My uhf transmits but cannot recieve?

I am not an expert but I think there can be little or no modulation of the carrier wave unless there is an audio input to the modulator. Like any audio amplifier a transmitter modulator (amplitude modulation) is quiescent without an input.

If the modulation amplifier and audio pre-amp are working and modulating the carrier wave and the antenna is ok then audio modulated radio frequency must be being transmitted.

It would be an extremely good quality CB that had a modulation meter. Mostly all they have is a meter giving an indication of the rf power being sent to the antenna and that rf (radio frequency) power would be the same whether modulated or unmodulated.
The modulation envelope, incidentally, is traditionally viewed or measured with an oscilloscope.

The indicated rf power could be verified using a field strength meter but the only practical way to discover if a standard CB is transmitting modulated rf is to listen to the transmission on a suitable receiver. If the squelch is turned down it will be obvious if the rf carrier wave is being received as the hiss would be silenced. If no audio is received it can be assumed none is being transmitted.

I suggest you try another microphone and lead and if that doesn't work it is clearly a job for a repair shop.

The IC-T8E is the Icom VHF / UHF Amateur (or "Ham") transceiver capable of wide-band AM & FM receive and 6 meter (50Mhz - 54Mhz) , 2 (144Mhz - 148Mhz) meter and 70 centimeter (430Mhz - 450Mhz) FM only transmit - when appropriately licensed by your country's communications authority.



RigPix Database Icom IC T8E



Any FM transmitter operating in those frequency ranges will be received and played thru the speaker - unless they are encoded with a squelch decode sub-audible tone or digitally encoded squelch control that does not match the one set to the IC-T8E. Program the squelch to be open or to match that of the transmitter so that the radio will play only when that particular transmitter is transmitting.



An FM transmitter operating in APCO25, DSTAR, etc. will not be decoded as these are digital signals that the ICT82 is not capable of decoding.



I was unable to locate any "BP200" radio you mentioned, so I can't comment on their capabilities or if they have an incompatibility in encoding, frequency, etc.

The microphone has adjustable wheels, usually behind the batteries in the battery compartment. The wheels/switches allow you to set a frequency. Set the reciever unit and the microphone for the same frequency. Make sure the batteries in the mic are charged.

Try a different microphone. If the mic is bad or a wire is broken it will cause this problem.

You may have a bad microphone, not uncommon problem.

T squelch and PTT on can be reset by button presses. It's shown in the manual, available for free online in various places.

1. Check microphone(s) batteries and replace if the
charge is low.
2 Remove local sources of UHF interference, such as
lighting equipment.
3. Adjust the squelch controls on the front of the UHF-
5800 receiver.
4. Signal may be too weak. If so, reposition antennas.
If possible, move them closer to the transmitter.
5. Reposition the receiver, perform a "walkthrough",
and observe the signal strengths. If audio dropouts
persist, mark these "dead spots" in the operating
area and avoid them during the performance.
If none of these could help it is possible that the device has really some faulty operation and needed to carry it to service center.
Good luck!
gylacz

Begin with

• Volume knob 12 o'clock position
• Squelch knob full counter clockwise
• RF gain knob full clockwise
• Pa/CB switch to CB
• Mic plugged in
• Check coax and antenna connections.

• Make sure your antenna gommet/insulator is installed correctly or it will directed gound. Treat antenna shaft as it is the positive portion of circuit.

If you have another CB check the antenna system with that rig. To verify it is a radio issue. Then dig deeper Microphone, PLL chip, Audio chip etc.

REPLACE THE FINALS,does it come on?

Check the squelch on your radio thats not recieving. If there is a monitor button ( when pushed you will hear static) try pushing it.. then get someone to call you so you can check if you can hear them. On these radios you have 2 types of squelch....1 is called carrier squelch.... it basically opens when there is a strong enough signal. This lets you only hear strong signals and "squelch out" the distant ones and background static. The2nd. is "tone squelch" ... with your radio they are often called privacy tones. If you have 2 radios set with the same privacy tones you will only be able to hear each other... only radios that are transmitting with that privacy tone will be heard on your radio. Its a high frequency tone that can't be hear by the human ear that gets "embeded" with the transmitting signal. The recieving radio hears it and opens the squelch. So... if the radio thats rxing (recieving)your signal has its squelch set for just carrier squelch it will hear any signal thats strong enough to break the squech open.... basicaly any radio within a certain range. But if your radio (one with problem) has its squelch set for privacy tones you will not hear any other radios except the ones set with the same privacy tone.... the squelch will not open until it gets a tx signal with the right tone.... so if the txing (transmitting) radio is not using tone squelch but is using carrier squelch.... and the rxing radio is set for tone squelch... the rxing radio will not hear it. With tone (privacy tones/codes) squelch you need a tone to open the squelch and then the audio can be heard... with carrier squelch the squelch will open if ANY radio is within a certain range. Check the squelch setting on the problem radio... it could have a privacy tone set. Try pushing in the monitor button so you can hear static ( you want to hear everything including static) on both radios... tx on one radio at a time and listen if it can be heard on the other with the monitor button pushed. If you can't hear any audio when the broken one is transmitting then it COULD be the mic.... if you can hear both radios with the monitor button activated than the radios are txing and have tx audio and are working... if thats the case its the privacy tones that are the problem. Take care