[AMRadio] FW: Homebrew receiver

[Brett Gazdzinski]

Don,
On their web page, there are charts of the bandwidth, of the 3.5, 5.5 and 8
kc
filters.
They also list the shape factors.


In operation, I don't doubt the filters exceed the published specs,
they seem to in my receiver. I could not expect any better performance
out of a filter.


You have an op amp on the input, 3 filters of slightly different frequencies
in parallel, like they sometimes do with crystals, and an op amp output.

As I tune through a carrier slowly, I can see each filter peak.

I called them and spoke to the owner, I think its all done
at his house or small shop, and he was very helpful and friendly.


Brett
N2DTS
>
>
> They show only "nominal"  bandwidths for the LFH-4S and
> LFH-6S filters.
> Does anyone know what the 6 dB bandwidth and shape factor is
> for these
> filters?
>
> To my way of thinking, one would be better off with a passive
> filter and all
> amplification after the filter, than with active filtering,
> or several
> stages of filtering with some amplification between each.
>
> Don K4KYV
>
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