Ahh ... you guys are all correct, and so is KK9A. I missed the part
where KK9A mentioned the mixing of TWO BC stations that summed to an 80m
frequency. My bad.
73,
Dave AB7E
On 3/27/2020 11:53 AM, Joe Subich, W4TV wrote:
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
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