[time-nuts] locking oscillators - an increase in power and/or stability ?

This is certainly an interesting phenomenon. A couple of possible explanations come to mind. First, if the pair of Gunn sources are not really locked and are oscillating at two different frequencies, the resulting voltage envelope would peak at about double the voltage of either oscillator.

[time-nuts] locking oscillators - an increase in power and/or stability ?

The interesting discussions on this site provoked me to try the experiment with two, fairly identical, Gunn K-band oscillators operating at 24.125 GHz. Individual power outputs were +18.5 and +19.5 dBm or 0.071W and 0.089W, respectively. By adding E/H tuners between the oscillator and

[time-nuts] 1903 Railroad self-Winding / Self-setting Clock

The Western Union clocks used in broadcasting up through the middle 70's were designed to be corrected through one-second current pulses over a standard 60 mA teletype loop. The clocks were wired in series like the old series Christmas-tree bulbs. Internally, the clocks employed two 1-1/2 V

[time-nuts] Strange Carrier

Brook's suggestion to shut off your house power is an excellent one; however, your neighbors could be involved, too. A portable transistor radio tuned to the low end of the band where there is no station would make a good electrical noise detector -- assuming the mystery signal has harmonics,

[time-nuts] Are these PRS10's worth it ?

My experience has been similar to Vasco's. Of three defective PRS-10s acquired for about $100 or less each, one had a bad MiniCircuits 400 MHz VCO module and was an easy fix. Another had a rubidium bulb issue that I traced to the driving FET. I managed to replace the FET, but the

[time-nuts] Another Philipe Patek clock

Didn't the BBC surplus a number of similar units, along with the slaves a few years ago? Bruce, KG6OJI ___ 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] time-nuts Digest, Vol 127, Issue 26

Jurg, There is a tantalum capacitor on the lamp board. When it fails it can corrode the board. I have had this happen. You can likely replace the tantalum capacitor and repair the foil connections. An issue with the PRS-10 units is that the factory has implanted settings for the specific

[time-nuts] PRS-1- Rubidium

Jurg, I did not see your picture before responding earlier. Check the dipped tantalum on the right for a hole that spouted acid. The device on pillars is a preliminary heating resistor for the rubidium bulb. Be sure to measure its spacing from the bulb, if you are going to remove the

[time-nuts] Frequency Divider

David, I am surprised at the lack of interest in your divider boards. These are great units and a very useful addition to shop frequency standards. I fit my board into a former NTSC TV distribution amplifier housing and used the DA's already present to distribute 1, 10, and 100 MHz. A front

[time-nuts] DMTD - analog multiplier vs. diode mixer ?

I realize this would not measure frequency or phase difference; but has anyone used a lock-in amplifier to compare two 10 MHz signals -- for example to adjust a rubidium oscillator to agree with a GPS reference? Bruce, KG6OJI ___ time-nuts mailing

[time-nuts] WWVB: measuring local 60 KHz noise

I have found the proximity of my home computer has kept a bedroom projection clock from locking to WWVB. Apparently the noise radiation from the computer effectively jams the 60 kHz signal. By setting the clock out on a deck about 30 feet further away from the computer, the clock locks up

[time-nuts] WWVB: measuring local 60 KHz noise

I have found the proximity of my home computer has kept a bedroom projection clock from locking to WWVB. Apparently the noise radiation from the computer effectively jams the 60 kHz signal. By setting the clock out on a deck about 30 feet further away from the computer, the clock locks up

[time-nuts] Antennas for Symettricom 2500 Time Source

Has anyone stumbled across the 12V antennas for Symmetricom 2500 Time Source units. The basic 23 dB model was a Symmetricom 112-1-02, furnished as part of the 093-03110-11 kit. They also offered a 40 dB model, 112-8-02 with the 093-30110-12 kit and a 50 dB model, 112-8-03 as

[time-nuts] Phase-Matrix 598A Service Manual

The recent discussion of frequency counter testing prompts me to ask members of this list if anyone owns or has access to the service manual for the Phase-Matrix 598A frequency counter. I have been looking for a copy for several years and have asked on several other forums without success. I

[time-nuts] Symmetricom TimeSource 2500

Reading the recent discussion about GPS receivers for a Stratum 1 NTP server caused me to reflect on the Symmetricom TimeSource 2500 I have been using for years as a GPS-based frequency reference. I only turn this on for a couple of days when it is likely I will need it, but am not sure if

[time-nuts] Symmetricom TimeSource 2500

For clarification, from reading the Symmetricom manual, the TS-2500 was designed as a reliable Stratum 1, 10 MHz source for communications systems. In addition to GPS, the unit monitors the internal SRI PRS-10, and other 10 MHz frequency references that are presented to it. It tracks and