Get a copy of Amidon's catalog which gives detailed suggestions for powdered
iron and ferrite materials, based on many years of experience.
www.amidoncorp.com

Bill W0IYH

"Jeff" wrote in message
...
Hi,
Im confused regarding the choice of iron powder toroid for a 7Mhz high
pass
filter. I need to use a small size (T68) toroid. For the freq range, some
reference texts say T68-2 is the one, others say T68-6" grade. I see
differing "best Q range" specs for the 6
grade.....2-30Mhz......10-50Mhz...etc.
Have similar need for 20Mhz LPF, but assume "6" is really the choice
there.
Any suggestions as to the relative differences and reasons to choose
between
grades 2 and 6 for the HPF in T68 size?
Thanks,
JEFF

Hello William,

Get a copy of Amidon's catalog which gives detailed suggestions for powdered
iron and ferrite materials, based on many years of experience.
www.amidoncorp.com


Absolutely. I literally wore one of those catalogs to the point where
you could see through several pages.

Then there are the ARRL Handbook and their Antenna Book. Both well worth
every penny.

Regards, Joerg

http://www.analogconsultants.com

Hello Joerg, nice to meet you for the first time.

Bill W0IYH

"Joerg" wrote in message
...
Hello William,

Get a copy of Amidon's catalog which gives detailed suggestions for
powdered iron and ferrite materials, based on many years of experience.
www.amidoncorp.com


Absolutely. I literally wore one of those catalogs to the point where you
could see through several pages.

Then there are the ARRL Handbook and their Antenna Book. Both well worth
every penny.

Regards, Joerg

http://www.analogconsultants.com

Hello Bill,

Hello Joerg, nice to meet you for the first time.


Likewise. You name sounds very familiar, IIRC from a book about design
of HF gear. Didn't you work at Collins in the good old days when they
had mechanical filters in their gear?

Regards, Joerg

http://www.analogconsultants.com

Yes. I started at Collins Radio engineering department in 1964 and retired
from Rockwell Collins in 1990. For more info search Google for my name and
my call sign. See QRZ.COM for W0IYH. See www.noblepub.com.

Bill W0IYH

"Joerg" wrote in message
t...
Hello Bill,

Hello Joerg, nice to meet you for the first time.


Likewise. You name sounds very familiar, IIRC from a book about design of
HF gear. Didn't you work at Collins in the good old days when they had
mechanical filters in their gear?

Regards, Joerg

http://www.analogconsultants.com

"William E. Sabin" wrote:

Yes. I started at Collins Radio engineering department in 1964 and retired
from Rockwell Collins in 1990. For more info search Google for my name and
my call sign. See QRZ.COM for W0IYH. See www.noblepub.com.

Bill W0IYH


Did you ever work on their microwave receiver designs?

--
?

Michael A. Terrell
Central Florida

Hello, Mike,

I had a little experience with some military L-band RF design (JTIDS), but
that is about all. I have also designed miniature lumped-element filters
for the 3 GHz region. But most of my work and also my ham radio experience
have been at HF. Also, I am mostly, but not entirely, an analog specialist,
which has put me somewhat into the Jurassic Age.

Bill W0IYH

"Michael A. Terrell" wrote in message
...
"William E. Sabin" wrote:

Yes. I started at Collins Radio engineering department in 1964 and
retired
from Rockwell Collins in 1990. For more info search Google for my name
and
my call sign. See QRZ.COM for W0IYH. See www.noblepub.com.

Bill W0IYH


Did you ever work on their microwave receiver designs?

--
?

Michael A. Terrell
Central Florida