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Old 26 June 2010, 04:15   #1
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NAVMAN 7100 reverting to "Lo" TX

I've been using a 7100 for a couple of seasons with no issues. Just recently (IOM Cruise) it has started to show a glitch - when trying to TX on 25W, it shows the "Lo" symbol. Obviously I'm not a happy camper

A few things:

I've swapped out the antenna/cable for a standalone and the fault remains.
The co-ax socket on the set seems ok.
The range of the set/glomex stills seems good - tests with the CG suggest a range of at least 20Nm.
NAVMAN's manual suggests this is an antenna fault - the swapout suggests not?
There is no dampness in the set - when not in use it gets dried and covered (flush mounted)

Any ideas? You know the kinda thing I want, like wierd common Ground issues or something fixable
_____________
As an aside - I've seen a few 7100s with corrosion issues at the Volume and Squelch knobs - any owners had similar?
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Old 27 June 2010, 14:16   #2
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Not resolved yet but more data:

When the engine is running or the battery charger is on - the problem goes away. The battery starts the engine fine so I'm wondering about a poor connection somewhere on the circuit.

I just don't get how that would work...

Obviously the charger/motor is supplying something like 14v, and the battery only 12v. Could this overcome a loose/poor connection?

More experiments tomorrow it seems
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Old 28 June 2010, 05:36   #3
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1) Are you actually getting 12v at the battery when the engine is not running (i.e. could be a battery issue) ?

2) If so, are you actually getting 12v at the rear connection to the radio when the engine is not running (I'm guessing not) ?

My guess would be that if one or more cells are starting to show problems in the battery, then you may get enough current to kick the starter into life (which tends to run at a lower voltage anyway due to the high current flows are resistance of various leads) but not enough voltage to keep the radio happy.
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Old 28 June 2010, 05:54   #4
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Willk,

Someone last year reported a similar problem: http://rib.net/forum/showthread.php?...=vhf+low+power
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Old 28 June 2010, 15:29   #5
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Thanks for the replies guys - I've just got off the rib and read them!

It was a poor connection at the (Navman fitted) bullet connectors and not my own duff wiring - go figure! They looked perfect, no corrosion or dampness, but problem was resolved when they were bypassed. I think the problem here was Amps, not Volts.

I also found a poor connection at one battery - glad to have nailed it too - could have ruined a day downstream, worth checking this stuff periodically I guess.

I'm headed for Tory tomorrow - happier now with sorted Comms
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Old 28 June 2010, 15:33   #6
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Quote:
Originally Posted by willk View Post
Thanks for the replies guys - I've just got off the rib and read them!

It was a poor connection at the (Navman fitted) bullet connectors and not my own duff wiring - go figure! They looked perfect, no corrosion or dampness, but problem was resolved when they were bypassed. I think the problem here was Amps, not Volts.

I also found a poor connection at one battery - glad to have nailed it too - could have ruined a day downstream, worth checking this stuff periodically I guess.

I'm headed for Tory tomorrow - happier now with sorted Comms
Glad you got that sorted Willk
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Old 28 June 2010, 17:50   #7
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Glad you got that sorted Willk
Quote:
Originally Posted by willk View Post
As an aside - I've seen a few 7100s with corrosion issues at the Volume and Squelch knobs - any owners had similar?
(Thanks)

... and 7200s
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