Paul:

[snip]
I need a simple design for a BPF with a centre frequency of 17.2Mhz.,
corner frequencies one Meg or therabouts either side of that and a
reasonably good shape factor (nothing critical here). I don't mind
having to do a bit of tweaking of values myself if anyone has
something close to that they can post. Passive L/C combinations only,
please. (assume the usual 50R nominal Zs.)
[snip]

Such a design can be achieved with a vert simple formula and a pocket
calculator or slide rule. Why don't you just use Bennett's simple formula
for the maximally flat approximation all pole element values, or Takashi's
simple formulae for the equiripple approximation all pole element values?

Oh... perhaps you want elliptic [Cauer or Darlington] designs or perhaps a
completely general parameter design in that case ypu will need a computer
and will need to do some programming or buy some programming, or
better yet...

Hire a consultant... :-)

Hey, I've designed literally thousands of LC filters over decades in most
frequency ranges, for clients who have paid me well. I have access to very
sophisticated and comprehensive general parameter LC filter design
programs that I have written [In Fortran BTW] over lo these many years
and they are immediately at my disposal.

But... unfortunately for some... I never design filters for free!

I'll do it for you at my usual consulting rates.

My rates are reasonable. Just call or email me to discuss the terms and
conditions.

:-)

--
Peter
Professional Consultant - Signal Processing and Analog Electronics
Indialantic By-the-Sea, FL
peter dot brackett at "eye" triple "e" dot org.
USA area code three two one, number seven two three, nine two five five.


"Paul Burridge" wrote in message
...
Hi all,

I need a simple design for a BPF with a centre frequency of 17.2Mhz.,
corner frequencies one Meg or therabouts either side of that and a
reasonably good shape factor (nothing critical here). I don't mind
having to do a bit of tweaking of values myself if anyone has
something close to that they can post. Passive L/C combinations only,
please. (assume the usual 50R nominal Zs.)
Thanks,

p.
--

The BBC: Licensed at public expense to spread lies.