Re: [time-nuts] low noise multiplication to 100 MHz

Jim, 3) Input and output level (?) the oscillator is a HCMOS output, so figure swinging about 3.5V Any multiplier configuration will produce lots of different harmonics, and will need fairly serious filtering after it if you want a clean 100MHz. If you have a 20MHz oscillator with

[time-nuts] Unified VCXO Carrier Board

On Oct 22, 2015, at 3:40 AM, Gerhard Hoffmann wrote: I'd like to design a unified VCXO Carrier Board to these requirements: 1. It can host one of the the following VCXOs: 1.1. HP 10811A-6111 (as from 5370A) 1.2 Morion MV89A 1.3 MTI 260 1.4 CV-950 1.5 Timetech 1.6 Axtal

Re: [time-nuts] fast switching quiet synthesizer

It might be worth looking at Holzworth. They make a range of single and multi channel synthesisers covering different levels of phase noise and switching speed. http://www.holzworth.com/ Regards, Garry Date: Tue, 07 Oct 2014 10:02:55 -0700 From: Jim Lux jim...@earthlink.net To: Discussion of

Re: [time-nuts] Is this DOCXO an SC or AT cut rock?

Scott, It doesn't look like AT-cut. AT-cut oven crystals are run at their upper turnover point, which is a minimum, so the frequency starts high from power up at normal room temperature. With SC-cut, the f/T curve is shifted to the right and they are operated at their lower turnover point (a

Re: [time-nuts] Looking for 1 GHz low phase noise amplifier

InGaP MMICs that are designed for voltage biasing. Noise from their internal bias circuitry seems to get on to the signal, and the NF started to increase well below compression. Mini-Circuits' GVA- series may well be similar, as they are also voltage-biased. Garry Thorp Date: Fri, 27 Sep 2013 10

Re: [time-nuts] Low noise power supplies?

if Cbyp is fitted (any value), but increasing the output capacitor to 100uF brings the peak down to ~30nV/rtHz. Garry Thorp ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts

[time-nuts] Best phase detector / mixer for 100MHz?

. As the normalised close-in phase noise of 100MHz OCXOs is considerably higher than that achieved by the best 5-10MHz oscillators, I don't believe the mixer's flicker noise should be significant. Garry Thorp I have been using an minicircuits mixer as a phase detector for measuring low frequency(5-10MHz

Re: [time-nuts] Frequency referenced temperature regulator

But since I happen to have access to much more stable frequencies than voltages, I thought of a different way: 1. Mount a X-tal-osc with really lousy tempco inside the enclosure 2. Compare its output to a stable reference frequency. 3. Use the output of the phase comparator to drive the

Re: [time-nuts] Advice on 10 MHz isolation/distribution / Phase Noise of 74AC gates (Bruce Griffiths)

Bruce wrote: A little more detail is required such as: 1) What was the divided down output of the 74AC163 compared with? The E5052B contains 2 uncorrelated test systems, and uses its 2 internal synthesisers (with separate 10MHz ref OCXOs) as references. The signal under test is split at the

Re: [time-nuts] Advice on 10 MHz isolation/distribution /Phase Noise of 74AC gates (John Miles)

Hello John, Your results look very interesting. The big variation with input level shows how important it is to get that right. Incidentally, I didn't blame the CMOS for the 1/f^3 slope, as that was 18dB below the OCXO's phase noise. The divider output dominated from ~100Hz outwards, and showed

Re: [time-nuts] Low noise voltage regulators

With the 723, you can make the reference noise as low as you want, by heavy RC filtering. This applies whether you use its own reference or a better external reference. The 723 also seems to work quite happily with a feedback capacitor from the output to the inverting input, reducing the AC gain

Re: [time-nuts] Advice on 10 MHz isolation/distribution (Bob Camp)

Hello Bob, My 15mA estimate for the output stage was based on AC coupling the output, which is how I connected it. The IC is then sourcing 25mA into 100R for half the time and sinking 25mA the rest of the time, so the mean supply current drawn is 12.5mA. The extra is to allow for the IC's

Re: [time-nuts] Advice on 10 MHz isolation/distribution

Hello Clay, Joining in this discussion at a rather late stage - have you considered using 74AC series gates as buffers? They provide reasonable isolation and have surprisingly low phase noise. A single 74AC04 inverter gives over 40dB reverse isolation at 10MHz, so 3 cascaded gates would give