Dear Said,Thank you for your advise on a complete time and frequency package. I haven't heard of those models yet. I will look after your recommendation and certainly will let you know if something shows before even considering a purchase. GPS synch is a big plus as you mention. I rather be attentive to the prey coming out of the rabbit hole.
Regarding Cesium, still far away from my current budget. Not discarding the idea in the future, but I would have to learn and walk the steep learning curve of time and frequency experimentation first. Thank you for your kind advise. I will keep my eyes wide open for opportunities and how to evaluate them.
Kind regards, Edgardo Molina On Jun 30, 2012, at 11:08 AM, Said Jackson wrote:
hi Edgardo,The best one in that price range is probably the PRS-10 from SRS. New it's about $1500, sometimes they go used for $500 if you can find one they are very desirable. Can be locked to an external GPS, a huge plus. Their tube is designed for 20+ years lifetime.Has excellent ADEV and phase noise.As an external Gps consider a Motorola/iLotus M12M receiver. That combo is a professional level system, and with a bit of tinkering you can even implement sawtooth correction as described in the time nuts archives.Total cost used: under $700 with power supplies and enclosure.. But may require some patience and research to find one.Don't touch the cesium beam units unless you can get a guarantee and someone can tell you how much cesium remains in them, most of them have depleted tubes that cannot be refilled and cost more than a small car to replace with a new one.Bye, Said XE1XUS
Sent from my iPad On Jun 30, 2012, at 8:41, Edgardo Molina <xe1...@amsat.org> wrote:Dear Don,Good morning. Like probably many others, owning or collecting nice pieces of equipment probably drove me to consider an HP unit, instead of wisely doing some research on more specific and technically feasible options. The search is only beginning. Your advise is welcome. Thank you.Best regards, Edgardo Molina XE1XUS On Jun 30, 2012, at 3:05 AM, Don Latham wrote:Edgardo: For the asking price, you can do a LOT better than this Hp.There will be more opinions from more knowledgeable time-nuts regarding your choices, I would consider them carefully. Again, you do not need tospend anything like $1k US to get what you need. Don Edgardo MolinaDear Group,Good morning. I wish you well. This is my first post to the Time- Nutsgroup. Please be gentle with the newbie ;)I have been offered an HP 5065a Rubidium Frequency Standard recentlyin what I feel, a bad operational condition. I need a reliable rubidium standard for my time/frequency experiments, still I am indoubt to invest in buying such and old beast. The general situation ofthe instrument (for what I have been able to see from the first inspection) is: 100 Khz output: Not working, noise coming out of it.1Mhz output: Working, sine wave clean and not distorted, a couple of frequency meters showing 1.0000030 Mhz in frequency, the oscilloscope shows a transient pulse on top of the sine wave signal and affectingthe frequency readout instantly and then returning to the value previously mentioned. Last digits vary sporadically.5Mhz output: Working. sine wave clean but a little bit distorted whenramping up. A couple of frequency counters showing 5.0000014 Mhz in frequency. No transient pulses or other glitches around the output signal. Last digits vary sporadically.No lights coming up when the instrument turned on. No physical damageof abuse on case or internal components. No options installed . Acouple of electrolytic caps replaced on some boards, no trace of burntPCB traces or visible damage to electronic components or physicspackage. Haven't got the manual until today and was unable to check onthe front panel voltages to check on general health. As turning the voltage test selector knob, voltage is shown for most positions, except of course battery and the 100 Khz oscillator output. Somevoltage test positions get the instrument needle to go full scale andout of range, other appear to be within scale.I can perform a second visual and operational inspection today, this time with a copy of the instrument manual. I will take my own trustedfrequency counter and portable digital storage oscilloscope. Would really appreciate if I could receive comments from you experts toevaluate if such a unit could be worth buying. The asking price is $1KUSD. Should I consider it an instrument that can be repaired andserviced to show some decent performance? Or should I look somewhereelse to get a decent rubidium frequency standard. Thank you beforehand for all your kind and expert comments. Respectfully, Edgardo Molina Mexico City, Mexico _______________________________________________ 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.--"Neither the voice of authority nor the weight of reason and argument are as significant as experiment, for thence comes quiet to the mind."R. Bacon "If you don't know what it is, don't poke it." Ghost in the Shell Dr. Don Latham AJ7LL Six Mile Systems LLP 17850 Six Mile Road POB 134 Huson, MT, 59846 VOX 406-626-4304 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._______________________________________________ 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.
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