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Rx tx light turns red on my connex 4300 hp when i key up mic ,,,why

How do I set up my swr

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Posted on Jan 02, 2017

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Laron71
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SOURCE: Cobra 29 ltd Classic no

Check speaker and plug external one in if you have it.

swap mic could be a broke wire or bad switch in handset.

check antenna and coax connections.

i know checks sound basic but they could save you a lot of headaches later

Posted on Jul 02, 2011

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SOURCE: connex 3300hp not receiving at all rx tx light on front not on, key mic turns red

MAKE SURE ALL THE CONTROLES ARE SET CORRECTLY R-R GAIN CLOCKWISE FULLY, SQUALCE COUNTER CLOCKWISE FULLY AND HAS THE RADIO BEEN MODIFIED FOR THE 11 METER BAND BY SOMEONE

Posted on Feb 27, 2013

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1 Answer

I have a connex cx-4300 hp cb it will receive but won't send how do I fix this problem


Is there any RF being transmitted, to a nearby radio. also does the TX/RX led change.

There are many scenarios on this..

Loose/cold solder joints on the board.
loose diode on solder side of the IF area..
Bad RF transistors from High SWR..

if you can provide more info.

Jan 31, 2016 | Connex Radio Communications

1 Answer

My tx rx light comes on when i key mic on my connex 4300hp ,,why


Check the mic wires inside the connecter, there might be a loose or broken wire that is making an intermittent connection.

Dec 28, 2013 | Cobra 29 LTD CB Radio

1 Answer

Connex 3300hp not receiving at all rx tx light on front not on, key mic turns red


MAKE SURE ALL THE CONTROLES ARE SET CORRECTLY R-R GAIN CLOCKWISE FULLY, SQUALCE COUNTER CLOCKWISE FULLY AND HAS THE RADIO BEEN MODIFIED FOR THE 11 METER BAND BY SOMEONE

Feb 25, 2013 | Connex 3300 240-Channels Base CB Radio

1 Answer

Wire 4 pin turner plus three mic up


pin 1 gnd
pin 2 audio
pin 3 tx
pin 4 rx

Dec 24, 2012 | Connex CX-4300HP CB Radio

1 Answer

What do you think is wrong with my connex 4300 HP, I turn it on it powers up,but no adio it has static. It seems to have a dead key and swing. Any ideas? Thanks Jim


You will need an SWR meter to check your antenna. FIRST.
I would find help at a local cb shop.. They SHOULDN"T CHARGE to help you SET the swr. only if you need a part or something ..
I don't charge to SET SWR"s .. only if the cust needs a insulating washer or another antenna, or new coax, so-239 etc... I would be glad to help you.. let me know if we can CB Shop Temple, TX
Any shop shouldnt charge you just to see if it works!!

Nov 25, 2011 | Connex CX-4300HP CB Radio

1 Answer

When i key in both green lights turn red. is this normal ?


One of the lights is marked RX/TX. This light normally turns red when you press the mike key. The other light indicates a bad SWR if internal circuits are properly aligned. If someone has turned the pot which sets the level at which the light comes on, it may come on when you press the mike key. Check your SWR with an external meter to see if you have problems in the antenna system. The way I set this light in my shop is to put a 150 ohm resistor on the antenna connector and set the control so that the ANT light just comes on.

Jun 15, 2011 | Cobra 29 LTD CB Radio

1 Answer

Put another **** on 29 ltd and lost key up and receive but it still lights up. What you thank is wrong. 5 different mics, all work in my other radios. I heard something chatter and it would not tx or rx...


Check to make sure that there is noting shorting out inside of the radio. some mic plugs can turn from overtighting the mic connector.. also check the pins they may be broke or compressed too much and won't make connection to any mic.. Pin 1 is ground and pin 4 is rx.. take a jumper wire across those and see if you get rx back. same for tx pin 3.. jumper pin 1 and 3 should have a key up. pin 2 is your of course audio. these should be first things to check. cobras unidens and galaxys, connex, genlee etc. are wired the same. midlands and radioshacks ge are different. so make sure your mic is wired for a cobra or galaxy also.. any mic will work on any radio. as long as is it wired to it correctly....

Dec 15, 2010 | Radio Communications

1 Answer

I have a cobra 25 ltd and when i key the mic the gauge of the db barley goes up. is something wrong ? also the gauge says its measuring tx power what does that actually mean/ do


TX means transmit. There are 3 settings for the meter. The top one is to measure your TX/RX that's transmit and receive. CAL is to calibrate the meter to check your SWR.

Reasons your needle may not be moving much when you key while on TX/RX. The dynamic is probably all the way down. That is your mic gain. If you turn that up when you talk the needle will swing more. If the radio is stock and not modded, you can turn this all the way up and leave it.

Also there could be something wrong with the mic. If people can hear you then its not the mic.

If people can hear you fine when you transmit, it may just be a bad meter. Not a big problem, you will just need an external meter to make sure you swr is not high.this is important because if it is over 1.5 you run the risk of blowing the final transistor.

Oct 11, 2009 | Cobra 29 LTD CB Radio

2 Answers

When i key up the mike the tx/rx light and the ant


your swr setting are off wack fix your swr

Oct 02, 2009 | Cobra 29 LTD CB Radio

1 Answer

The ant light and the other light light up red when i key the kic


the tx/rx liight is green when your radio is recieving signals and turns red when you are sending signals. the ANT light is red when your SWR is too high (over 3)

1. turn the knob labeled swr cal all the way counter clockwise
2. set the rf swr cal switch to the CAL position
3 key up the mic and hold it while you rotate the swr cal knob until the needle reaches the swr cal postition
4. set the swr cal rf switch to the swr position
5. key up the mic while on chanel one (record the the number)
6. switch to chanel 40 key up the mic (record the number)
if the number on chanel one is lower than the number on chanel 40 then your antenna is too long.

Sep 14, 2009 | Cobra 29 LTD CB Radio

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