[time-nuts] Noise and non-linear behaviour of ferrite

Attila, From my (past) CATV experience, ferrite-based devices don't introduce noise as such but they can certainly pick up noise (or transmit) unless they are toroidal or otherwise well screened. However, they can introduce distortion if the winding flux density approaches the ferrite's

[time-nuts] Is it Hz or MHz ?

Team Nutters, GPSDO's are often specified for stability as so many parts per x. Using a Symmetricom 8040C as an example, this has a quoted accuracy of typically 5E^-11 at shipment. Ageing (monthly and yearly) and ADEV stability rates for 1, 10 100 seconds are also given. This particular

Re: [time-nuts] time-nuts Digest, Vol 102, Issue 80

Mark, Phase stable cables won't win you much benefit. You can't go past quad shielded RG-6 for bangs-per-buck. It's available almost everywhere, cheap and pretty low loss as 0.25 cables go. LMR-400 (etc) is a good alternative. Kit VK1LL *** Re my contemplated cable choice, my interest in

Re: [time-nuts] time-nuts TIC

Hi Guys, Count me in also please ! Kit VK1LL / VK2LL * As Bert mentioned once the amount if interest is established purchase details will post. We also will post a FAQ for this project. Thanks, Corby The New

[time-nuts] Clocking a PIC16F628A from a Rubidium Standard

Stephen, As well as limiting the input voltage swing into the PIC with a ~2k2 resistor, add an additional 4k7 or 10k resistor (AOT) across the PIC's Vcc rail to ground. This swamps the rectified DC produced by the input drive signal when the PIC DC supply is removed. I've used /tvb's PIC

[time-nuts] WG mounting h/w (3)

two screws too tight at first to aviod warping the flange.?In aircraft installations I've designed have used shoulder screws because they were specified by the equipment manufacturer. ? Robert G8RPI. --- On Mon, 20/9/10, Kit Scally ksca...@bytecan.com.au wrote: From: Kit Scally ksca

[time-nuts] WG mounting h/w (2)

Hi, Well, still not strictly, strictly true ! In Ku K band earth stations I've worked in, I've never seen shoulder screws used, although the equipment used was mainnly from the USA. Next to you precision adaptors, SMA torque wrenches etc in your personal goodie box are sets of tapered

[time-nuts] Samsung GCRU-D's available

Hi, I thought you may be interested in some Samsung GCRU-D's I have on the *Bay, closing this weekend. Let me know off-line in interested. Item number: 290470537113 http://cgi.ebay.com.au/ws/eBayISAPI.dll?ViewItemitem=290470537113ssPa geName=STRK:MESELX:IT Thanks for the BW, Kit VK2LL

[time-nuts] Maser manual (2)

John, I'd put money on one of the feedthrough caps (easily damaged upon installation) in the Maser for such small jumps. From memory, the 5065A uses SM components, but these could be guilty. I've learned many abstract things I'd never otherwise come across in this thread on home-built

[time-nuts] Test - RYRYRY

Test only RYRYRYRYRY Suspect outgoing mails to the group being blocked. Apols for wasting BW. Kit ___ 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 instructions

[time-nuts] [OT] degausing

Craig, If memory serves me correctly, Philips better quality PAL colour TV's in the late 70's to early 80's inverted the CRT for us in the Southern Hemisphere. The TV's were clearly marked as such on the packing box. For reasons unknown, Japanese-made colour TV's never seemed to have this

[time-nuts] Divider pecking order ?

Group, If Dave P's current divider design has design jitter specs approaching SOTA vvs cost levels whilst the TAPR board is (perhaps) slightly inferior in performance, where does that leave Tom's venerable 1pps PIC divider in the pecking order ? Will all designs be subjected to a back-to-back

[time-nuts] IL graph

Didier, This wasn't the exact version I had in mind, but it contains essentially the same information. Thanks for the link. Kit *** This link will show you the effect of duty cycle on harmonic content: http://www.ko4bb.com/Test_Equipment/Pulse_Modulation/ Didier KO4BB

[time-nuts] IL waveforms

Joop, Indeed ! During lab evaluation, a sine wave locking source required much greater power (15-20dB IIRC) to achieve lock. Further, lock limits were almost impossible to discern with any degree of confidence. With a square wave, there were distinctive step jumps when approaching lock

[time-nuts] Injection locking

Hi, As others have already noted, there's a paucity of circuits or down to earth advice on this topic - unless your poison is millimetre wave technology. I set out to GPS-lock my Icom 706 transceiver some while ago. This uses a (single) hi-stability master 30MHz xtal oscillator. With support

[time-nuts] E1938A - U105

Dick, I have a couple of dead E1938A's. Your more than welcome to a 'pulled' U105 if that's any help. Postage to the States would be reasonable. Kit VK2LL Sydney *** The E1938A I have has an empty socket for U105. Does anyone know what it was used for ? It is a 16C74 8 Bit

[time-nuts] Alternate frequency sources : DVB-T and ISDN OT comment

Guys, Don't get confused with (a) recovering the transmitter's carrier frequency and (b) recovering the colour burst and/or data stream in a DVB-T signal for use as a house frequency standard. They're not one of the same ! Most TV carrier frequencies here in Sydney, Aust (analogue digital -

[time-nuts] OT - Tag Heuer watch pix

Disclaimer - viewing these images may damage you (hip) pocket. *** Slightly off-topic but I know there's some keen horologists amongst us. Enjoy ! http://www.smh.com.au/photogallery/executive-style/luxury/tag-heuer-rei nvents-watch-technology/20091021-h8pw.html Kit VK2LL

Re: [time-nuts] PDF creator

All, Or Primo-PDF. It's ad-free, glitch-free and has the ability to alter the PDF's security settings (ie: make the finshed pdf non-printable). As usual, no connections - just a happy camper ! http://www.primopdf.com/ (Note - 7.4Mb file.) Kit VK2LL Ray. Or CutePDF Writer No add's, no

Re: [time-nuts] Down under Time Nuts

Hi Ray, I'm one of the Sydney 'crowd' whilst Jim P is in Tassy. Murray is already identified himself from Auckland. One disadvantage (?) of being down-under and a TimeNut is reading about the great variety of toys available at mostly sensible prices to CONUS users. The packing and freight

Re: [time-nuts] Broken Ovenaire OSC 85-50 - crystal failure ?

G'day Joe, My call on this question is: very seldom with a properly designed circuit and crystal (NO flames please on these descriptions !) Having said that, I have a couple of broken crystals from once-working HP E1938A oscillators. All appear to have some form of physical fracture or

Re: [time-nuts] Broken Ovenaire OSC 85-50 - crystal failure ?

itself so it may be instructive to take a peak inside. However don't the E1938 cans have an internal vacuum? Some care in opening may be required. Bruce Kit Scally wrote: G'day Joe, My call on this question is: very seldom with a properly designed circuit and crystal (NO flames please

Re: [time-nuts] time-nuts Digest, Vol 56, Issue 71

Bill, What's wrong with Tom's (/tvb) PIC divider ? http://www.leapsecond.com/tools/PPSDIV.ASM Rgds, Kit ** Message: 2 Date: Sun, 29 Mar 2009 20:28:57 -0700 From: Bill Janssen bi...@ieee.org Subject: [time-nuts] state of the art devide by ten To: Discussion of precise time

Re: [time-nuts] time-nuts Digest, Vol 48, Issue 75

Alberto, In the commercial world that the Z3815A's (and quite possibly the Z3801 etc) were used in, they were installed vertically at the bottom of a large equipment cabinet that had convection air channels running within it. A bank of 12-16 fans towards the top of the cabinet sucked up ambient

Re: [time-nuts] time-nuts Digest, Vol 45, Issue 34

Dennis, Ah-ha. Now here's the rub! I've got 2 such APC Smart UPS - but I cannot find, beg, borrow or steal a copy of the PowerChute software from anywhere. Does anyone have a copy lurking unwanted unloved in their 3.5 floppy cabinet ? Cheers, Kit VK2LL Message: 4 Date: Thu, 17 Apr 2008

Re: [time-nuts] time-nuts Digest, Vol 43, Issue 46

Paul, Sorry mate, this is still over my (our?) head(s)!! Is there something going on in our part of the world (Aust-NZ) we should know about? Kit VK2LL -- Message: 8 Date: Tue, 19 Feb 2008 23:44:06 + From: Poul-Henning Kamp [EMAIL PROTECTED] Subject: Re:

[time-nuts] Parallel voltage regulators

); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY Tom C, As Bruce notes below, the LM338K is a 5 amp job with a 35v max DC input rating. Just allow adequate heatsinking otherwise the 338 will foldback due to over temperature. There's plenty of on-line help to select the

[time-nuts] TV Frequency control - slightly O/T.

); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY Just noting a few points made recently on this topic. Do not confuse the Studio colour subcarrier frequency (4.43 or 3.58 MHz) accuracy - or the digital equivalent clock frequency - with the TV transmitters carrier frequency

[time-nuts] E1938A oscillator pinning

); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY Said, The DB25 pinning is as per TVB's web site: http://www.leapsecond.com/museum/e1938a/ The EFC voltage info is as follows (courtesy of Rick K): *** The 10811 was bipolar +/-5V as you said. The cathode of the tuning

[time-nuts] Z3815A's hit the scene

is interested. (Programmes courtesy of Murray, ZL1BPU and Con, ZL2AFP) Cheers, Kit Scally VK2LL Sydney Australia ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts