EMRFD Message Archive 2941
Message Date From Subject 2941 2009-04-19 20:34:44 gt25psi2002 Hybrid (90 deg module type)'s Formula?
I'm a newbie interested in homebrew projects. I've come across a
roofing-filter circuit design completed with a diplexer and 90 deg type
hybrids (splitter and combiner) designed at 9 MHz.
Roofing Filter
part_3.pdf>
I've a few 5.5 MHz IF filters restored from Swan 500cx tranceivers.
Please advise me a formula of 90 deg type hybrid which will be suitable
for usage at 5.5 MHz.
Best regards,
Amin
[Non-text portions of this message have been removed]2942 2009-04-19 23:48:55 Jason Milldrum Re: Hybrid (90 deg module type)'s Formula?
If you have an ARRL membership, search the QST Archive for
"Twisted-Wire Quadrature Hybrid Directional Couplers" by Reed Fisher,
W2CQH. It was in the Jan. 78 QST.
Good luck,
Jason Milldrum, NT7S
=====
NT7S Blog - <http://www.nt7s.com/blog>2943 2009-04-20 02:03:09 Sam Morgan Re: Hybrid (90 deg module type)'s Formula?
>in case others had problems getting to the url, start here:
> Roofing Filter
>> part_3.pdf>
>
http://www.warc.org.uk/cdg2000/front_end/schematics/
--
GB & 73
KA5OAI
Sam Morgan2944 2009-04-20 04:40:12 gt25psi2002 Re: Hybrid (90 deg module type)'s Formula?
Thanks very much for your reply. I use your keywords search the internet
and found this website <http://www.seboldt.net/k0jd/phase_notes.html>
with formula.
It seems that there is only one value of L and C for each corresponding
frequency; whereas a diplexer is flexible with many combination of L and
C depending2946 2009-04-21 11:03:30 ha5rxz Re: Hybrid (90 deg module type)'s Formula?
HA5RXZ
2947 2009-04-21 17:57:37 gt25psi2002 Re: Hybrid (90 deg module type)'s Formula?
Thanks very much. That's the website I used to develop my "quadrature
hybrid" software.
[I found it yesterday].
Best regards,
Amin