Re: [time-nuts] Adafruit Ultimate GPS timing message arrival times

On Mon, Aug 1, 2016 at 9:48 AM, Bob Camp wrote: > > The serial string is fine for an "eyeball clock". It’s not so fine for a > GPSDO. > > That is a good way to say it. NMEA was designed for marine navigation. Driving ships and boats across an ocean.So the NMEA that my water

Re: [time-nuts] Effect of EFC noise on phase noise

Am 02.08.2016 um 22:24 schrieb Bruce Griffiths: Uually a zero is needed in the bias stabilisation loop to eliminate low frequency gain peaking. 2 Meg across the 3.3uF remove the peaking. Nevertheless the circuit still has problems with its time constants. Weird things happen if you let the

[time-nuts] FDA1050 distrubution amplifier

All, I have a Time & Frequency Solutions (Brandywine) FDA1050 distribution amplifier, the version with just one input. The board inside has actually a connector for a second input, and I would like to see if this input could be put into use. However, with no manual/schematics at hand (plus a

Re: [time-nuts] Effect of EFC noise on phase noise

On Tuesday, August 02, 2016 01:03:58 PM Gerhard Hoffmann wrote: > Am 02.08.2016 um 09:14 schrieb Bruce Griffiths: > > > ... and a screen dump for the LTspice challenged > > ;-) Gerhard Uually a zero is needed in the bias stabilisation loop to eliminate low frequency gain peaking. Bruce

Re: [time-nuts] Another arrival time histogram: SiRF III

Hal, On 08/01/2016 05:49 AM, Hal Murray wrote: It was setup to only send GPRMC sentences. http://users.megapathdsl.net/~hmurray/time-nuts/RMC-hist.png Here is what it looks like over time: http://users.megapathdsl.net/~hmurray/time-nuts/RMC-offset.png There are interesting glitches at 3

Re: [time-nuts] Effect of EFC noise on phase noise

Am 02.08.2016 um 09:14 schrieb Bruce Griffiths: ... and a screen dump for the LTspice challenged ;-) Gerhard ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the

Re: [time-nuts] Effect of EFC noise on phase noise

Gerhard wrote: The preamp will be classical. Some JFETs in parallel * * * Cascode with a Zetex bipolar (or whatever they are called now). * * * Without the cascode, the 1 MHz is not possible. It does not help that the feedback limits the voltage excursions on the drain. As you

Re: [time-nuts] Effect of EFC noise on phase noise

Gerhard, please send me the LTspice files,  so I can compare it with  some of my circuits. The Groner preamp uses feedback to adjust the dc input at the input (paralleled) FET gate(s) to adjust the dc output to zero.  It uses a small value input coupling capactor with a high value resistor to

Re: [time-nuts] Effect of EFC noise on phase noise

Ja Gerhard, bitte schicke mir den LTSpice file, Danke im Voraus und 73 KJ6UHN Alex On 8/1/2016 6:34 PM, Gerhard Hoffmann wrote: Am 02.08.2016 um 02:42 schrieb Bruce Griffiths: /"I'm working on a new amplifier based on IF3602 or BF862 FETs that can use 10u foil only."/ / / Similar to that