Re: [time-nuts] Does TIME-NUTS LIST-SERV allow CLASSIFIED For-Sale private advertisment?
You must also bear in mind that this a world-wide list. personally I would not be interested in sales of test equipment within the US, and I would not look here for equipment I might like to own. (Others in the Europe might) However, I would not object to a note that some gear is avilable and a detailed description or list can be viewed at... (maybe the trader site?) Many may seek to move unwanted or superceded gear to like minded collegues rather than be ripped off by a dealer on an auction site. This is to be encouraged in some part, but remember that I, and many others are members to share in the astonishing technical expertise available to all in the group. I remember that like OTs and discussions that go cosmic I always have the delete key. :-)) Thanks for a great communitylong may it flourish! Alan G3NYK - Original Message - From: Magnus Danielson mag...@rubidium.dyndns.org To: time-nuts@febo.com Sent: Monday, October 18, 2010 8:15 PM Subject: Re: [time-nuts] Does TIME-NUTS LIST-SERV allow CLASSIFIED For-Sale private advertisment? On 10/18/2010 06:31 PM, John Ackermann N8UR wrote: We've never had a hard-and-fast rule, but in general the community seems OK with (a) non-dealers making occasional postings about TF related items (i.e., excess or housecleaning items), and (b) commercial sellers making *very* occasional postings about unusual items. I think John agrees with me that occasional information on availability of DIY-related PCBs/kits (such as the PICTIC) created by fellow time-nuts is also OK. So is the case when people has come over a bunch of components which is hard to get. Periodic ads, or general we have the following items ads, would not be appropriate. At bottom, this is intended to be a technical discussion forum, and not a swap shop. We could have a separate time-nuts classified side-kick list, it would be much easier to direct other stuff there to keep clean. Just a thought. Cheers, Magnus ___ 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] HP 10811
I plan on replacing the Xtal Osc. of my HP 5062C with a HP 10811 since I have a few ones with AV less than 1E-12 from 1 to 100 sec. I would like to use the +18 Volt in the unit for heater. Has any one experience with running the 10811 below 20 Volt, any thing I should look out for? Thanks Bert Kehren Miami ___ 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] HP 10811
I think you should probably be fine at 18V. The oven will run down to at least 15V and maybe 12V. Rick Karlquist N6RK On 10/19/2010 5:27 AM, ewkeh...@aol.com wrote: I plan on replacing the Xtal Osc. of my HP 5062C with a HP 10811 since I have a few ones with AV less than 1E-12 from 1 to 100 sec. I would like to use the +18 Volt in the unit for heater. Has any one experience with running the 10811 below 20 Volt, any thing I should look out for? Thanks Bert Kehren Miami ___ 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] HP 10811
Thank you Rick, you obviously must know. Bert Kehren In a message dated 10/19/2010 12:02:11 P.M. Eastern Daylight Time, rich...@karlquist.com writes: I think you should probably be fine at 18V. The oven will run down to at least 15V and maybe 12V. Rick Karlquist N6RK On 10/19/2010 5:27 AM, ewkeh...@aol.com wrote: I plan on replacing the Xtal Osc. of my HP 5062C with a HP 10811 since I have a few ones with AV less than 1E-12 from 1 to 100 sec. I would like to use the +18 Volt in the unit for heater. Has any one experience with running the 10811 below 20 Volt, any thing I should look out for? Thanks Bert Kehren Miami ___ 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] WWVB 60 kHz Loop Antenna Progress
In message 4cbde533.9080...@att.net, Brooke Clarke writes: Hi: I've been winding a number of loops for WWVB and have one that looks good on test equipment. You should do a test where you warm the rod+windings in your hand, I found the center frequency would drift significantly with even minor temperature changes. It would of course not be unreasonable to temperature compensate a ferrite rod antenna, but I have been wondering if it would be possible to build a SDR receiver for 60kHz (or 77.5kHz) where the CPU autotunes the high-Q antenna based on the detected signal, but have not gotten the necessary round tuit. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. ___ 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] WWVB 60 kHz Loop Antenna Progress
Hi Also consider that there is a maximum practical Q for a rod antenna. Past a certain point the Q goes up because the flux is better contained. For an antenna to work, the flux can't be fully contained. Simply put, a toroid or pot core will make a very high Q inductor. Both make really lousy antennas. Bob On Oct 19, 2010, at 5:54 PM, Poul-Henning Kamp wrote: In message 4cbde533.9080...@att.net, Brooke Clarke writes: Hi: I've been winding a number of loops for WWVB and have one that looks good on test equipment. You should do a test where you warm the rod+windings in your hand, I found the center frequency would drift significantly with even minor temperature changes. It would of course not be unreasonable to temperature compensate a ferrite rod antenna, but I have been wondering if it would be possible to build a SDR receiver for 60kHz (or 77.5kHz) where the CPU autotunes the high-Q antenna based on the detected signal, but have not gotten the necessary round tuit. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. ___ 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] WWVB 60 kHz Loop Antenna Progress
On 10/19/2010 11:59 PM, Bob Camp wrote: Hi Also consider that there is a maximum practical Q for a rod antenna. Past a certain point the Q goes up because the flux is better contained. For an antenna to work, the flux can't be fully contained. Simply put, a toroid or pot core will make a very high Q inductor. Both make really lousy antennas. I think he really ment that since it is a high Q, the selected bandwidth will be narrow so keeping it tuned to the intended frequency becomes an issue. Looking at sidebands and tune a varicap should not be too hard. Not much different than tuning an OCXO to a rubidium resonance. But then again, avoid the issue and go for a black hole antenna amplifier. The benefit of a lower Q resonance is more stable phase and group-dela. Cheers, Magnus ___ 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] WWVB 60 kHz Loop Antenna Progress
On Tue, Oct 19, 2010 at 7:16 PM, Magnus Danielson mag...@rubidium.dyndns.org wrote: But then again, avoid the issue and go for a black hole antenna amplifier. I've been gathering information on Black Hole Antennas for a while on my web site: http://www.unusualresearch.com/Sutton/sutton.htm Anyone come across anything new? Always did want to try one for 60 kHz. -- http://blog.softwaresafety.net/ http://www.designer-iii.com/ http://www.wearablesmartsensors.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] WWVB 60 kHz Loop Antenna Progress
As I understand it, 60 KHz information is so slow that phase information is critical. Why would anybody use a resonant antenna in that situation? The phase shift from day to night is more than enough to work around. I used a non-resonant antenna proposed by John Ackermann against Z3801 outputs and got decent results, but not like comparing the Z3801 outputs against a Cs standard. John's antenna should be in the archives. Just 100 feet of RG-58 wound on a 4 foot diagonal PVC pipe frame, with the shield split at 50 feet, IIRC. Tried resonating it, got unstable results. If you really must work with WWVB, I have a Spectracom 60KHz receiver and extras in a Tektronix rack or a Fluke 207 for sale at moving sale prices. I never thought there'd be any interest. Bill Hawkins -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Bob Paddock Sent: Tuesday, October 19, 2010 7:10 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] WWVB 60 kHz Loop Antenna Progress On Tue, Oct 19, 2010 at 7:16 PM, Magnus Danielson mag...@rubidium.dyndns.org wrote: But then again, avoid the issue and go for a black hole antenna amplifier. I've been gathering information on Black Hole Antennas for a while on my web site: http://www.unusualresearch.com/Sutton/sutton.htm Anyone come across anything new? Always did want to try one for 60 kHz. -- http://blog.softwaresafety.net/ http://www.designer-iii.com/ http://www.wearablesmartsensors.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] WWVB 60 kHz Loop Antenna Progress
Bill what are you asking on the spectracom and model number please? Regards Paul. On Tue, Oct 19, 2010 at 10:14 PM, Bill Hawkins b...@iaxs.net wrote: As I understand it, 60 KHz information is so slow that phase information is critical. Why would anybody use a resonant antenna in that situation? The phase shift from day to night is more than enough to work around. I used a non-resonant antenna proposed by John Ackermann against Z3801 outputs and got decent results, but not like comparing the Z3801 outputs against a Cs standard. John's antenna should be in the archives. Just 100 feet of RG-58 wound on a 4 foot diagonal PVC pipe frame, with the shield split at 50 feet, IIRC. Tried resonating it, got unstable results. If you really must work with WWVB, I have a Spectracom 60KHz receiver and extras in a Tektronix rack or a Fluke 207 for sale at moving sale prices. I never thought there'd be any interest. Bill Hawkins -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Bob Paddock Sent: Tuesday, October 19, 2010 7:10 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] WWVB 60 kHz Loop Antenna Progress On Tue, Oct 19, 2010 at 7:16 PM, Magnus Danielson mag...@rubidium.dyndns.org wrote: But then again, avoid the issue and go for a black hole antenna amplifier. I've been gathering information on Black Hole Antennas for a while on my web site: http://www.unusualresearch.com/Sutton/sutton.htm Anyone come across anything new? Always did want to try one for 60 kHz. -- http://blog.softwaresafety.net/ http://www.designer-iii.com/ http://www.wearablesmartsensors.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.
[time-nuts] 60KHz Antenna Cont'd
Gents, Wrote: John's antenna should be in the archives. Just 100 feet of RG-58 wound on a 4 foot diagonal PVC pipe frame, with the shield split at 50 feet, IIRC. Tried resonating it, got unstable results. snip Could you please elaborate on the construction details such as co-ax used, indoors or out, and type of tuning caps used, ect? What was the input amp used? I was planning on making that antenna but don’t want to go to all the effort for a bust. My antenna would be outside and I plan on using some RG-6. Regards, Perrier ___ 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] TestEquipTrader Cont’d
Gents, Wrote: 1. TestEquipTrader is NOT a site. It is a Yahoo Group, an email reflector, like febo. To access the files, etc. you have to join the Group: http://groups.yahoo.com/group/TestEquipTrader/join Thanks, now I know how to join it. Wrote 2. Lothar has good stuff at good prices, but is very erratic about shipping things. He also has hung out on other Yahoo Groups. He is NOT representative of the rest of the list members. He has only just re-appeared after a many month absence. I’m glad that Lothar has some redeeming qualities. Comments posted about him, were to say the least, very nasty. I’m glad but not surprised that the rest of the guys are good people, just like this group. Regards, Perrier ___ 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] Cesium standard prices
Gents, Time nut junkie that I am, I’d like to someday acquire a cesium standard. Several questions: price for a reasonably working unit. Any specific model that one should look for? What about the AS IS HP units that show up on epay? And if you get one how can you know or test it that it’s stable? TIA Regards, Perrier ___ 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] WWVB NIST Radio Time Receiver
Has anyone here bought one of these and given it a try? http://www.sparkfun.com/commerce/product_info.php?products_id=10060 Looks like it might be fun to play with... 73 Brice KA8MAV ___ 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] WWVB NIST Radio Time Receiver
Brian, As only one of the listed frequencies are usable in the US, you would do better buying an ATOMIC clock at your local Walmart for around $20. That way you also get a nice display and it includes the same basic receiver inside. BillWB6BNQ Heathkid wrote: Has anyone here bought one of these and given it a try? http://www.sparkfun.com/commerce/product_info.php?products_id=10060 Looks like it might be fun to play with... 73 Brice KA8MAV ___ 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] 60KHz Antenna Cont'd
Perrier, You may have missed some bits. The plans are in the archives, or ask John, your list manager. The coax is 1/4 in diameter but doesn't have an RG designation on the cable. I used it indoors near a window because 60 KHz isn't greatly affected by wooden construction. There is no resonating capacitor. That way lies phase angle variations with temperature. I used it with a receiver that had a 60 KHz crystal filter, no preamp. Tried a shielded loop in the attic (tinfoil and twisted bell wire) to a converted BC-454(?) TRF receiver with the IF cans resonated for 60 KHz. Was swamped by 61 KHz signal from nearby CRT monitors. My QTH is Minneapolis, MN, not that far from Fort Collins, CO. Bill Hawkins -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Perry Sandeen Sent: Tuesday, October 19, 2010 10:44 PM To: time-nuts-requ...@febo.com Subject: [time-nuts] 60KHz Antenna Cont'd Gents, Wrote: John's antenna should be in the archives. Just 100 feet of RG-58 wound on a 4 foot diagonal PVC pipe frame, with the shield split at 50 feet, IIRC. Tried resonating it, got unstable results. snip Could you please elaborate on the construction details such as co-ax used, indoors or out, and type of tuning caps used, ect? What was the input amp used? I was planning on making that antenna but don't want to go to all the effort for a bust. My antenna would be outside and I plan on using some RG-6. Regards, Perrier ___ 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] Cesium standard prices
Perrier, I have a FTS (Datum) 4040A CS standard with large foamed shipping case for $500. Yes, it works. Does not have a computer interface, but does have a C field adjustment just behind the rack ears on the left side. Paid $1200 for it in a local sale several years ago. Used it, but the power bill went up. The problem is shipping. Case has Cs warnings, but they may no longer be a problem. Bill Hawkins -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Perry Sandeen Sent: Tuesday, October 19, 2010 11:15 PM To: time-nuts-requ...@febo.com Subject: [time-nuts] Cesium standard prices Gents, Time nut junkie that I am, I'd like to someday acquire a cesium standard. Several questions: price for a reasonably working unit. Any specific model that one should look for? What about the AS IS HP units that show up on epay? And if you get one how can you know or test it that it's stable? TIA Regards, Perrier ___ 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.
