As confirmation this a mobile hand held transmit/receiver radio with a 3"X 1-1/2" medal box for the antenna and power supply connections.
The unit does not transmit but receives fine. The SWR is okay.
Trouble shooting suggestions would be appreciated.
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Re: Maxon Model MCB10A
In order to test this unit you will need a power meter with a dummy load. connect the power meter and turn on the unit, key the microphone and look at the power meter it should have a reading of < 4 watts PEP unmodulated and = 4 watts PEP modulated.
If you do not have this reading the RF transmitter in the CB might be malfunctioning. You will need a RF generator, a power meter with dummy load, oscilloscope and a multimeter to troubleshoot this problem with. If you do not have or do not know what this equipment is or how it works, please take your unit to a CB repair shop.
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The IC-V8000 is a high power (75 watts) 2 metre radio, it will draw about 15 amps on transmit. Also you might want to make sure your antenna SWR is low about 1.5:1. If you are not receiving anything at all I suspect you may have an antenna issue and this will also effect your transmit as well as the radio will protect its self by reducing the output to almost nothing if the antenna has a high SWR. If you don't have an antenna analyzer check with another amateur radio operator they may know someone who does. Your local amateur radio club most likely will have someone who help you solving your antenna problem.
Most problems with radios that receive but do not transmit are antenna or antenna wire/connector issues. It's easy to receive with a marginal antenna but transmitting requires a good working antenna. If you have a SWR meter or can get your hands on one, install it in line with the antenna and test for reflected power. Of course, make sure your TX light comes on when you depress the mic switch. If not, switch mic and try again. Hope this is helpful! Reply if u can.
There are a variety of reasons for your Spectra to fail to transmit. A few items to check would be: 1) Power to the radio. If enough power is not present, transmit is the first thing to usually fail. 2) Check your hand mic. This is a common failure part on a mobile radio. 3) Check your antenna and connections. Coax ages over time, and is not forgiving of creases or bends. Also, if your antenna stinger has become loose over time, it will effect your transmit.
Beyond the above mentioned items, most anything further would require repair of the component board of the radio.
Maybe its not transmitting because a Final Transistor has blown. Check to see if it receives well, change antennas,microphone...get a meter to measure SWR/POWER out. If it don't transmit or receive it may be seriously damaged. A final only cost several dollars if you know how to solder one in place. Its always like 2SC2078(Radio Shack carries them) it has 3 prongs to be soldered on the board with a heatsink and screwed to back with a ceramic insulator and heat glue. Swr over 2.1 will cause transmitter damage. Bad antennas,lightning may cause these problems. Get an antenna factory tuned at near 1.5 for 27mhz.Wilson 1000's,K40,Antron A99(18 ft.base) are good antennas.Look at www.copperelectronics.com for radio supplies,antennas and new radios.
Just to clarify something, you say that your hand-held VHF can receive a clear transmission from the Uniden, now which of the radios are buzzing, the Uniden or the HH?. If it's the hand-held buzzing try transmitting on the low watt on the Uniden, get some distance from the radio, because if the hand-held are to close to the on the Uniden on high watt you will get a buzzing, the signal are overpowering the receiver of the hand-held, try getting the minimum of 30 feet away. Good luck.
You may have a bad antenna. What happens is a lot of guys carry their radios around by the antenna, inside the connection to the antenna is weak and can crack at the solder joint, thus opening up the antenna circuit and prevent you from transmitting any power out. Our Motorola hand helds have this problem, they are weak at the antenna connector and guys swing them around by the antenna end up breaking them. Your next problem is that if the radios have been used often enough with a faulty antenna circuit, your final amplifiers are probably toast from transmitting into an open antenna circuit, causing all the power to be reflected back into the radio and burning out the final amplifiers
Make sure you run the CB directly to the battery. What you are hearing is the alternator whining. Even then sometimes a low pass filter may be necessary. Make sure the chassis of your CB is grounded with a copper braid strap too.