[Amps] please help with weird problem - culprit found

[Joe Isabella]

Before you guys start filing class action law suits, don't you think you ought to consider that RF getting into a rig happens all the time and can't always be designed out??  My Icom 706 popped a transistor in the remote control interface circuits like that.  Had nothing to do with a second receive antenna, or the like.  I have a friend that popped the input to a boat anchor receiver with a second antenna up in the air.  No, it wasn't connected directly to the rig, it *WAS ISOLATED* with a change-over relay and there was still enough energy there from his Globe King 500 (~375W AM carrier, no modulation) to damage it.  He only figured out where it was coming from when he got an RF burn from the coax when he was looking for it.  It's ironic that a lot of us spend enormous amounts of energy trying to keep RF out of the shack, just to get "surprized" when it shows up via another antenna lead (channeling RF back inside intentionally)...
 
So do we know for sure that the second antenna even if isolated wouldn't have caused a problem??  Maybe, maybe not.  Ain't RF a wonderful (but sometimes ruthless) thing??  
 
:-)
 
Joe, N3JI
 

Will Matney <craxd1 at ezwv.com> wrote:

I don't think he's at fault either, and to me they owe him a repair job
or new rig IMHO. That equipment costs too much for something like that
to be thought of. If they knew it was this way, and did not have it in
the operations manual, that's just wrong and they owe him. There's
nobody that ought to have to read a schematic to see how one is before
they ever use it. That's BAD engineering practice if I ever seen it. If
I was Don, I'd call um up and raise he** until it was settled! Plus, I'm
glad he told it here so I know about Icoms, and whether I could trust
them now on what they make.

Will


> On Mon, 31 Jan 2005 14:03:26 +0000 (GMT), Roger Parsons 
> wrote:
>
>> Don is blaming himself for this problem.
>>
>> My feeling is that Icom should not offer/have offered
>> equipment with a defective design!
>>
>> All Don did was to connect an auxiliary receive
>> antenna to the auxiliary receive antenna connection.
>> The rig fails to operate correctly in those
>> circumstances and ultimately fails catestrophically.
>> It is quite unreasonable to expect a user to closely
>> examine a microscopic schematic before using the
>> equipment, particularly when the proposed usage is
>> described in the operating manual.
>>
>> FWIW, I am sure that all the older Icoms suffer from
>> the same defect, and suspect that many other rigs from
>> most manufacturers are the same.
>>
>> 73 Roger
>> VE3ZI
>>
>>
>>
>> 
>> 
>> 
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