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Fixing a whip antenna - GE Superadio III AM/FM

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How do you set the swr on 102' whip antenna


you shouldn't have to but its still good to check.A 102" whip is an antenna thats almost always perfectly matched because it is almost like a 5/8 wave antenna.

Apr 30, 2014 | Radio Communications

1 Answer

How do you adjust antenna


What is the make and model of the antenna? Most have a set screw on the whip above the spring. You loosen that and move the whip up and down

Mar 24, 2013 | Cobra 29 LTD CB Radio

1 Answer

Eton e5 sw shot


The SW FET preamp transistor, Q1, on the underside of the circuit board blows if a static electric discharge hits the whip antenna. In my case, a cat rubbing against me & the radio on a very dry winter day did it in. The back & circuit board has to be removed to get at it. The micro transistor & the solder connection are very tiny, so hard to replace. The antenna jack should still work, because the preamp is only for the whip antenna's SW reception. An easier solution would be to just run a wire from the antenna jack to the whip antenna, but you would no longer have the whip's preamp benefits, or just use a longwire antenna connected to the jack for SW. Also beware plugging into the jack disables the AM ferrite antenna inside, so you might not want anything plugged into it for AM reception because the internal ferrite seems to perform better than any external antenna.

Jan 17, 2013 | Eton E5 Radio

1 Answer

Receives very well- other radios can barely hear me-I have a short mag base antenna


The rule is the taller the antenna the better the reception and power output. Of course it is not always convenient to mount a 102" whip.
  • 4 watts into a 102-inch whip antenna, it is the same output as if you put 11 watts into a 3-foot whip.
  • 4 watts into a 102-inch whip antenna,, it is the same as if you put 14 watts into a 28-inch antenna.
  • 4 watts into a 102-inch whip antenna, it is the same as if you put 54 watts into a 7.5-inch antenna.

You did not mention the signal on their meter and how close they are. This may be a modulation issue. Wattage increases can go unnoticed volume wise but small modulation increase can make dramatic changes in volume to the receiving radio. Check that your dynamike or mike gain control is turned up clockwies increases it. The radio itself may need the modulation increased internally. If you have a powermike with adjustments on back it may be way to low. Hope this was of some help

Sep 01, 2011 | Cobra Radio Communications

1 Answer

I have spotty reception on a handheld CB and was wondering if there is a testing procedure I can use to check the antenna and radio. I have a multimeter. It's a radio shack handheld with weather bands...


The antenna is your problem not much gain. Height is everything tx and rx. Although it would not compare to a conventional cb size negates performance. Seeing is believing in this case hearing get adapter to connect to standard coax of antenna. (PL259) to BNC Coax Adapter Radio Shack sells them. And dont ask or buy any radios there. They are hardly the radioshack of choice anymore.

  • If you put 4 watts into a four-foot antenna, you will get the same power out of that antenna as if you were putting 2 watts into a 102-inch whip.
  • If you put 4 watts into a 3-foot antenna you will get the same power out as if you were putting about 1.5 watts into a 102-inch whip.
  • If you put 4 watts into a 7.5 inch antenna on a hand held CB, it would put out as much power as a third of a watt into a 102-whip.
  • If you put 4 watts into a 102-inch whip antenna, it is the same output as if you put 11 watts into a 3-foot whip.
  • If you put 4 watts into a 102-inch whip antenna,, it is the same as if you put 14 watts into a 28-inch antenna.
  • If you put 4 watts into a 102-inch whip antenna, it is the same as if you put 54 watts into a 7.5 antenna.


May 21, 2011 | Cobra HH 38 WX 40-Channels Handheld CB...

1 Answer

Swr too high new coax cobra 29 radio, truck spec oil filled ant


Make sure the antenna is installed correctly. and away from any metal.. Make sure the insulating washer is on top of the mirror mount.. and that the ground is connected to the ground of the coax.. do not isolate the ground from the mount. Anything near it like a smoke stack,pick-up truck cab, headache racks, vertically near the antenna can change the swr's. Next you would have to adjust the antenna's whip for correct swr's, and depending on location of antenna it would have to be shortened or made longer... ie use a spring or longer whip/shaft to increase the length.. there are many factors on high swr's issues. best way is to see it to fix the problem.

Mar 13, 2011 | Radio Communications

1 Answer

Static increases when i push on the gas


antenna needs a ground or a better ground. 102 whip needs a very good ground.You could try another antenna.

Apr 16, 2010 | Cobra 29 LTD CB Radio

1 Answer

I was wondering what was the range for the radioshack TRC-447 cb radio with a good cb antenna


Antenna :
-should be tuned, have good coax with no pinches, whip is centered over highest flat metal surface, no metal beside adjacent to whip, power is wired to battery direct, not to ignition or cigg lighter. whip is wiped clean of corrosion, whip is up, longer is better.
Praire City car-to-car: 15-20 km's
Praire Rural car-to-car: four-thirds over the horizon. Probably 60 km's.
Alot further over water.
Less within trees and mountains/valleys.
Google "Ham radio" & "ducting" "inversion" "skip" "sun-spots"
these refer to a condition where a radio signal getting stuck between the upper and lower atmospheres and travel intact for 1000's of km's (canada to mexico for example)

Sep 06, 2009 | Radio Shack TRC-447 CB Radio

2 Answers

Antenna


OUCH! Cb antennas are cut to a specific frequency. FM antennas are also cut to a specific frequency. If you ground the antenna to a frame, you short out the antenna. BAD THING. If it is a 102" whip, you would have to cut off about 2/3's of the whip to work. If there is a cylinder at the base of the antenna You would only need about 7' of the whip sticking out for it to work right. Inside the cylinder there is a coil that would make up for the missing length of a 102" whip. I would suggest finding an old CB with FM built in like one of the old SEARS CB/FM receivers.
They had the electronics built in to compensate for the varience in the old sets.

Jul 30, 2008 | Cobra 29 LTD CB Radio

1 Answer

Help with antenna


I think the whip antenna is for mobile,I suggest to get an aerial antenna even an omni type and of course the impedance is 50 ohms and try this antenna a cushcruft the model s ringo ranger 2, it is tunable antenna,I already test it from 2001 up to present,its working fine...

Mar 07, 2008 | Atlantis Crystal Uniden Atlantis 250...

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