[Milsurplus] Receiver Filter Adaptor and Thoughts on Projects In General

[Ian Wilson]

Using ceramic resonators to build ladder filters (just like using quartz
crystals to
build ladder filters) has been published several times. One hit here:

http://m1kta-qrp.blogspot.com/2012/08/455khz-filter-from-455khz-ceramic.html

has links to the Butler site. Unfortunately some of the links in the blog
are missing.

But I think this would be a cheap and satisfying way to build a reasonably
narrow-band
455kHz filter.

73, ian K3IMW



On Tue, Feb 16, 2016 at 7:47 AM, David Stinson <arc5 at ix.netcom.com> wrote:

>
> ----- Original Message ----- From: "Mike Feher" <n4fs at eozinc.com>
> Subject: RE: [Milsurplus] Receiver Filter Adaptor and Thoughts on Projects
> In General
>
>
> I agree 100% Dave. While I understand what it takes to do it digitally (I
>> built my first digital filter in 1970), I do not want to do it now, and,
>> it
>> would be no fun anyway. This is doing it the real and practical way,
>> especially for tube radios. You may however want to look into ceramic
>> resonators/ filters. 73 - Mike
>>
>
> I have indeed been looking into that, Mike.
> Looked at some of the ways those solutions have been implemented in
> modern, plastic toy radios.  Shouldn't be hard to adapt.  Can you suggest
> readily available resonators that might work for a CW filter?  I find lots
> of them for 5 and 2.5 KC FM receiver applications; their shape doesn't look
> very impressive and the ones on the market for ham rigs like Kenwood seem
> to cost as much as the mechanical filters.  Can you point me in a good
> direction?
> TNX Dave S.
>
>
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