aphid1@comcast.net said: > My applications were broadband. If I remember correctly, aggressive > bandwidth limiting can cause phase shift problems due to temperature > changes unless one is careful in the design of the filter. Does anybody ovenize amplifiers and filters to avoid that problem? -- These are my opinions. I hate spam.

Hi If you have the money, almost anything can be (and has been) done. It’s rare to find a real world application where this kind of thing is considered cost effective. Fancy radar systems are about the only thing that comes to mind. Radar of this sort is always high cost / low volume. Bob > On Oct 24, 2017, at 2:10 PM, Hal Murray <hmurray@megapathdsl.net> wrote: > > > aphid1@comcast.net said: >> My applications were broadband. If I remember correctly, aggressive >> bandwidth limiting can cause phase shift problems due to temperature >> changes unless one is careful in the design of the filter. > > Does anybody ovenize amplifiers and filters to avoid that problem? > > > -- > These are my opinions. I hate spam. > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there.

My applications were broadband. If I remember correctly,  aggressive

On 10/24/2017 11:10 AM, Hal Murray wrote: > > aphid1@comcast.net said: >> My applications were broadband. If I remember correctly, aggressive >> bandwidth limiting can cause phase shift problems due to temperature >> changes unless one is careful in the design of the filter. > > Does anybody ovenize amplifiers and filters to avoid that problem? > This problem came up in the design of the 5071A. I elected to avoid narrowband filters by using some tricks described in my FCS paper of about 25 years ago. I didn't find it necessary to ovenize the output section. By contrast, the 5061 had numerous narrow band filters that were problematical. Rick N6RK

On 10/24/17 11:54 AM, Bob kb8tq wrote: > Hi > > If you have the money, almost anything can be (and has been) done. It’s rare to find a > real world application where this kind of thing is considered cost effective. Fancy > radar systems are about the only thing that comes to mind. Radar of > this sort is always high cost / low volume. > Deep Space Network stations or other applications (VLBI) where the measurement uncertainty is like ADEV = 1E-12 in 1000 seconds. There's a whole analysis of the temperature effects on the fiber optic distribution components, for instance - and they're buried 2 meters down. At "billions of dollars in 1960/1970" I think DSN fits in Bob's high cost/low volume bucket. > Bob > >> On Oct 24, 2017, at 2:10 PM, Hal Murray <hmurray@megapathdsl.net> wrote: >> >> >> aphid1@comcast.net said: >>> My applications were broadband. If I remember correctly, aggressive >>> bandwidth limiting can cause phase shift problems due to temperature >>> changes unless one is careful in the design of the filter. >> >> Does anybody ovenize amplifiers and filters to avoid that problem? >> >> >> -- >> These are my opinions. I hate spam. >> >> >> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. >

		Attila Kinali

On Tue, 24 Oct 2017 12:12:24 -0700 "Richard (Rick) Karlquist" <richard@karlquist.com> wrote: > This problem came up in the design of the 5071A. > I elected to avoid narrowband filters by using > some tricks described in my FCS paper of about > 25 years ago. I didn't find it necessary to ovenize > the output section. For those looking for the paper: http://www.karlquist.com/FCS92.pdf Attila Kinali -- It is upon moral qualities that a society is ultimately founded. All the prosperity and technological sophistication in the world is of no use without that foundation. -- Miss Matheson, The Diamond Age, Neil Stephenson