[Flexradio] ...odd signals...

[n3wt at comcast.net]

Yes,  should had said a high pass filter.  . 



this is the filter  used, which does eliminate the electric fence RFI.  


http://www.iceradioproducts.com/filtersrf.html 



The Model 402X.    Cuts off below 1.8 Mhz.     Intended for BCI. 





John, N3WT  



----- Original Message ----- 
From: "L&S Kubis" <lkubis at cogeco.ca> 
To: "John Sweeney" <n3wt at comcast.net> 
Sent: Thursday, October 1, 2009 12:04:31 PM GMT -05:00 US/Canada Eastern 
Subject: Re: [Flexradio] ...odd signals... 

Just a little clarification John ---- did you mean a high pass filter in the 
RX line?? I can't understand how a low pass might work, perhaps I missed 
something!! I'm not familiar with these dog systems!! 

I also have noise problems at a remote site but from a huge UPS system 
running at a few hundred Khz with sidebands up to 40m!! Not sure if it will 
be possible to filter these out!! 

Cheers! 
Lloyd 
VE3ERQ/VK4ERQ 


----- Original Message ----- 
From: "John Sweeney" <n3wt at comcast.net> 
To: <tpcj1r03 at crocker.com>; "Jim" <technology.magic1 at verizon.net>; 
<flexradio at flex-radio.biz> 
Sent: Thursday, October 01, 2009 11:17 AM 
Subject: Re: [Flexradio] ...odd signals... 


>I also live out in the countryside on a dead-end road in the middle of a 
> corn field with 12 houses on it.  Anyway, I had the same spurious signals 
> as 
> you describe , mostly on 160 meters and 80 meters.  I discovered it was 
> from 
> an underground dog fence nearby.  The dog fence owner was understanding 
> but 
> not very cooperative. I did not push it either.   The neighbor would turn 
> off the fence and the signals then disappear.  My big dog often runs in 
> their yard to play with their dog.     A BCI low pass bandpass filter in 
> the 
> receive loop from I.C.E. took care of the problem completely. 
> 
> John  N3WT 
> 
> 
> 
> -----Original Message----- 
> From: flexradio-bounces at flex-radio.biz 
> [mailto:flexradio-bounces at flex-radio.biz]On Behalf Of John Ragle 
> Sent: Thursday, October 01, 2009 10:23 AM 
> To: Jim; flexradio at flex-radio.biz 
> Subject: [Flexradio] ...odd signals... 
> 
> 
> Jim... 
> 
>    I live out in the countryside on a dead-end road (in the middle of a 
> corn field) with 12 houses on it. My panadapter screens on almost every 
> band are filled with spurious signals that go away when I remove the 
> antenna (or connect to a 50-ohm dummy load). I have tried turning off my 
> WiFi router (no relief), my wife's computers (no relief), disconnecting 
> my cable modem (no relief). Similar spurs show up on my non-digital 2 
> meter rig (IC-910) with all the household computers and the modem off, 
> and those also go away when I disconnect its antenna. The most common of 
> these spurs is a cluster of 3 narrow signals spaced by 1 or 2 kHz and 
> occurring every 90-95 kHz or so. They do not appear to be a carrier and 
> sidebands. Some of the spurs wander slowly across the spectrum at a rate 
> of a few kHz an hour. 
> 
>    My cable service and all my other services are /*underground*/ up to 
> the house. I have not tried shutting down the power to the house 
> (awkward), but conclude these are real signals emanating from the 
> neighborhood. The nearest above-ground power, phone, and cable lines are 
> at least 500 feet from the house. Many of my close neighbors run 
> computers of unknown vintage. My choice is either to hire out a "fox 
> hunter" or ignore the spurs. By now, the spurs are "old friends." 
> 
> John Ragle -- W1ZI 
> 
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