[RFI] For Hams too close to a AM station

[AA5CT]

Or, build this model and save a few bucks! This high pass model 
yields 40 dB attenuation starting at 1700 kHz and gets better further
down in the band.

Article comparing performance with existing filters (at the time):

 https://www.qsl.net/wb5wpa/Filter/AM Brick-Wall 160 Meter Filter.pdf

Schematic and performance:

https://www.qsl.net/wb5wpa/Filter/DesignAMBrickWall_08.pdf


BTW, the RigExpert AA-55 Zoom will perform within 1 kHz of a strong 
AM carrier (like, measured 0 dBm or 1 mW on the antenna) from say a 
station at 1700 kHz and tuning the antenna for same. If the AA-55 is tuned 
to 1700 kHz exactly one sees a 'beat note' (bouncing RL value) on the meter.
They do not use a broadband detector in that analyzer.

de AA5CT Jim

-----------------------------------------------------------


On Tuesday, October 26, 2021, 2:20:00 PM CDT, Michael Germino <ad6aa at sbcglobal.net> wrote: 





ICE RADIO PRODUCTS makes a BCB filter if you are are too close to a properly operating broadcast station.

I helped a friend set up a 40, 80, 160 antenna and he was having problems with the SWR meters.  I figured it was the radio station a few miles down the road.  The filter cured the problem. 
Mike73, AD6AA 


Sent from AT&T Yahoo Mail on Android
_______________________________________________
RFI mailing list
RFI at contesting.com
http://lists.contesting.com/mailman/listinfo/rfi