Question about Raymarine Ray45VHF (53 Channels) 2-Way Radio

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VHF Radio The VHF radio on our boat is able to transmit clearly and over long distances of 35nm, however we are unable to receive any responce over about 6nm. Are you able to suggest a solution?. Kind Regards, Capt Geoff Botha

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Check ther frequency tuning.
Sounds like it is off frequency.
Is the VSWR on the aerial Ok

Posted on May 26, 2008

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Posted on Jan 02, 2017

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The big question is how do you know your radio transmits 30 miles but receives only 6 miles?
Clearly you have a friend with a transceiver and you have been playing around together until you formed those conclusions.

What if the other radio received well but didn't transmit so well? Have both radios been checked with a field strength meter to ensure they are both radiating similar power outputs?

Do you receive the carrier wave but no audio at a range greater than 6 miles? If so your friend's radio (and others) might have a modulation problem. Has the signal(s) been analysed with an oscilloscope?

It is often imagined the transmission envelope is circular radiating from the antenna at the centre but that is often wrong. The radiation envelope is often distorted by a ground plane. Imagine an antenna mounted at the centre of an aluminium boat hull, the radiation envelope would be elliptical in line with the hull.

Even with a fibreglass hull the presence of metal masses can pull the radiation envelope out of shape lengthening the range of both transmission and receiving in one direction and shortening them in another.

There is another possibility to poor reception and that is a high amount of interference that might be airborne being received by the internal radio circuitry, by several means - antenna or the poor screening of the downlead and could be aggravated by poor grounding. Interference can also be on the supply line and both types can be generated by a host of electrical or electronic equipment.
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The basic radio of the old days could have the Squelch turned off and an experienced operator can hear much of what is or isn't happening.

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