Re: [time-nuts] OT - Old Hatfield 2105 Step attenuator specs
Alberto, many thanks but I need just to calibrate (I should say invent) a S-Meter for a BITX20a QRP Radio, and possibly double check the sensitivity in some very relaxed way. My equipment: - MiniVNA Pro with a 2 signal generators from approximately 0 to -60dBm (not clear if they have an additional 12 or 18 dB attenuator inside). Obviously it is not calibrated nor checked. - The 2105 - Dummy load and VNA calibration set (short, open and 50Ohm dummy load) - several SMA/BNC adapters (probably not enough ones) I need the typical -73dBm and something in the -112dB range to be satisfied. I don't know if and how much the MiniVNA is accurate, I should ask some ham in ARI to double check it. Toto I have a feeling we are not in Agilent anymore... Giuseppe Marullo IW2JWW On 1/10/2014 4:50 PM, Alberto di Bene wrote: On 1/8/2014 11:13 PM, Alan Melia wrote: /Hi Alberto it is quite interesting to continue that test with no attenuator but the shells of the coax plugs connected together. I would guess with the gear you have the resultant would be at least 120dB downbut this is not the case for all signal generators!/ Hi Alan, quite true. I performed the test you suggested, using as generator a RohdeSchwarz SMDU that has a calibrated output down to -140 dBm, so it must be well shielded... I used 10 MHz as frequency, and, given that the settings of this forum do not allow HTML (why ?) these are the links to the screen captures stored on my Dropbox account. As selective voltmeter I used the ELAD FDM-S1 receiver together with, guess what... Winrad :-) This is what I see with the Hatfield attenuator set to its maximum, i.e. 100 dB : https://dl.dropboxusercontent.com/u/15089947/hatfield-100dB.gif Setting it to 0 dB gives this result : https://dl.dropboxusercontent.com/u/15089947/hatfield0dB.gif So you can see that the difference between the two measures is just 88 dB, not the theoretical 100... And it is almost all to be attributed to internal leakage of the attenuator, because, excluding the attenuator, and just connecting together the two BNC shells, leaving the center pin unconnected, gives this : https://dl.dropboxusercontent.com/u/15089947/hatfield-shells.gif So the Hatfield attenuator IMHO can be fruitfully used only if you do not pretend from it the utmost precision at high attenuation settings. 73 Alberto I2PHD ___ 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. ___ 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] Trimble Resolution SMTx GPS Timing Receiver:
Is there a version with 10 MHz output? That would be useful. On 01/13/2014 09:44 PM, Graeme Zimmer wrote: 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 https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. -- Chuck Forsberg WA7KGX c...@omen.com www.omen.com Developer of Industrial ZMODEM(Tm) for Embedded Applications Omen Technology Inc The High Reliability Software 10255 NW Old Cornelius Pass Portland OR 97231 503-614-0430 ___ 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] Loran-C radio navigation
Hi Matthias, what kind of beta testing other than just receiving a LORAN signal do you need? I live near Bremen and I can receive the Loran signal from the Sylt chain pretty well. My Stanford Research FS700 and my Symmetricon Z3805 run 24/7/365 and I am well equipped with measurement stuff. Best regards Ulrich Bangert Ortholzer Weg 1 27243 Gross Ippener Tel 04224 95071 Fax 04224 95072 Mob 0172 800 6546 df...@ulrich-bangert.de -Ursprungliche Nachricht- Von: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] Im Auftrag von Matthias Koch Gesendet: Montag, 13. Januar 2014 17:12 An: time-nuts@febo.com Betreff: [!! SPAM] [time-nuts] Loran-C radio navigation Dear timing geeks and frequency wizards, I wish to announce a software defined Loran-C longwave radio navigation receiver running on STM32F407 ! If you happen to live somewhere on earth with Loran-C signal coverage like Europe and parts of Asia, I would like to get in contact with you for beta testing out in the wild. The first experimental release is available now on download section on http://mecrisp.sourceforge.net/ I have been invited to this list by a discussion on http://forum.stellarisiti.com/topic/1807-loran-c-radio-navigation/ Best wishes from Germany, Matthias Koch ___ 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. ___ 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] Loran-C radio navigation
Matthias, I am based near Bristol in the South West of the UK. I can receive Anthorn in the UK and several of the French chain of transmitters - I have a prototype UrsaNav Loran receiver. Have a reasonably equipped lab for timing; GPS disciplined SRS FS725 rubidium and an Agilent 53230A TIC. Let me know if I can help, Regards, Robert. On 13 January 2014 16:11, Matthias Koch matthias.k...@hot.uni-hannover.dewrote: Dear timing geeks and frequency wizards, I wish to announce a software defined Loran-C longwave radio navigation receiver running on STM32F407 ! If you happen to live somewhere on earth with Loran-C signal coverage like Europe and parts of Asia, I would like to get in contact with you for beta testing out in the wild. The first experimental release is available now on download section on http://mecrisp.sourceforge.net/ I have been invited to this list by a discussion on http://forum.stellarisiti.com/topic/1807-loran-c-radio-navigation/ Best wishes from Germany, Matthias Koch ___ 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. ___ 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] Loran-C radio navigation
Dear Paul, thank you ! Instructions are included in the source package, you will need a signal of about 1.5V DC and 0.5V amplitude. The analog-digital converters are single ended and accept voltage levels between GND and Vcc which is about 3V. You can enjoy my native code Forth compiler on the MSP430 Launchpads, too, and try Ledcomm, but for Loran-C you need a STM32F407 Discovery board which has enough RAM for circular GRI buffer. I would be glad if you could sample signals with your Loran-C simulator to check if it is running fine. Matthias ___ 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.
[time-nuts] also contins lanolin
Vey Interesting! http://www.kickstarter.com/projects/652945597/red-pitaya-open-instruments-for-everyone production Real Soon Now. Don -- The power of accurate observation is commonly called cynicism by those who have not got it. -George Bernard Shaw Dr. Don Latham AJ7LL Six Mile Systems LLC 17850 Six Mile Road POB 134 Huson, MT, 59846 VOX 406-626-4304 Skype: buffler2 www.lightningforensics.com www.sixmilesystems.com ___ 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] fast edge, rise time.
You might be interested to know this was discussed in a paper by Jim Andrews (founder of Picosecond Pulse Laboratories): http://www.nist.gov/calibrations/upload/im-25-4.pdf From the age of the paper, I'd say this generator is probably more than 40 years young. On Mon, Jan 13, 2014 at 2:22 PM, Bill Reed br...@otelco.net wrote: Hi, Since there is no interest in my pulse generator maybe one of you knows someone at NBS who can provide a schematic of the generator. It has NBS Impulse Generator SN 3-75-2 engraved on the front panel and is ~ 10 x 16 x 17. Thanks, Bill Reed -Original Message- From: Bill Reed Sent: Tuesday, January 07, 2014 7:53 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] fast edge, rise time. Hi, Since you guys are interested in fast pule generators, I have one you may be interested in. I got it in govt. auction about 25 years ago for ~ $ 50.00. I will sell it to anyone for $ 50.00 plus shipping. I prefer to sell to someone who will restore and use it rather than parting it. It has more than $ 50.00 parts in it. There are a 30 turn 6.5 inch diameter hard line, wide band hybrid coupler, diode assembly and several adapters and attenuators. I believe the hard line discharges into a step diode. The power supply includes 200 V plus other voltages. If I remember correctly ( I have no high speed scope now ) the pulse is 2 nanoseconds wide with a 280 picosecond rise time and and 2.5 Vpp. I checked with a 200 MHz digital scope and can see a pulse that verifies my scopes bandwidth. The rate generator works but has problems. See facebook (ree...@otelco.net) for pictures under Impulse. Bill Reed256 586-3446 -Original Message- From: ct1dmk Sent: Sunday, December 29, 2013 7:36 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] fast edge, rise time. Thank you all for your comments on this subject. Happy new year. Luis Cupido. ct1dmk. ___ 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. ___ 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. ___ 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. ___ 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] Trimble Resolution SMTx GPS Timing Receiver:
Hi Zim Your project's looking good, but given that your next step is to design a board for it I'm intrigued as to why you didn't just go for the Trimble version on a carrier board? Have you seen the PPS-Piggy from Michael Tharp, another list member, it mates with the Resolution T and SMT boards, contains a power supply for them, and also provides USB and RS232 interfaces?.. https://www.tindie.com/products/gxti/pps-piggy/ I was also interested to see your Trimble software Labelled as Resolution SMTx Monitor, this is a version I've not come across before and searching for it hasn't had any success either, do you have a URL for this please, or are you able to share a copy? Regards Nigel GM8PZR In a message dated 14/01/2014 05:45:17 GMT Standard Time, gzim...@wideband.net.au writes: 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 https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ 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] also contins lanolin
Hmm, Input dynamic range of 1.2V Pk-Pk and 125Msps, like that's going to replace ALL my test equipment. It's also not clear if they are in Newport VA or Slovenia, but the plug on the mains adaptor says Slovenia. I'm stunned that 826 people would consider spending hundreds of dollars on this toy. It doesn't even have a case to protect it. Robert G8RPI. From: Don Latham d...@montana.com To: time nuts time-nuts@febo.com Sent: Tuesday, 14 January 2014, 17:50 Subject: [time-nuts] also contins lanolin Vey Interesting! http://www.kickstarter.com/projects/652945597/red-pitaya-open-instruments-for-everyone production Real Soon Now. Don -- The power of accurate observation is commonly called cynicism by those who have not got it. -George Bernard Shaw Dr. Don Latham AJ7LL Six Mile Systems LLC 17850 Six Mile Road POB 134 Huson, MT, 59846 VOX 406-626-4304 Skype: buffler2 www.lightningforensics.com www.sixmilesystems.com ___ 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. ___ 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] Interesting HP oscillators...
On 1/13/2014 7:36 PM, Rex wrote: This document lists that part number... http://www.leapsecond.com/museum/10811a/90027-1.pdf It says (I think -- in a quick scan) that it is mostly the same specs as a 10811 D/E except a narrower EFC tuning range. When HP was doing the smart clocks circa 1997, they ignored my advice against trying to steer the EFC in favor of using a fix tuned oscillator followed with a synthesizer. The reason for this was the lack of suitable DAC's, and even if you found one, then you have to have a suitable reference source with low enough noise, and even if you found one, it would have to be ovenized. The E1938A had an available ovenized reference, however, the 10811 (as everyone knows) has only a Zener diode, and it is not very well ovenized This version (which I never heard of until now) probably ditched the Zener diode which (besides eliminating drift from the Zener) narrowed the EFC range. Narrowing the EFC range on the 10811 was a band aid that contributed another bit or three to the error budget. You had to make some assumption about long term aging and how often it was OK to ask the customer to readjust the mechanical trimmer. Also, there was the fact that no base station was going to be in service for more than a few years, as it would be obsolete by that time. Rick N6RK ___ 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] Loran-C radio navigation
Mathias OK I see that I need a different board then. Let me take a look. I think thats the $12 board On Tue, Jan 14, 2014 at 6:14 AM, Matthias Koch matthias.k...@hot.uni-hannover.de wrote: Dear Paul, thank you ! Instructions are included in the source package, you will need a signal of about 1.5V DC and 0.5V amplitude. The analog-digital converters are single ended and accept voltage levels between GND and Vcc which is about 3V. You can enjoy my native code Forth compiler on the MSP430 Launchpads, too, and try Ledcomm, but for Loran-C you need a STM32F407 Discovery board which has enough RAM for circular GRI buffer. I would be glad if you could sample signals with your Loran-C simulator to check if it is running fine. Matthias ___ 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. ___ 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] Loran-C radio navigation
I see it in the US its 14.88. Not bad at all. But needing a 1/2 V signal is indeed a huge challenge over here. It requires gain stages and filters and the curse of feedback. But as you say the simulator makes that far less of an issue. :-) Regards Paul On Tue, Jan 14, 2014 at 2:23 PM, paul swed paulsw...@gmail.com wrote: Mathias OK I see that I need a different board then. Let me take a look. I think thats the $12 board On Tue, Jan 14, 2014 at 6:14 AM, Matthias Koch matthias.k...@hot.uni-hannover.de wrote: Dear Paul, thank you ! Instructions are included in the source package, you will need a signal of about 1.5V DC and 0.5V amplitude. The analog-digital converters are single ended and accept voltage levels between GND and Vcc which is about 3V. You can enjoy my native code Forth compiler on the MSP430 Launchpads, too, and try Ledcomm, but for Loran-C you need a STM32F407 Discovery board which has enough RAM for circular GRI buffer. I would be glad if you could sample signals with your Loran-C simulator to check if it is running fine. Matthias ___ 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. ___ 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.
[time-nuts] New GPS chips on Indegogo
This isn't drawing lots of attention, but really looks promising: http://bit.ly/1dBpits or http://t.cn/8FvCEX7 Regular GPS or Chinese version or RAW. The first two presently Arduino compatible. For not much money. Hope it gets funded. N0UU ___ 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] Loran-C radio navigation
Just ordered the STM discovery kit. Will take about 1 week. On Tue, Jan 14, 2014 at 2:28 PM, paul swed paulsw...@gmail.com wrote: I see it in the US its 14.88. Not bad at all. But needing a 1/2 V signal is indeed a huge challenge over here. It requires gain stages and filters and the curse of feedback. But as you say the simulator makes that far less of an issue. :-) Regards Paul On Tue, Jan 14, 2014 at 2:23 PM, paul swed paulsw...@gmail.com wrote: Mathias OK I see that I need a different board then. Let me take a look. I think thats the $12 board On Tue, Jan 14, 2014 at 6:14 AM, Matthias Koch matthias.k...@hot.uni-hannover.de wrote: Dear Paul, thank you ! Instructions are included in the source package, you will need a signal of about 1.5V DC and 0.5V amplitude. The analog-digital converters are single ended and accept voltage levels between GND and Vcc which is about 3V. You can enjoy my native code Forth compiler on the MSP430 Launchpads, too, and try Ledcomm, but for Loran-C you need a STM32F407 Discovery board which has enough RAM for circular GRI buffer. I would be glad if you could sample signals with your Loran-C simulator to check if it is running fine. Matthias ___ 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. ___ 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.
