[RFI] IN-band Filters

Jim Brown jim at audiosystemsgroup.com
Tue Nov 7 19:30:40 EST 2006

On Tue, 7 Nov 2006 17:00:14 -0800 (PST), Bryan Swadener wrote:

>We have use of a site that will allow up to about 1000' separation. 

That is by far your best solution. 

As the architect of some competitively scoring FD stations, I agree 
with others who have noted that stubs dont have nearly enough Q, 
and that heroic measures are needed to achieve even a little in-band 

Your choice of 100 watt radios like the K2 that are relatively clean 
and have very good receivers is the right approach. TS850s make 
good FD radios too. Avoid cheap radios (FT100, IC706, IC746, etc.) 
like the plague. Their receivers overload easily, and their 
transmitters are broad as a barndoor too. 

Likewise, having high flat dipoles for stations on the same band at 
right angles to each other helps a bit. So do baluns, IF they are 
good enough to take the transmission line out of the picture. But 
dont expect much help from low dipoles or inverted Vees. 

Jim Brown K9YC

More information about the RFI mailing list