Re: [time-nuts] minimalist sine to square

An npn emitter follower with collector connected to the 10V supply will produce a 4.2V swing in a 50 ohm load. However it only works well if reflections from the load are small. Otherwise, assuming that you want a 0-5V signal at the 50 ohm load its possible to build a back matched driver

Re: [time-nuts] CSAC purchase

On 1/20/18 5:05 PM, Ronald Held wrote: I am thinking of buying a CSAC plus evaluation board. Eventually I might want to make it portable. Any suggestions including where to buy it? MicroSemi is the manufacturer - Find a distributor and order it. For instance, Digikey has the CSAC ($5312.50)

[time-nuts] CSAC purchase

I am thinking of buying a CSAC plus evaluation board. Eventually I might want to make it portable. Any suggestions including where to buy it? Ronald ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

[time-nuts] minimalist sine to square

If you have a TADD2-mini you can just replace the divider chip with the 10 KHz version. That doesn't get you a 10 V output, though. -- > I am trying to duplicate one channel of the TADD2 so I can bring 10Mhz down > to 10Khz. ___

[time-nuts] Time interval measurement vs dual mixer method

Luciano, I don't know of a commercial version. As you have seen as the two signals move away from close phase coincidence the system noise level will increase. This is because the common offset oscillator noise will only cancel when the phases are closely matching. This is mainly important

Re: [time-nuts] minimalist sine to square

Tom might have started this as I was playing around with PICDIV and had asked him the best conditioning circuit. Turned out I had all the parts to copy the TADD-2 including the mini circuits transformer so that’s what I did. It works well, pretty sensitive, etc. I’ve also used the bias trick

Re: [time-nuts] minimalist sine to square

In message , jimlux writes: >> I played with that, I used a small transformer to balance the signal >> and then into LVDS receiver through a voltage divider. Worked well, >> but I didn't measure the jitter, it was just for a

Re: [time-nuts] trimble Thunderbolt, how to get 25 or 27 mHz from it??

I am using Leo Bodnar's GPSDO that is based on the 5328 and what looks to be a good TCXO as an external reference clock for a Perseus SDR. Using that, I measured phase noise and Allan Deviation of the best sources I have available and found the phase noise and Allan Deviation to be close to what

Re: [time-nuts] trimble Thunderbolt, how to get 25 or 27 mHz from it??

Hi Mark -- Thanks! To clarify, when you say you've found "it" acceptable, you're referring to the 5328? What caught my eye about the 5351 was the three (or eight) outputs. My idea was to build a board that would provide independent LO oscillators for multiple VHF/UHF transverters. It

Re: [time-nuts] Time interval measurement vs dual mixer method

Hi The quality of the offset signal source matters in a DMTD system. If you are using a “noisy” source you will have trouble with the data. You also will have trouble if the offset signal is correlated in some way to one of the DUT signals. Bob > On Jan 20, 2018, at 3:43 AM, tim...@timeok.it

Re: [time-nuts] Time interval measurement vs dual mixer method

Hi Corby, I did several tests to verify the system noise floor using the same source for both input channels. I have seen that the result varies a lot as the difference in time between the two channels varies. Moreover, if I do two successive tests without changing the parameters and