[Elecraft] K3: 6M SSB audio hash

[Don Wilhelm]

I usually avoid public testimonials, but in this thread, I choose to 
make an exception.

For those who have interest in this discussion, I notice that Jim Brown 
has been a bit bashful in stating his credentials.  Jim has extensive 
experience with EMC and RFI in both ham radio and pro-audio systems.  
Take a look at  http://www.audiosystemsgroup.com/bio-jb.htm for his 
professional pro-audio profile, or for something more ham related, look 
at http://www.audiosystemsgroup.com/K9YC/k9yc-bio.htm.

For those interested in his technical publications, they can be seen at 
http://audiosystemsgroup.com/K9YC.htm - it is an extensive library.

I consider Jim's work to represent examples of good engineering practice 
in the fields of Pro-Audio, EMC and RFI.

Keep up the good work Jim - you and your research are a great asset to 
the amateur radio community.

73,
Don W3FPR

Jim Brown wrote:
> On Sun, 8 Jun 2008 20:33:15 -0400, Joe Subich, W4TV wrote:
>
>   
>> I'm aware that a short jumper is "wrong" from the purist point 
>> of view.  However, it is much better than mic return that is 
>> held above ground by an RF choke!   Most of the rigs I've seen 
>> have relatively good grounding for the "PTT ground" - the jumper 
>> is 1 cm or less or the circuit board layout includes the "PTT 
>> Ground" pin in a wide (large) ground plane.  
>>     
>
>   
>> Fortunately, most amateur equipment is not operated in strong 
>> (multi hundred KW ERP) UHF fields.   
>>     
>
> This is NOT purist. The cell phone interference being discussed in 
> another thread could easily be the result of a jumper that short. It is 
> in those mics!  The field is determined by inverse square law. A 2W 
> radio (cell phone) puts a pretty strong field at 6-12 inches. Back in 
> Chicago, I ran 160M and 80 on a long wire that ended at the transmitter. 
> With only 13W (K2 barefoot) I could lock up the keying loop between the 
> computer and the radio. 
>
>   
>> Which article?  I used many of the Neuman and AKG mics 30 years ago 
>>     
>
> The AES paper on RFI in condenser mics has the greatest detail. I've 
> summarized it and used it tutorially in other publications. 
>
> 73,
>
> Jim Brown K9YC
>
>
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