[ICOM] IC-756PROIII No Transmit ESD Failures

[Gary Fiber]

Alan,

I could be wrong I thought the Earnhardt's BEV-756 was for when using 
Beverage Antennas attached to the 2nd antenna jack.. When a beverage is 
connected to the 2nd antenna connection and the operator is using a near 
by transmitting antenna or a distant Transmitting antenna with a 
transmit amplifier,. Many times the overload provided into the 2nd RX 
antenna connection will zap the receiver front end.

Since in a transceiver many circuits use common supplies, connections 
and sometimes do double duty this was not uncommon and could affect 
transit also.

You might write them again for clarification that the BEV-756 will 
protect the TR switching diodes especially if you are not using a 
secondary receiving antenna.
Static shows up when you least expect it. Of course a good dust storm 
generates it so does snow storms, Thunderstorm not even near by will 
cause issues.
Maybe installing a static drain on your feed lines will do the trick. I 
have not searched to see some of the lightning protection companies make 
static drains.

Gary K8IZ

On 3/11/2010 6:48 PM, Alan Zack wrote:
> Possible. I use a anti static work pad on the desk where my hand rests
> that is grounded which I would hope would prevent it. It is the same ESD
> work pad that you would use at a work bench doing repairs.
>
> Burghardt stated to me that they have installed 400 of their mods to
> 756's to prevent this from happening with no failures after the mod.
> This seems like a large number but here is the direct quote from their
> email to me. Makes you wonder why Burghardt found the problem and fixed
> it when Icom denies any problem exists.
>
> Sorry to hear of your trouble with the IC-756PRO3.   We do have a module
> which we have produced called the BEV-756 ($79.95 plus labor) which does
> protect against that exact problem.   It is very effective as we have
> had no failures after the install of over 400 modules. Approximate labor
> for repair and install would be $187.50.
>
> ______________________________________________________
> Alan Zack
> Amateur Radio Station K7ACZ
>
>
> ----- Original Message -----
> From: "Dick Flanagan"<dick at k7vc.com>
> To: "ICOM Reflector"<icom at mailman.qth.net>
> Cc:<ICOM756ProIII at yahoogroups.com>;<ic756pro3 at yahoogroups.com>
> Sent: Thursday, March 11, 2010 6:13 PM
> Subject: Re: [ICOM] IC-756PROIII No Transmit ESD Failures
>
>
>    
>> At 01:30 PM 3/11/2010, ALAN ZACK wrote:
>>      
>>> With all my antennas grounded and the P.S. turned
>>> off how would I get ESD to the rig?
>>>        
>> In spite of all your antenna-based solutions, could *you* be the
>> source of the ESD if your body builds up a charge and you zap the
>> radio when you touch the front panel?  Early 7700s have a known flaw
>> where the tuning shaft is ungrounded and you can zap the encoder if
>> you don't ground yourself before you touch it.  Could there be a
>> similar ESD route from the front panel of the P3??
>>
>> Dick
>> --
>> Dick Flanagan K7VC
>> dick at k7vc.com
>>
>>      
>
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