[SGVLUG] Off-Topic: An RF Choke for AM Broadcast Band?

[Todd Beason via SGVLUG]

If the noise is coming in through power cords or other cabling then you need Mix 77 ferrites like these:

 
https://palomar-engineers.com/rfi-kits/am-broadcast-rfi-kits/

 
If it is RF interference coming in over the antenna then you will need to find the source and address it there.  Solar panels, grow lights, cheap power supplies, and anything that uses pulse width modulation for control can cause interference.

-----Original message-----
From: Chime Hart via SGVLUG
Sent: Friday, January 3 2020, 6:04 pm
To: San Gabriel Valley LUG
Subject: [SGVLUG] Off-Topic: An RF Choke for AM Broadcast Band?
 
I realize this is rather off topic, however, with an amount of 
Hams-and-engineers we have on this list, I want to explain exactly what I am 
looking for.
Around 4years ago the AM reception in this section of our condo complex became 
rather noisy, however, walking around 90degrees on the balcony, the noise is 
gone, but its not like I can hang a wire out there. HOA would have a fit. So I 
remember there were rf chokes you could put between the antenna 
terminals-and-the radio--and-it would filter out noise. In checking with HRO, 
they didn't have anything other than for short-wave. Because of this noise, its 
hard to receive AM HD signals consistantly. Other than an informative 

discussion, if folks didn't want to clutter up the list, you can write directly. 
Thanks so much in advance. Board members here will not trouble shoot the noise, 
even if its servalance equipment in an ellavator.
I suppose a spectrim analizer would find the noise, but I certainly don't own 
one.
Thanks so much in advance for any guidance
Chime
Sherman Oaks



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