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?

No worries here.
According to Uniden, the 6 amp fast blow fuse is the correct one.
Not entirely sure why there'd be a 2 amp with your old radio, but I suspect the radio is good.

-Steve


Uniden VHF radio fuse Google Search

To check your radio you will need a ANTENNA RADIO TESTER Shakespeare make a cheap tester STYLE: ART-3 works good. Good luck.

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.

The antenna is not listed as an accessory on the Uniden web site, so your best bet is to contact their Customer Service department. You can email them by following this link:

http://www.mycusthelp.net/uniden/_cs/QuestionAsk.aspx

Bill B.

It has been my experience that Uniden won't part with their owners manual cheaply. As a matter of fact, you can probably pick up a new radio for less than the cost of a manual.
Welcome to the world of disposable electronics.

Sorry I couldn't be of more help to you.

-Steve

try this link and good luck.........
http://www.retrevo.com/samples/Uniden-manuals.html?cmpid=Manuals_Uniden&s_kwcid=uniden%20manual|4347054231&adsense=2257534859&gclid=CNib_Ii476ACFUpf2godCksrcw

I went to a West Marine store and checked the resistance of a new antenna using an ohm meter.

Sound like you have an antenna issue. Try a different antenna with coax. If the problem is still there, than you have a problem with the radio. Icom makes really good marine radios but you could have a defective one.

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.

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.