Will not transmit or receive - Motorola Mag One BPR40 Two Way Radio

What is the swr? This can impact the receiver. However, the tuning coils for receive and transmit are close to each other and someone most likely turned the receive coil instead of the transmit coil. The coils that are adjustable that affect receive are 13, 15 and 3. 3 is the coil that is close to the transmit section. You may want to have it realigned.

Assuming it is programmed correctly, it is a weak, undercharged or bad battery. Transmit takes a lot more power than receive. A beep or no transmit, even if the Transmit light comes on can still mean the battery condition described.

if you have a receive tone squelch or digital receive set you wont hear anything unless the transmitting radio is set to transmit that

It is possible your Code for transmit is different than your Code for receive. Cobra makes so many models, you are not giving enough information. Also, Transmit takes a LOT of power, so even if everything is setup, if your batts are weak or old, the radio will receive, but not transmit. Also check your antenna, make sure it is tight and NEVER transmit without an antenna. Yes, all lights will work even with old batteries.

get another that only receives and no transmit.hook them up together .one on top of the other .I have a friend that did this and it actually worked

defect ptt buttom

Transmitted Error Count 4734440

Ack Rcv failure Count 15269951

• As per the above there are error on Transmitting the packet and also for receiving the acknowledge packet.
• Please check whether any disturbance in the link
• Each PPP packet has a checksum attached to ensure that the data being received is the data being sent. If the FCS of an incoming packet is incorrect, the packet is dropped and the HDLC FCS count is increased.
• Another reason for seeing too many FCS errors may be that the remote end has stopped talking PPP.

Check the input voltage into the radio while in transmit. The voltage maybe dropping as you go into transmit which causes it to drop into receive. That in turn allows the voltage to come back up. With your finger still on the PTT it tries to transmit again, etc. This could cause a feedback squeal and other symptoms.

here is the info you asked for the following is the correct wiring.


Mic Wiring Info
Stock Mic Wiring
1. Ground Shield
2. Audio Yellow
3. Transmit Red
4. Receive Black
5. CH. Up White
6. CH. Down Blue
Turner 4-Wire MIC. Wiring
1. Ground Shield
2. Audio White
3. Transmit Black
4. Receive N/C
5. CH. UP N/C
6. CH. Down N/C

Turner 6-Wire MIC. Wiring
1. Ground Shield & Red
2. Audio White
3. Transmit Blue
4. Receive N/C
5. CH. UP N/C
6. CH. Down N/C

Astatic 4-Wire MIC. Wiring
1. Ground Shield
2. Audio White
3. Transmit Red
4. Receive N/C
5. CH. UP N/C
6. CH. Down N/C

Astatic 6-Wire MIC. Wiring
1. Ground Shield & Blue
2. Audio White
3. Transmit Red
4. Receive N/C
5. CH. UP N/C
6. CH. Down N/C

While there might be a multitude of answers to this question. The first would be the radio is in need of repair, or not programmed correctly.