Question about Uniden UM525 ES Series VHF Radio with Hailer

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I have a Uniden 525 fixed mount 2-way VHF radio. It has power and picks up weather with the shakespeare antenna. However radio checks have failed and i don't receive anything either. The antenna's tip is broken, does that severely affects the transmission potential of the unit? If so what antenna should i replace it with?

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Yes if the tip is broken, the antenna will receive, but not transmit properly. The make an antenna that has a 32" stainless steel antenna with a small metal "can". Can mount it anywhere.

Posted on Mar 30, 2011

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Uniden vhf


Hi,

Initially, pls check/clean your antenna, mount, coaxial cable, RF connector, power leads, grounding straps.

Based on your post description, a couple of ideas:
1. Since you receive OK, chances are the antenna/cable is good. You verify though with an SWR meter;
2. Since TX light comes on, looks like the mic, PTT and coiled cord are all OK;
3. All else works but no one can hear you, you have no power output. Use an RF wattmeter with dummy load to verify that you are pushing at least 25 watts. In the absence of a power meter, the SWR would also do or even an indication of a significant current flow to the radio ( use an inline ammeter) would indicate power.
As you will note, some specialized instruments are needed. Perhaps your best bet would be to seek the services of a qualified communications technician. TMore often it is the finals or power pack that fails resulting in no TX. In some cases, it is either the RF diode or the power regulator that causes no TX. It may also be worth your while to do a full check over of your antenna system.

Hope this be of some help. Pls post back how things turns up or should you need additional information.

Good luck and kind regards.

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