Re: [time-nuts] New Member + Basic Questions

It is more of a counter-assisted drift stabilizer than a true phase lock as would happen if locking a 10811 to an external standard. Rob, NC0B Sent from my iPad > On Jan 11, 2016, at 1:00 PM, "bownes" wrote: > > > > > The 8640 will lock to an external 5Mhz reference.

Re: [time-nuts] New Member + Basic Questions

Robs correct on that front. Did not have time to respond till now. The 8640 is not some sort of synthesized gen. But it has one of the lowest noise floors of any generator. So I have several of them and then the synthesized gens like those mentioned. Hear that sucking sound? Its quicksand.

Re: [time-nuts] Tait reference

Thank you Nigel, I've also taken a gamble on one of these units and am keeping my fingers crossed that it has a Rb standard in it. The service manual is most interesting, it looks like I could use one of the two 'loops' to lock a different OCXO, with a little tinkering it could be a very

[time-nuts] Reference OCXO

What would a shock mounted 10.08 MHz OCXO be user for? Just another nonstandard reference? Thanks 73 Glenn --- Glenn LittleARRL Technical Specialist QCWA LM 28417 Amateur Callsign: WB4UIV

[time-nuts] Possible 5372A available .. my usual luck

I've been lucking for a 5372A with option 020 (fast memory i/o). Well two 5372A's showed up on the Eplace and one had option 020,the other didn't I bid and won. They shipped me the one wrong one. The seller has offered to have me ship it back but before I do, is anyone interested ? I paid just

Re: [time-nuts] Lady Heather Server On Raspberry Pi 2 Model B?

I answered my own question. :) ser2net works perfectly as a “server” for LH. I’m using a USB to serial adapter and the ser2net.conf line for it is 3200:raw:0:/dev/ttyUSB0:9600 8DATABITS NONE 1STOPBIT LOCAL And for LH, /ip=n.n.n.n:3200 works. > On Jan 11, 2016, at 9:30 AM, Nick Sayer via

Re: [time-nuts] Reference OCXO

Hi Often what *looks* like shock mounting is vibration isolation. Since things like phase noise are impacted by vibration, isolation can be a good idea. If you are doing an airborne radar, they are fairly common. Bob > On Jan 11, 2016, at 5:12 PM, Glenn Little WB4UIV >

Re: [time-nuts] Tait reference

Yes, i found that description and it put me off buying one. But there are also references on the web (including time-nuts archive) to surplus T801s with rubidium sources. Anyway, I took a punt and bought one. So I'll find out soon :). On Mon, Jan 11, 2016 at 11:18 AM, Charles Steinmetz

Re: [time-nuts] Tait reference

Tait is a major mobile comms manufacturer-head office is here in Christchurch, NZ-a couple of miles down the road from me. The T801 is/was often used in simulcast systems (which seem to be peculiar to the UK) to lock up several base station equipments to a common reference-which is usually a

Re: [time-nuts] Tait reference

Hello, Tait T800 is a series of mobile radio repeaters, so probably the T801 could be a unit intended for iso-frequency networks, in which there are several repeaters are distributed in a wide area operating all at the same frequencies with a very tight tolerance. BNCs and 13.8V power

Re: [time-nuts] Tait reference

http://download.wrx.sk/pdfs/tait/Networks/Quasi.pdf says: Quasi-Sync works by broadcasting simultaneously from several transmitters on the same frequency. The transmitters then operate as a single transmitter giving superior coverage. A Tait T801 Frequency Reference Module accurately maintains

Re: [time-nuts] New Member + Basic Questions

The HP 8647A may be the worst signal generator HP ever made. The 8656B won't even go down low enough in level to make a noise floor measurement on a modern transceiver. Sure you can add external attenuation, but you won't know about how much leakage is occurring. Otherwise why wouldn't HP

Re: [time-nuts] New Member + Basic Questions

Nathan, Here is the link for the REF0. Dan visits time-nuts every now and again. http://syncchannel.blogspot.com/2015/08/standalone-operation-of-lucent-ks-24361.html Essentially the arduino fakes out the REF0 to believe a GPS receiver is attached. Then any 1PPS will train the reference. I have

Re: [time-nuts] Tait reference

Its difficult to say unless you can contact an ex Tait dealer who maintained a Local authority or Utility scheme. A similar unit by Pye/Philips I have knowledge of, was the HS400. This contained a Toyocom 5MHz OCXO which was used to lock a crystal producing the required excitation for the

Re: [time-nuts] Tait reference

Are these the references with a rubidium oscillator ? They seem to have similar models with OCXOs etc. http://www.ebay.co.uk/itm/111862884745 Hi Adrian, The T801 first seems to have hit the UK surplus market around 2005/2006, I was told a batch of a couple of hundred, and units from that

Re: [time-nuts] Tait reference

Is it possible to tell by looking at the back of the unit to determine if an Rb is fitted? -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Stephen Tompsett Sent: 11 January 2016 14:13 To: Discussion of precise time and frequency measurement Subject:

Re: [time-nuts] Tait reference

The T801 units I have seen in the UK contained a rubidium 10MHz reference (FRS form factor) and a synthesizer that could produce several outputs of a nominal 12,8MHz, but which could be individually offset slightly to allow for precise offsetting of the transmitter frequencies by a few Hz for use

Re: [time-nuts] Lady Heather Server On Raspberry Pi 2 Model B?

If you stick to something like QT4, which is either python, or C++, it is rather easy. QT4 has everything set up for you already, and a compiler for the graphics screens. You create the basic screen in the designer, and tell it what you want it to do when a mouse hovers, clicks, drags, etc...

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

Hi Thanks to all the information here. I can put more items to my experiment list. Regads Li Ang, BI7LNQ 2016-01-11 11:28 GMT+08:00 Magnus Danielson : > Moin, > > On 01/10/2016 07:56 PM, Attila Kinali wrote: > >> On Sun, 10 Jan 2016 14:30:41 +0100 >> Magnus

Re: [time-nuts] Tait reference

Adrian wrote: Are these the references with a rubidium oscillator ? They seem to have similar models with OCXOs etc. Tait is a manufacturer of mobile communications gear in New Zealand. The T801 was part of a discontinued "quasi-synchronous communications system" -- a form of simulcasting

Re: [time-nuts] New Member + Basic Questions

I really appreciate all the help. I really like that Ref0 combination, I don't see any Ref1s available right now, but you are saying that any decent GPS+Arduino can substitute? Should I be looking in the archives for that, or is there a website? Minor clarification to my earlier post about the

Re: [time-nuts] Lady Heather Server On Raspberry Pi 2 Model B?

How about a simpler question. I see in the documentation that LH can use a network connection to remotely read. Can a server for that protocol be made for the RPi? That would be super awesome deluxe for me, and assuming it's just a serial-to-TCP protocol should be nearly trivial to write (heck,

Re: [time-nuts] New Member + Basic Questions

On 01/10/2016 01:25 PM, Nathan Johnson wrote: Pretty sure this is where I want to go. I'm looking at Item# 231803015799 on the usual auction site, and this seems to be everything I need? I also looked at item# 111514491254 Nathan, I have an NTBW50AA. It can be monitored and controlled by

Re: [time-nuts] Tait reference

Thank you Nigel, I've also taken a gamble on one of these units and am keeping my fingers crossed that it has a Rb standard in it. The service manual is most interesting, it looks like I could use one of the two 'loops' to lock a different OCXO, with a little tinkering it could be a very useful

[time-nuts] Lady Heather Server On Raspberry Pi 2 Model B?

Lady Heather predates QT by several years... actually back to 1985 when her mommy controlled Magellan GPS receivers. A version ran on HP95LX palmtops during the first Gulf War. The server option just uses the server program to connect the GPSDO serial port to the net. On the other end Lady

Re: [time-nuts] New Member + Basic Questions

The 8640 will lock to an external 5Mhz reference. That's what the BNC in the heatsink is for. At least that is where it is on mine. The trick is doing a good divide by two. However, that said, the 8640 tops out at ~1024MHz, which if you get interested in even the lower microwaves, is not