When keying up in either Hi power or Lo power, when I key the microphone, the radio flickers on and off, and I can hear the regulator(?) clicking. This is all in AM mode, I havent tried USB or LSB. I have had the channel mod done, and it was peaked and tuned. I am using it as a base, and using a Tripplite PS 12 (12 AMP) power supply. I was wondering if its pulling more AMPS (more than 12) because of the peaking and tuning. Any help would be appreciated.
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Re: Radio clicks on and off during transmit.
There might be a few things going on here. You say you hear clicking, regulator woudnt be doing that as they are solid state. It could be a relay, some radios have relays instead of electronic switching when you key up.If the voltage is too low that can cause the relays to "chatter", I would look into that first. Can you take the radio to your vehicle and hook it up there ? ( If you are set up for that) just to see if your battery will drive it better. Are you running a Kicker or modulator? Lets get this sorted out and see what happens,there are other things but lets try one at a time.
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Does the radio actually Transmit? If the radio says it is transmitting but no power is coming out then you may have damaged final output transistors. Please give us more information about the type of radio you are using and the antenna / coaxial cable attached to the radio.
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
In order to get the most out of your new radio, read this reference guide completely before attempting to operate the radio.
Turning the Radio On and Adjusting the Volume
1) Press and hold the key to turn the radio ON.
2) To change the volume level press the volume/monitor up or down key to increase or decrease the volume level.
3) Press and hold the key to turn the radio OFF.
Adjusting the Sound (Key Beeps)
Your radio emits a beep each time one of the keys (except for the PTT button and call key) is pressed. The sound of the Key Beep will increase or decrease depending on the volume level setting.
To turn OFF this beep:
Press and hold the call key while turning ON the radio.
To turn ON this beep:
Turn the radio OFF and ON again.
Choosing a Channel
Your GMR325-2 radio has 22 channels you can use to talk to others. In order to speak to someone, each of you must be set to the same channel.
To choose a channel:
Press the channel/scan up or down key to increase or decrease the channel number displayed.
Channel Scan Feature
Your GMR325-2 radio has a channel Scan feature that allows you to easily Scan all 22 channels. When an active channel is detected, the unit will pause on that channel until the channel is clear. Then after a 2 second delay, the unit will continue scanning.
Pressing PTT button while the Scan is paused on a channel will allow you to transmit on that channel.
To turn ON channel scanning:
Press and hold either the channel/scan up or down key. The channel number on the display will rapidly cycle through the channels.
To turn OFF channel scanning:
Press either the channel/scan up or down key.
Talking on Your Radio
To talk to others using the radio: 1) Press and hold the PTT button and speak in a clear, normal voice about 2-3 inches away from the microphone.
While you are transmitting the tx icon is displayed. To avoid cutting off the first part of your transmission, pause slightly after pressing the PTT button before you start talking.
2) When you are finished speaking, release the PTT button.You can now receive incoming calls. While receiving, the rx icon is displayed.
Transmitting a Call Alert Tone
Your GMR325-2 radio is equipped with a call tone that will be transmitted when the call key is pressed.
To transmit the call alert tone, press the call key.
The tone will automatically be transmitted for a fixed length of time.
Auto Squelch Feature
The GMR325-2 is equipped with an automatic squelch system which shuts off weak transmissions and unwanted noise due to terrain conditions or if you have reached your range limit.
Monitor Mode Feature
Your GMR325-2 radio allows you to listen for weak signals on the current channel at the press of a key.
To turn ON monitor mode:
Press and hold the volume/monitor up or down key. The rx icon will blink.
To turn OFF monitor mode:
Press the volume/monitor up or down key. The rx icon will stop blinking.
Automatic Power Save Feature
Your GMR325-2 has a unique circuit designed to dramatically extend the life of the batteries. If there is neither transmission nor an incoming call within 2 seconds, your radio switches to the Power Save mode. The radio is still able to receive transmissions in this mode.
Press and hold the call key until the "L" appears. After 1 second, the LCD will return to the channel display. To exit Keylock on mode, press and hold call again.
Note: While in keylock on mode, it will still receive transmissions.
Roger Beep is a BEEP that is sent to notify the end of transmission. Roger Beep can be heard through the speaker when Key Beep is on. Roger Beep is transmitted even if key beep is turned off. However Roger Beep will not be heard from the speaker.
To turn OFF Roger Beep: Press and hold the channel/scan up Key while turning on the radio.
There are a few different things that can cause this problem.
1: If it is a power microphone (a microphone that requires a battery).
Try replacing the battery.
2: Broken wires that go from the microphone to the plug that plugs into the radio.You can try gently taking the plug apart and inspecting the wires.
If only one has come loose, you can re solder it to the pin it came from. If more than one has come loose, find a wiring schematic for the radio that tells which wire goes to which pin and re solder appropriately.
3:Have the SWR's checked on the antenna. If the SWR's are to high and the radio has been being used in this fashion, it could have burned up the transmit finals in the radio. If this is the case, you will need to take it to a reputable radio repair facility to have fixed.
It sounds like a microphone problem! I am a C.B. & Ham radio Tech. Try changing the microphone to another one and make sure the Microphone is the right one for the radio. If the microphone is not the right one for the radio it will not work right or when you plug it in it will automatically key up and transmit and the red TX light will come on and it will try to transmit somthing and that would be the thumping everyone hears!! Try that first and let me know if you have any other questions then you can E-mail me at email@example.com
The symptom sounds like a bad Microphone connection or a bad microphone!! The Cobra has a built in circuit that wont allow you to hear anyone until the microphone is plugged in and the no transmit part will also do the same. Try another microphone that is wired right for that radio before you do anything else!! let me know!!
What happens if you "key up" and "let off" and the transmitter "hangs", you remove the microphone plug from the Cobra ? Will it still be transmitting or will it stop ? If it stops, the problem is in the microphone with a "hanging" switch which you can easily clean or replace. Iif it keeps transmitting while the mike is disconnected, there is a problem with the Rx/Tx switching circuit. This needs further investigation by use of a circuit diagram.