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

[Mike Feher]

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 

Mike B. Feher, N4FS
89 Arnold Blvd.
Howell, NJ, 07731
732-886-5960 

-----Original Message-----
From: Milsurplus [mailto:milsurplus-bounces at mailman.qth.net] On Behalf Of
David Stinson
Sent: Tuesday, February 16, 2016 9:36 AM
To: milsurplus at mailman.qth.net
Subject: Re: [Milsurplus] Receiver Filter Adaptor and Thoughts on Projects
In General

Taking all the good points into consideration and working on a "version 1.1"
of the filter adaptor for the TCS receiver.  The hard part is not the
circuit; it's figuring out where to put the parts on the board so it can be
wired most efficiently and with least feedback/leakage between the two
stages.  Will pass that along once I puzzle it out, Bill.  I'd be embarassed
for your readers to see photos of this cobbled-up "Version 0.9 Beta" of the
thing. ;-)

Also looking for alternatives.  Yes, I know- I feel a little like a
prostitute for even thinking of a "sand state" solution, but 
dang-it Mechanical filters can be expensive.   Saving money is a 
good cure for uneasy feelings ;-).
Come on "smart people:"  By now there ought to be some single-chip active
filter thingie that can do this without trying to build a mini-computer in
that space.

Some thoughts on these projects in general:

I do them for my own curiosity and satisfaction.  I write them up to share
the idea and hope some generous person smarter than me will suggest
improvements (and they almost always do, Lord bless them).  I also write
them in hopes someone else will build the thing and, together, we can make
it work even better.

There's an important reason I try to keep any solution very simple and
basic.  It's an iron, unbreakable law of ham radio tinkering.

****
The Law of Pernicious Parts Count:
For every additional part in a project beyond eight, the number of people
building the project will be halved.
****

IMHO, there's no point in writing-up some mini-computer DSP thing with 100
parts and needing a Masters in digital engineering to understand, just to
address the bandwidth issue in a boatanchor receiver;  no one is going to
build the thing or even read to the end of the piece once they see the
diagram.  No matter how great a solution it might be, it's a waste of
precious time and effort to write-up such a contraption.  If you want to
build one for your own satisfaction, that's great.  Go for it.  Just don't
expect anyone else in our community to build one.  Most of us are older now.
Our time, patience and resources are very limited. 
We aren't going to attempt a college course in digital engineering this late
in the game just to improve a vintage 
radio.   "If it ain't easy, it ain't happening."
Just one man's musings.  YMMV of course.

GL OM ES 73 DE Dave AB5S

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