Re: [time-nuts] Cable length calibration

> Le 29 juin 2016 à 22:18, Poul-Henning Kamp a écrit : > > > In message <20160629192850.19c29406...@ip-64-139-1-69.sjc.megapath.net>, Hal > Mu > rray writes: > >>> At one point they were looking into making a GPS time receiver where the >>> cable length

[time-nuts] DMTD downmixer question

Hi there, I will receive my SR620 soon and want of course to use it as well for stability measurement using the DMTD method. I've read many things on how to design the downmixer. There will be a DDS or low noise generator as LO, the two mixers, and the squarer. There are apparently many

Re: [time-nuts] Cable length calibration

Hi > On Jul 1, 2016, at 3:40 AM, Mike Cook wrote: > > >> Le 29 juin 2016 à 22:18, Poul-Henning Kamp a écrit : >> >> >> In message <20160629192850.19c29406...@ip-64-139-1-69.sjc.megapath.net>, Hal >> Mu >> rray writes: >> At one point

Re: [time-nuts] 74HCT9046A Max. Operating Frequency

Bringing this thread back from death.. a Few days ago I decided to open a case with NXP to find the 9397 750 00078 Application Note. Not only they sent me a 76 pages app note, but also a program to help design with it. Any site were I can upload them so everybody can take a look? Daniel Em

Re: [time-nuts] Switching transistors, current sources, nonidealties and noise

Moin, Thanks everyone for the answers! On Mon, 20 Jun 2016 01:45:24 -0400 Charles Steinmetz wrote: > The transation frequency of the current source transistor is part of the > cause, but the primary cause is generally the capacitance of the CS > output node to ground.

Re: [time-nuts] DMTD downmixer question

The optimum sine to square converter is embodied in the Collins style limiter approach consisting of a cascade of limiting amplifiers each with suitable individual gain and individual bandwidth, the gain and bandwidth increasing for each successive stage until the output slew rate is sufficient

Re: [time-nuts] Cable length calibration

Hi Mike: For quite a while I was heavily into "chirp" transmissions. These are HF ionosphere radio transmissions that sweep from 2 to 30 MHz at 100 kHz/sec. In order to "tune" the radio to a specific station (you can not tune by frequency) you need to know the start time schedule for that

Re: [time-nuts] Cable length calibration

On 7/1/16 9:04 AM, Brooke Clarke wrote: Hi Mike: For quite a while I was heavily into "chirp" transmissions. These are HF ionosphere radio transmissions that sweep from 2 to 30 MHz at 100 kHz/sec. In order to "tune" the radio to a specific station (you can not tune by frequency) you need to

Re: [time-nuts] Switching transistors, current sources, nonidealties and noise

Hi > On Jul 1, 2016, at 7:56 AM, Attila Kinali wrote: > > Moin, > > Thanks everyone for the answers! > > On Mon, 20 Jun 2016 01:45:24 -0400 > Charles Steinmetz wrote: > >> The transation frequency of the current source transistor is part of the >>

Re: [time-nuts] Switching transistors, current sources, nonidealties and noise

kb...@n1k.org said: > There is also the somewhat non-intuitive need to stick a low value resistor > in the base. Done properly, they are very reproducible and reasonably > insensitive to load. Is that required for real circuits or just for the simulations? -- These are my opinions. I hate

Re: [time-nuts] Switching transistors, current sources, nonidealties and noise

There are a plethora of ways to build up a current source. The nice thing about spice is you can start with a generalized model to see which way you need to go. For a bipolar current source (sampling current at the emitter) you are going to achieve a maximum output resistance of beta*ro with an

Re: [time-nuts] Switching transistors, current sources, nonidealties and noise

Hi Works for both. Bob > On Jul 1, 2016, at 2:54 PM, Hal Murray wrote: > > > kb...@n1k.org said: >> There is also the somewhat non-intuitive need to stick a low value resistor >> in the base. Done properly, they are very reproducible and reasonably >> insensitive to