Question about Cobra 200 GTL DX 4-Channels Base CB Radio

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First the nightwatch went then the swr metre went the channel change is only going anti clockwise then i cannot transmit at all

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Sounds like you have a voltage regultor problem

Posted on Dec 16, 2009

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Can hear but they can't hear me


It could be a number of problems but most likely your RF power amplifier has blown. Also, try and check your antenna SWR. if it is very high, then your antenna needs retuning. A poorly tuned antenna can cause the RF amplifier to fail.

Mar 03, 2014 | Cobra 29 WX NW ST 40-CHANNEL NIGHTWATCH CB...

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Every time i turn on my cobra 29 wx nw st sound tracker it goes back off


Hi Davis, please post on CB radio forum, this is Radio scanner forum.

Cheers,
Peter

Feb 20, 2013 | Cobra 29 Wx Nw St 40-channel Nightwatch Cb...

1 Answer

The light for high swr keeps coming on. replaced antenna and coaxle. how do i go about lowering the swr. is there a nob or switch for this. thank you


You cannot lower the SWR via the radio. it has to do with the antenna. The length of the antenna is essential to transmitting properly. It must match the transmitting frequency.

To check SWR tune to ch 20. Flip the meter switch to CAL. Key the radio without talking into the radio. Turn the CAL knob up until the meter needle is at the CAL mark. Unkey the mic. Flip the meter switch to SWR. key the radio again, and the meter will show your SWR. We already know it is high because you are getting antenna warning, but we will have a base line now to work on.

What you did was calibrate the meter for that channel. that is necessary to check the SWR. So you must calibrate for each channel you check.

You should at least be under 2 swr. Ideal is 1.5 or under. the lower the better.

If your SWR is high, your antenna is either too long or too short. To find out here is what you do:

Check the SWR on ch 1 and ch 40 calibrating for each channel. Compare the difference of the SWR between 1 and 40. If the SWR is higher on 40 then 1, your antenna is too long. If your SWR is higher on 1 then 40 your antenna is too short. All CB antennas have a way to adjust the length.

If its a mag mount, its usually a set screw you loosen to raise or lower the whip. Fiberglass antenna's usually have something under the cap at the tip to adjust. It will either be like the mag mount, with a set screw and a small rod to raise or lower it, or a screw, that you screw in or out to make it longer or shorter.

make small adjustments. 1/8th or a 1/4 of an inch at a time. Each time you make a change, take an SWR reading on 1 and 40 again and compare the difference. The difference should be getting less. Do this until there is very little or no difference between 1 and 40.

Then you go back to 20, because it is the center channel and check the SWR there. It should now be low. If you did a good job it will be under 1.5 and you are good to go.

Aug 07, 2011 | Galaxy Radios DX-93T Base CB Radio

1 Answer

Can not remember what the proper settings are for all the switches on an Uniden Trucker PTC104


I don't have one on my bench, but I found a picture of one online.

By what I see, here is how you need the switches set:

Mic Gain - turned clockwise, depends on how much modulated power you want to put out.

Squelch - turn all the way counter clockwise to open it up. Then turn it clockwise to set it where you want.

RF Gain - Turn all the way clockwise will open it up, then turn back counter clockwise to where you want it set.

SWR Cal - only used when the SWR/Cal switch is put in the Cal position. After you know the SWR of the antenna, you can use it to set the meter (while keying up) to what was read.


Cal/SWR/(can't read the bottom letters on the picture) - set to Cal to calibrate the meter to the SWR of the antenna, set to SWR so that if something happens to the antenna system, it will go high and you know there is a problem, set to the bottom to see the output power and incoming signal power on the meter.

ANL-NB/NB/OFF - set to the top to turn on the Automatic Noise Limiter and Noise Blanker, set to the middle to just turn on the Noise Blanker, and set to the bottom to turn both off.

PA/CB - turn to PA if you have a pa speaker connected to the radio, this will let you talk through the speaker. Turn to CB to talk on the cb radio channels.

CH9/(can't read but probably says NORM) Set to CH9 to lock the radio on the channel 9 emergency channel. Set to the bottom to use the channel selector to choose the channel to monitor or transmit on.

And lasty, but obviously, set the channel selector to chose the channel to monitor or transmit over.


This should help you out completely. If you have anymore questions at all, don't hesitate to contact me at rollincbmods@yahoo.com. I will answer any and all questions I can.

Dean Pitts
Rollin CBs
Mount Vernon, TX

Apr 07, 2011 | Uniden Radio Communications

1 Answer

I need help setting it up. I just got it but don't knwo how to use it please help ASAP.


hi firstly if your seting it up for mobile use you will need a mobile antenna there are loads out there on the market to choose from I recommend the wilson 5000 or 2000.you will also need a vswr metre can be bought reasonably on ebay at the back of the metre you will see two so239 female inputs one is for antenna the other goes to cb radio you will need a small patch lead for this which has two pl259s at either end ,,,,place the antenna in centre on roof of car ,,,connect antenna to swr metre that says ant,and the other lead to radio ,,now put your radio on channel 19 press the ptt on the mic flick the switch on the swr metre to set or fowrad set needle to end of metre ,then flick switch back to reverse and your needle should be about a 1.5 on the metre if at a 2 or higher you will need to ajust the antenna by sliding the whip up or down hope this helps you out cheers

Feb 13, 2011 | Cobra 19 DX II 40-Channels Base CB Radio

1 Answer

I have the cobra 29 classic k40 antenna. The antenna light comes on when keyed up on 40 but only channel 40. I used an swr meter and that's as good as I can get. Is this ok?


Normally the swr should be set on the centre channel so if you have 40 channels you should set it on channel 20. This is because as you move away from channel 20 the swr rises slightly more for each channel away from the 20. If you set it on channel 40 you'll have twice as much swr on channel 1 more than if you set it on channel 20. If the swr metre shows 1:1 (i.e. doesn't move up at all) on channel 20 the rest should be ok since the antenna was designed for CB. You should however check that the needle showing reflected power doesn't go above 2.5

Jul 29, 2010 | Cobra 29 LTD CB Radio

1 Answer

It transmits off frequency is there a adjustment and also the frequency counter goes crazy at times


To add 10Khz to your transmit frequency:

FIXED/OFF/+10KHz SWITCH:
The left position puts the radio on
one of the three fixed channels that is selected by the channel switch
(6,19, or 21). This over-rides the channel selected by the 40 channel
knob. The right position adds 10KHz to whatever frequency you are ON.
In the middle, both features are OFF.

Otherwise, a radio tech would be able to retune the frequency inside the radio.

After adding 10KHz to your frequency, use the SWR control to check the SWR of your antenna.
Here's how:
SWR CAL CONTROL: Normally this switch is set to “PO”. Then,
during transmission, the meter indicates output power. To read SWR,
rotate this knob during transmission until the needle moves to the “SET”
point on the SWR scale. Then, while still transmitting, set the R.B./SWR
switch to SWR.

Ideal SWR is 1 but you'll want to be as near one as possible. An SWR of 1.6 or greater will make ineffective use of your antenna.
If in doubt, a radio tech has the required meters and tools to adjust the SWR/Tuning of your antenna.

May 10, 2009 | Galaxy Radios DX-73V 40-Channels Base CB...

1 Answer

Matching c b antenna with c b radio


here is some information that will help you test SWR with an inline watt meter. To get proper results you need to use an inline watt meter. Here is a really good site you can go to for help www.cbradiotalk.com

Equipment needed: SWR meter, short jumper coax 3 foot.
midland.jpgProcedure: The SWR meter needs to be placed in line between the antenna and the CB. Connect the antenna (normally connected to the back of the CB ) to the connector marked "Antenna" or "Ant" on your SWR Meter. Connect one end of the short jumper coax to the "transmit" or "Xmit" on the SWR meter. Connect the other end of your jumper coax to the CB.
Assuming you have a standard SWR meter the switches should read as follows: REF or SWR, FWD, and there should be a slide switch marked "set" or "Adjust". If different consult your meter's owners manual.
With the radio on the lowest channel (1 on CB) and the SWR meters switch in the Forward (FWD) position, depress the transmit switch (key up) located on the microphone. While holding the unit in this transmit mode, adjust the meter needle to the set position using the Set or Adjust knob on the meter. As soon as the needle is in alignment with the corresponding mark on the meter face, flip the switch to the Reference (REF) position. The meter is now showing your SWR on channel one. Note the value and quickly release the microphone switch. Record this reading.
Repeat the previous step on channels 19 and 40.
How to read your results: If SWR on channels 1, 19 & 40 is below 2.0, your radio can be operated safely.
If SWR on all channels is above 2.0 but not in the "red zone" (normally over 3.0), you may be experiencing coaxial cable reaction (bad quality, wrong length, etc.), insufficient ground plane, or have an ungrounded antenna mount.
If SWR is in the "red zone" on all channels, you probably have an electrical short in your coax connectors, or your mounting stud was installed incorrectly and is shorted. Do not operate your radio until the problem is found, serious damage can occur to your radio.
If SWR on the lowest channel is higher than it is on the highest channel, your antenna system appears to be electrically short. Your antenna length may need to be increased.
If the SWR on channel 40 is greater than that on channel 1, your antenna is considered to be "LONG" and reduction of physical height and/or conductor length will correct this situation.


Aug 01, 2008 | Cobra 29 WX NW ST 40-Channels Base CB...

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