Re: [time-nuts] WWV/H Doppler Shift

2018-11-27 Thread djl
Tom: Thanks! Rob: your toolchain (to borrow a phrase) produces great results. If I read the graphics right, you might be able to obtain some outstanding results from the HAARP Research Campaign 29 Nov - 03 Dec 2018. U of Alaska Fairbanks Geophysical research Institute. A thought from

[time-nuts] WWV/H Doppler Shift

2018-11-27 Thread Scud West
I’ve been monitoring the Doppler shift of WWV/H and CHU for a while now from my location 100 km / 60 mi NW of Seattle. The receiver is a QS1R, using an LTC2208 16 bit ADC, and the 125 MHz clock is provided by a Bodnar GPSDO. A Wellbrook ALA1530S+ loop antenna provides good coverage for the

Re: [time-nuts] Symmetricom TS2100 Faults and Forgetfulness

2018-11-27 Thread Gregory Beat via time-nuts
Chris - Did you update this TS-2100 with HEOL Design’s replacement GPS receiver? Several time-nuts participants (and some scientific organizations) performed this update/upgrade (including me), replacing the obsolete TrimbleACE III GPS receiver.

Re: [time-nuts] RF isolation requirements for multiple GPS receivers

2018-11-27 Thread tim...@timeok.it
Dana, As described in the following HP GPS splitter the isolation is > 40dB. https://www.febo.com/time-freq/gps/hp58516a/HP_58516A.pdf I use one of these 8-channel splitters. I had a bad experience using a passive splitter of the minicircuits in the 10MHz distribution in my lab.

Re: [time-nuts] RF isolation requirements for multiple GPS receivers

2018-11-27 Thread Mike Cook
Hi, I am using Mini-Circuits ZN4PD1-50+. They are about 30dB in the GPS frequency band. I hang 4 receivers each off three of these mixing Motorola, Ublox, Trimble and Navspark and never had an issue. Mike > Le 27 nov. 2018 à 14:44, Dana Whitlow a écrit : > > I want to run about 4

[time-nuts] SRS FS 740

2018-11-27 Thread ew via time-nuts
Has any one bought the SRS FS740                                                   Bert Kehren In a message dated 11/21/2018 11:11:18 AM Eastern Standard Time, thol...@woh.rr.com writes: Thanks Steve and Tom for helping me sort that out. Much appreciated. Tom Holmes, N8ZM -Original

[time-nuts] RF isolation requirements for multiple GPS receivers

2018-11-27 Thread Dana Whitlow
I want to run about 4 separate GPS units of disparate manufacture from a single antenna. My plan is to provide power for the antenna via a bias tee (power inserter) at the bottom end of the antenna's cable, then use an isolating splitter on the receiver side of the bias tee to split to the