[TowerTalk] Topband: RFI

[Neal Sulmeyer]

​I have had one for over 20 years.  First thing I did was to disconnect the "rabbit ears" and connect the input to a BNC connector.  I use a 4 element 144 mhz.  Works just fine.

MFJ also makes an ultrasonic detector with a parabolic dish.  This has not been useful (yet).

Neal, K4EA  

On Thu, 06/25/2020 06:52 PM, Mike Ryan <mryan001 at tampabay.rr.com> 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 [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
> 
> On 06/25/20 16:25 PM, Don Kirk wrote:
> > Hi Fred,
> > 
> > Do you have a police radio scanner that covers the aviation band?  If so
> it
> > makes for a great 136 MHz AM receiver that can be very helpful in
> narrowing
> > in on the faulty pole especially when a portable directional antenna is
> > connected to it (especially if you can throw in 20 or 30 db of attenuation
> > when very close to the pole).
> > 
> > HF makes identifying the faulty pole a very difficult if not impossible
> > task.
> 
> 
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