the road through the speaker?
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April 5th, 2019, 12:43 PM #49Super Member
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April 5th, 2019, 01:38 PM #50
Re: CB Radio
I ran a cobra ltd classic stock with a well-adjusted quality antenna. Shakespeare twins. Worked great, took a beating. In the side box, I carried a spare, a tiny little Uniden with 3 knobs, volume, channel and squelch.........worked great too.
Years ago when you could jack up the old 23 channel radios we that and we all ran sideband..........all unnecessary. Even had a Mack Ultraliner in the 80's that had composit doors and cab so I ran a marine antenna.
Galaxy used to make a good radio.
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