And, I forgot what rig you're using.  On the older Kenwoods, you have to 
ground the mike to the side of the rig to help with that.

----- Original Message ----- 
From: "Colin McDonald" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, April 16, 2013 11:29 PM
Subject: Re: mfj 931


> Usually a shock like that is due to excess RF on the chassis of the radio
> and from that to the microphone.
> It sounds like you are getting allot of RF back down the coax.  Did you
> install a balun or make a coaxial choke at the antenna feed point?
> If you are getting RF back down the shield of the coax, it'll cause RFI 
> like
> crazy and cause the shock to happen.
> Put a 1 to 1 current balun in at the antenna feed point, or make a common
> coaxial balun.  Just 6 or 7 wraps of the coax in a 4 or 5 inch wide coil
> making sure the coax never crosses itself.
> This has to be done as close to the feedpoint as you can get it.
> All the radio and shack grounding in the world won't help eliminate RF
> coming back down your coax.
> If you have a talking swr meter, check your reflected power.  It'll 
> probably
> be very high.
>
> 73
> Colin, V A6BKX
> ----- Original Message ----- 
> From: "Tom Brennan" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Tuesday, April 16, 2013 8:41 PM
> Subject: Re: mfj 931
>
>
>> I'm getting rf on all frequencies from 160m through 70cm although the
>> lower the
>> frequency the more rf and the greater the on air him.  On frequencies
>> below 12m
>> I do get a shock if I touch my mic which is metalic.
>>
>> Tom
>>
>>
>> Tom Brennan  KD5VIJ, CCC-A/SLP
>> web page http://titan.sfasu.edu/~g_brennantg/sonicpage.html