Re: [time-nuts] GPDSO Distribution amp that does not radiate ?
This sounds like a shield is not connected , or broken on one of the distribution cables. The 10 MHz will not appreciably leak from half decent coax properly terminated. The 10 MHz should not be detectable unless a wire is coupled directly on the coax braid. That assumes the 10 MHz source itself is well shielded and all wires that enter or exit are firewalled . is this an attempt to distribute square or sine wave 10 MHz ? -glen On 14/07/2019 2:53 AM, Jerry O. Stern wrote: I have been using a Tbolt and TAPR TADD-1 for a few years, mainly as an external reference source for my workbench equipment. Just got a SDR radio kit (Ubitx) and trying to calibrate the local oscillators found this annoying substantial 10MHz signal heterodyning with the LO's (45MHz and 12MHz). Taking a look on my SA with just a broad band telescopic antenna in the SA input, I see a 10MHZ at about -55 dBm and no other signals > -120 dBm. The Tbolt is about 4-5' away from the workbench BUT I disconnected everything and it is only connected to the TADD-1 distribution amplifier The TADD has no distribution coaxes attached, it is in the TAPR metal cabinet which I always thought was well shielded and every port has been terminated with 50 Ohm dummy load plugs. When I take the TADD-1 out of the equation and just run the Tbolt into a 50 ohm termination plug, the 10MHz signal on my SA drops down to > -90 dBM. I duplicated this with a Lucent RFTGm-Xo/Rb pair and the TADD-1 with similar results.Has anyone else seen this with their distribution amp? Jerry ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] Control and monitor program for Spectracom 8195B
Hi My solution is to kidnap Mark’s pet goldfish and hold it captive until the specific device is incorporated into LH …. :). In the case of expensive or rare gear lending out a device might get things going faster than the goldfish maneuver …. Bob > On Jul 14, 2019, at 4:06 AM, Hal Murray wrote: > > >> I have so many GPSDOs now that I cannot possibly remember command for each. > > My solution for that is to keep a small text file with minimal notes on how > things work and chunks of text that I can copy/paste. > > Sometimes, I include URLs for where I found good info. > > > -- > These are my opinions. I hate spam. > > > > > ___ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] Galileo service currently degraded
Having just been through the endian issue with a similar parser, I'll mention that in Python the struct.unpack() function can handle endian swaps at tne same time as it pulls binary data out of the message. It makes it pretty painless. On Jul 13, 2019, 11:08 PM, at 11:08 PM, Mark Sims wrote: >Lady Heather is open source and has parsers/decoders for just about any >receiver you are likely to see... and a few that your aren't.One >big issue with binary protocols is handling big/little endian (byte >order) issues when reading messages or sending them to the device. You >need to be aware of what the system CPU uses and what the receiver >uses. > > > >> One alternative, if you only need two lines is to write a parser >just for them. >There’s not a whole lot to the protocol and the uBlox doc’s are pretty >good at >describing it. Yes, it’s a binary protocol so there will be a bit of >this and that >involved. >___ >time-nuts mailing list -- time-nuts@lists.febo.com >To unsubscribe, go to >http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com >and follow the instructions there. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] Galileo service currently degraded
Super slow from Canada too. Does eventually respond. They might be seeing a little more traffic than they usually get... On 14/07/2019 3:49 AM, Bj??rn wrote: InsideGNSS is responding really slow (only from Sweden?) My phone browsers gave up. My computer Mozilla finally got it. /Bj??rn On 14 Jul 2019, at 08:24, Leif Johansson wrote: That site seems to be down now Skickat fr??n min iPhone 14 juli 2019 kl. 00:14 skrev Michael Wouters : The Galileo outage is being attributed to problems at the Precise Timing Facility in Italy https://insidegnss.com/update-galileo-service-degraded-on-all-satellites-precise-timing-facility-problems-cited/ Cheers Michael On Sun, 14 Jul 2019 at 7:06 am, Mark Sims wrote: The satellite tracking / health info is sent by the receiver. Heather just reports what the receiver is sending. Oh, and the Galileo system status has changed from "degraded" to "service outage". https://www.gsc-europa.eu/system-status/Constellation-Information What is amazing is that I can find no other reports that the system is down. Also how such a long and severe outage could happen. I expect heads will be rolling... -- What prompts Heather to mark visible satellites as yellow, and not use them? ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] Control and monitor program for Spectracom 8195B
> I have so many GPSDOs now that I cannot possibly remember command for each. My solution for that is to keep a small text file with minimal notes on how things work and chunks of text that I can copy/paste. Sometimes, I include URLs for where I found good info. -- These are my opinions. I hate spam. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] Galileo service currently degraded
-Original Message- From: Leif Johansson Sent: Sunday, July 14, 2019 7:24 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Galileo service currently degraded That site seems to be down now = See: https://web.archive.org/web/20190714012836/https://insidegnss.com/galileo-interruptus/ Cheers, David -- SatSignal Software - Quality software for you Web: http://www.satsignal.eu Email: david-tay...@blueyonder.co.uk Twitter: @gm8arv ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] Galileo service currently degraded
InsideGNSS is responding really slow (only from Sweden?) My phone browsers gave up. My computer Mozilla finally got it. /Björn > On 14 Jul 2019, at 08:24, Leif Johansson wrote: > > That site seems to be down now > > Skickat från min iPhone > >> 14 juli 2019 kl. 00:14 skrev Michael Wouters : >> >> The Galileo outage is being attributed to problems at the Precise Timing >> Facility in Italy >> >> https://insidegnss.com/update-galileo-service-degraded-on-all-satellites-precise-timing-facility-problems-cited/ >> >> Cheers >> Michael >> >> >>> On Sun, 14 Jul 2019 at 7:06 am, Mark Sims wrote: >>> >>> The satellite tracking / health info is sent by the receiver. Heather >>> just reports what the receiver is sending. >>> >>> Oh, and the Galileo system status has changed from "degraded" to "service >>> outage". >>> >>> https://www.gsc-europa.eu/system-status/Constellation-Information >>> >>> What is amazing is that I can find no other reports that the system is >>> down. Also how such a long and severe outage could happen. I expect heads >>> will be rolling... >>> >>> -- >>> What prompts Heather to mark visible satellites as yellow, and not use >>> them? >>> ___ >>> time-nuts mailing list -- time-nuts@lists.febo.com >>> To unsubscribe, go to >>> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com >>> and follow the instructions there. >>> >> ___ >> time-nuts mailing list -- time-nuts@lists.febo.com >> To unsubscribe, go to >> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com >> and follow the instructions there. > > ___ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] Galileo service currently degraded
> On 14 Jul 2019, at 00:25, Mark Sims wrote: > > A report that the outage is due to a failure at the Galileo "precise time > facility" in Italy. It has all their cesiums and a maser. Hmmm... no > backup facility... sounds like a recipe for disaster? To my knowledge both Italian and German control centers have an identical PTF. Do you have any reference to there not being an PTF at Oberpfaffenhofen? Additional there are backup service from some European national UTC labs. Don’t know if this is “online backup” if neither control center has working time. Still failover has obviously not worked - if the PTF(s) were at fault - as per Insidegnss... Also note that Galileo operational service levels are incrementing from Initial Service (where we are now), to Enhanced Service (hopefully soon), to IOC and finally FOC. > Service outage may last over 90 hours. Can Galileo absorb this within the service level stated in Initial Service documents? https://www.gsc-europa.eu/system/files/documents/Galileo-OS-SDD.pdf (Page 26) Availability of OS UTC service - >87% over 30days. Equals outage of 3.9days (93.6h) for a 30 day period. /Björn ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] Galileo service currently degraded
That site seems to be down now Skickat från min iPhone > 14 juli 2019 kl. 00:14 skrev Michael Wouters : > > The Galileo outage is being attributed to problems at the Precise Timing > Facility in Italy > > https://insidegnss.com/update-galileo-service-degraded-on-all-satellites-precise-timing-facility-problems-cited/ > > Cheers > Michael > > >> On Sun, 14 Jul 2019 at 7:06 am, Mark Sims wrote: >> >> The satellite tracking / health info is sent by the receiver. Heather >> just reports what the receiver is sending. >> >> Oh, and the Galileo system status has changed from "degraded" to "service >> outage". >> >> https://www.gsc-europa.eu/system-status/Constellation-Information >> >> What is amazing is that I can find no other reports that the system is >> down. Also how such a long and severe outage could happen. I expect heads >> will be rolling... >> >> -- >> >>> What prompts Heather to mark visible satellites as yellow, and not use >> them? >> ___ >> time-nuts mailing list -- time-nuts@lists.febo.com >> To unsubscribe, go to >> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com >> and follow the instructions there. >> > ___ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
