Re: [time-nuts] What size graphs do people like? (How big isyourscreen?)
-Original Message- From: Mike S Sent: Wednesday, August 08, 2012 7:24 PM [] ?? That's a page, which despite its title, contains a .png image, so the image is viewable in a browser. The eps is here: http://www.acousticscale.org/wiki/images/a/a0/SHAR_PGW_2009_Staves.eps Try opening the real eps in your browser. On both Firefox and MS Internet Explorer, that page expects a 3rd-party helper to visualise the EPS content. David -- SatSignal Software - Quality software written to your requirements Web: http://www.satsignal.eu Email: david-tay...@blueyonder.co.uk ___ 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] 10 MHz low pass filter
A little delayed, but here's a sweep to 500MHz: https://picasaweb.google.com/lh/photo/-wJRN8e2ugrxVVtMxqYI49MTjNZETYmyPJy0liipFm0?feat=directlink 1.2 dB loss at 10MHz. Something going on at 347MHz. If I get chance, I'll do a sweep to 1GHz. Orin, KJ7HQ. On Wed, Jun 20, 2012 at 4:17 PM, Thomas S. Knutsen la3...@gmail.com wrote: Based on that PCB, I want to see an sweep to at least 1GHz. The reason is that experience have shown that the inductance (perhaps 10nH) in series with C2 and C6 would damage the stop-band rejection at UHF. Used with an OXCO this would not matter, but the desire to make the ultimate filter is still there. Thomas. 2012/6/21 li...@lazygranch.com If the output is buffered, there really shouldn't be a problem. Incidentally, I can crank out high order LCR filters all day just by transforming prototypes out of Zverev. But it has been my experience at even 10MHz the parasitics of the elements will throw off the design. -Original Message- From: Bob Camp li...@rtty.us Sender: time-nuts-boun...@febo.com Date: Wed, 20 Jun 2012 17:49:37 To: Discussion of precise time and frequency measurement time-nuts@febo.com Reply-To: Discussion of precise time and frequency measurement time-nuts@febo.com Subject: Re: [time-nuts] 10 MHz low pass filter Hi That's a pretty high order filter. The output of most OCXO's already has a filter on it. Combining two filters (especially high order ones) without isolation between them is not a good idea. The resulting transfer function will not be what you expect it to be…. Bob On Jun 20, 2012, at 4:54 PM, Joseph Gray wrote: I came across this filter design recently and thought I'd build a few. http://www.jwmeng.com/AppNote/AppNote003.html I was about to place a Mouser order when I came across someone selling filters, based on the above design. http://www.ebay.com/itm/10-MHz-filter-kit-for-tcxo-gps-pll-/110893777470 The price with a board seemed low enough that I ordered a few. I'll let everyone know how they work out. Joe Gray W5JG ___ 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. -- Please avoid sending me Word or PowerPoint attachments. See http://www.gnu.org/philosophy/no-word-attachments.html PDF is an better alternative and there are always LaTeX! ___ 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] FTS 1200
I have a FTS 1200 that is off by about 2 Hz. Have decided to take a closer look. Does any one have technical Information I should study before I open it up. Thanks Bert Kehren ___ 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] FTS 1200
Depending on how long your FTS 1200 has been running you may want to wait for a few weeks or so. A new to me FTS 1050 had a similar problem that went away after a few weeks. Regards Mark Spencer --- On Thu, 8/9/12, ewkeh...@aol.com ewkeh...@aol.com wrote: From: ewkeh...@aol.com ewkeh...@aol.com Subject: [time-nuts] FTS 1200 To: time-nuts@febo.com Received: Thursday, August 9, 2012, 5:00 PM I have a FTS 1200 that is off by about 2 Hz. Have decided to take a closer look. Does any one have technical Information I should study before I open it up. Thanks Bert Kehren ___ 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] FTS 1200
Thank you will try Bert In a message dated 8/9/2012 5:54:46 P.M. Eastern Daylight Time, mspencer12...@yahoo.ca writes: Depending on how long your FTS 1200 has been running you may want to wait for a few weeks or so. A new to me FTS 1050 had a similar problem that went away after a few weeks. Regards Mark Spencer --- On Thu, 8/9/12, ewkeh...@aol.com ewkeh...@aol.com wrote: From: ewkeh...@aol.com ewkeh...@aol.com Subject: [time-nuts] FTS 1200 To: time-nuts@febo.com Received: Thursday, August 9, 2012, 5:00 PM I have a FTS 1200 that is off by about 2 Hz. Have decided to take a closer look. Does any one have technical Information I should study before I open it up. Thanks Bert Kehren ___ 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] FTS 1200
Hi Bert, I have a FTS 1200 that is off by about 2 Hz. Have decided to take a closer look. Does any one have technical Information I should study before I open it up. Thanks Bert Kehren The efc range on my FTS 1200 goes from about -1.5Hz to +2Hz (0V to +10V). Is your FTS1200 of even with max (or min) efc voltage? -- Björn ___ 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] FTS 1200
Bjoern No not able to tune it to 5 MHz. Bert In a message dated 8/9/2012 6:48:59 P.M. Eastern Daylight Time, b...@lysator.liu.se writes: Hi Bert, I have a FTS 1200 that is off by about 2 Hz. Have decided to take a closer look. Does any one have technical Information I should study before I open it up. Thanks Bert Kehren The efc range on my FTS 1200 goes from about -1.5Hz to +2Hz (0V to +10V). Is your FTS1200 of even with max (or min) efc voltage? -- Björn ___ 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] FTS 1200
Hi As the unit warms up, you should be able to tell weaner it starts off above 5 or below 5 MHz. There are enough different crystal cuts that *might* be in there that checking it at turn on is the easy approach. If it starts low and is off low, the heater may be the issue. Bob On Aug 9, 2012, at 6:53 PM, ewkeh...@aol.com wrote: Bjoern No not able to tune it to 5 MHz. Bert In a message dated 8/9/2012 6:48:59 P.M. Eastern Daylight Time, b...@lysator.liu.se writes: Hi Bert, I have a FTS 1200 that is off by about 2 Hz. Have decided to take a closer look. Does any one have technical Information I should study before I open it up. Thanks Bert Kehren The efc range on my FTS 1200 goes from about -1.5Hz to +2Hz (0V to +10V). Is your FTS1200 of even with max (or min) efc voltage? -- Björn ___ 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] FTS 1200
The unit starts high and over 20 minutes comes down to 4.975 with 0 V on the EFC. Any voltage on pin 2 and it quits oscillating. Bert In a message dated 8/9/2012 7:06:48 P.M. Eastern Daylight Time, li...@rtty.us writes: Hi As the unit warms up, you should be able to tell weaner it starts off above 5 or below 5 MHz. There are enough different crystal cuts that *might* be in there that checking it at turn on is the easy approach. If it starts low and is off low, the heater may be the issue. Bob On Aug 9, 2012, at 6:53 PM, ewkeh...@aol.com wrote: Bjoern No not able to tune it to 5 MHz. Bert In a message dated 8/9/2012 6:48:59 P.M. Eastern Daylight Time, b...@lysator.liu.se writes: Hi Bert, I have a FTS 1200 that is off by about 2 Hz. Have decided to take a closer look. Does any one have technical Information I should study before I open it up. Thanks Bert Kehren The efc range on my FTS 1200 goes from about -1.5Hz to +2Hz (0V to +10V). Is your FTS1200 of even with max (or min) efc voltage? -- Björn ___ 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 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] FTS 1200
Hi Best bet is a bad solder joint. Likely on the crystal it's self. Of course it could be on anything in series with the crystal. Bob On Aug 9, 2012, at 7:49 PM, ewkeh...@aol.com wrote: The unit starts high and over 20 minutes comes down to 4.975 with 0 V on the EFC. Any voltage on pin 2 and it quits oscillating. Bert In a message dated 8/9/2012 7:06:48 P.M. Eastern Daylight Time, li...@rtty.us writes: Hi As the unit warms up, you should be able to tell weaner it starts off above 5 or below 5 MHz. There are enough different crystal cuts that *might* be in there that checking it at turn on is the easy approach. If it starts low and is off low, the heater may be the issue. Bob On Aug 9, 2012, at 6:53 PM, ewkeh...@aol.com wrote: Bjoern No not able to tune it to 5 MHz. Bert In a message dated 8/9/2012 6:48:59 P.M. Eastern Daylight Time, b...@lysator.liu.se writes: Hi Bert, I have a FTS 1200 that is off by about 2 Hz. Have decided to take a closer look. Does any one have technical Information I should study before I open it up. Thanks Bert Kehren The efc range on my FTS 1200 goes from about -1.5Hz to +2Hz (0V to +10V). Is your FTS1200 of even with max (or min) efc voltage? -- Björn ___ 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 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] FTS 1200
Hi Bert, So the EFC does not work at all? (or did I miss something obvious?) /Björn The unit starts high and over 20 minutes comes down to 4.975 with 0 V on the EFC. Any voltage on pin 2 and it quits oscillating. Bert In a message dated 8/9/2012 7:06:48 P.M. Eastern Daylight Time, li...@rtty.us writes: Hi As the unit warms up, you should be able to tell weaner it starts off above 5 or below 5 MHz. There are enough different crystal cuts that *might* be in there that checking it at turn on is the easy approach. If it starts low and is off low, the heater may be the issue. Bob On Aug 9, 2012, at 6:53 PM, ewkeh...@aol.com wrote: Bjoern No not able to tune it to 5 MHz. Bert In a message dated 8/9/2012 6:48:59 P.M. Eastern Daylight Time, b...@lysator.liu.se writes: Hi Bert, I have a FTS 1200 that is off by about 2 Hz. Have decided to take a closer look. Does any one have technical Information I should study before I open it up. Thanks Bert Kehren The efc range on my FTS 1200 goes from about -1.5Hz to +2Hz (0V to +10V). Is your FTS1200 of even with max (or min) efc voltage? -- Björn ___ 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 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] FTS 1200
Bjoern No EFC. The moment I even put a small Voltage like 0.9 V through a 33 K resistor on pin 2 it quits oscillating. Bert In a message dated 8/9/2012 8:07:24 P.M. Eastern Daylight Time, b...@lysator.liu.se writes: Hi Bert, So the EFC does not work at all? (or did I miss something obvious?) /Björn The unit starts high and over 20 minutes comes down to 4.975 with 0 V on the EFC. Any voltage on pin 2 and it quits oscillating. Bert In a message dated 8/9/2012 7:06:48 P.M. Eastern Daylight Time, li...@rtty.us writes: Hi As the unit warms up, you should be able to tell weaner it starts off above 5 or below 5 MHz. There are enough different crystal cuts that *might* be in there that checking it at turn on is the easy approach. If it starts low and is off low, the heater may be the issue. Bob On Aug 9, 2012, at 6:53 PM, ewkeh...@aol.com wrote: Bjoern No not able to tune it to 5 MHz. Bert In a message dated 8/9/2012 6:48:59 P.M. Eastern Daylight Time, b...@lysator.liu.se writes: Hi Bert, I have a FTS 1200 that is off by about 2 Hz. Have decided to take a closer look. Does any one have technical Information I should study before I open it up. Thanks Bert Kehren The efc range on my FTS 1200 goes from about -1.5Hz to +2Hz (0V to +10V). Is your FTS1200 of even with max (or min) efc voltage? -- Björn ___ 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 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] FTS 1200
Hi Bert, My guess would be a bad (shorted maybe?) Varicap. Does it go out of oscillation if you just ground the efc pin ? BillWB6BNQ ewkeh...@aol.com wrote: Bjoern No EFC. The moment I even put a small Voltage like 0.9 V through a 33 K resistor on pin 2 it quits oscillating. Bert In a message dated 8/9/2012 8:07:24 P.M. Eastern Daylight Time, b...@lysator.liu.se writes: Hi Bert, So the EFC does not work at all? (or did I miss something obvious?) /Björn The unit starts high and over 20 minutes comes down to 4.975 with 0 V on the EFC. Any voltage on pin 2 and it quits oscillating. Bert In a message dated 8/9/2012 7:06:48 P.M. Eastern Daylight Time, li...@rtty.us writes: Hi As the unit warms up, you should be able to tell weaner it starts off above 5 or below 5 MHz. There are enough different crystal cuts that *might* be in there that checking it at turn on is the easy approach. If it starts low and is off low, the heater may be the issue. Bob On Aug 9, 2012, at 6:53 PM, ewkeh...@aol.com wrote: Bjoern No not able to tune it to 5 MHz. Bert In a message dated 8/9/2012 6:48:59 P.M. Eastern Daylight Time, b...@lysator.liu.se writes: Hi Bert, I have a FTS 1200 that is off by about 2 Hz. Have decided to take a closer look. Does any one have technical Information I should study before I open it up. Thanks Bert Kehren The efc range on my FTS 1200 goes from about -1.5Hz to +2Hz (0V to +10V). Is your FTS1200 of even with max (or min) efc voltage? -- Björn ___ 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 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 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] FTS 1200
In a message dated 8/9/2012 8:07:24 P.M. Eastern Daylight Time, b...@lysator.liu.se writes: Hi Bert, So the EFC does not work at all? (or did I miss something obvious?) /Björn The unit starts high and over 20 minutes comes down to 4.975 with 0 V on the EFC. Any voltage on pin 2 and it quits oscillating. Bert What happens to the current drain as the unit warms up? Does it fall off after 5-10 minutes as expected? If not, it sounds like the oven controller may be stuck on, overheating the crystal. I'd look into that possibility sooner rather than later. -- john, KE5FX www.miles.io ___ 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] FTS 1200
Bill Grounded pin, works and stays on frequency. Bert In a message dated 8/9/2012 8:29:08 P.M. Eastern Daylight Time, wb6...@cox.net writes: Hi Bert, My guess would be a bad (shorted maybe?) Varicap. Does it go out of oscillation if you just ground the efc pin ? BillWB6BNQ ewkeh...@aol.com wrote: Bjoern No EFC. The moment I even put a small Voltage like 0.9 V through a 33 K resistor on pin 2 it quits oscillating. Bert In a message dated 8/9/2012 8:07:24 P.M. Eastern Daylight Time, b...@lysator.liu.se writes: Hi Bert, So the EFC does not work at all? (or did I miss something obvious?) /Björn The unit starts high and over 20 minutes comes down to 4.975 with 0 V on the EFC. Any voltage on pin 2 and it quits oscillating. Bert In a message dated 8/9/2012 7:06:48 P.M. Eastern Daylight Time, li...@rtty.us writes: Hi As the unit warms up, you should be able to tell weaner it starts off above 5 or below 5 MHz. There are enough different crystal cuts that *might* be in there that checking it at turn on is the easy approach. If it starts low and is off low, the heater may be the issue. Bob On Aug 9, 2012, at 6:53 PM, ewkeh...@aol.com wrote: Bjoern No not able to tune it to 5 MHz. Bert In a message dated 8/9/2012 6:48:59 P.M. Eastern Daylight Time, b...@lysator.liu.se writes: Hi Bert, I have a FTS 1200 that is off by about 2 Hz.Have decided to take a closer look. Does any one have technical Information I should study before I open it up. Thanks Bert Kehren The efc range on my FTS 1200 goes from about -1.5Hz to +2Hz (0V to +10V). Is your FTS1200 of even with max (or min) efc voltage? -- Björn ___ 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 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 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] FTS 1200
John Oven did reduce in current and I can not imagine that it would be that close with an overheated oven. At 0 V it is within .5 Hz of what they normally are. Ground has no effect but even 0.8 V on pin 2 stops oscillation Once it stops it takes about 10 seconds to continue oscillation, about 0.1 Hz higher and within an other 10 seconds is within 2 E-10 back to the previous value. Bert In a message dated 8/9/2012 8:58:36 P.M. Eastern Daylight Time, jmi...@pop.net writes: In a message dated 8/9/2012 8:07:24 P.M. Eastern Daylight Time, b...@lysator.liu.se writes: Hi Bert, So the EFC does not work at all? (or did I miss something obvious?) /Björn The unit starts high and over 20 minutes comes down to 4.975 with 0 V on the EFC. Any voltage on pin 2 and it quits oscillating. Bert What happens to the current drain as the unit warms up? Does it fall off after 5-10 minutes as expected? If not, it sounds like the oven controller may be stuck on, overheating the crystal. I'd look into that possibility sooner rather than later. -- john, KE5FX www.miles.io ___ 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] FTS 1200
John Oven did reduce in current and I can not imagine that it would be that close with an overheated oven. At 0 V it is within .5 Hz of what they normally are. Ground has no effect but even 0.8 V on pin 2 stops oscillation That's a suspicious-sounding voltage. Are you sure you're not forward-biasing the varicap? Maybe some of these OCXOs were specified for use with negative EFC voltage. If so, then driving the diode with a negative voltage should raise the operating frequency (which is what you want.) -- john, KE5FX www.miles.io ___ 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] FTS 1200
John, that did the trick I can tune it with a negative voltage, minus 13 gives me plus 2 Hz but this unit came out of a FTS 5000 and it had a positive tuning voltage. Bert In a message dated 8/9/2012 9:13:29 P.M. Eastern Daylight Time, jmi...@pop.net writes: John Oven did reduce in current and I can not imagine that it would be that close with an overheated oven. At 0 V it is within .5 Hz of what they normally are. Ground has no effect but even 0.8 V on pin 2 stops oscillation That's a suspicious-sounding voltage. Are you sure you're not forward-biasing the varicap? Maybe some of these OCXOs were specified for use with negative EFC voltage. If so, then driving the diode with a negative voltage should raise the operating frequency (which is what you want.) -- john, KE5FX www.miles.io ___ 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] FTS 1200
John Thanks again I am calling it a night. Will let it soak over night and continue tests in the morning. Does any one have the oscillator circuit. With the connector on the bottom left to the right id something that looks like an adjustment screw,flat round flush with the surface and a screwdriver slot. Will not touch it unless I know what it is. Thanks againBert Kehren Miami In a message dated 8/9/2012 8:58:36 P.M. Eastern Daylight Time, jmi...@pop.net writes: In a message dated 8/9/2012 8:07:24 P.M. Eastern Daylight Time, b...@lysator.liu.se writes: Hi Bert, So the EFC does not work at all? (or did I miss something obvious?) /Björn The unit starts high and over 20 minutes comes down to 4.975 with 0 V on the EFC. Any voltage on pin 2 and it quits oscillating. Bert What happens to the current drain as the unit warms up? Does it fall off after 5-10 minutes as expected? If not, it sounds like the oven controller may be stuck on, overheating the crystal. I'd look into that possibility sooner rather than later. -- john, KE5FX www.miles.io ___ 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] Cross-Correlation Results
Hi, Page has the pictures using percentage for width and height parameter and that makes it quite dependent on the browser and window size and aspect ratio. It is really odd to have it that way. John (N8UR), you have: IMG SRC=cross-correlation-pn.png WIDTH=50% HEIGHT=50% you may go there and replace the line above by: a href=cross-correlation-pn.png img src=cross-correlation-pn.png height=200/a and it will be great looking for sure. Nice small picture, and clickable to zoom it. Luis Cupido. ct1dmk. On 8/5/2012 12:30 AM, John Miles wrote: It makes them look oddly squashed unless the browser window proportions happen to be just right.) ___ 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] Cross-Correlation Results
You don't really need that John, let your good resolution intact (it won't be a big sized image anyway) and just use the height parameter to size it as you like but in fixed nr of pixels like I suggested before to John(n8ur). It works much better and no need for editing, furthermore the way I suggested if one really wants to see it all zoomed up just click on it. lc. ct1dmk. On 8/5/2012 1:23 PM, John Miles wrote: What I always do is just resize the TimeLab window to be legible, then post the img src link without any extra scaling. ___ 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.
