VHF Problem - SailNet Community

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Go Back   SailNet Community > On Board > Gear & Maintenance > Electronics
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Old 03-27-2010
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VHF Problem

My VHF receives and transmits on low power just fine. However, when I switch to high power it resets itself (it won't allow me to transmit). I've checked the connections at the VHF and DC panel and they appear ok.
I have not yet checked the connectors at the mast/deck location, but I intend to check them tomorrow. If these are ok my next step would be to check the connections at the antenna on top of the mast, but this will be more difficult/troublesome. Before I try and get to the top of the mast, does anyone have any suggestions or experienced this problem themselves? Thanks for your help.
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Old 03-27-2010
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Schred, unless you have a faulty unity, I don't think it could happen due to any antena install. It seems most likely to be a faulty DC power to the unity, improper grounding as when you demand more power your radio fails. Try to measure the DC at radio side and PTT at high, it's possible you're geting a voltage drop.
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Old 03-27-2010
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May want to check your cable with a SWR Meter, it should read as flat as possible. Could also be a short in your 259 plug connection. use a ohm meter and look for a short at both ends of your line at the connectors.

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Old 03-27-2010
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I'd second what Negrini said. Have you checked the wiring for resistance and voltage drop? Have you checked the voltage at the back of the VHF unit? A 25 watt VHF unit may be using over 5 amps, depending on the model when transmitting. If the wiring is corroded or there are bad connections, it may not be capable of providing that kind of power, and that could easily cause the VHF unit to reset.
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Old 03-28-2010
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Thanks for the advice. I will continue to troubleshoot!
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