[TowerTalk] Topband: RFI

[Steve Maki]

I should have made that clear, yes you start off at lower frequencies, 
and gradually tune higher & higher as you get closer to the source. I 
found it to be the fastest method with what I had at the time to home in 
on the trouble. The problem is that in certain band segments it's hard 
to find a quiet channel to listen for noise on, which means you need a 
quality receiver with some semblance of selectivity.

-Steve K8LX

On 06/25/20 18:52 PM, Mike Ryan wrote:

> As I recall that MJF handheld noise 'sniffer' is actually on the 137mhz band
> (just above the air band I think?)  I've used those to some extent though
> the recvr is not selective that's actually a good thing!  - M
> 
> -----Original Message-----
> From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of Steve
> Maki
> Sent: Thursday, June 25, 2020 5:04 PM
> To: towertalk
> Subject: Re: [TowerTalk] Topband: RFI
> 
> Many years ago when I had a bad location for line noise, I used a
> wideband scanner that could be kept in AM mode over the whole range of
> frequencies, and a small VHF/UHF TV log-yagi with a battery powered
> preamp. As you get closer and closer to the noise source you can start
> picking up the noise up around 450 MHZ and higher, and it's much easier
> at higher frequencies to pinpoint the exact pole. Never tried an
> ultrasonic RX, but that sounds like it should work well. When you get on
> top of the source, you can often hear it plain as day with no device at
> all, just your ears.
> 
> Yes I was asked a couple times to remove myself from someone's property :-)
> 
> -Steve K8LX