If the mixing product is internal to the rig, the filter will help.
What John is talking about is rectification/mixing occurring outside
somewhere (rusted metal contact, something weird but not infrequent) so
that the antenna is picking up an 80m signal. You hear the something,
but in this case the interference is "in band" and thus the filter won't
help at all.
The easy way to check the location (in the rig or external) is to dial
in some attenuation. If the interference product drops faster than the
amount of attenuation (e.g. 6 db of attenuation results in the
interference dropping by around 20 db), then it's a problem inside the
rig (overload) and the filter will help. If the interference drops by
the same amount as the attenuation, then it's outside the rig somewhere
and the hunt for that as well as mitigation is a project...
73/jeff/ac0c
alpha-charlie-zero-charlie
www.ac0c.com
On 3/27/20 1:11 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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