I need help trouble shooting my new marine radio and antenna; it appears that I transmit but can not receive calls. I can hear some of the weather channels but that's all. Components are:
Antenna is a DIGITAL 528-VW VHF 4FT 4.5DB by Digital Antenna
Radio is a COBRA MR F75 VHF W/ DSC25 WATT
Installation was pretty much plug and play not having to cut or splice the antenna coax using the factory installed connector and the power was connected by wing nuts on top of battery. I have talked with customer support representatives from both companies and they each suggest the the problem is with the other unit. i need to know how to pinpoint the problem; is it installation, radio or antenna? Any help would be greatly appreciated. thanks keith
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Re: Transmits but does not Receive
Check your microphone by swapping with another duplicate. If no differance, you will need a SWR meter (standing wave ratio) to find the culprit. It attaches in line of the coax and determinds power out and reflected power. The reading should be 25 watts foward and max of 1 reflected.
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Check coax continuity with a VOM/ continuity tester. Make sure the braid and center conductor aren't touching. OR, put the radio on an antenna system that is known to be working and see if receive works. If after these tests you still don't hear anything, You may need to talk to a repair technician.
Simrad RS82. Ok, can you switch to 1 watt and see if it transmits on low power? If it does, check all wiring and your power source (battery or power supply) for enough voltage. Marine radios often get corrosion on connections. Later, check your external antenna and connectors. Of course, you can never transmit on the pre programmed weather channels.
Sounds like a bad receiver in the radio.
Have you checked the VSWR of you antenna system?
Did it ever work with the current setup?
If so has anything changed with the programming of the radio or the antenna system?
Does 70cm work OK?
Are you sure menu item 080 is set to "SQL" and not "RF-GAIN"?
Are you sure the receiver is not programmed for tone squelch?
Either of those settings could cause receive problems if not used properly.
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.
If the radio device has a variable strength setting for transmission, set it at the higher value... for example 5 watt as opposed to 1 watt. Also, ensure you have a quality antenna. Radio signals are usually line of sight signals, so if there are many obstructions between the radio antenna and the receiver/listener, strength of signal can be affected.