Towertalk
[Top] [All Lists]

Re: [TowerTalk] Broadcast Band Filter

To: towertalk@contesting.com
Subject: Re: [TowerTalk] Broadcast Band Filter
From: "Joe Subich, W4TV" <lists@subich.com>
Date: Fri, 27 Mar 2020 14:53:45 -0400
List-post: <mailto:towertalk@contesting.com>
On 2020-03-27 2:11 PM, David Gilbert wrote:
>
Assuming we're talking a band reject filter, if the filter is between
the source of the AM signal and the rig, even if the source is due to
rectification, the filter should still do its job.  Why would it
not?

If the rectification generates a harmonic or IMD product that falls
in the filter *passband* no filter will reject that spurious product.
The only time a filter will reduce/eliminate a harmonic/IMD product
is if the filter is located between the signal that *excites* the non-
linearity that creates the harmonic/IMD and the non-linearity itself.

73,

   ... Joe, W4TV


On 2020-03-27 2:11 PM, David Gilbert wrote:

I don't understand your comment.  A filter is a filter.  Assuming we're talking a band reject filter, if the filter is between the source of the AM signal and the rig, even if the source is due to rectification, the filter should still do its job.  Why would it not?

73,
Dave   AB7E




On 3/27/2020 5:43 AM, john@kk9a.com wrote:
Probably Array Solutions, DX Engineering and maybe VA6AM have broadcast filters however if there is rectification occurring they will likely not help. At my station in Chicagoland I could hear a mix of two AM broadcast stations on my 80m TX antenna which was quite annoying at times. I never tried a specialized filter because I did not feel that it was a RX overload issue.

John KK9A


Mike Ryan mryan001 wrote:


I remember someone recommending a brick wall AM broadcast band filter some
months back.  Was a little on the expensive side but.if it works. Anyone
recall that thread and the name and/or contact for the manufacturer or
dealer?  Thanks.   - Mike

_______________________________________________



_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk

_______________________________________________



_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________



_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
<Prev in Thread] Current Thread [Next in Thread>