Re: [RFI] For Hams too close to a AM station

[D C _Mac_ Macdonald <k2gkk@hotmail.com>]

The first URL below goes nowhere.

73 - Mac, K2GKK/5
Since 30 Nov 1953
Oklahoma City, OK
USAF (Retired) 61-81
FAA (Retired) 94-10

________________________________
From: RFI <rfi-bounces+k2gkk=hotmail.com@contesting.com> on behalf of AA5CT via 
RFI <rfi@contesting.com>
Sent: Tuesday, October 26, 2021 16:49
To: rfi@contesting.com <rfi@contesting.com>; Michael Germino 
<ad6aa@sbcglobal.net>
Subject: Re: [RFI] For Hams too close to a AM station


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://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.qsl.net%2Fwb5wpa%2FFilter%2FAM&amp;data=04%7C01%7C%7Cab6f9c154406425818a308d998caa056%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637708818318922500%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&amp;sdata=XVVCbaQOz0YkDiLLvKh1cNyU%2Fvn3sXxaPIauUm1rC6E%3D&amp;reserved=0
 Brick-Wall 160 Meter Filter.pdf

Schematic and performance:

https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.qsl.net%2Fwb5wpa%2FFilter%2FDesignAMBrickWall_08.pdf&amp;data=04%7C01%7C%7Cab6f9c154406425818a308d998caa056%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637708818318922500%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&amp;sdata=kFvYE1Ln3PZbsrmsotA7nOkLiLMhHzB2RA8whY4wOJk%3D&amp;reserved=0


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@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
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