Re: [time-nuts] NTGS50AA, better than Thunderbolt?
OK, what are the differences between 37265 34310 49422 The 32765 is in one of my thunderbolts. I replaced the failed OCXO in another Thunderbolt with the 49422. The 49422 has a different pinout, is taller, and has opposite gain. Is there a difference in stability? Any pin for pin replacement for the 37265? -- Chuck Forsberg WA7KGX N2469R 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.
[time-nuts] Lady Heather command line?
Hi, can someone please tell me how to get the satellite graphic plot up on lady heather by using command line switches at program start? If I enter s then 3 when the program is running I get some displays up, but when I try to add the commands to the startup it gives me the help text. I have tried /s=3, /s3 and /s 3 but none work. I already have /f /t+10, both of which work ok, but getting the satellite display up has defeated me. Ken. ___ 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] NTGS50AA, better than Thunderbolt?
Chuck Forsberg WA7KGX N2469R wrote: OK, what are the differences between 37265 34310 49422 The 32765 is in one of my thunderbolts. I replaced the failed OCXO in another Thunderbolt with the 49422. The 49422 has a different pinout, is taller, and has opposite gain. Is there a difference in stability? Any pin for pin replacement for the 37265? 37265 - low phase noise floor (can be as low as -175dBc/Hz), high tempco 34310-T - relatively high phase noise floor (~ -150dBc/Hz). 49422 - ??. haven't measured one. Bruce ___ 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 command line?
Le 02/06/2012 09:22, ken johnson a écrit : Hi, can someone please tell me how to get the satellite graphic plot up on lady heather by using command line switches at program start? If I enter s then 3 when the program is running I get some displays up, but when I try to add the commands to the startup it gives me the help text. I have tried /s=3, /s3 and /s 3 but none work. try /gB ___ 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 command line?
Thanks Mike, that worked a treat- and next time, I will read the help file in a bit more detail- I completely missed that one! On Sat, Jun 2, 2012 at 7:07 PM, mike cook michael.c...@sfr.fr wrote: Le 02/06/2012 09:22, ken johnson a écrit : Hi, can someone please tell me how to get the satellite graphic plot up on lady heather by using command line switches at program start? If I enter s then 3 when the program is running I get some displays up, but when I try to add the commands to the startup it gives me the help text. I have tried /s=3, /s3 and /s 3 but none work. try /gB ___ 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] GPS and Rubidium frequency standards and noise question (newbie).
I am looking to get a frequency standard for my amateur radio shack, initially for verifying test gear readings, but later as a standard to lock receiver and transmitter oscillators to. I was going to buy a GPS frequency standard but a friend warned me these may have noise issues when I come to use it with an oscillator in RX / TX applications. It's not something I had considered, so what's the score here please? Should I not buy a GPS standard? Thanks. Any links to known safe suitable purchase sources from personal experience welcome, either here or by PM or e-mail. I am in the UK. -- Best regards, Chris Wilson mailto:ch...@chriswilson.tv ___ 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] GPS and Rubidium frequency standards and noise question (newbie).
If you want a frequency reference. There is nothing better than GPS. In fact it you bought a Rubidium you would still need the GPS so you could calibrate its frequency. Some GPSes might be noisy but then you can lock a good double oven crystal oscillator to it and have what they call a GPS disciplined crystal oscillator or GPSDO. On Sat, Jun 2, 2012 at 2:57 PM, Chris Wilson ch...@chriswilson.tv wrote: I am looking to get a frequency standard for my amateur radio shack, initially for verifying test gear readings, but later as a standard to lock receiver and transmitter oscillators to. I was going to buy a GPS frequency standard but a friend warned me these may have noise issues when I come to use it with an oscillator in RX / TX applications. It's not something I had considered, so what's the score here please? Should I not buy a GPS standard? Thanks. Any links to known safe suitable purchase sources from personal experience welcome, either here or by PM or e-mail. I am in the UK. -- Best regards, Chris Wilson mailto:ch...@chriswilson.tv ___ 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. -- Chris Albertson Redondo Beach, California ___ 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] GPS and Rubidium frequency standards and noise question (newbie).
On 6/2/12 2:57 PM, Chris Wilson wrote: I am looking to get a frequency standard for my amateur radio shack, initially for verifying test gear readings, but later as a standard to lock receiver and transmitter oscillators to. I was going to buy a GPS frequency standard but a friend warned me these may have noise issues when I come to use it with an oscillator in RX / TX applications. It's not something I had considered, so what's the score here please? Should I not buy a GPS standard? Thanks. Any links to known safe suitable purchase sources from personal experience welcome, either here or by PM or e-mail. I am in the UK. What's your need, frequency accuracy wise? What's your phase noise requirement? The first thing to look at would be an ovenized quartz oscillator. They're stable (aging rate is around 1E-10/day.. ) and pretty quiet (-165 dBc at 10kHz out). They run $50-100 on eBay or similar, and are pretty easy.. you hook up a 12 or 15V DC power supply and they put out 10 MHz.. Like an old HP 10811 or a Wenzel Streamline would do you nicely. (BTW, a lot of test equipment has a decent oscillator inside.. so you if you got a suitable counter or signal generator, surplus, that has a good oscillator, then you just use the reference output from the instrument. Ask on this list about candidate instruments) if 1E-10/day isn't good enough... (maybe you're doing microwave hilltopping every 6 months.. 1E-10/day would be 0.01 ppm, so your 10GHz signal would be off by 100 Hz every time you went out) Then, a GPS disciplined quartz oscillator (any of several kinds are available surplus or cobble one together yourself) is probably your best bet. Even without the GPS signal, it will typically be pretty quiet and stable (because basically it's an ovenized XO). HP Z3801As used to be common, Trimble Thunderbolts are more recent, etc. A Rb source (bunches of these on the surplus market recently) is another choice. Just like the GPS, they usually are disciplining a quartz oscillator, so the output spectral purity is really that of the quartz oscillator. Advantage of a Rb is that it works indoors or underground where there is no GPS. And, it's accurate sooner after applying power in most cases. But they DO age, and you need to adjust them (still, pretty good.. aging might be 1E-8 over 20 years. ) The lamp wears out too, so a 25 year old surplus Rb might be near end of life (or might not). google the FS725 for an example of what a current inexpensive Rb reference looks like. Surplus, the internal source can be in the $100 range, but you'll have to cobble up a power supply, and probably modify some connectors. This list has lots of people who can give you advice on this, though. But it gets back to.. how good do you need? ___ 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] GPS and Rubidium frequency standards and noise question (newbie).
Chris, To answer your question regarding using a Rubidium standard as a frequency reference for your Transverters. GPS really has nothing to do the main requirement regarding Phase Noise and your Transceivers. But the 10MHz oscillator inside the Rubidium standard is the item that will be the Phase Noise problem if you get the wrong Rubidium standard. There are cheap Rubidiums and there are good Rubidium standards to consider. An LPRO-101 is actually a very good Rubidium standard, and exhibits Phase Noise values of -96dBc/Hz @ 10Hz, -138dBc/Hz @ 100Hz, -152dBc/Hz @ 1KHz offsets from carrier. This is what I use for my 10GHz Transverter reference, but I don't lock it to GPS when in the field. LPRO-101's can be gotten pretty reasonably. Locking the LPRO-101 to a GPS will require more support circuitry, and most of the folks on this list can help you with that. Also, Thunderbolt GPS disciplined units are nice, but I do not know the Phase Noise numbers of a typical Thunderbolt unit. Others here probably know the answer to that. The important thing to remember is you don't what to use 10MHz oscillators that have poor Phase Noise performance as it will effect your weak signal capability if you use a poor Phase Noise oscillator. Jerry At 03:05 PM 6/2/2012, you wrote: If you want a frequency reference. There is nothing better than GPS. In fact it you bought a Rubidium you would still need the GPS so you could calibrate its frequency. Some GPSes might be noisy but then you can lock a good double oven crystal oscillator to it and have what they call a GPS disciplined crystal oscillator or GPSDO. On Sat, Jun 2, 2012 at 2:57 PM, Chris Wilson ch...@chriswilson.tv wrote: I am looking to get a frequency standard for my amateur radio shack, initially for verifying test gear readings, but later as a standard to lock receiver and transmitter oscillators to. I was going to buy a GPS frequency standard but a friend warned me these may have noise issues when I come to use it with an oscillator in RX / TX applications. It's not something I had considered, so what's the score here please? Should I not buy a GPS standard? Thanks. Any links to known safe suitable purchase sources from personal experience welcome, either here or by PM or e-mail. I am in the UK. -- Best regards, Chris Wilson mailto:ch...@chriswilson.tv ___ 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. -- Chris Albertson Redondo Beach, California ___ 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. Jerry Mulchin ___ 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] Austron 1250A
I just put a new (unused - not exactly new), Austron 1250A Crystal Frequency Standard on eBay should anyone be interested. -Doug Ronald ___ 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.
