Re: [time-nuts] Jan-Derk's DDMTD

2019-09-01 Thread jimlux
On 9/1/19 10:10 AM, Bill Slade wrote: Hello, This is a topic that interest me greatly as well. Some of the work we have done uses a digital frequency tracking loop to generate frequency errors directly from sampled data using a sampling system and ethernet system of our own design. We opted

Re: [time-nuts] Jan-Derk's DDMTD

2019-09-01 Thread Jan-Derk Bakker
Correction: On Sun, Sep 1, 2019 at 8:24 PM Jan-Derk Bakker wrote: > Especially with the addition of the LPF the simulator is showing quite > literally unbelievably good performance (example: running the ZCD over > 1/40th of the sine for an input signal of 0dBm/-10dBFS gives single digit >

Re: [time-nuts] Jan-Derk's DDMTD

2019-09-01 Thread Jan-Derk Bakker
Dear Jim, Thank you for your feedback. The very short version: this design works 'on paper', but there are a few undocumented unknowns that I can only resolve by actually building and testing it. > > 1. The input bandwidth of the digitizer chip is 750 MHz (very > impressive), but what happens

Re: [time-nuts] Jan-Derk's DDMTD

2019-09-01 Thread Bill Slade
Hello, This is a topic that interest me greatly as well. Some of the work we have done uses a digital frequency tracking loop to generate frequency errors directly from sampled data using a sampling system and ethernet system of our own design. We opted for using a look-up table-based DDS in

[time-nuts] Jan-Derk's DDMTD

2019-09-01 Thread AC0XU (Jim)
Jan-Derk- Excellent and exciting work! Thanks for sharing with the newsgroup... I have a couple of questions: 1. The input bandwidth of the digitizer chip is 750 MHz (very impressive), but what happens to input noise that is aliased? When sampling at 10MHz (plus offset) everything above