Re: [time-nuts] DAC performance

2017-07-17 Thread Richard (Rick) Karlquist
On 7/17/2017 1:41 PM, Attila Kinali wrote: On Mon, 17 Jul 2017 12:07:29 -0700 "Richard (Rick) Karlquist" wrote: On 7/17/2017 10:54 AM, Azelio Boriani wrote: This implies that in a Rb or Cs there is not a voltage reference source? Yes, that's right, there is no

Re: [time-nuts] DAC performance

2017-07-17 Thread Charles Steinmetz
Attila wrote: Charles Steinmetz wrote: how about the LTC1650? * * * [it] is nearly 100x (40dB) quieter (30nV/sqrtHz vs. 280) [than the 1650] I was about to ask the same question :-) Note: I divided 280 by 30 and got "nearly 100x". D'Oh! Of

Re: [time-nuts] unknown GPSDO

2017-07-17 Thread Richard Solomon
The July 1998 QST had an article on a GPSDO he designed. That may help. 73, Dick, W1KSZ Sent from Outlook From: time-nuts on behalf of Volker Esper Sent: Monday, July 17, 2017 2:47:42

[time-nuts] Quantic GPS receiver EFC control (was: Papers on timing for lunar laser ranging)

2017-07-17 Thread Attila Kinali
On Mon, 17 Jul 2017 10:24:42 -0700 Brooke Clarke wrote: > The Quantic Timing GPS receiver makes use of patent 5440313 > which results in a 48 bit DAC. How does this idea compare? > http://www.prc68.com/I/Q5200.shtml > https://www.google.com/patents/US5440313 > PS the above

[time-nuts] TAPR GPS Kit end plates

2017-07-17 Thread Steve - Home
A few weeks ago we wrapped up the end plate project. We had only 1 non-payer in the end, Tom Vojtek K1ADR, who hadn't responded to emails regarding payment so Tom's set and the extra sets of plates we ordered for engineering assessment were spoken for and I've had a few people ask about a

Re: [time-nuts] DAC performance [WAS: Papers on timing for lunar laser ranging]

2017-07-17 Thread Attila Kinali
On Sun, 16 Jul 2017 14:24:24 -0400 Charles Steinmetz wrote: > Well, to name just the first one that comes to mind, how about the > LTC1650? Like the 1655, it is available in SO and DIP packages. Its > differential nonlinearity is >2x better than the 1655, it settles

Re: [time-nuts] DAC performance

2017-07-17 Thread Attila Kinali
On Mon, 17 Jul 2017 12:07:29 -0700 "Richard (Rick) Karlquist" wrote: > On 7/17/2017 10:54 AM, Azelio Boriani wrote: > > This implies that in a Rb or Cs there is not a voltage reference source? > > > > Yes, that's right, there is no voltage reference with a material >

Re: [time-nuts] DAC performance [WAS: Papers on timing for lunar laser ranging]

2017-07-17 Thread Richard (Rick) Karlquist
On 7/17/2017 10:54 AM, Azelio Boriani wrote: This implies that in a Rb or Cs there is not a voltage reference source? Yes, that's right, there is no voltage reference with a material effect on stability or accuracy. Rick N6RK ___ time-nuts

Re: [time-nuts] DAC performance [WAS: Papers on timing for lunar laser ranging]

2017-07-17 Thread Azelio Boriani
This implies that in a Rb or Cs there is not a voltage reference source? On Mon, Jul 17, 2017 at 3:49 AM, Bob kb8tq wrote: > HI > > This is a limitation on an OCXO based GPSDO. That’s really the bottom line > here. > It’s a limitation in an OCXO based part, but not in one based

Re: [time-nuts] Papers on timing for lunar laser ranging

2017-07-17 Thread Brooke Clarke
Hi: The Quantic Timing GPS receiver makes use of patent 5440313which results in a 48 bit DAC. How does this idea compare? http://www.prc68.com/I/Q5200.shtml https://www.google.com/patents/US5440313 PS the above patent cites 4582434 i.e. the Heathkit GC1000 HFDO. -- Have Fun, Brooke Clarke