[CQ-Contest] RF on parallel port

[Sinisa Hristov]

VE5ZX wrote:
 
> I am using EA4TX (www.ea4tx.com) rotator controller. It appears that RF is
> getting into the parallel port that used to interface the PC to the
> controller. What is the best way to RF proof a parallel port?


The first thing would be to ensure that no common mode
current flows back from antenna. Use a good "current" balun.
This is necessary, although it may not be sufficient.


73,

Sinisa  YT1NT, VE3EA