[TowerTalk] Broadcast Band Filter

[Joe Subich, W4TV]

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 at 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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