[TowerTalk] Broadcast Band Filter

[David Gilbert]

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 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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