Question about Motorola Talkabout T5700 AA (22 Channels) 2-Way Radio

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Cant pick up on cb radio

Are theyon the cb wave

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No, T5700 radios operate on UHF FM frequencies in the 450-470 MHz range. CBs will not communicate with them.

Posted on Jan 31, 2009

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Can regent home theater system modle ht-2004 pick up radio signals or cb radio waves.


Most audio equipment will pick up radio waves of various kinds. The question is do you want it to?
If as I suspect you don't then you have a problem. You can get special filters that connect between the aerial plugs and the receiver. These are set up to remove CB radio signals. Your local electrical parts shop or aerial installers will stock them. Also fit cable connections that are good quality, designed with high quality screening built in.

Apr 14, 2015 | home Audio Players & Recorders

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I have a uniden bearcat 880 cb. I works great sitting still but moving down the road it picks up nothing. Can somebody help me out I can't figure it out


what antenna type are you using. What is the standing wave ratio of the antenna.
http://www.ebay.com.au/gds/A-GUIDE-TO-INSTALL-CB-RADIO-ANTENNAS-WHAT-IS-SWR-/10000000000925345/g.html

Jan 04, 2015 | Radio Communications

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I just mounted a dual antenna set to the bed of my pick up.. i took a grinder to the underside of my bed to get a good ground to the metal...my cb turns on and i calibrated it just like i always do... i...


You need somebody with a swr meter to calibrate the installion, if your antenna light is coming on the swr readings are to high and you risk blowing the rf transistor in the radio.

May 08, 2012 | Cobra 29 LTD CB Radio

1 Answer

Won't send out. I have replaced mike already.


if the Mic gain is up. and an antenna is connected. its possible that the transmit circuit is blown out. this is definitely the case if you have been operating the radio and the red ant lift has been lighting when you key up. that means your antenna was not tuned to the radio and your swr was too highroad. swr is standing wave ratio. basically if the antenna is not exactly the right length thenyou create a standing wave that does not leave the antenna and bounces back down the coax into the radio which destroys the transmit circuit. if when you key and there is no signal output then it is shot.

but make sure the cb pa switch is on cb.

Jun 15, 2011 | Cobra 29 LTD CB Radio

1 Answer

Why dont these reach very far??? i got an Pyramid 20cb antenna Any good??


CB radios are limited to 4 watts input to the 'final'. CB is suppose to be 'line of sight' or about 20 miles. Variables include where you are using the radio ... in the city or in the country ... signal is blocked by buildings and other environmental conditions. A full wave is 36 feet ... is your antenna some number that will multiply to 36 feet? 1/2 wave antenna = 18 feet ... max allowed in the US ... max hight is 20 feet above the mount. If you have an 'old' CB, they were limited to 5 watts to the final. On a good night, one might talk 100 miles away ... but is of course not legal.

Sep 21, 2010 | Uniden PRO510XL 40-Channels Base CB Radio

2 Answers

Radio reception


Cb radio is line of sight. If there is a hill in the way, or some other kind of structure it will block the radio waves.

But also, radio waves, will bounce of the ionosphere and come back down.

So whats probably happening is...

You hear people close because they are near. You can't hear some one some what far away because of hills or something, but you talk to people far away because the are within range of the radio waves bouncing back down to them

Jul 10, 2010 | Cobra 25 WX-NW-ST 40-Channels Base CB...

1 Answer

I Cant Pick Up Any Signals On my Cobra 25 LTD 40-Channels Base CB Radio all i hear is nothing. no truckers saying stuff. i just get white noise i do have an antenna. it is a tv antenna w/ bunny ears :) i...


Your problem is probably the rabbit ears. They are for tv in the 54+
Mhz and CB is 27 Mhz. For simplicity, go to Radio Shack and get a back of the radio indoor antenna. They run under $20. If you want to get more; try a roof antenna or a 1/2 wave cb marine antenna outside.
Hope it helps.3
Tom

Jul 19, 2009 | Cobra 25 LTD 40-Channels Base CB Radio

1 Answer

Cant pick up anyone on my new pro530xl cb and my marine mc 2800 cb,got a new airial still nothing...help please!!!


check yr antenna if is well grounded and install a swr meter between radio-antenna and check again,
rgds Stefano

Nov 27, 2008 | Cobra 25 LTD 40-Channels Base CB Radio

2 Answers

School project


When you talk into the microphone your voice which is sound pressure is converted to electrical voltages then it is increased in power to about half of the power of what the CB will sen out to the antenna. To make the CB radio transmit, there is a circuit that creates the proper frequency or channel. It is then increased to about twice the power of the voice circuit. They are combined together just before it goes into the antenna.It leaves the radio and goes into the antenna where it leaves the antenna as an electromagnetic wave. Electricity in the air with a certain value of frequency and strength. When the CB receives, The antenna picks up a signal, an electromagnetic wave, as it passes by. The electromagnetic wave, which is a small voltage, with a certain frequency and strength, enters the radio where it is processed . It is then increased in power . It is now connected to a speaker. The speaker is also a converter. It converts electrical voltage back to sound pressure so we can hear it. As the electrical voltages make the cone of the speaker move in and out. There is a lot more detail than this but this should help. Many things happen inside the radio that cant be explained in a few paragraphs.

May 14, 2008 | Cobra 29 LTD CB Radio

1 Answer

I can't pick up anything...


Hello even though everything is connected properly, have you checked for standing waves on the antenna to radio connection? Also you may have to perform a sensitivity test on the unit. The problem is you need a RF generator for that. Set you RF generator to the frequency that is equal to the CBs middle frequency and modulate the CW with 1KHz at 50% modulation, tune to the middle of the CB band on the radio and set the output of the RF generator to .1uv and loosely couple the signal to the CB antenna with a loop of wire. Your CB should be picking up a 1KHz tone gradually turn the power level down and when the tone cuts off that level is cutoff level, then increase the level until you can hear the tone again when the tone cuts on that value is the sensitivity of the unit. Compare the measured value to the value in the owners documentation. if the sensitivity is low this could denot a problem in the RF/IF section of the CB.

Oct 04, 2007 | Uniden Bearcat Pro PC68LTW 40-Channels...

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