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.

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.

Conversely, go to the WB6BLD website and download the free student version
of Elsie and do it yourself, will take an hour to learn the software and 5
minutes to design the filter. Another good filter program that is free and
available and relatively easy to use is at the AADE website.

Would be worth your while to learn even if you seldom design a filter.

W4ZCB
"Peter O. Brackett" wrote in message
hlink.net...
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.

Conversely, go to the WB6BLD website and download the free student version
of Elsie and do it yourself, will take an hour to learn the software and 5
minutes to design the filter. Another good filter program that is free and
available and relatively easy to use is at the AADE website.

Would be worth your while to learn even if you seldom design a filter.

W4ZCB
"Peter O. Brackett" wrote in message
hlink.net...
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.

On Thu, 04 Mar 2004 23:43:21 +0000, Paul Burridge
wrote:

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 usual technique is to get a book that has tables of normalized LC
lowpass filters of various types, pick a response you like, and scale
it and map to a bandpass. Williams' "Electronic Filter Design
Handbook" has all this stuff.

It's mildly tedious, so I won't offer to do one for you.

John

On Thu, 04 Mar 2004 17:58:26 -0800, John Larkin wrote:

On Thu, 04 Mar 2004 23:43:21 +0000, Paul Burridge
wrote:

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).

wtf?

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 usual technique is to get a book that has tables of normalized LC
lowpass filters of various types, pick a response you like, and scale
it and map to a bandpass. Williams' "Electronic Filter Design
Handbook" has all this stuff.

It's mildly tedious, so I won't offer to do one for you.

John

He already has a book with a fair amount of tables and all the
explainations on how to go about the design. I'm wondering WTF
here. Hey paul. wtf?

--
Best Regards,
Mike

On Fri, 05 Mar 2004 11:28:51 GMT, Active8
wrote:

He already has a book with a fair amount of tables and all the
explainations on how to go about the design. I'm wondering WTF
here. Hey paul. wtf?

Fair point. I just wondered if anyone had a design similar to
requirements *already* lying around they might post it, that's all.
Save me a bit of scrawling and button-pushing. I didn't wish to put
anyone out.
Thanks to all who responded, BTW. Some very useful steers.
--

The BBC: Licensed at public expense to spread lies.

Hi Paul,
E-mail me directly and let me know how many poles you need. I
have the AADE program, and I will be glad to do that for you.

Pete

"Paul Burridge" wrote in message
...
On Fri, 05 Mar 2004 11:28:51 GMT, Active8
wrote:

He already has a book with a fair amount of tables and all the
explainations on how to go about the design. I'm wondering WTF
here. Hey paul. wtf?

Fair point. I just wondered if anyone had a design similar to
requirements *already* lying around they might post it, that's all.
Save me a bit of scrawling and button-pushing. I didn't wish to put
anyone out.
Thanks to all who responded, BTW. Some very useful steers.
--

The BBC: Licensed at public expense to spread lies.

On Fri, 05 Mar 2004 16:18:32 +0000, Paul Burridge wrote:

On Fri, 05 Mar 2004 11:28:51 GMT, Active8
wrote:

He already has a book with a fair amount of tables and all the
explainations on how to go about the design. I'm wondering WTF
here. Hey paul. wtf?

Fair point. I just wondered if anyone had a design similar to
requirements *already* lying around they might post it, that's all.
Save me a bit of scrawling and button-pushing. I didn't wish to put
anyone out.
Thanks to all who responded, BTW. Some very useful steers.

Yes. I had to check my disorganized drive to make sure I'd been to
all those links. BTDT. I like having tools like that around to
compare what they say with what I figgered out on paper.
--
Best Regards,
Mike

On Fri, 05 Mar 2004 23:40:43 GMT, Active8
wrote:

Yes. I had to check my disorganized drive to make sure I'd been to
all those links. BTDT. I like having tools like that around to
compare what they say with what I figgered out on paper.

Indeed. Legendary Reg's programs are always well worth a look at, of
course. I did try out his filter design one last night, just out of
curiosity. Looks pretty neat. I'll run some sims through it later to
see what sort of results it gives. Might post the results later if
time permits...

--

The BBC: Licensed at public expense to spread lies.