Re: [time-nuts] 10MHz to 25MHz

From: Charles Steinmetz Try this: Best regards, Charles = Not for the UK, it seems. Is it on YouTube? Could someone upload it somewhere? Thanks, David -- SatSignal Software -

Re: [time-nuts] 10MHz to 25MHz

Bob wrote: That gets me to a quick intro to the episode and a link to watch the whole thing. The watch the whole thing link sends me off to another episode entirely Huh. Worked fine for me, originally and just now. Charles ___ time-nuts mailing

Re: [time-nuts] 10MHz to 25MHz

On 1/21/17 11:52 AM, Charles Steinmetz wrote: jimlux wrote: I forgot to watch (actually, I knew it was today, but I thought it would be on this afternoon, not at 7AM).. (and, I'll get a call from management on Monday.. uh, Jim, about that interview) LOL Try this:

Re: [time-nuts] 10MHz to 25MHz

Dont know about this one but I know from some other venues that it can take a day or two for an episode that was aired this morning to actually show up the link may bew pointing to last weeks show still ...Try again on Monday or Tuesday Dave On 1/21/2017 5:00 PM, Bob Camp wrote: Hi

Re: [time-nuts] 10MHz to 25MHz

jimlux wrote: I forgot to watch (actually, I knew it was today, but I thought it would be on this afternoon, not at 7AM).. (and, I'll get a call from management on Monday.. uh, Jim, about that interview) LOL Try this:

Re: [time-nuts] 10MHz to 25MHz

Hi > On Jan 21, 2017, at 2:52 PM, Charles Steinmetz wrote: > > jimlux wrote: > >> I forgot to watch (actually, I knew it was today, but I thought >> it would be on this afternoon, not at 7AM).. >> >> (and, I'll get a call from management on Monday.. uh, Jim, about that

Re: [time-nuts] 10MHz to 25MHz

Hi So what we are all now scrambling to find a copy of is season 3, episode 62 originally aired 1/21/2017 of Innovation Nation. Bob > On Jan 21, 2017, at 2:09 PM, jimlux wrote: > > On 1/21/17 10:24 AM, steve heidmann via time-nuts wrote: >> WoW . I don't know if I'm

Re: [time-nuts] 10MHz to 25MHz

On 1/21/17 10:24 AM, steve heidmann via time-nuts wrote: WoW . I don't know if I'm the first nut to see this but it was probably our own Jim Lux I just saw on CBS's Innovation Nation It was.. I forgot to watch (actually, I knew it was today, but I thought it would be on this afternoon, not

Re: [time-nuts] 10MHz to 25MHz

WoW . I don't know if I'm the first nut to see this but it was probably our own Jim Lux I just saw on CBS's Innovation Nation On Sat, 1/21/17, jimlux <jim...@earthlink.net> wrote: Subject: Re: [time-nuts] 10MHz to 25MHz To: time-nuts@febo.com

Re: [time-nuts] 10MHz to 25MHz

Hi > On Jan 21, 2017, at 10:25 AM, jimlux wrote: > > On 1/20/17 7:10 PM, Bob Camp wrote: >> Hi >> >> There are several other materials that you can make crystal resonators out >> of that >> are piezo electric. Some of them can give you much higher Q. This comes with

Re: [time-nuts] 10MHz to 25MHz

On 1/20/17 7:10 PM, Bob Camp wrote: Hi There are several other materials that you can make crystal resonators out of that are piezo electric. Some of them can give you much higher Q. This comes with a whole raft of other issues. Langesite is one of the more common materials you see people

Re: [time-nuts] 10MHz to 25MHz

Hi There are several other materials that you can make crystal resonators out of that are piezo electric. Some of them can give you much higher Q. This comes with a whole raft of other issues. Langesite is one of the more common materials you see people playing with. It is common enough that

Re: [time-nuts] 10MHz to 25MHz

once upon the time there was an other crystal material -- NOT quartz ! -- the Russian came up with it, perhaps Bernd [Neubig] remembers on that, what happened to that story? that crystal could be run at higher drive level, therefore it would be possible to make some better oscillators 73

Re: [time-nuts] 10MHz to 25MHz

Hi If you think about it, current through the crystal is at least as important as “drive level”. They are related by the crystal resistance. As the overtone goes up, the resistance (in general) goes up. There are size constrained designs where other things get in the way of this. There are

Re: [time-nuts] 10MHz to 25MHz

On Thu, 19 Jan 2017 10:48:57 -0800, you wrote: >On 1/19/2017 5:40 AM, David wrote: > >> oscillator. In some applications I would also be concerned about the >> phase of a narrow bandpass filter changing with temperature. > >The 5061 has tuned bandpass filter multipliers which have exactly this

Re: [time-nuts] 10MHz to 25MHz

017 4:13 AM > To: time-nuts@febo.com > Subject: Re: [time-nuts] 10MHz to 25MHz > > Chris wrote: > >> I have always wondered why we build our "standard" with such a low >> frequency. Why not a 100MHz GPSDO? Why 10MHz > > Quartz crystals work better a

Re: [time-nuts] 10MHz to 25MHz

Is there any reason why you wouldn't be able to run the same drive level on say the fifth overtone versus the fundamental? I would guess at 100 MHz it may be 3rd or 5th, or are they fundamental? The comments one drivelevel are simply based on snr, larger signal with same noise, better snr On

Re: [time-nuts] 10MHz to 25MHz

> On Jan 19, 2017, at 3:03 PM, Scott Stobbe wrote: > > Wouldn't crystal drive level be one of the important specifications for far > out phase noise? > > On Thu, Jan 19, 2017 at 1:33 PM, Bob Camp wrote: > >> HI >> >> A lot of your evaluation of the

Re: [time-nuts] 10MHz to 25MHz

Hi > On Jan 19, 2017, at 3:03 PM, Scott Stobbe wrote: > > Wouldn't crystal drive level be one of the important specifications for far > out phase noise? It would, but you can get the same floor at 10 MHz as you can get at 100 MHz. Bob > > On Thu, Jan 19, 2017 at

Re: [time-nuts] 10MHz to 25MHz

Bob wrote: is a $250,000 OCXO that is 1 cubic meter in size appropriate for your application? The answer to that one is universally - NO Well, it'll be a lot cheaper when it shows up on ebay. The shipping might be a killer, though. ;-) Best regards, Charles

Re: [time-nuts] 10MHz to 25MHz

Wouldn't crystal drive level be one of the important specifications for far out phase noise? On Thu, Jan 19, 2017 at 1:33 PM, Bob Camp wrote: > HI > > A lot of your evaluation of the term “better” will depend on your intended > use. One of the limits on phase noise > is the

Re: [time-nuts] 10MHz to 25MHz

o: time-nuts@febo.com Subject: Re: [time-nuts] 10MHz to 25MHz Chris wrote: > I have always wondered why we build our "standard" with such a low > frequency. Why not a 100MHz GPSDO? Why 10MHz Quartz crystals work better at lower frequencies, predominantly because they have

Re: [time-nuts] 10MHz to 25MHz

HI A lot of your evaluation of the term “better” will depend on your intended use. One of the limits on phase noise is the thermal noise floor. Because of that, starting at a higher frequency will always give you an edge on broadband phase noise. ADEV / short term stability is linked to the Q

Re: [time-nuts] 10MHz to 25MHz

On 1/19/2017 5:40 AM, David wrote: oscillator. In some applications I would also be concerned about the phase of a narrow bandpass filter changing with temperature. The 5061 has tuned bandpass filter multipliers which have exactly this problem. A temperature ramp causes a phase ramp

Re: [time-nuts] 10MHz to 25MHz

Chris wrote: I have always wondered why we build our "standard" with such a low frequency. Why not a 100MHz GPSDO? Why 10MHz Quartz crystals work better at lower frequencies, predominantly because they have higher Q. 10MHz was chosen because it is low enough for excellent performance

Re: [time-nuts] 10MHz to 25MHz

On Wed, 18 Jan 2017 21:06:04 -0800, you wrote: >On 1/18/2017 6:34 PM, David wrote: > >> An alternative very simple design I might try is a variation of the >> active frequency multiplier where the 5th harmonic is filtered >> directly from the output of the digital divide by two stage. > >That's a

Re: [time-nuts] 10MHz to 25MHz

From: time-nuts <time-nuts-boun...@febo.com> on behalf of Bob Camp <kb...@n1k.org> Sent: Wednesday, January 18, 2017 6:08 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] 10MHz to 25MHz Hi What are you going to us

Re: [time-nuts] 10MHz to 25MHz

On 1/18/2017 6:34 PM, David wrote: An alternative very simple design I might try is a variation of the active frequency multiplier where the 5th harmonic is filtered directly from the output of the digital divide by two stage. That's a useful trick to reduce the filtering burden. Having

Re: [time-nuts] 10MHz to 25MHz

That is exactly what I have just done, using an HMC1031 to lock a good 100MHz OCXO to my GPSDO, using a very narrow filter bandwidth with decent 22uF ceramic caps in the loop filter. I’ve also made a second version using an XOR gate and an MC12080 prescaler and flipflops and fast comparators,

Re: [time-nuts] 10MHz to 25MHz

On Wed, Jan 18, 2017 at 5:40 PM, Loren Moline WA7SKT wrote: > Are you talking about locking the 50MHz VCXO to my 10 MH. Standard? I want > the 25MHz to be from my 10MHz OCXO which is my station standard which will > locked to GPS eventually. > The 25MHz WOULD be locked to

Re: [time-nuts] 10MHz to 25MHz

This document covers various methods but I agree with Rick about phase locking a separate crystal oscillator; harmonic frequency multiplication is more useful at higher frequencies where other methods are unavailable: http://www.qsl.net/va3iul/Frequency_Multipliers/Frequency_Multipliers.pdf An

Re: [time-nuts] 10MHz to 25MHz

Hi What are you going to use the 25 MHz for? Will it drive any sort of radio? If so, cleaning up the phase noise of the GPSDO is a *very* good idea. With a PLL, you can *subtract* noise. With a multiplier you can only *add* noise. The narrow bandwidth PLL combined with a low nose VCXO is your

Re: [time-nuts] 10MHz to 25MHz

Are you talking about locking the 50MHz VCXO to my 10 MH. Standard? I want the 25MHz to be from my 10MHz OCXO which is my station standard which will locked to GPS eventually. Loren WA7SKT On Wed, Jan 18, 2017 at 4:01 PM -0800, "Richard (Rick) Karlquist"

Re: [time-nuts] 10MHz to 25MHz

A better and easier way is to phase lock a crystal oscillator. I would use a 50 MHz VCXO and divide the output by 2 to get a 25 MHz square wave. Rick N6RK On 1/18/2017 10:28 AM, Loren Moline WA7SKT wrote: Hello, I am looking for a good X5 multiplier to use to generate a 25MHz signal from my

[time-nuts] 10MHz to 25MHz

Hello, I am looking for a good X5 multiplier to use to generate a 25MHz signal from my 10MHz OCXO. I want to divide by 2 and multiply by 5 with a bandpass filter in the output and then a 3.3 volt 25MHz signal out. Maybe someone has better ways? Loren Moline WA7SKT Member: Pacific