Topband: Invisable Fence Issues

[James Wolf]

Scott,

I had this problem sometime back.  I borrowed the neighbors fence generator
and found that pulse was a 15 kHz square wave at around 30 volts.
What you want to do is round off the square wave to lower the harmonics.
I added a small series resistance to buffer the output device, series
ferrite beads and some capacitance to ground just before the output
terminals.  It rolled off the higher frequencies enough that it was no
longer noticable in the radio on 160.  Can't tell you the values, it's been
15 years ago, but you should use a scope at any rate.  
It made a very slight difference on the "width" of the effective fence.


James Wolf, KR9U


> -----Original Message-----
> From: topband-bounces at contesting.com 
> [mailto:topband-bounces at contesting.com] On Behalf Of KQ8RP
> Sent: Wednesday, February 11, 2004 6:34 AM
> To: topband at contesting.com
> Subject: Topband: Invisable Fence Issues
> 
> 
> Can anyone provide me any help in how to cure noise issues 
> generated by neigbors invisable fence?  It causes noises 
> about every 10khz about 10 over S9.
> 
> Any ideas?
> 
> Thanks
> Scott
> _______________________________________________
> Topband mailing list
> Topband at contesting.com 
> http://lists.contesting.com/mailman/listinfo/> topband
>