[TenTec] RFI into Orion II

[Jim Brown]

Let's get our words straight. First, a cable shield is a SHIELD first, 
and a circuit conductor second. It is NOT a "ground." For a shield to 
WORK, it MUST be connected directly to the shielding enclosure at both 
ends. That is a fundamental principle of shielding -- it must be 
continuous. Sadly, virtually all mfrs of ham gear fail to understand 
this, and tell us to do things that are simply WRONG.

A cable shield that is NOT connected directly to the chassis at the 
point of entry is a CAUSE of hum, buzz, and RFI. Failure to follow that 
fundamental principle is known in the audio world as "the Pin One 
Problem," and was first exposed by Neil Muncy, ex-W3WJE (SK), in 1994.

There are several tutorials on my website about this, and I urge all to 
study them.
k9yc.com/publish.htm

  I will NOT waste my time by repeating that tutorial work here for 
those who are too lazy to read what I've already taken the time to 
write. :)

73, Jim K9YC

On Sun,2/21/2016 3:37 PM, Sergio Escudero wrote:
> Hi to all, the problem is the ground with the microphone (must) be separated from the chassis ground, separate the mic capsule ground from the shield and radio chassis see figure 2.4 of mic connection  me and a local friend we have wire several mic to the Orion2 , this will fix the RFI problem W4ESA