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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It has been my experience over the years that manufacturers generally do NOT want to give folks like us the option of repairing their equipment. You can try asking the Uniden service department, but I'll wager they want a minimum of $100 for the schematic/service manual, which pretty much puts you into the price for a new DSC-capable radio.
Welcome to the world of disposable electronics.
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.
First, check your antenna, could have been struck by lightning or corrosion could be setting in, if it's corrosion you would not be able to see it. Before going into your radio, try the radio with a different antenna. You never mentioned weather the radio are transmitting or not, knowing this the technition would have a better idea where to check for the problem. Good luck.