1 GHz synthesizer
in [Design]
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From: Jim Thompson on 25 Feb 2010 14:22 On Thu, 25 Feb 2010 11:09:57 -0800 (PST), osr(a)uakron.edu wrote: >On Feb 25, 2:00�pm, o...(a)uakron.edu wrote: >> > � �You want real fun? �Try to align a 'Tubular Filter' without a network >> > analyzer. >> >> > -- >> > Greed is the root of all eBa >> >> That DOES NOT need to be the five hours it usually takes... >> >> On odd element microwave ones, short the Inner element. Adjust the >> outer ones for �SWR as desired, open up the inner one. >> >> Dishal's method.... The guy wrote a brilliant paper on it.. >> >> Steve > >Ah found it: > >Dishal, M., � Alignment and Adjustment of Synchronously Tuned Multiple- >Resonant- >Circuit Filters,� Elec. Commun., pp. 154-164, June, 1952. > > Also see Hayward, >� Introduction to Radio Frequency Design,� ARRL, 1994, pp95-101. > >Steve > Steve, Many of us have no access to either of those articles (I have only 1981 and 1999 ARRL Handbooks). Can you post, or provide a link where IEEE rears their ugly head ?:-) Thanks! ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
From: Joel Koltner on 25 Feb 2010 14:26 "Jim Thompson" <To-Email-Use-The-Envelope-Icon(a)My-Web-Site.com> wrote in message news:66jdo55n5q8lsbbn49h1vrhikrl20iot2o(a)4ax.com... > Can you post, or provide a link where IEEE rears their ugly head ?:-) I can scan in the snippet out of Hayward tonight if no one else already has a PDF of it...
From: Jim Thompson on 25 Feb 2010 14:27 On Thu, 25 Feb 2010 12:22:43 -0700, Jim Thompson <To-Email-Use-The-Envelope-Icon(a)My-Web-Site.com> wrote: >On Thu, 25 Feb 2010 11:09:57 -0800 (PST), osr(a)uakron.edu wrote: > >>On Feb 25, 2:00�pm, o...(a)uakron.edu wrote: >>> > � �You want real fun? �Try to align a 'Tubular Filter' without a network >>> > analyzer. >>> >>> > -- >>> > Greed is the root of all eBa >>> >>> That DOES NOT need to be the five hours it usually takes... >>> >>> On odd element microwave ones, short the Inner element. Adjust the >>> outer ones for �SWR as desired, open up the inner one. >>> >>> Dishal's method.... The guy wrote a brilliant paper on it.. >>> >>> Steve >> >>Ah found it: >> >>Dishal, M., � Alignment and Adjustment of Synchronously Tuned Multiple- >>Resonant- >>Circuit Filters,� Elec. Commun., pp. 154-164, June, 1952. >> >> Also see Hayward, >>� Introduction to Radio Frequency Design,� ARRL, 1994, pp95-101. >> >>Steve >> > >Steve, Many of us have no access to either of those articles (I have >only 1981 and 1999 ARRL Handbooks). > >Can you post, or provide a link where IEEE rears their ugly head ?:-) > >Thanks! > Googling on.... "Alignment and Adjustment of Synchronously Tuned Multiple-Resonant-Circuit Filters" -ieee -wipo -patent -portal Give two returns, one in some oriental script, the other just a reference :-( ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
From: Joel Koltner on 25 Feb 2010 14:31 "Jim Thompson" <To-Email-Use-The-Envelope-Icon(a)My-Web-Site.com> wrote in message news:gkjdo551mlj1b5t9auebvt5l18nfucubte(a)4ax.com... > Give two returns, one in some oriental script, the other just a > reference :-( This one will get you some of the flavor of the technique: http://www.johansontechnology.com/en/technical-notes/rf-capacitors-a-inductors/dishal-bandpass-filter-tuning-using-lasertrimr-chip-caps.html I've tried this at 70cm, and while it works, if you just have a bunch of, e.g., capacitor-coupled LC resonators on FR4, it still requires some hand-tweaking in that you're already getting to the point where there's a little bit of coupling through "opens" and a slightly noticeable little bit of impedance through "shorts." ---Joel
From: Jim Thompson on 25 Feb 2010 14:38
On Thu, 25 Feb 2010 11:31:50 -0800, "Joel Koltner" <zapwireDASHgroups(a)yahoo.com> wrote: >"Jim Thompson" <To-Email-Use-The-Envelope-Icon(a)My-Web-Site.com> wrote in >message news:gkjdo551mlj1b5t9auebvt5l18nfucubte(a)4ax.com... >> Give two returns, one in some oriental script, the other just a >> reference :-( > >This one will get you some of the flavor of the technique: >http://www.johansontechnology.com/en/technical-notes/rf-capacitors-a-inductors/dishal-bandpass-filter-tuning-using-lasertrimr-chip-caps.html > >I've tried this at 70cm, and while it works, if you just have a bunch of, >e.g., capacitor-coupled LC resonators on FR4, it still requires some >hand-tweaking in that you're already getting to the point where there's a >little bit of coupling through "opens" and a slightly noticeable little bit of >impedance through "shorts." > >---Joel Thanks, Joel! If no one comes forth with the actual paper in the next few days, could you scan the snippet out of Hayward? Thanks again! ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food. |