Canadian TV, Computing and Home Theatre Forums banner
1 - 4 of 4 Posts

·
Registered
Joined
·
5,194 Posts
Discussion Starter · #1 ·
What do you guys think of this? Was lookin in to the VHF noise / interference issues presented by nearby transmitters. And came across this little circuit hams apparently use to knock down TVI caused by their transmitters to nearby TV Antennas. Has anyone tried building one of these Braid breakers? They are designed to be put in place between the antenna and the preamp. Thinkin it might help the static buildup issue also if ya put a high impedance, 5 to 10 Mohm resistor, across it like ya see in a few of them. So it will serve dual duty. Acting as both a Hi Pass Filter to clean up the input of ur preamp,
and a static buildup bleeder, potentially protecting a sensitive preamp from static...drawback is not sure if they're designed to pass VHF HI since seems like they are popular in the UK (a few apparently are though). Dunno their spectrum layout in UK. Googlin Braid Breaker turned up the below links.

http://www.scribd.com/doc/39570693/Antenna-Filter
http://www.qsl.net/g4lna/pages/braidbkr.html
http://www.uksmg.org/content/filter.htm
 

·
Registered
Joined
·
5,194 Posts
Discussion Starter · #4 ·
Of course i had to make one of these. The first one, as described in the first link.
Need to find a suitable metal project case to install it in, and test it.
 

·
Registered
Joined
·
5,194 Posts
Discussion Starter · #6 ·
The combination of a balun and grounding block, with proper grounding, will eliminate static buildup..
I agree, but tell that to the folks whose preamps blew up from static last year.
I think even Jase88 lost one. And in my opinion, he probably has the most professional setup around. I'm not actually trying to fix anything here, just experimenting. BTW, I'm not expecting this to outperform the homemade highpass filter I made to kill the FM Band locally. But it may be easier to build for the hobbiest. I've never heard of anyone designing an RF filter from semiconductors.
 

·
Registered
Joined
·
5,194 Posts
Discussion Starter · #8 ·
Looks like this circuit has a little attenuation at VHF-Hi, but it really starts to rolloff just below the FM band. The bleeder resistor is there 'cause with the circuit in place otherwise wouldn't be a path for static to bleed off in to ur grounding system. So, it would be a cheap & dirty fix if a HAM was down the Rd from ya on HF & 6M bands. Definitely simple enough to build one to test if that's what u were suspecting.
 
1 - 4 of 4 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top