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Old 10 January 2013, 11:41   #1
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VHF signal

just going through the yearly todo list (why is it always so long :-)

last season while doing my normal pre sail coastgaurd check they said they were struggling to hear me. i can hear them no probs. i confirmed it was not location based as i sailed to outside the station and done same thing with same results on a diff day.

i assume i have a problem in the system somewhere but not sure where to start, open to ways to proceed here?

remembering i can receive ok i'm not sure?

cheers
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Old 10 January 2013, 13:35   #2
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Check you radio isn't set to low output power.
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Old 10 January 2013, 14:04   #3
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Do check if different with the engine running or not... sometimes the noise of the engine via the microphone, or electrical interference via the wiring can cause that, and so be fine when the engine has stopped. Good to try with a mate or your backup radio (?) ... and of course only transmit when on the water :o)
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Old 10 January 2013, 14:36   #4
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All of those. Also - was the mic very wet? I've seen that knock out comms mysteriously...

wurble wurble wurble
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Old 10 January 2013, 15:10   #5
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I had that,it was a bad conection on the aeriel,easy fix!
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Old 10 January 2013, 16:49   #6
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Agree, go for the connections first. Solder em!
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Old 10 January 2013, 18:23   #7
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thanks for the suggestions folks, will go through them in due course and see how i fair.

i can rule out water in mic or it is set to low power. so i assume that leaves the coax/connectors or the antenna.

cheers
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Old 10 January 2013, 18:40   #8
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I had an odd one once - the power supply to the radio was poor (blackened copper) and when I tried to transmit - the set would drop into low TX and then pop back to Hi afterwards. It took me quite some time to spot it and work out what was wrong. Might be worth a peek...
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Old 10 January 2013, 19:12   #9
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Do you recall if the CG said they could not hear you because of low signal strength (transmit issues?) OR poor readability (ie strong signal but audio problems) as that will give you some very useful clues too. Or else try do that check with someone to determine.

So "assume that leaves coax/connectors or the antenna" would most likely not be the defect if strong signal but poor readability was the symptom.

Steve (ex-comms engineer)
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Old 11 January 2013, 09:55   #10
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steve, the CG never mentioned any of that unfortunately. i can get a handheld and comm with the boat and check for myself though if it will assist.

cheers
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