Re: [time-nuts] HP5065A Step Recovery Diode, what part#?

Dan I missed the fact that you hacked a smt srd in. It was Eds post that caught my attention. That hack is worth sharing the details with time-nuts. I didn't even know you could get SRDs today. Regards Paul WB8TSL On Mon, Aug 27, 2018 at 8:03 PM, ed breya wrote: > I forgot to mention: > > If

Re: [time-nuts] WWVB Chronverter update progress

Appreciate the comments. But back to the problem at hand. Having a replacement for wwvb that drives cheapy wall clocks and icing on the cake allowing phase tracking clocks to decode the time. Fix the good clocks and the cheapies work. That said not wanting to get crazy here. I measured the

Re: [time-nuts] WWVB Chronverter update progress

Well tinkering around and have 20 X 13 MHz vectron TCXOs. I have to say impressive. Ran it from 73-100 degrees. Its starts 40 Hz low and only moves 5 Hz over the range. Just my luck no 12 MHz units. Though I do have a number of 9.6 Mhz vectron and div 160 gets 60 KHz. They are actually only VTOs

Re: [time-nuts] WWVB Chronverter update progress

Hi One of the “interesting” things about the phase modulation on WWVB is that it does not get converted to AM (and thus mess things up) in the front end filters of the typical watches and clocks. The filters also do not strip off the AM modulation sidebands of the signal. One would *guess*

Re: [time-nuts] WWVB Chronverter update progress

Tim, there is indeed a consumer clock that uses only the BPSK modulation on WWVB. It is an "ULTRATOMIC" clock by La Crosse and has available on Amazon for over a year now. I have two of these clocks. They are *vastly* more sensitive than the usual "atomic" AM clocks. My actual experience is

Re: [time-nuts] WWVB Chronverter update progress

Hi The temperature spec on a typical 60 KHz crystal is in the 100’s of ppm range. The temperature coefficient can hit multiple ppm / C at fairly rational temperatures. That all adds on top of the set tolerance of the crystal. Simply to keep it passing signal while the room changes temperature

Re: [time-nuts] WWVB Chronverter update progress

The consumer WWVB wall clocks use a single 60kHz crystal as a front end filter (not as an oscillator). Unloaded Q of a small tuning fork crystal is often 30,000 or so. (You can actually observe this order of magnitude when a 32kHz crystal used in an oscillator - remove power and the crystal

Re: [time-nuts] WWVB Chronverter update progress

Hi One Hertz out of a million Hertz is one part out of a million parts. One Hertz out of 100,000 Hertz is ten parts per million. One Hz out of 10KHz is 100 PPM. One Hertz out of 60,000 Hertz is 16.667 parts per million. If you are running into a device that swings it’s OCXO to lock to the

Re: [time-nuts] WWVB Chronverter update progress

OK you sort of lost me here. 16 PPM would be great I might find something that works without a power sucking oven. But Bob mentioned online calculators and there are PPM calculators. Mr Google seems to know all. That said the lock range of any of the professional receivers is tight. +/- .6 Hz.

[time-nuts] Bezos 10 000 year clock

  In the August NED New Equipment Digest NEWEQUIPMENT.com issue on page 30 and 31 is an infomercial on the 10K Clock, is covered with some nice pictures. Bert Kehren ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to

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: