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The receiver is fine but it does not transmit. There is a U at the lower right corner of the display. Is it pll unlocked?

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Why does my mr hh300 display UL on the screen. It won't do anything but display UL. The batteries show fully charged. I worked a couple of months ago. Unplugged due to getting new flooring and


UL means "Out of Lock". The synthesizer is having a problem. This can have many causes. Did someone try to modify it for expanded channels, that is mostly what causes this. If the radio is factory original it could be the VCO, the PLL chip or the reference oscillator that is causing the problem. The reference oscillator is the easiest to check; listen on a shortwave receiver if you can hear a carrier coming from the CB at 10.240 MHz (hold the receiver antenna real close to the CB)

Sep 16, 2014 | Radio Communications

1 Answer

My JHP 500 Tranceiver will receive but not transmit, any Idea's


It may have been PLL instead of PPL. If so, that stands for Phase-Locked Loop, and is the circuit that the transmitter needs to generate the desired frequency to transmit on. That being the case, there's no user remedy and the unit must be serviced by a qualified radio shop.

Mar 30, 2014 | ICOM Informatique IC-A23 VHF NAV/COM Air...

2 Answers

Cb radio channel display doesn't work no transmit no receive but still powers up.


First lets see why the channel display is not lighting up. This indicates a problem internally with the radio. Is the CB/PA switch in the CB position? If the CB/PA switch is in the CB position and the display is still not lighting up then you more than likely have a problem with a voltage regulator. If the regulator shorts or opens then the meter lights will come on but the VCO / PLL circuit will be dead thus No receive or transmit.

Mar 05, 2014 | Cobra 29 LTD CB Radio

1 Answer

My hr2600 shows error 3 when it is keyed up and does not transmit


0 = Transmitter Timeout timer has timed-out
1 = Transmit Frequency is lower than TX Lockout Lower Limit
2 = Transmit Frequency is greater than TX Lockout Higher Limit
3 = Phase-locked-loop (PLL) won't lock at this transmit frequency
4 = PLL is intermittently coming out of lock during transmit
*If your radio displays error 3 or 4, don't keep trying to transmit on this frequency. The cause of the problem could be low power supply voltage to the radio or the radio's VCO loop needs adjustment. Refer to a qualified technician for service. Contact the installer of the chip first. If, however, you installed the chip yourself, contact a qualified technician for service.

Sep 24, 2013 | Magnum DeltaForce CB Radio

1 Answer

Cobra 1000 will not receive or transmit.


Sounds like a problem with the VCO / PLL Circuit since nothing happens in RX or TX. Check to make sure you have the correct supply voltages to start with and also check to see if you have 10.240Mhz. Use the service manual and go through the PLL/VCO alignment section. If anything is missing then you at least know where to look.

Apr 30, 2013 | Cobra 148 GTL 120-Channels Base CB Radio

2 Answers

148 gtl receive works fine transmit has no power


Have you checked the 2sc2166 or the 2sc1969? Those are the RF Driver and the RF Final output transistors.

Jan 07, 2013 | Cobra 148 GTL 120-Channels Base CB Radio

3 Answers

How do i unlock my sat nav, when i dont know the pin code, which my child has put on it


1.- Power off the GPS
2.- Press and hold the reset button
3.- connect the N?vi to an EXTERNAL power source
From the user manual
For the soft reset holf the lower - right corner while power on, wait still pressing the lower - right corner till the message appears.

Oct 17, 2010 | Garmin nuvi 200W GPS Receiver

2 Answers

Cybernet CB Radio does not receive or transmit. Switches on OK and lights up. ?? Can anyone advise how I can fix this ? (UK)


Several areas to check, Squelch should be all the way rotated to the left, Microphone may have a bad wire, bad audio amp.... Deeper problem could be a bad switching diode or bad relay if it is an older rig. Since the mic is the first thing to go bad, that is where you should focus...

Mar 20, 2010 | Radio Communications

1 Answer

Have Cobra 29 LTD CB Radio w/ bluetooth. Power comes on. Does not receive or transmit. What's wrong?


Sounds like the PLL circuit....... no channel synthesizer will kill the transmit and receive...... bad crystal or IC could be at fault or if someone has attempted to add more channels could also be cause.

Dec 20, 2008 | Cobra 29 LTD CB Radio

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