[Elecraft] KBPF3 usefulness or effectiveness?

[Guy Olinger K2AV]

If the AGC is being used, any difference would be seen in the S-meter,
not the AF output, unless you live in an extremely quiet location and
you're trying to copy 40m BC during the day.

My KBPF3 switches in at 7.385. If you turn the AF gains to minimum in
a quiet room, you will hear the relay kick in/out the KBPF3 as you
tune across the switch-in points. Mine switches before the ham band
filter adds any noticeable loss, as there is no sudden change in any
level.  Very smooth.

Were you having trouble hearing a station or just curious about the
way it operates?

73, Guy.

On Mon, Dec 28, 2009 at 3:56 AM, Stephen  Prior <sjp at sjprior.fsnet.co.uk> wrote:
> James
>
> I suspect that 7.5MHz is far too close to the existing 40m bandpass
> filtering for you to notice any difference between it and the KBPF3. I can't
> try it here as I only have the single receiver, but if you to look around
> 12MHz for example I expect you would detect a significant difference.
>
> 73 Stephen G4SJP
> K3 #980
>
>
> On 28/12/2009 02:19, "James Sarte" <k2qi.nyc at gmail.com> wrote:
>
>>
>> Hello Elecrafters,
>>
>> When I assembled my K3 I installed the KBPF3 module in the sub receiver
>> figuring that I'd use the sub for SWL.  However, I was thinking about moving
>> it back to the main receiver in order to take full advantage of the
>> synchronous AM detection feature.  What I noticed though was that I can't
>> really seem to tell if the KBPF3 makes a difference when listening to
>> out-of-band stations.
>>
>> For example, tuning around tonight I came across a strong SW station on 7505
>> KHz.  Logic tells me that the sub receiver's AF output should be
>> significantly clearer, perhaps louder, than that of the main receiver.
>> Going back and forth between them doesn't seem to show any differences in
>> perceived audio quality though.
>>
>> So, I'm curious now if there are any tests I can perform that would
>> demonstrate the effectiveness of the KBPF3 module.
>>
>> Thank you for your valued input.
>>
>> Vy 73 de James K2QI
>
>
>
>
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