Question about Cobra Mr F75b Marine Vhf Radio Fixed Mount 25watt

2 Answers

Transmits but does not Receive

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

Posted by on

2 Answers

  • Level 1:

    An expert who has achieved level 1.

    Hot-Shot:

    An expert who has answered 20 questions.

    Corporal:

    An expert that has over 10 points.

    Mayor:

    An expert whose answer got voted for 2 times.

  • Contributor
  • 35 Answers

Did you check to see if it's switched on US and not on International?.

Posted on Jul 13, 2013

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that got 5 achievements.

    Governor:

    An expert whose answer got voted for 20 times.

    Scholar:

    An expert who has written 20 answers of more than 400 characters.

  • Expert
  • 157 Answers

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.

Posted on Oct 28, 2008

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

I need a schematic for a uniden MC 480


Sorry David
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.
Good luck
-Steve

Nov 14, 2014 | Marine Electronics

1 Answer

Transmitting and Receiving fault


Ray marine has an extensive library on-line. I have usually been able to find what I need there. May take some digging though.

May 10, 2014 | Raymarine Ray218 Vhf Radio

1 Answer

My radio will not transmitt but it receives just fine


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.

Oct 06, 2012 | Uniden Solara DSC VHF Marine Radio

1 Answer

My radio transmits fine. Until recently it received fine. Now it transmits but it does not receive. I've played with the squelch and volume. No luck. Can you advise.


Your finals are fried. Take it to a shop and they will fix the finals. Before you do that be sure to put in an extension speaker just to be sure. Most CB shops are inexpensive.

Aug 29, 2011 | Uniden Solara DSC VHF Marine Radio

1 Answer

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...


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.

Mar 28, 2011 | Uniden UM525 ES Series VHF Radio with...

1 Answer

Radio transmits at close distance only.


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.

Mar 11, 2011 | Cobra Marine Electronics

1 Answer

My UNIDEN UM525 receive only near and strongly stations


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.

Jan 17, 2011 | Uniden UM525 ES Series VHF Radio with...

1 Answer

I can receive only the strongest signals eg from USCG or very local transmissions. Antenna cable connections checked out. Nobody can receive my test transmissions. Do I need a bench test of my set?


Try a new antenna first. If you have the same results and the PL259 connector is the solder type and it is soldered properly then I would take the radio to a test shop for them to test.

May 24, 2010 | Uniden Gps Intuitive Fixed Mount VhfDual...

Not finding what you are looking for?
Cobra Mr F75b Marine Vhf Radio Fixed Mount 25watt Logo

699 people viewed this question

Ask a Question

Usually answered in minutes!

Top Cobra Marine Electronics Experts

Donald DCruz
Donald DCruz

Level 3 Expert

17129 Answers

Electro Med Services...
Electro Med Services...

Level 3 Expert

5653 Answers

Jim Verge
Jim Verge

Level 1 Expert

60 Answers

Are you a Cobra Marine Electronics Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...