[time-nuts] Time Lord, video of

On Fri, Mar 4, 2016 at 10:41 AM, Tom Van Baak > wrote: > There was just a CNN link to this timely video of Judah Levine: > > Just Call Him the 'Time Lord' > https://www.youtube.com/watch?v=VkMR5q-R-sM sorry for double post. I added: The history of time and

Re: [time-nuts] high rev isolation amps

When I looked at the Wenzel amps, they were extremely low noise, but the isolation was nothing to write home about. On 03/26/2016 08:20 PM, John Miles wrote: I'm looking for off the shelf connectorized amplifiers with very good reverse isolation for doing things like intermod measurements

Re: [time-nuts] Owner's Manual and advice for Austron 2110 Disciplined Freque...

Bob: Thanks for the advice. When the unit was powered on for about three days (!) the "Not warmed up" message finally went away and it appears that the unit will now lock onto an external 1 MHz signal to within a few parts in 10E-10. This was confirmed with direct measurement using a

Re: [time-nuts] Glass Envelope Quartz Crystals

Hi > On Mar 26, 2016, at 2:49 PM, Alex Pummer wrote: > > I am perhaps to late now,I found the e-mail recently: > " >> sockets can be an issue. With wire leads, you are asking for trouble. >> >> Functionally, there is little there is little difference between a glass > >

Re: [time-nuts] high rev isolation amps

In light of this discussion, I'm taking a deep gulp to mention a project that's finished but has been on my back burner for a while. A few years ago I laid out a high isolation, low noise buffer amp based on one of Bruce's cascaded-transistor designs. Isolation was measured in excess of

Re: [time-nuts] HP 58501A reference clocks

Hi I wold not be at all surprised if it has a previous location surveyed into it’s little brain. As long as it still thinks it’s in Virginia (or wherever) it’s not going to lock up in it’s new home. Depending where it came from, it might be a lab unit for initial design checkout. If HP

Re: [time-nuts] high rev isolation amps

If you ask Mini-Circuits about the details of their amps that are specified as to having high reverse isolation, they have a pad in the circuit. I don't know whether it is in the input or the output. Maybe both, looking at a ZFL-2AD specs. >From a Mini-Circuits data sheet it says: active

Re: [time-nuts] high rev isolation amps

I use two ZHL-32A buffer amps, the appropriate Mini-Circuits LPFs, and 20 dB pads into a 4-way Mini-Circuits combiner. I believe it is ports 2&3 that have even better isolation than a 2-way combiner. These buffer amps run on 24 volts, where the ZFL-500LN doesn't have the output capability to

Re: [time-nuts] high rev isolation amps

I forgot to add, after the step attenuators at the output of the combiner, there is a 10 dB pad right at the back of the radio to provide a better return loss to the combiner. Rob, NC0B Sent from my iPad > On Mar 26, 2016, at 6:34 PM, "Rob Sherwood." wrote: > > I use two

Re: [time-nuts] high rev isolation amps

On 3/26/16 3:25 PM, Bruce Griffiths wrote: On Saturday, March 26, 2016 09:30:30 PM Rob Sherwood. wrote: You cannot add the directivity and gain. Doesn't work that way. Rob, NC0B. Sent from my iPad Minicircuits would disagree with that and its their amplifier. Bruce Well, it's a bit

Re: [time-nuts] high rev isolation amps

> I'm looking for off the shelf connectorized amplifiers with very good > reverse isolation for doing things like intermod measurements (e.g. 2 > signal generators followed by amps/pads into a combiner) and phase noise > measurements for a digital receiver. > > 1-100 MHz kind of frequency

Re: [time-nuts] high rev isolation amps

On 3/26/16 4:14 PM, Richard (Rick) Karlquist wrote: Nothing has come to my attention in the last 35 years that is superior for buffer amplifiers to the simple cascade of grounded base transistors as described by numerous NBS/NIST papers. The chain usually starts with a common emitter (with

Re: [time-nuts] Glass Envelope Quartz Crystals

I am perhaps to late now,I found the e-mail recently: " sockets can be an issue. With wire leads, you are asking for trouble. Functionally, there is little there is little difference between a glass package crystal and a metal package. About the only real one is the obvious - one has a

Re: [time-nuts] Owner's Manual and advice for Austron 2110 Disciplined Frequency Standard

Hi It’s probably bringing out both sides of the varicap to accomplish the same sort of thing. Bob > On Mar 26, 2016, at 5:22 PM, Hal Murray wrote: > >> The one I have has both EFC+ and EFC- pins. > > Is that a differential input so you don't have to worry about

Re: [time-nuts] Owner's Manual and advice for Austron 2110 Disciplined Frequency Standard

In message <20160326212201.46e79406...@ip-64-139-1-69.sjc.megapath.net>, Hal Mu rray writes: >> The one I have has both EFC+ and EFC- pins. > >Is that a differential input so you don't have to worry about ground offset >shift when the oven current changes? I have no idea... It's one I

[time-nuts] HP 58501A reference clocks

Hi group, I recently purchased an HP 58XXXA or 58501A precision reference clock unit. The unit is clearly a prototype made by HP for Ericsson GE. The front label actually says 58XXXA. The serial number of the unit is EGE001P. It has a GPS antenna in and 10 MHz, 19.2 MHz, 9600 kHz and a

Re: [time-nuts] high rev isolation amps

On Saturday, March 26, 2016 10:57:01 AM jimlux wrote: > Consulting the time-nuts hive mind here.. > > I'm looking for off the shelf connectorized amplifiers with very good > reverse isolation for doing things like intermod measurements (e.g. 2 > signal generators followed by amps/pads into a

Re: [time-nuts] high rev isolation amps

Nothing has come to my attention in the last 35 years that is superior for buffer amplifiers to the simple cascade of grounded base transistors as described by numerous NBS/NIST papers. The chain usually starts with a common emitter (with emitter degeneration resistor), which is an even older NBS

Re: [time-nuts] high rev isolation amps

On Saturday, March 26, 2016 09:30:30 PM Rob Sherwood. wrote: > You cannot add the directivity and gain. Doesn't work that way. Rob, NC0B. > > Sent from my iPad Minicircuits would disagree with that and its their amplifier. Bruce > > > On Mar 26, 2016, at 2:00 PM, "jimlux"

Re: [time-nuts] high rev isolation amps

On 3/26/16 2:30 PM, Rob Sherwood. wrote: You cannot add the directivity and gain. Doesn't work that way. Rob, NC0B. Yeah, I kind of figured that after getting the S parameters from minicircuits. Sent from my iPad On Mar 26, 2016, at 2:00 PM, "jimlux" wrote:

Re: [time-nuts] Owner's Manual and advice for Austron 2110 Disciplined Frequency Standard

> The one I have has both EFC+ and EFC- pins. Is that a differential input so you don't have to worry about ground offset shift when the oven current changes? -- These are my opinions. I hate spam. ___ time-nuts mailing list --

Re: [time-nuts] high rev isolation amps

You cannot add the directivity and gain. Doesn't work that way. Rob, NC0B. Sent from my iPad > On Mar 26, 2016, at 2:00 PM, "jimlux" wrote: > > > > Consulting the time-nuts hive mind here.. > > I'm looking for off the shelf connectorized amplifiers with very good

[time-nuts] high rev isolation amps

Consulting the time-nuts hive mind here.. I'm looking for off the shelf connectorized amplifiers with very good reverse isolation for doing things like intermod measurements (e.g. 2 signal generators followed by amps/pads into a combiner) and phase noise measurements for a digital receiver.

Re: [time-nuts] Owner's Manual and advice for Austron 2110 Disciplined Frequency Standard

In message <599355eb-013e-4730-b41f-dd8606b2e...@n1k.org>, Bob Camp writes: >The 1150 OCXO has an EFC pin on it. The one I have has both EFC+ and EFC- pins. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer

Re: [time-nuts] Owner's Manual and advice for Austron 2110 Disciplined Frequency Standard

Hi The 1150 OCXO has an EFC pin on it. The output *should* tune to both sides of 10 MHz. Since this is an old box, the OCXO may have aged far enough to keep that from happening. If the EFC is railed, it is a good bet you need to tune the OCXO with the mechanical trimmer that is behind the