Most modern VHF radios do not use an antenna relay. PIN diodes do the
switching now. This doesn't sound like a defective PA module. I would
look, first, for an intermittant connection. This could be ata connector,
or cold solder. Good hunting.
On 10 Sep 2001 firstname.lastname@example.org wrote:
> I have a 3 year old FT-2500M. All has been working until last week. Let me
> tell you the problem and see if you might have an opinion of a solution:
> 1. Receive Ok
> 2. Transmit - Full output and then NOTHING. Right in the middle of a
> sentence, output to zero.
> Then after a minute or two, full output again, may last the whole qso.
> I first thought it might the high SWR on the antenna causing the shutdown.
> But the antenna checked ok, and I moved the rig in the house and put it on
> the station antenna and later on a dummy load. Same problem. Hi/med/low
> power setting made no different.
> The 3 things that come to mind that could be the problem are:
> 1. BAD PA.
> 2. BAD antenna relay
> 3. BAD SWR circuit.
> Anyone have any ideas? The PA is $90.00. So Sending it to Yaesu, postage
> and parts would exceed the cost of a new rig.
> Also if anyone has a circuit diagram that they could send me I would
> appricate it.
> Joe K0BX
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