Re: [time-nuts] The home time-lab

The minor down side is these resonant transformers acoustically hum and run hot. On the plus side they do clean up any kind of noise on the line. Rob, NC0B Sent from my iPad > On Jul 8, 2016, at 1:52 PM, Brooke Clarke wrote: > > > > Hi Bob: > > A resonate transformer

Re: [time-nuts] Quartz Crystal Motional Movement

Having dealt with crystal filter procurement for over 40 years, there are lots of mechanical issues as alluded to below. For crystals in the 5 to 10 MHz range, the edges have to be beveled so the blank is convex. Cleanliness is very important since it affects the plating of the electrodes. I

Re: [time-nuts] RG6 or LMR400 for GPS Antenna (Symmetricom 58532A and T-bolt)

I purchases NOS 3/8th inch hardline for my GPS antenna run. It had factory installed N connectors on it, so all I needed was an N to TNC adapter on the receiver end of my Trak GPSDO. Rob, NC0B. Sent from my iPad > On Apr 20, 2016, at 6:00 PM, "Bob Camp" wrote: > > > > Hi

Re: [time-nuts] Rpair of an 8662 HP Generator

With the improvement in the top radios today, it is no longer possible to test them with my 8662A / 8663A generators. I have had to move to 8642A / 8642B. However for more general sig gen needs, I prefer the 8662A. Rob NC0B -Original Message- From: time-nuts

Re: [time-nuts] Rpair of an 8662 HP Generator

If you 8662A has gone "bang" yet, replace the electrolytic on the three boards is a good starting place. Once it goes bang you will have a to start replacing solid-state devices. Rob, NC0B -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of KA2WEU---

Re: [time-nuts] Fast risetime pulse generator

Oops, sorry I didn't realize you needed 150 ps rise time. Rob Sent from my iPad > On Apr 12, 2016, at 6:02 PM, "jimlux" wrote: > > > >> On 4/12/16 1:30 PM, BIll Ezell wrote: >> (cross-posted to volt-nuts) >> After paying only limited attention to this topic, I suddenly

Re: [time-nuts] Fast risetime pulse generator

I have both HP and Tektronix pulse generators. Neither are expensive and both have been very reliable. Since I need some really slow rep rates for receiver testing, I use my Tek 115 triggered with an HP 8904A synthesizer. Rob, NC0B Sent from my iPad > On Apr 12, 2016, at 5:05 PM, "Logan

Re: [time-nuts] HP 53132A Display

N0QO fixed his display in one of his units. I have forwarded your email to him. If you forward me your direct e-mail address, I will pass it on. Rob NC0B -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Bert Kehren via time-nuts Sent: Friday, April

Re: [time-nuts] A new member & PN test set

Yes interested in what you are doing as to measuring phase noise. Rob, NC0B Sent from my iPad > On Mar 28, 2016, at 3:01 AM, "Oleg Skydan" wrote: > > > > Hi list, > > I am in a process of making a low noise frequency synthesizer for the 1st LO > for my new DSP HF

Re: [time-nuts] Reliability of atomic clocks

My Efratom M-100 has been running for about 15 years 24/7. I have no idea if that is typical. It was purchased as NOS for $300. Rob NC0B Sent from my iPad > On Mar 27, 2016, at 9:11 AM, "Bob Camp" wrote: > > > > Hi > > The “typical life” numbers on the tubes in the various

Re: [time-nuts] high rev isolation amps

ive directivity (dB) = isolation >(dB) - gain (dB) Rob NC0B Sent from my iPad > On Mar 26, 2016, at 6:00 PM, "Bruce Griffiths" <bruce.griffi...@xtra.co.nz> > wrote: > > > >> On Saturday, March 26, 2016 09:30:30 PM Rob Sherwood. wrote: >> You c

Re: [time-nuts] high rev isolation amps

Rob NC0B Sent from my iPad > On Mar 26, 2016, at 6:00 PM, "jimlux" <jim...@earthlink.net> wrote: > > > >> On 3/26/16 2:30 PM, Rob Sherwood. wrote: >> You cannot add the directivity and gain. Doesn't work that way. Rob, NC0B. >> > > Yeah, I

Re: [time-nuts] high rev isolation amps

I forgot to add, after the step attenuators at the output of the combiner, there is a 10 dB pad right at the back of the radio to provide a better return loss to the combiner. Rob, NC0B Sent from my iPad > On Mar 26, 2016, at 6:34 PM, "Rob Sherwood." <r...@nc0b.com> wrote:

Re: [time-nuts] high rev isolation amps

You cannot add the directivity and gain. Doesn't work that way. Rob, NC0B. Sent from my iPad > On Mar 26, 2016, at 2:00 PM, "jimlux" wrote: > > > > Consulting the time-nuts hive mind here.. > > I'm looking for off the shelf connectorized amplifiers with very good

Re: [time-nuts] Best Rubidium Frequency Standard

I have been running an M100 for over 15 years. It was NOS when I purchased it for $300. Runs 24x7, and just keeps chugging along. Rob NC0B Sent from my iPad > On Mar 11, 2016, at 10:01 AM, "time...@metachaos.net" > wrote: > > > > Luciano, > > Why? Why the Efratom

Re: [time-nuts] Inside a CTS 1960017 OCXO

ed at another similar type (as in small PCB configuration) and > powered (as in from your HP supply) oscillator for comparison? > > Not to beat the PS question to death, but does a battery supply change the > outcome? > > Tom Holmes, N8ZM > > -Original Message- >

Re: [time-nuts] Inside a CTS 1960017 OCXO

The part draws 600 mA during warm-up, and drops to around 230 to 200 mA when stabilized. Rob NC0B -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Bob Camp Sent: Saturday, February 27, 2016 2:26 PM To: Discussion of precise time and frequency

Re: [time-nuts] Inside a CTS 1960017 OCXO

I would have to make the measurement again with the HP supply off. I have measured my Rubidium and my GPSDO and never seen anything like this spectra of close-spaced spurious. I'll send you some more data direct. Rob NC0B -Original Message- From: time-nuts

Re: [time-nuts] Inside a CTS 1960017 OCXO

1960017 OCXO Rob: Are you sure you were running it with a clean power supply? Any 60 Hz ripple on the supply could show up as AM/PM modulation. You might want to try another 5V power supply before you give up on the oscillator. --- Graham On Sat, Feb 27, 2016 at 11:35 AM, Rob Sherwood. &l

Re: [time-nuts] Inside a CTS 1960017 OCXO

: [time-nuts] Inside a CTS 1960017 OCXO On 2/27/16 9:35 AM, Rob Sherwood. wrote: > Hi Dan, > > I purchased two of these, and VA7OJ one. One of mine is defective, and the > seller is going to replace it. What was disappointing was all the spurious > at 60 Hz intervals relatively clo

Re: [time-nuts] Inside a CTS 1960017 OCXO

Hi Dan, I purchased two of these, and VA7OJ one. One of mine is defective, and the seller is going to replace it. What was disappointing was all the spurious at 60 Hz intervals relatively close-in to the 10 MHz carrier. I suppose if all one wants is a reasonably accurate 10 MHz, then they

Re: [time-nuts] GPS Outage

When is some organization going to explain what happened in February for almost two hours starting at 00:16 GMT? That subject has gone silent. Rob, NC0B Sent from my iPad > On Feb 25, 2016, at 2:03 AM, "Michael Perrett" wrote: > > > > I think the following might be

Re: [time-nuts] Seeking HP 3561A schematic diagrams

Any 3561A will work. Rob NC0B -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Charles Steinmetz Sent: Friday, February 12, 2016 12:28 PM To: TimeNuts Subject: [time-nuts] Seeking HP 3561A schematic diagrams I'm helping a colleague resurrect a

Re: [time-nuts] New Member + Basic Questions

I did some interpolation to compare the specs for phase noise of the 8660 the way it was done then to the present method. I think it is going to be something like -105 dBc/Hz to -110 dBc/Hz at 10 kHz offset at 14 MHz carrier frequency. As a comparison, the 8662A is about -135 dBc/Hz and the

[time-nuts] Phase Noise Comparisons

I did some interpolation to compare the specs for phase noise of the 8660 the way it was done then to the present method. I think it is going to be something like -105 dBc/Hz to -110 dBc/Hz at 10 kHz offset at 14 MHz carrier frequency. As a comparison, the 8662A is about -135 dBc/Hz and the

Re: [time-nuts] Phase Noise Comparisons

Hi Dave, Very good. Interesting you data is better than any typical data I could find on the web which was -105 to -107 dBc/Hz at 10 kHz. I need N0QO to get his 3048A up and running again so we can test some other equipment. What are you using for software? At what frequency was this plot

Re: [time-nuts] Phase Noise Comparisons

Yes Rob NC0B -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of KA2WEU--- via time-nuts Sent: Saturday, January 16, 2016 6:01 PM To: time-nuts@febo.com Subject: Re: [time-nuts] Phase Noise Comparisons Did my plot make it ? Ulrich In a message

Re: [time-nuts] New Member + Basic Questions

has one of the lowest noise floors of any generator. > So I have several of them and then the synthesized gens like those > mentioned. > > Hear that sucking sound? > Its quicksand. > > Regards > Paul > WB8TSL > >> On Mon, Jan 11, 2016 at 3:54 PM, Rob Sherwood. <r...@nc0b.co

Re: [time-nuts] New Member + Basic Questions

rowaves, is not quite enough. > > > > Bob > KI2L > >> On Jan 11, 2016, at 09:47, Rob Sherwood. <r...@nc0b.com> wrote: >> >> The HP 8647A may be the worst signal generator HP ever made. The 8656B >> won't even go down low enough in level to make a noise

Re: [time-nuts] New Member + Basic Questions

cable thats shipped > with the units. > Mine were brand spanking new. NOS. > Good luck. > To Ron o yes no shed or anything but the gear builds up. Darn thing is > this stuff actually last longer then an iPhone99X due out tomorrow I am > sure. > Paul > WB8TSL > >> On

Re: [time-nuts] New Member + Basic Questions

or 8642A synthesizers working is not a piece of cake, so I would stay away from them unless you really need low phase noise generators. Good luck, and welcome to the hobby. I got my general in 1961, and it has been a wonderful experience. 73, Rob Sherwood, NC0B -Original Message

Re: [time-nuts] New Member + Basic Questions

Paul, Your last paragraph was a hoot. A ham friend of mine recently rented a storage shed to keep all his spare test equipment and parts units. Another ham friend used to have four storage units to store all his "stuff". The disease is not curable with either time or antibiotics. My XYL

Re: [time-nuts] Anybody who can record last Loran-C transmissions ?

The Perseus has a higher dynamic range than the Elad, if that matters. Rob, NC0B Sent from my iPad > On Dec 19, 2015, at 1:30 PM, "Jörg Logemann" wrote: > > > > I could make a raw capture with a 14bit Perseus or 16bit Elad FDM-S2 and > a good active receiving

Re: [time-nuts] RG 6 U couplings

I initially had 50 feet of RG-58/U going to my GPS antenna. The loss was likely around 12 dB. That cable eventually failed, and all I had was a 100 foot length of the same type of cable, and surprisingly the GPSDO still worked ok. Recently I purchased a 35 foot length of 3/8th inch hardline

Re: [time-nuts] KD2BD WWVB receiver/decoder in QEX

This circuit can cope with the phase modulated time data and still provide a frequency tracking signal for timebase adjustments? My Symmetrical WWVB receiver is useless now. I had to go to GPSDO to validate the operation of my two rubidiums. Rob, NC0B Sent from my iPad > On Nov 20, 2015,

Re: [time-nuts] modern electronics education/jobs (was:

A mentor of mine did airplane wiring during WW II. They initially used cable lacing that was likely similar to your Collins method. What they found was a machine gun bullet that penetrated the airframe caused more damage due to the laced cable bundles. At some point the changed to just laying

Re: [time-nuts] Downsizing dilemma, HP 3335A

The EE department at the University of Colorado has an enlightened professor. http://ecee.colorado.edu/faculty/popovic.html Zoya required her students to not only get a ham license, but to build a Norcal 40A. http://ecee.colorado.edu/~ecen2420/Files/NorCal40A_Manual.pdf Most of the EE

Re: [time-nuts] HP 3335A for the impoverished experimenter

The phase noise of the 3335A is typically much better than spec. Definitely way better than a 3336C and has one of the worlds best laser-trimmed attenuators. The 8642A and 8662A are better on phase noise, but much harder to keep working. Anyone wanting a great signal generator should jump at

Re: [time-nuts] NAVSTAR proteus GPS time and frequency unit

Why is this an issue? Sent from my iPad > On Nov 8, 2015, at 1:00 PM, "Brendan Giles" wrote: > > > > I was the project manager who was in charge of the NAVSTAR proteus GPS time > and frequency unit.The two GPS rollover dates 1999/2018 were tested in > product

Re: [time-nuts] NAVSTAR proteus GPS time and frequency unit

weeks. Seems easy right. Nope. > That works for the old austron. But as I say serious thinking. There are > some online tools that help. But it all gets old very fast. > Regards > Paul > WB8TSL > >> On Sun, Nov 8, 2015 at 4:01 PM, Rob Sherwood. <r...@nc0b.com> wrote: >

Re: [time-nuts] NAVSTAR proteus GPS time and frequency unit

For multiple reasons I install serial cards in my Win7 desktops. On the issue of the Win95 program, it may not run because the CPU is too fast. Rob NC0b Sent from my iPad > On Nov 4, 2015, at 7:02 PM, "paul swed" wrote: > > > > Steve > My very small 10 cents. > I am

Re: [time-nuts] Some results on a very interesting Sulzer OCXO

I had a 5 MHz Sulzer in my lab for 20+ years, later adding a 2.5 MHz version. Living in Denver made tracking WWVB very easy with three different comparators over the years. I never managed to run them without a power interruption for anything close to 4 years. I also obtained two with an