[time-nuts] Re: Lowest noise (phase noise and ADEV) method to achieve 10 MHz signal from 5 MHz input

I see you are using two for the phase noise test setup (a common way of doing it). I am curious about the phase matching between units. From the results it appears they must be pretty well matched, but did not see any actual data. Since it is over a very narrow frequency BW it should be no

[time-nuts] Re: Potting compound advice needed

I too had the same experience Brooke. Back in the late 70's I built a TVRO station and saved up enough money for two GaAs FETs for an LNA. Used RTV to seal it. Sadly it died. Upon taking it apart to troubleshoot I found just about everything was green. 73 - Mike Mike B. Feher, N4FS 89 Arnold

[time-nuts] Re: time-nuts Digest, Vol 209, Issue 14

Back in the late 80's we were building a synthesizer with extremely strict phase noise characteristics at an output of 44 GHz. At the output of our ultra low noise Rubidium, we also added a 100 Hz BW crystal filter. At the time, even though Dave Allen was involved, our spec was such as the noise

[time-nuts] Re: thermodynamics of time keeping

I believe the macroscopic concept of entropy is applicable to almost every field of physics. - Mike Mike B. Feher, N4FS 89 Arnold Blvd. Howell NJ 07731 848-245-9115 -Original Message- From: Chuck / Judy Burch Sent: Sunday, September 5, 2021 2:40 PM To: time-nuts@lists.febo.com

[time-nuts] Re: Z3801A Temperature

Since I built an AC supply in my 3801, I replaced the solid top cover with a copper mesh due to the extra heat caused by the linear supply that I built inside it. It has been working fine for the last 18 years. Regards - Mike Mike B. Feher, N4FS 89 Arnold Blvd. Howell NJ 07731 848-245-9115

Re: [time-nuts] Old Crystal.

During WWII the Germans had crystals that glowed at resonance. Some place I have about a dozen of them on different frequencies. These were mainly used for calibration purposes, much like in our ARC-5 transmitters that utilized a crystal and a magic eye tube. About 55 years ago I had an old German

Re: [time-nuts] "Q for dummies"

I recall back in the late 60’s visiting some friends at BNL. One of them took me through the cryogenic lab. In one they had an LC running at near 0 and it could be heard in a receiver. We know for L, Q in its simplest form is Xl/R. At superconductor temperatures R approaches 0 and therefore Q

Re: [time-nuts] Leakage, tinySA

Sorry for the poor grammar on my post below. Mike B. Feher, N4FS 89 Arnold Blvd. Howell NJ 07731 848-245-9115 -Original Message- From: time-nuts On Behalf Of Mike Feher Sent: Saturday, January 16, 2021 11:10 AM To: 'Discussion of precise time and frequency measurement' Subject: Re

Re: [time-nuts] Leakage, tinySA

There is no birdies on mine that I can see, even as I decrease the RBW. - Mike Mike B. Feher, N4FS 89 Arnold Blvd. Howell NJ 07731 848-245-9115 -Original Message- From: time-nuts On Behalf Of Dana Whitlow Sent: Saturday, January 16, 2021 6:45 AM To: Discussion of precise time and

[time-nuts] La Crosse Clocks -

Are any of you aware of any La Crosse Ultra Atomic clocks with a 24 hour format? Hope all had a great Christmas. Regards - Mike Mike B. Feher, N4FS 89 Arnold Blvd. Howell NJ 07731 848-245-9115 ___ time-nuts mailing list -- time-nuts@lists.febo.com

Re: [time-nuts] Examples of traditional phase noise analyzers

Back in the late 80's we were making phase noise measurements by analog means at 44 GHz. Regards - Mike Mike B. Feher, N4FS 89 Arnold Blvd. Howell NJ 07731 848-245-9115 -Original Message- From: time-nuts On Behalf Of Attila Kinali Sent: Thursday, December 17, 2020 6:03 AM To:

Re: [time-nuts] Adding 10Mhz to HP105B and others

I loved those "Damn Fast" devices and still have some. Mike B. Feher, N4FS 89 Arnold Blvd. Howell NJ 07731 848-245-9115 -Original Message- From: time-nuts On Behalf Of cdel...@juno.com Sent: Sunday, November 15, 2020 12:01 PM To: time-nuts@lists.febo.com Subject: [time-nuts] Adding

Re: [time-nuts] power supply for Z3801

I built a 48 volt discrete linear supply into my Z3801 about 18 years ago. Still works fine. It was a tight squeeze but managed to fit it in behind the front panel. I replaced the plug on the back with a standard 3 pin socket assembly. I also replaced the top cover with fine coper screen to get

Re: [time-nuts] Looking for "The Theory and Design of Quartz Crystal Units" by V.Bottom

This did not make it the first time because I had attached photos that were too large. I have an original copy of Don Firth's publication on "Quartz crystal oscillator circuits design handbook". This was developed under a government contract by the US Army. Don was a friend while I was at

Re: [time-nuts] Aging 5065A ?

I do not believe that is true. Only a longer D/A would result in a closer approximation to the desired waveform. A longer accumulator will result in being able to use a finer update rate but taking a longer time to do it. I built my first DDS in 1971 and studied their spurious very thoroughly

Re: [time-nuts] Aging 5065A ?

It seems to me that now since the register so much longer, yet the D/A is the same, updates to the D/A will take longer and therefore creating more close in spurs. That 20logN does suck, but is real. I may suggest running the output of the DDS through a 5 MHz crystal, or better yet a very

Re: [time-nuts] Aging 5065A ?

. There are several DDS chips out there that will do this. Some of the more common ones ( = what you see on eBay) have issues …. Bob > On Oct 7, 2020, at 12:11 PM, Mike Feher wrote: > > Just curious Bob. What do you mean by higher resolution? Would that be > a longer accumulator a

Re: [time-nuts] Aging 5065A ?

Just curious Bob. What do you mean by higher resolution? Would that be a longer accumulator and more bits in the D/A? 73 - Mike Mike B. Feher, N4FS 89 Arnold Blvd. Howell NJ 07731 848-245-9115 -Original Message- From: time-nuts On Behalf Of Bob kb8tq Sent: Wednesday, October 7, 2020

Re: [time-nuts] More ES100 / WWVB BPSK chips

BPSK chips Mike, The BPSK format enhancement applies only to 60 kHz WWVB, not the short-wave WWV in CO or WWVH in HI. /tvb On 9/20/2020 3:48 AM, Mike Feher wrote: > Hi Tom - > > > > I wonder if WWVH is also sending in the new format for you guys on the > west coast,

Re: [time-nuts] More ES100 / WWVB BPSK chips

Hi Tom - I wonder if WWVH is also sending in the new format for you guys on the west coast, although you guys are closer to WWVB than I am, and the La Crosse just works great. Regards - Mike Mike B. Feher, N4FS 89 Arnold Blvd. Howell NJ 07731 848-245-9115 -Original

Re: [time-nuts] HP-10811AB-OCXO interface questions

I remember the days when we had to build our own discrete Schmitt trigger to do this. 73 - Mike Mike B. Feher, N4FS 89 Arnold Blvd. Howell NJ 07731 848-245-9115 -Original Message- From: time-nuts On Behalf Of Bruce Griffiths Sent: Wednesday, September 2, 2020 1:46 AM To: Discussion of

Re: [time-nuts] WWVB SDR discussion

cell    +1-304-790-9192 Jamaica cell:   +1-876-456-8898   -Original Message- From: time-nuts [mailto:time-nuts-boun...@lists.febo.com] On Behalf Of Mike Feher Sent: Thursday, August 20, 2020 11:00 PM To: 'Discussion of precise time and frequency measurement' Subject: Re: [time

Re: [time-nuts] WWVB SDR discussion

the only LF radio clock that uses the new eWWVB PM format. The smaller clocks and watches all use the legacy WWVB AM format. /tvb [1] https://www.lacrossetechnology.com/ [2] http://leapsecond.com/pages/ultratomic/ On 8/20/2020 8:00 PM, Mike Feher wrote: > Hi Don - > > I got two of them on eB

Re: [time-nuts] WWVB SDR discussion

- From: time-nuts On Behalf Of DON MURRAY via time-nuts Sent: Thursday, August 20, 2020 8:41 PM To: time-nuts@lists.febo.com Cc: DON MURRAY Subject: Re: [time-nuts] WWVB SDR discussion Mike... Which model did you order? 73 Don W4WJ On Thursday, August 20, 2020 Mike Feher wrote: I just purchased

Re: [time-nuts] WWVB SDR discussion

I just purchased 2 of those La Crosse 14" clocks and was totally amazed. I live on the Jersey shore on one acre surrounded by trees and about 8 miles from the ocean. After I placed batteries in the clock, it went through its initially routine which was neat in itself, and about an hour or less

Re: [time-nuts] Career opportunities at Jackson Labs

Hi Keith - Please say HI to Said for me and wish him all the best for the holidays .Let him know that I am enjoying my retirement. Thanks & Regards - Mike Mike B. Feher, N4FS 89 Arnold Blvd. Howell NJ 07731 848-245-9115 -Original Message- From: time-nuts On Behalf Of Keith Loiselle

Re: [time-nuts] hp 10544A and 10811A ovenized oscillators

Wow, I am surprised they allowed two weeks of playing around on an SSBN. I would have thought that on something like that the Navy would just replace it immediately. I was only in one once and I was real impressed by the professionalism of the crew. 73 - Mike Mike B. Feher, N4FS 89 Arnold

Re: [time-nuts] RF isolation amplifier question

Corby - >From the schematic it does not look like anything special but only a 50 ohm in and out circuit with fairly high isolation due to the common base of the second BFT66. You may be able to simply use a newer MMIC from one of the many sources to replace the assembly if you know the gain.

Re: [time-nuts] 10 MHz -> 16 MHz

Almost same answer as I gave Tom. Double to 20, divide by 10, and then mix the 2 with the original 10, You could also just divide by 5 and then mix that 2 with the original 10. Again, filtering required. 73 - Mike Mike B. Feher, N4FS 89 Arnold Blvd. Howell NJ 07731 848-245-9115

Re: [time-nuts] Programmable clock for BFO use....noise

Not when I built them in the late 60's and early 70's. All discrete. 73 - Mike Mike B. Feher, N4FS 89 Arnold Blvd. Howell NJ 07731 848-245-9115 -Original Message- From: time-nuts On Behalf Of Richard (Rick) Karlquist Sent: Friday, September 14, 2018 7:15 PM To: Discussion of

Re: [time-nuts] WWVB Chronverter update progress

Simple error. It is 1.667. 73 - Mike Mike B. Feher, N4FS 89 Arnold Blvd. Howell NJ 07731 848-245-9115 -Original Message- From: time-nuts On Behalf Of Bob kb8tq Sent: Sunday, August 26, 2018 6:34 PM To: Discussion of precise time and frequency measurement Subject: Re:

Re: [time-nuts] Affordable PoE 6-digit time displays?

Thank you both for the education. - Mike Mike B. Feher, N4FS 89 Arnold Blvd. Howell NJ 07731 848-245-9115 ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to https://lists.febo.com/cgi-bin/mailman/listinfo/time-nuts and

Re: [time-nuts] Affordable PoE 6-digit time displays?

Hi all - Sorry for an ignorant question from an old man, but what does PoE stand for? Thanks & Regards - Mike Mike B. Feher, N4FS 89 Arnold Blvd. Howell NJ 07731 848-245-9115 ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go