Question about Cobra 148 GTL 120-Channels Base CB Radio

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When i key the radio it stays on rx does not tx

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Sounds like you have a broken microphone wire or a bad mic switch.

Posted on Sep 13, 2010

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1 Answer

I need wire colors for CB microphone its a TRC


ALTAI PWR MIC - black/braid= earth, red=RX, white=TX, Yellow=MODASTATIC - blue/braid=earth, black=RX, red=TX, white=MOD, Yellow=Spare
SIRTEL ECHO MIC CBE 2002 - black/braid=earth, blue=TX, white=RX, red=MOD007 POWER MIC - brown/braid=earth, green=RX, white=TX, blue=MODSADELTA EC 980 - braid=earth, green=RX, brn=TX, white=MOD
or braid=earth, black=RX, blue=TX, white=MOD

Oct 30, 2016 | Radio Communications

1 Answer

Stuck on rx mode


Rx is an abbreviation for receive. (Tx is transmit) There are a variety of reasons a radio will be "stuck" in Rx:
1) Another radio in the group is stuck in transmit and you cannot reply if your radio is receiving the other radios transmission.
2) Your radio is programmed for Rx only.
3) Your radio has a Tx problem such as a bad mic, or something covering the mic opening.
4) Your battery is low or bad. It takes more energy to Tx than to Rx.

Best regards.

Feb 07, 2014 | Cobra LI3900-2DXVP (14 Channels) 2-Way...

1 Answer

148 gtl cobra cb radio and the rx/tx light stay on


This sounds like a problem with the MB3756 Regulator IC. It controls voltage regulation and TX/RX Switching. It is a common failure in these radios. Check voltages with schematic that can be found at
CB Tricks Home Page

Sep 02, 2013 | Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

Superstar 3900 el led rx/tx cambia a naranja en ves de rojo


There can be several things for that. 1 a bad microphone.2. bad switching diode. or 3 bad rx/tx transistor.. if its staying orange. the #2 is probably the issues.
can you provide more detail, as will it RX.. at all.? will it work in PA mode if theres one? etc

Apr 21, 2013 | Superstar 3900

1 Answer

Tk3312 will not recieve repeater but audio is fine and channels with out pl are fine


1- Did you choose the right Tone for both RX & TX?

If you have RF present but not the right tone, the green led should turn on.
One of the side key should be a Momentary "Squelch Off" (By default, it programs like that). Use it when you you see the green led turn on.

If you have the wrong Tone Squelch programmed, the side key will let you hear the repeater to confirm the problem.

2- If it didnt do the trick, Look for a RX/TX frequency mismatch. maybe your RX/TX frequencies are wrong for this channel?

3- If you have checked all the above, maybe your radio have a bad ceramic filter and your unit has lost it's sensibility. (Youll hear only people near to you.)
If it's the case, usualy only one half of the filter goes bad. Try swapping the Bandwith type in programmation. If WIDE, try NARROW or the opposite. If you receive in narrow but not in wide, the filter is bad. In more than 50 radios with Sensitivity problem, I only got one with both Wide/Narrow sides of filter bad.
If you have access to a spectrum analyser, on a "RX Test" you should see ~0.2uV. Anything higher than 0.3uV mean you have a serious RX problem.

Sep 06, 2012 | Kenwood Tk-3312 Uhf Handheld Radio

2 Answers

Does the rx/tx green light stay on all the time? Cobra 29LTD


Yes the light will stay on and change when you key the mic

May 07, 2010 | Cobra 29 LTD CB Radio

1 Answer

Connex 4600 turbo radio stays keyed up even with mic disconected


Bad RX/TX Transistor? I don't have a diagram for the 4600. Sorry!

Mar 28, 2010 | Connex 4600 Base CB Radio

1 Answer

Cx80 stuck in rx mode , power cycled, swapped batteries, changed channels, will only swtich to tx when ptt button pressed, otherwise always in rx mode, other radio from package works fine


But thats how a walkie talkie works, it stays in Receive Rx mode UNTIL you press the PTT button,, then it Transmits Tx, and when released it goes back to Rx, receive?

Feb 18, 2010 | Radio Communications

1 Answer

Radio lights up, but no TX/RX.


Hi and welcome to FixYa,

Based on your description, a possible drift in the local oscillator.  Check the 10.24Mhz crystal filter and its local oscillator for output and consistency.

Good luck and thank you for asking FixYa.

Aug 24, 2009 | Cobra Radio Communications

1 Answer

Audio settings


default values of the secret E370 audio menu by inputing *#8999*8378*

 

Normal
MIC gain - 0
Tx PGA - 70
Side PGA - 0
Ear gain - 3
HFR gain - 9
Rx PGA - 128
Rx vol - Lv 1 - 10
Rx vol - Lv 2 - 28
Rx vol - Lv 3 - 40
Rx vol - Lv 4 - 50
Rx vol - Lv 5 - 96
Rx comp - Lv 1 - 11
Rx comp - Lv 2 - 11
Rx comp - Lv3 - 11
Rx comp - Lv 4 - 29
Rx comp - Lv 5 - 30
Key vol - Lv1 - 64
Key vol - Lv2 - 64
Key vol - Lv3 - 64
Key vol - Lv4 - 64
Key vol - Lv5 - 64

Headset
MIC gain - 0
Tx PGA - 64
Side PGA - 0
Ear gain - 13
HFR gain - 3
Rx PGA - 128
Rx vol - Lv 1 - 10
Rx vol - Lv 2 - 20
Rx vol - Lv 3 - 42
Rx vol - Lv 4 - 76
Rx vol - Lv 5 - 146
Rx comp - Lv 1 - 11
Rx comp - Lv 2 - 11
Rx comp - Lv 3 - 11
Rx comp - Lv 4 - 30
Rx comp - Lv 5 - 28
Key vol - Lv1 - 10
Key vol - Lv2 - 20
Key vol - Lv3 - 42
Key vol - Lv4 - 76
Key vol - Lv5 146

Loud SPK SUP
MIC gain - 0
Tx PGA - 160
Side PGA - 0
Ear gain - 12
HFR gain - 5
Rx PGA - 120
Rx vol - Lv 1 - 16
Rx vol - Lv 2 - 27
Rx vol - Lv 3 - 45
Rx vol - Lv 4 - 76
Rx vol - Lv 5 - 128
Key vol - Lv1 - 1
Key vol - Lv2 - 2
Key vol - Lv3 - 3
Key vol - Lv4 - 4
Key vol - Lv5 - 4

Loud SPK SDN
MIC gain - 0
Tx PGA - 160
Side PGA - 0
Ear gain - 12
HFR gain - 5
Rx PGA - 120
Rx vol - Lv 1 - 16
Rx vol - Lv 2 - 27
Rx vol - Lv 3 - 45
Rx vol - Lv 4 - 76
Rx vol - Lv 5 - 128
Key vol - Lv1 - 1
Key vol - Lv2 - 2
Key vol - Lv3 - 3
Key vol - Lv4 - 4
Key vol - Lv5 - 4

Loud SPK EXT
MIC gain - 1
Tx PGA - 226
Side PGA - 0
Ear gain - 12
HFR gain - 5
Rx PGA - 92
Rx vol - Lv 1 - 16
Rx vol - Lv 2 - 27
Rx vol - Lv 3 - 45
Rx vol - Lv 4 - 76
Rx vol - Lv 5 - 128
Key vol - Lv1 - 5
Key vol - Lv2 - 2
Key vol - Lv3 - 3
Key vol - Lv4 - 4
Key vol - Lv5 - 4

Loud SPK Out Only
Tx PGA - 160
Side PGA - 0
Ear gain - 12
HFR gain - 5
Rx PGA - 120
Rx vol - Lv 1 - 10
Rx vol - Lv 2 - 28
Rx vol - Lv 3 - 40
Rx vol - Lv 4 - 50
Rx vol - Lv 5 - 96
Key vol - Lv1 - 1
Key vol - Lv2 - 2
Key vol - Lv3 - 3
Key vol - Lv4 - 4
Key vol - Lv5 - 4

Yamaha AMP vol.
31

Yamaha MEL vol.
Normal
Lv 1 - 6
Lv 2 - 12
Lv 3 - 18
Lv 4 - 24
Lv 5 - 31
Melody key
Lv 1 - 2
Lv 2 - 4
Lv 3 - 11
Lv 4 - 18
Lv 5 - 25
Power on/off
Lv 1 - 1
Lv 2 - 10
Lv 3 - 14
Lv 4 - 18
Lv 5 - 22

ISS Normal
Ear gain - 12
HFR gain - 3
Rx vol - Lv 1 - 121
Rx vol - Lv 2 - 186
Rx vol - Lv 3 - 268
Rx vol - Lv 4 - 376
Rx vol - Lv 5 - 564
Rx vol - Lv 6 - 802
Rx vol - Lv 7 - 980
Rx vol - Lv 8 - 1560
Rx vol - Lv 9 - 2167
Rx vol - Lv 10 - 2863

ISS Headset
Ear gain - 10
HFR gain - 3
Rx vol - Lv 1 - 164
Rx vol - Lv 2 - 328
Rx vol - Lv 3 - 492
Rx vol - Lv 4 - 656
Rx vol - Lv 5 - 820
Rx vol - Lv 6 - 984
Rx vol - Lv 7 - 1148
Rx vol - Lv 8 - 1312
Rx vol - Lv 9 - 1476
Rx vol - Lv 10 - 1640

Bluetooth
Tx PGA - 255
Rx PGA - 12
Side PGA - 0

Oct 04, 2007 | Samsung SGH-E370 Cellular Phone

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