Re: [time-nuts] Need recommendation for GPS antenna for Oncore GPS module
Hi Appears to be an Italian clone of the generic timing antenna. That is only a guess and it could easily be something very different …. Since it’s a part made for Erickson by somebody else, you would need their part number to properly track it down. If it’s a custom part, even that might be impossible. Bob > On Nov 4, 2018, at 12:57 PM, Toby Riddell wrote: > > I spotted this on Ebay, the price is very attractive and I saw this model > mentioned previously in the mailing list archives: > > https://www.ebay.ca/itm/Ericsson-KRE-1012082-1-GPS-Antenna-26dBi-For-HUBER-SUHNER-Bracket-84097323/272646019498?hash=item3f7af819aa:g:US8AAOSwRUhZAIhz:rk:3:pf:0=mtr > > Anyone have a manual or datasheet for it? I cannot seem to find one using > Google. > > > On Sun, 4 Nov 2018 at 12:41, Matthew D'Asaro wrote: > >> For what it is worth, I got a used HP/Symmetricom 58532a antenna off of >> eBay for about $50. It needed a minor repair (broken internal coax) but >> once that was done it has worked great for me. The other one I considered >> was the 58504a but they were more expensive on the used market and didn't >> seem as weather proof (a special weather proof cap was offered as an add-on >> but most don't have it) so I went with the newer 58532a. >> >> -Matthew D'Asaro >> >>> On Nov 4, 2018, at 8:43 AM, Toby Riddell >> wrote: >>> >>> Thanks Scott - I will look into getting one of those. And noted re. the >>> roofline! >>> On Sun, 4 Nov 2018 at 07:26, Scott McGrath wrote: For timing use ideally it should be above the roofline by at least >> several feet otherwise satellites close to the horizon will be not be visible. The generally preferred antenna is the Agilent/Keysight/Symmetricom. 58504A antenna also any outdoor antenna made by Trimble or TrueTime as >> long as antenna does not use a downconverter. On Nov 3, 2018, at 5:26 PM, Toby Riddell >> wrote: Hi all, I want to fit a GPS antenna on our house (the attic is being renovated >> and it just occurred to me that if I move fast I can get it done before the walls are closed up again!) I was planning on having it mounted on a south-facing wall but below the roofline - does this sound okay for picking up satellites? It can poke above the roofline if needed as long as the mounts are on the wall (not >> the top of the roof). Is there a recommended antenna? I am planning on feeding it into an >> Oncore GPS module which will then interface to a Soekris net4501 running >> nanoBSD and ntpns. Thanks! Toby ___ 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. ___ 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] Need recommendation for GPS antenna for Oncore GPS module
I spotted this on Ebay, the price is very attractive and I saw this model mentioned previously in the mailing list archives: https://www.ebay.ca/itm/Ericsson-KRE-1012082-1-GPS-Antenna-26dBi-For-HUBER-SUHNER-Bracket-84097323/272646019498?hash=item3f7af819aa:g:US8AAOSwRUhZAIhz:rk:3:pf:0=mtr Anyone have a manual or datasheet for it? I cannot seem to find one using Google. On Sun, 4 Nov 2018 at 12:41, Matthew D'Asaro wrote: > For what it is worth, I got a used HP/Symmetricom 58532a antenna off of > eBay for about $50. It needed a minor repair (broken internal coax) but > once that was done it has worked great for me. The other one I considered > was the 58504a but they were more expensive on the used market and didn't > seem as weather proof (a special weather proof cap was offered as an add-on > but most don't have it) so I went with the newer 58532a. > > -Matthew D'Asaro > > > On Nov 4, 2018, at 8:43 AM, Toby Riddell > wrote: > > > > Thanks Scott - I will look into getting one of those. And noted re. the > > roofline! > > > >> On Sun, 4 Nov 2018 at 07:26, Scott McGrath wrote: > >> > >> For timing use ideally it should be above the roofline by at least > several > >> feet otherwise satellites close to the horizon will be not be visible. > >> > >> The generally preferred antenna is the Agilent/Keysight/Symmetricom. > >> 58504A antenna also any outdoor antenna made by Trimble or TrueTime as > long > >> as antenna does not use a downconverter. > >> > >> > >> > >> On Nov 3, 2018, at 5:26 PM, Toby Riddell > wrote: > >> > >> Hi all, > >> > >> I want to fit a GPS antenna on our house (the attic is being renovated > and > >> it just occurred to me that if I move fast I can get it done before the > >> walls are closed up again!) > >> > >> I was planning on having it mounted on a south-facing wall but below the > >> roofline - does this sound okay for picking up satellites? It can poke > >> above the roofline if needed as long as the mounts are on the wall (not > the > >> top of the roof). > >> > >> Is there a recommended antenna? I am planning on feeding it into an > Oncore > >> GPS module which will then interface to a Soekris net4501 running > nanoBSD > >> and ntpns. > >> > >> Thanks! > >> > >> Toby > >> ___ > >> 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] Need recommendation for GPS antenna for Oncore GPS module
For what it is worth, I got a used HP/Symmetricom 58532a antenna off of eBay for about $50. It needed a minor repair (broken internal coax) but once that was done it has worked great for me. The other one I considered was the 58504a but they were more expensive on the used market and didn't seem as weather proof (a special weather proof cap was offered as an add-on but most don't have it) so I went with the newer 58532a. -Matthew D'Asaro > On Nov 4, 2018, at 8:43 AM, Toby Riddell wrote: > > Thanks Scott - I will look into getting one of those. And noted re. the > roofline! > >> On Sun, 4 Nov 2018 at 07:26, Scott McGrath wrote: >> >> For timing use ideally it should be above the roofline by at least several >> feet otherwise satellites close to the horizon will be not be visible. >> >> The generally preferred antenna is the Agilent/Keysight/Symmetricom. >> 58504A antenna also any outdoor antenna made by Trimble or TrueTime as long >> as antenna does not use a downconverter. >> >> >> >> On Nov 3, 2018, at 5:26 PM, Toby Riddell wrote: >> >> Hi all, >> >> I want to fit a GPS antenna on our house (the attic is being renovated and >> it just occurred to me that if I move fast I can get it done before the >> walls are closed up again!) >> >> I was planning on having it mounted on a south-facing wall but below the >> roofline - does this sound okay for picking up satellites? It can poke >> above the roofline if needed as long as the mounts are on the wall (not the >> top of the roof). >> >> Is there a recommended antenna? I am planning on feeding it into an Oncore >> GPS module which will then interface to a Soekris net4501 running nanoBSD >> and ntpns. >> >> Thanks! >> >> Toby >> ___ >> 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] Need recommendation for GPS antenna for Oncore GPS module
Thanks Scott - I will look into getting one of those. And noted re. the roofline! On Sun, 4 Nov 2018 at 07:26, Scott McGrath wrote: > For timing use ideally it should be above the roofline by at least several > feet otherwise satellites close to the horizon will be not be visible. > > The generally preferred antenna is the Agilent/Keysight/Symmetricom. > 58504A antenna also any outdoor antenna made by Trimble or TrueTime as long > as antenna does not use a downconverter. > > > > On Nov 3, 2018, at 5:26 PM, Toby Riddell wrote: > > Hi all, > > I want to fit a GPS antenna on our house (the attic is being renovated and > it just occurred to me that if I move fast I can get it done before the > walls are closed up again!) > > I was planning on having it mounted on a south-facing wall but below the > roofline - does this sound okay for picking up satellites? It can poke > above the roofline if needed as long as the mounts are on the wall (not the > top of the roof). > > Is there a recommended antenna? I am planning on feeding it into an Oncore > GPS module which will then interface to a Soekris net4501 running nanoBSD > and ntpns. > > Thanks! > > Toby > ___ > 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] Racal SA510 1MHz frequency standard
Hi all, just wondering whether there is any information available on the following OCXO: 1 Mc/s frequency standard Type No SA510 Racal Electronics Ltd Bracknell Berkshire Made in England All the information I have is on the second label: Pin connection 1 common -ve 2 varactor supply 3 H.T. +ve 4 O.P. shield 5 O.P. 6 18V reg 7 varactor -ve 8 varactor +ve I am surmising that the heater is around 24V, but rather than guessing, I am asking here as google has come up empty (probably wrong search term?) Kind regards, Tom Burkart ___ 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] Racal Dana 9478 frequency distribution system with option 04B high stability oven (5x10^-10/day aging rate).
It seems to be a very good price. There is a Racal Dana 9480 fully equipped with 40 outputs listed on eBay Germany for EUR 795. Nice to have but I don't need 40 outputs. vy 73 Heinz DH2FA, KM5VT Von meinem iPhone gesendet > Am 04.11.2018 um 15:05 schrieb Dr. David Kirkby > : > > On Sun, 4 Nov 2018, 11:51 David C. Partridge wrote: > >> FWIW it is trivial to modify these video distribution amps for 50 ohm >> output - you just need to change the output resistors form 75 ohm to 50 ohm >> on the board after the op-amp. >> >> David > Three was a discussion about the particular video amplifier here some years > back, as they were on eBay and someone on this list made us aware of it. > > Part of the discussion was converting to 50 ohms, but someone pointed out > it was pushing the limits of the op-amp. > > But I don't like the form factor of the unit either. > > I have for some time looking for another distribution amplifier, but I was > offered this at £150 including delivery. I think I will take it. > > Dave. > ___ > 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] Racal Dana 9478 frequency distribution system with option 04B high stability oven (5x10^-10/day aging rate).
On Sun, 4 Nov 2018, 11:51 David C. Partridge FWIW it is trivial to modify these video distribution amps for 50 ohm > output - you just need to change the output resistors form 75 ohm to 50 ohm > on the board after the op-amp. > > David > Three was a discussion about the particular video amplifier here some years back, as they were on eBay and someone on this list made us aware of it. Part of the discussion was converting to 50 ohms, but someone pointed out it was pushing the limits of the op-amp. But I don't like the form factor of the unit either. I have for some time looking for another distribution amplifier, but I was offered this at £150 including delivery. I think I will take it. Dave. ___ 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] Racal Dana 9478 frequency distribution system with option 04B high stability oven (5x10^-10/day aging rate).
Hi One would *guess* that the PLL bandwidth in the 9578 is wider than what you see in a typical GPSDO. As long as they don’t both line up at the same point, noise and phase peaking should not be a big deal. Depending on how clean your GPSDO is, the 9578 might clean things up a bit. For timing / high precision, putting another PLL into things is going to add some delay and possibly some temperature dependence. Since you are running normal test gear, neither of those issues should be significant enough to impact anything. In this environment 75 ohms vs 50 ohms is also not a big deal, but it will have slightly more impact, fix it if you can, don’t sweat it if you can’t. Bob > On Nov 4, 2018, at 5:44 AM, Dr. David Kirkby > wrote: > > I want a distribution amplifier to distribute 10 MHz from an HP GPS > receiver to various bits of test kit - spectrum analyzer, VNA, signal > generators, HP 5370B time interval counters, signal generators etc. > Currently I am using 75 ohm video amplifiers, but I suspect that is sub > optimal. I also don't like the form factor of this amplifier - I would > prefer a 19" rack mount unit. > > Does anyone know how well the Racial 9478 performs? If my understanding is > correct this is not simply an amplifier, but has its own internal high > stability reference oscillator, which then feeds 9 independent outputs, all > of which have their own amplifier. The internal OCXO will phase lock that > to an external reference. > > Fundamentally, it does not seem a great idea to me to lock one OCXO to GPS > then lock a second OCXO to the first OCXO. But maybe I am mistaken. > > I have the chance to buy one for £150 (GBP) but are a bit worried the > performance. > > Any comments? > > Dave. > ___ > 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] Need recommendation for GPS antenna for Oncore GPS module
For timing use ideally it should be above the roofline by at least several feet otherwise satellites close to the horizon will be not be visible. The generally preferred antenna is the Agilent/Keysight/Symmetricom. 58504A antenna also any outdoor antenna made by Trimble or TrueTime as long as antenna does not use a downconverter. On Nov 3, 2018, at 5:26 PM, Toby Riddell wrote: Hi all, I want to fit a GPS antenna on our house (the attic is being renovated and it just occurred to me that if I move fast I can get it done before the walls are closed up again!) I was planning on having it mounted on a south-facing wall but below the roofline - does this sound okay for picking up satellites? It can poke above the roofline if needed as long as the mounts are on the wall (not the top of the roof). Is there a recommended antenna? I am planning on feeding it into an Oncore GPS module which will then interface to a Soekris net4501 running nanoBSD and ntpns. Thanks! Toby ___ 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] Racal Dana 9478 frequency distribution system with option 04B high stability oven (5x10^-10/day aging rate).
Racal overall has a reputation for making very high quality instruments, Since the OCXO is an option,and the price is right on the DA, I’d probably buy it. Also thinking since its an option the OCXO can probably be switched out of circuit or removed entirely. Im guessing Racal thought that adding an OCXO would be a feature for shops that did not have a frequency standard and/or one that used a different frequency than ‘standard’ like a TV station. So everything would be phase locked to a master clock irrespective of frequency. Content by Scott Typos by Siri On Nov 4, 2018, at 6:50 AM, David C. Partridge wrote: FWIW it is trivial to modify these video distribution amps for 50 ohm output - you just need to change the output resistors form 75 ohm to 50 ohm on the board after the op-amp. David -Original Message- From: time-nuts [mailto:time-nuts-boun...@lists.febo.com] On Behalf Of Dr. David Kirkby Sent: 04 November 2018 10:44 To: time-nuts@lists.febo.com Subject: [time-nuts] Racal Dana 9478 frequency distribution system with option 04B high stability oven (5x10^-10/day aging rate). I want a distribution amplifier to distribute 10 MHz from an HP GPS : Currently I am using 75 ohm video amplifiers, but I suspect that is sub optimal. ___ 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.
