Re: [time-nuts] Toy radiolocation and LORAN envelope

2014-05-27 Thread Graeme Zimmer
Hello Andrea, The angle could be found with a directional antenna or inerferometry, but about the distance? About the only reliable way to locate hidden transmitters is by field strength. The problem in built-up areas is reflections. At one time Doppler DF systems were popular, but anybody

Re: [time-nuts] Wenzel oscillator - L1 value?

2014-04-23 Thread Graeme Zimmer
Most crystals are cut to be terminated with a certain capacitance. If you adjust this capacitance you can vary the frequency slightly. However if you terminate the crystal with a series tuned circuit (LC) you can vary the reactance over a much wider range, and consequently get a wider

Re: [time-nuts] Power Supply for AD9852 / AD9854

2014-03-16 Thread Graeme Zimmer
I would assume that using two voltage regulators will spread the load. For the AD9851 I'am planning to put external radiator glued on top of it. One of my commercial projects used eight x AD9852. During development they definitely needed small heat sinks glued on top of each chip. I

Re: [time-nuts] Power Supply for AD9852 / AD9854

2014-03-16 Thread Graeme Zimmer
My versions of a DDS using two AD9910 in Quadrature http://members.wideband.net.au/gzimmer/QuadDDS/default.html regards ... Zm ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] Power Supply for AD9852 / AD9854

2014-03-16 Thread Graeme Zimmer
Unless it’s already on a board, this is not a simple chip to use in a home environment. Nevertheless, some of us do manage. But it's true, the AD9852/AD9854 does run very hot. It's worth mentioning that the AD9910/AD9912 family runs much cooler. Mine aren't even warm to the touch. This of

Re: [time-nuts] A small piece on HP's hydrogen maser in 1968

2014-02-24 Thread Graeme Zimmer
http://www.hp.com/hpinfo/abouthp/histnfacts/publications/measure/pdf/1968_09.pdf This broken link business is very common in some browsers (in Windows). It's because there's an underline in the original URL. When the browser sees a link it underlines it in blue, which converts the

Re: [time-nuts] New WWVB modulation format receivers (NOT)

2014-02-20 Thread Graeme Zimmer
One of the simplest ways to receive VLF signals is to buy a surplus Selective Level Meter. They were an important piece of test equipment used by the analog line-line telephony people. Now of course, surplus to requirements. If you hunt around they can be found at very low prices.

Re: [time-nuts] New WWVB modulation format receivers

2014-02-20 Thread Graeme Zimmer
Several years ago I spotted a clever PIC-based software (DSP-ish) approach to WWVB modulation Perhaps it was mine? Years ago I designed a PSK31 decoder using a PIC. It worked very well for fixed frequencies, but I concluded that making it tunable was beyond the resources of the PICs then

Re: [time-nuts] New WWVB modulation format receivers (NOT)

2014-02-20 Thread Graeme Zimmer
I have a Kenwood TS-940S transceiver that can receive 60 kHz but I have never heard anything Where are you? It must be deaf as a post. I can hear WWVB in Australia ! (or at least I could till JJY-60 started in 2001) ... Zim ___ time-nuts

Re: [time-nuts] How to open solder-sealed OCXOs?

2014-02-02 Thread Graeme Zimmer
What's the best way to open an OCXO in the typical solder-sealed tinned steel can? Use a high wattage iron to melt the solder at one point, prise the gap open with a flat screwdriver, then work along the join. Solder is soft. so once you get it started you should be able to roll it open

Re: [time-nuts] Nortel GPSDO osc age alarm

2014-01-24 Thread Graeme Zimmer
9.8304 MHz output, an odd frequency used by the cell tower equipment 9.8304 MHz is 8 x 1.2288 MHz which is the CDMA PN chip rate a rather fundamental frequency to the CDMA phone system Zim ___ time-nuts mailing list -- time-nuts@febo.com

Re: [time-nuts] Local Solar Time Clock

2014-01-19 Thread Graeme Zimmer
An electro-mechanical RX for VLF. http://www.wireless.org.uk/mechrx.htm enjoy ___ 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 there.

Re: [time-nuts] Lady Heather and the NTGS50AA

2014-01-18 Thread Graeme Zimmer
Ignatio, Not exactly what you have asked, but I notice that Trimble Tboltmon won't connect to a device which requires Odd parity. You can select Odd parity, but it fails to connect, and the details at the bottom remain fixed at N,8,1 So for Odd parity I can only use Trimble Studio. I

[time-nuts] Trimble Resolution SMTx GPS Timing Receiver:

2014-01-13 Thread Graeme Zimmer
Hi folks, I have my little Trimble Resolution SMTx GPS module running. Details at: http://members.wideband.net.au/gzimmer/Time/default.html later ... Zim ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] Trimble Studio, what is it?

2014-01-12 Thread Graeme Zimmer
Did you mean 2.01.6 or is there a newer version? Version 2.01.6 is the latest version I've seen. It's the first which drops the beta label. ... Zim ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] Trimble Studio, what is it?

2014-01-12 Thread Graeme Zimmer
Folks, Nigel GM8PZR explained all this very thoroughly a few days ago... It seem there are more than one development thread of Thrimble Studio running. I've seen at least three versions. This link gives you version V1.23.0 11/20/2013 (status beta)

[time-nuts] Trimble Studio, what is it?

2014-01-12 Thread Graeme Zimmer
Hi Dave, That link to mmnt.net resulted in some strange russian gaming site Yes, somehow I posted the wrong link. It should have been: ftp://ftp.trimble.com/pub/sct/misc/bin/TrimbleStudio I don't see any difference in the V1.23.0.0 and the V2.01.6 Try the update function in Help. On mine it

Re: [time-nuts] WAAS.....

2014-01-09 Thread Graeme Zimmer
Hi Brian, Thanks for the fascinating story! For that matter, is anyone running one of the new multi-system receivers? I hope to play with Resolution SMT GG which is the Multi-GNSS version of the Desolution SMT. What I'm keen to find out is which of the standard GPS diagnostic software

Re: [time-nuts] Motorola GPS antenna type GCNT20A3A

2014-01-06 Thread Graeme Zimmer
On 12/12/2013 10:57 AM, Russ Ramirez wrote: FYI, in case anyone should be interested. $20 http://www.goldmine-elec-products.com/prodinfo.asp?number=G19738 Motorola GCNT20A3A +25db Antenna. For what it's worth, I purchased one of these and it eventually arrived after a rather round-about

Re: [time-nuts] Trimble Studio, what is it?

2014-01-05 Thread Graeme Zimmer
Hi Chris, I see occasional references to Trimble Studio here. What is it please? For a list of features, see: http://www.wavedigm.com/xe/studio That page also has a Users Guide and the application itself. regards Zim ___

[time-nuts] Trimble: Using RS-232 via with USB adapter

2014-01-03 Thread Graeme Zimmer
Hi folks, This has probably been covered before, but I thought it worth knowing I wanted to use my new laptop with my Trimble/Nortel GSP receiver. As my laptop doesn't have an RS-232 port, I purchased a cheap USB to RS-232 adaptor. After a few false starts I found that the older Tboltmon

Re: [time-nuts] Trimble: Using RS-232 via with USB adapter

2014-01-03 Thread Graeme Zimmer
Sorry, that doesn't make much sense, does it... I just realised that TrimbleStudio is not just USB. It runs quiet happily with RS-232 . Zim ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] Trimble Thunderbolt 1pps

2014-01-03 Thread Graeme Zimmer
Interesting discussion re getting the 1PPS into a PC to synchronise a timing program. I use WSPR for ham radio and was wondering how to do this. Can you tell me which (Windows) time synch programs can use the 1PPS on DCD of the RS232 interface please? Next step would be to build a variable

Re: [time-nuts] Trimble Thunderbolt 1pps

2014-01-03 Thread Graeme Zimmer
Can you tell me which (Windows) time synch programs can use the 1PPS on DCD of the RS232 interface please? To answer my own question: Here's one... http://www.visualgps.net/NMEATime/default.htm There are a few others listed at http://www.gpskit.nl/links-en.htm Zim

Re: [time-nuts] Trimble Thunderbolt 1pps

2014-01-03 Thread Graeme Zimmer
Unless you bring the 1pps in and synchronize with that, you are probably better off just running NTP. Yes, that is the idea. I often don't have access to the Internet when running WSPR. eg when operating portable in remote areas or marine. Thanks . Zim

Re: [time-nuts] sysclock source for AD9912 DDS?

2013-12-30 Thread Graeme Zimmer
Hi Anders, Have a look at my AD9910 quadrature DDS http://members.wideband.net.au/gzimmer/QuadDDS/default.html I used a Crystek 1GHz SAW oscillator regards Zim ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] Trimble/Nortel 45000 GPS Locked Reference Oscillatorboard

2013-12-24 Thread Graeme Zimmer
Hi Dave, Thanks for your post. I'd like to see some of your LH traces if you don't mind... Do you mean with the Lady Heather software? I'll leave it running a while and collect some data. Yes, I did hesitate running it on AC, but it draws little current and does seem to be happy enough.

[time-nuts] Trimble/Nortel 45000 GPS Locked Reference Oscillator board

2013-12-23 Thread Graeme Zimmer
Hi Folks, I though you might be interested in a couple of my recent projects... I purchased a Trimble/Nortel 45000 GPS Locked Reference Oscillator board on ebay and used it to drive my Silicon Chip Magazine High Resolution Frequency Counter. Details at