[RFI] Utility coming tomorrow to chase RFI

[Dale J.]

David, you must use a receiver in AM mode.  FM will not detect noise which is mostly amplitude modulated.  If you have a 10 meter HF yagi see if you can get a rough heading on the noise using that antenna, six meters would be better yet.  Remember noise is amplitude modulated NOT frequency modulated, so you need to listen in AM Or SSB.  An air band receiver works quite well anything cheap will do for close in and it's in the 120 Mhz plus range which is better yet.  The higher in frequency you go the closer you'll have to be to the noise.  126 or so Mhz will work fine and get you in the ball park.  

I have a Icom IC-T7H which does do air band along with 144 meter and 440.  The Alinco DJ-G7 also does air band.  I believe Kenwood has some too.  

GL
Dale, k9vuj



On 03, Jun 2014, at 11:48, qrv at kd4e.com wrote:

> I have forwarded everyone's comments to them - they really want to
> learn - in fact he had been on the ARRL site reading-up!
> 
> Thanks for the good ideas.
> 
> I just discovered that my cheap Chinese HT (Baofeng UV-82) does
> not do Air band AM, sigh.
> 
> I tried opening-up the squelch & walking around but FM isn't the
> correct mode for this.
> 
> What are the recommended Ham handhelds that have VHF (and preferably
> UHF) AM?
> 
> Perhaps one that also has AM on HF so it's all in one package?
> 
> (If HF on the handheld drives up the cost, or compromises RFI-sensing
> features e.g. AM on VHF &/or UHF, I can always still use my pocket AM-FM-SW receiver for the MW/SW sensing.)
> 
> Thanks - David KD4E
> 
>> Is it making noise now?  If not it will be hard for them to find.
>> The best rx I've found so far is an air band receiver.  130 Mhz band
>> and AM and I don't even have a directional antenna, I can get pretty
>> close to the noise source with it.
>> 
>> The old style bell insulators are noise makers, they have a new kind
>> made out of some sort of poly material.
>> 
>> How do the pole tops look, are they rotten or in good shape.  There
>> are bolts that go though the poles to hold up overhead insulators for
>> the primary wire, the top wire which might be 8 or 9 Kv, if the pole
>> tops are rotten the bolts get loose arc and make noise.  The
>> lightning arresters are another one.  Sometimes there are load
>> leveling capacitor banks on some poles.  I believe there are
>> switching networks with them and they can be noisy too.  I don't have
>> anything like that close to me, but there is one out on a busy street
>> a few blocks away.  You would recognize it if you have one.  They
>> take up  a lot of room on a pole.
>> 
>> Hope you can find it.
>> 
>> Dale, k9vuj
> 
> 
> 
> -- 
> 
> David Colburn, KD4E - Nevils, Georgia USA
> 
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