Re: [time-nuts] sine to square wave converter
The Achilles heel of that biasing technique is that the emitter currents of the pair of pnp's is affected by the noise on the 20V supply. The 20V supply noise is only attenuated by a factor of 5 or so when both transistors have equal collector currents. I have both an LTC evaluation board for the LTC6957 and a Holzworth sine to CMOS converter as well as a Timepod so I could measure the phase noise of both of these for various 10MHz input signal levels. Bruce On July 10, 2014 at 8:21 PM Charles Steinmetz csteinm...@yandex.com wrote: Bruce wrote: Currently Linear Technology's sine to square wave devices with selectable filtering (LTC6957 series) are better in that they are a closer approximation to the ideal zero crossing detector. Failing that the next best is perhaps an AC coupled (both at input and between emitters) differential pair of 2N3906's or similar. My initial results with the LTC6957 did not produce lower phase noise at 10MHz than an optimized Wenzel two-PNP circuit (it may be possible to do better than my initial experiments with the 6957). Here is the circuit I use: Emacs! Using a 20v supply reduces the input feedthrough due to Q1's B-E capacitance, which tends to give the output square wave a sloping top. Using MPSH81s rather than 2N3906s helps with feedthrough, also, as well as reducing the rise and fall times (both about 2-4 nS with this circuit, depending on how hard it is driven, if it is built with proper attention to layout and stray capacitance). Some will insist that the LM329 is overkill, but the base bias can be a significant source (even the dominant source) of phase noise/jitter. The stability and low noise of the 329 improve performance materially -- even a TL431 or 1N829 is measurably inferior. An LM399 is somewhat better than the 329, but I have not found it necessary in practice. (Note that the pullup resistor is not shown -- 1.5k to 10k metal film from the 329 to +20v, not critical.) Some additional improvement can be achieved by using the PNP devices in an HFA3096 or HFA3128 array, but I have generally not seen the need for this in practic. As drawn, this circuit has lower residual PN than any 10MHz oscillator I have measured. Works best with input levels from 1 to 10Vpp (350mV to 3.5Vrms sine wave). There is a small duty cycle asymmetry (high longer than low), which depends on drive level. Using faster devices (such as HFA3096 or HFA3128) reduces the asymmetry. If this is a problem, a resistor can be added from the base of Q1 to ground to trim out the asymmetry if the input level is well controlled. Otherwise, the mean output voltage can be detected, compared to a reference, and used to adjust either base voltage with a servo loop. Best regards, Charles ___ 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] sine to square wave converter
Bruce, please make those tests it will help me to how to proceed and probably many other time nuts. Bert Kehren In a message dated 7/11/2014 3:50:36 A.M. Eastern Daylight Time, br...@ko4bb.com writes: The Achilles heel of that biasing technique is that the emitter currents of the pair of pnp's is affected by the noise on the 20V supply. The 20V supply noise is only attenuated by a factor of 5 or so when both transistors have equal collector currents. I have both an LTC evaluation board for the LTC6957 and a Holzworth sine to CMOS converter as well as a Timepod so I could measure the phase noise of both of these for various 10MHz input signal levels. Bruce On July 10, 2014 at 8:21 PM Charles Steinmetz csteinm...@yandex.com wrote: Bruce wrote: Currently Linear Technology's sine to square wave devices with selectable filtering (LTC6957 series) are better in that they are a closer approximation to the ideal zero crossing detector. Failing that the next best is perhaps an AC coupled (both at input and between emitters) differential pair of 2N3906's or similar. My initial results with the LTC6957 did not produce lower phase noise at 10MHz than an optimized Wenzel two-PNP circuit (it may be possible to do better than my initial experiments with the 6957). Here is the circuit I use: Emacs! Using a 20v supply reduces the input feedthrough due to Q1's B-E capacitance, which tends to give the output square wave a sloping top. Using MPSH81s rather than 2N3906s helps with feedthrough, also, as well as reducing the rise and fall times (both about 2-4 nS with this circuit, depending on how hard it is driven, if it is built with proper attention to layout and stray capacitance). Some will insist that the LM329 is overkill, but the base bias can be a significant source (even the dominant source) of phase noise/jitter. The stability and low noise of the 329 improve performance materially -- even a TL431 or 1N829 is measurably inferior. An LM399 is somewhat better than the 329, but I have not found it necessary in practice. (Note that the pullup resistor is not shown -- 1.5k to 10k metal film from the 329 to +20v, not critical.) Some additional improvement can be achieved by using the PNP devices in an HFA3096 or HFA3128 array, but I have generally not seen the need for this in practic. As drawn, this circuit has lower residual PN than any 10MHz oscillator I have measured. Works best with input levels from 1 to 10Vpp (350mV to 3.5Vrms sine wave). There is a small duty cycle asymmetry (high longer than low), which depends on drive level. Using faster devices (such as HFA3096 or HFA3128) reduces the asymmetry. If this is a problem, a resistor can be added from the base of Q1 to ground to trim out the asymmetry if the input level is well controlled. Otherwise, the mean output voltage can be detected, compared to a reference, and used to adjust either base voltage with a servo loop. Best regards, Charles ___ 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] HP3336B S/N Question
Are you sure? According to my 1982-1986 catalogs, the combination of a HP3586A/B, HP85 and an optional HP3336A/B is called a HP3046A/B. In 1980 there was a HP3040A which was a network analyzer that used the HP3330A/B synthesizer and the HP3570A/B selective level meter... with no computer. Perhaps the HP3040L was the same thing but with a HP3336A/B instead? I'm missing the 1981 catalog where it may have appeared. -Chuck Harris Flemming Larsen wrote: The HP 3040L was a combination of the HP3586x Selective Level Voltmeter and the HP3336x Tracking Signal Generator. It came with interconnecting cables and software and a programming manual for the HP-Basic software. WECO connectors and adapters are available from: www.milestek.com -- FL ___ 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] HP3336B S/N Question
I just noticed that we are conducting this on time-nuts. Since this has nothing to do with time, perhaps we should move this thread to the HP/Agilent group? hp_agilent_equipm...@yahoogroups.com -Chuck Harris Chuck Harris wrote: Are you sure? According to my 1982-1986 catalogs, the combination of a HP3586A/B, HP85 and an optional HP3336A/B is called a HP3046A/B. In 1980 there was a HP3040A which was a network analyzer that used the HP3330A/B synthesizer and the HP3570A/B selective level meter... with no computer. Perhaps the HP3040L was the same thing but with a HP3336A/B instead? I'm missing the 1981 catalog where it may have appeared. -Chuck Harris ___ 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] Wanted: Ace III gps receiver for Datum TS 2100
What commands were you trying to send that you got gps engine busy??? IIRC, some of the commands never got implemented. I'll fire one of mine up today and experiment with it to see what kind of output I get when it's not tracking anything and such. If the clone receiver is crazy expensive, contact me off-list, I might have an ACE-II or ACE-III receiver I can find for you. A while back I even tried an old SveeSix receiver and those work too in the TS2100. Sorry if I was muddy. The TS 2100 had an ace gps receiver installed. The antenna and tracking lights went out a week ago. Just got round to checking what was the matter. The symptom is that the gps engine always reports busy when checked via the front panel interface. One of the list members pointed me at a clone of the ACE II/III. It's a new (as opposed to surplus) product, using the Trimble Copernicus chipset. I sent them an email. Norm n3ykf ___ 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] FASTTRAX GPS Antenna power
On 7/10/2014 10:02 PM, Bob Stewart wrote: I'm a bit confused about what you're asking. You discuss antennas but you show pictures of a GPS receiver. They're not the same thing. I use a puck antenna. They cost about $6 on ebay, and take their power from the coax. Normally your GPS receiver supplies power to the coax, so you don't have to do anything special, other than don't short it out. Bob Read the page at the bottom. Tom showed supplying power to the GPS unit for Primary and Secondary power. The Antenna power supply pin is not mentioned. I have a puck antenna, which needs power, and I'm just asking if anyone has an opinion about whether this particular unit may supply the power w/o connecting pin 1. W/o the page to reference that you would not have the thing that is confusing me. So, does this unit have some option that supplies the power to the antenna, or do I need to run the power to the antenna thru pin 1? And can I hook up the same +3.3 to all three supply pins? Or should I hook up a separate antenna supply, and assume the ground for that supply is the pin 8? Jim From: jim s jwsm...@jwsss.com To: time-nuts@febo.com Sent: Thursday, July 10, 2014 11:49 PM Subject: [time-nuts] FASTTRAX GPS Antenna power I disobeyed the group suggestions about antennas, and bought one of the one which needs power. I had asked whether I should apply 5 volts to the. tom posted on his fine info page a pinout, which I'm going to use. Pin 1 is 3-5.5VDC Antenna power input. Pin 2 is Prime Power input pin 4 is Backup Power input. Pin 8 is GND I am going to apply 3.3 to 1,2, and 4. Just wanted to get an opinion before trying it. I'm curious if somehow the suggested Primary and Backup power was all that was needed, or how you guys were getting your GPS signals in. Are your antennas not powered? thanks Jim http://leapsecond.com/pages/itrax/ ___ 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] Anyone having a problem getting Bulletin B from maia.usno.navy.mil?
Looks like my problem is back: /usr/local/bin/wget -O /tmp/finals-all http://maia.usno.navy.mil/ser7/finals.all 2 /dev/null gets --2014-07-11 15:35:27-- http://maia.usno.navy.mil/ser7/finals.all Resolving maia.usno.navy.mil (maia.usno.navy.mil)... 199.211.133.23 Connecting to maia.usno.navy.mil (maia.usno.navy.mil)|199.211.133.23|:80... failed: Operation timed out. Retrying. --2014-07-11 15:36:51-- (try: 2) http://maia.usno.navy.mil/ser7/finals.all Connecting to maia.usno.navy.mil (maia.usno.navy.mil)|199.211.133.23|:80... failed: Operation timed out. Retrying. The finals.all data does not seem to be available from iers, but just through usno. I use is to create graphs of UTC-UT1 delta. I was looking today as I wanted to add to my graph the difference between the observed and predicted values since the records started. Unfortunately it did not occur to me to backup the source data. Le 9 juil. 2014 à 15:15, mike cook a écrit : Works for me too now.. I thought that maybe .mil was under a DOS attack. Thanks for the second source. Le 9 juil. 2014 à 14:30, Brian Inglis a écrit : On 2014-07-09 01:30, mike cook wrote: times out. Can I get it from anywhere else? http://maia.usno.navy.mil/ser7/bulb.dat works for me - the original is at ftp://hpiers.obspm.fr/iers/bul/bulb_new/bulletinb.dat -- Take care. Thanks, Brian Inglis ___ 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] sine to square wave converter
Bruce wrote: The Achilles heel of that biasing technique is that the emitter currents of the pair of pnp's is affected by the noise on the 20V supply. Yes, you do need a quiet supply -- I suppose I should have mentioned that. But sufficiently quiet supplies are not hard to design, they're just more complex than the has to be done with just one ten-cent part crowd wants (don't expect to use integrated regulators of any description). Bruce -- do you know the topology of the Holzworth converter? Best regards, Charles ___ 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] Wanted: Ace III gps receiver for Datum TS 2100
Jason, The antenna and gps lights were out on the front panel. I didn't play with the gps at all. The various messages that can be displayed from the front panel told me that gps engine busy. I just sent a payment to the manufacturer of the replacement units. Too bad you didn't get me an hour earlier. Oh well. Norm On Fri, Jul 11, 2014 at 9:05 AM, Jason Rabel ja...@extremeoverclocking.com wrote: What commands were you trying to send that you got gps engine busy??? IIRC, some of the commands never got implemented. I'll fire one of mine up today and experiment with it to see what kind of output I get when it's not tracking anything and such. If the clone receiver is crazy expensive, contact me off-list, I might have an ACE-II or ACE-III receiver I can find for you. A while back I even tried an old SveeSix receiver and those work too in the TS2100. Sorry if I was muddy. The TS 2100 had an ace gps receiver installed. The antenna and tracking lights went out a week ago. Just got round to checking what was the matter. The symptom is that the gps engine always reports busy when checked via the front panel interface. One of the list members pointed me at a clone of the ACE II/III. It's a new (as opposed to surplus) product, using the Trimble Copernicus chipset. I sent them an email. Norm n3ykf ___ 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] Anyone having a problem getting Bulletin B from maia.usno.navy.mil?
Mike, I also have had occasional trouble with usno.navy.mil the past year. It always works in the end, but sometimes I have to try more than once, or a different ISP or a different browser or a different computer/os. Note also there are times when wget fails but Chrome works perfectly (just SaveAs the text file). I have not spent time debugging the strange issue. You can also try different URL's, such as: ftp://maia.usno.navy.mil/ser7/finals.all http://toshi.nofs.navy.mil/ser7/finals.all Another idea is to click *through* http://toshi.nofs.navy.mil/ to get the file(s) you want, rather than a *direct* wget. Last idea is to get your raw data from a non .mil site. Try http://hpiers.obspm.fr/eop-pc/ and click on the earth orientation data tab. If you completely give up, I can send you the UT1 data myself. /tvb - Original Message - From: mike cook michael.c...@sfr.fr To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Friday, July 11, 2014 6:54 AM Subject: Re: [time-nuts] Anyone having a problem getting Bulletin B from maia.usno.navy.mil? Looks like my problem is back: /usr/local/bin/wget -O /tmp/finals-all http://maia.usno.navy.mil/ser7/finals.all 2 /dev/null gets --2014-07-11 15:35:27-- http://maia.usno.navy.mil/ser7/finals.all Resolving maia.usno.navy.mil (maia.usno.navy.mil)... 199.211.133.23 Connecting to maia.usno.navy.mil (maia.usno.navy.mil)|199.211.133.23|:80... failed: Operation timed out. Retrying. --2014-07-11 15:36:51-- (try: 2) http://maia.usno.navy.mil/ser7/finals.all Connecting to maia.usno.navy.mil (maia.usno.navy.mil)|199.211.133.23|:80... failed: Operation timed out. Retrying. The finals.all data does not seem to be available from iers, but just through usno. I use is to create graphs of UTC-UT1 delta. I was looking today as I wanted to add to my graph the difference between the observed and predicted values since the records started. Unfortunately it did not occur to me to backup the source data. Le 9 juil. 2014 à 15:15, mike cook a écrit : Works for me too now.. I thought that maybe .mil was under a DOS attack. Thanks for the second source. Le 9 juil. 2014 à 14:30, Brian Inglis a écrit : On 2014-07-09 01:30, mike cook wrote: times out. Can I get it from anywhere else? http://maia.usno.navy.mil/ser7/bulb.dat works for me - the original is at ftp://hpiers.obspm.fr/iers/bul/bulb_new/bulletinb.dat -- Take care. Thanks, Brian Inglis ___ 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] Anyone having a problem getting Bulletin B from maia.usno.navy.mil?
In /tmp I issued the command: wget -O /tmp/finals-all http://maia.usno.navy.mil/ser7/finals.all I got a large file, wc prints 15588 346141 2930544 finals-all I am running a pre-alpha Fedora 21. On 07/11/2014 06:54 AM, mike cook wrote: Looks like my problem is back: /usr/local/bin/wget -O /tmp/finals-all http://maia.usno.navy.mil/ser7/finals.all 2 /dev/null gets --2014-07-11 15:35:27-- http://maia.usno.navy.mil/ser7/finals.all Resolving maia.usno.navy.mil (maia.usno.navy.mil)... 199.211.133.23 Connecting to maia.usno.navy.mil (maia.usno.navy.mil)|199.211.133.23|:80... failed: Operation timed out. Retrying. --2014-07-11 15:36:51-- (try: 2) http://maia.usno.navy.mil/ser7/finals.all Connecting to maia.usno.navy.mil (maia.usno.navy.mil)|199.211.133.23|:80... failed: Operation timed out. Retrying. The finals.all data does not seem to be available from iers, but just through usno. I use is to create graphs of UTC-UT1 delta. I was looking today as I wanted to add to my graph the difference between the observed and predicted values since the records started. Unfortunately it did not occur to me to backup the source data. Le 9 juil. 2014 à 15:15, mike cook a écrit : Works for me too now.. I thought that maybe .mil was under a DOS attack. Thanks for the second source. Le 9 juil. 2014 à 14:30, Brian Inglis a écrit : On 2014-07-09 01:30, mike cook wrote: times out. Can I get it from anywhere else? http://maia.usno.navy.mil/ser7/bulb.dat works for me - the original is at ftp://hpiers.obspm.fr/iers/bul/bulb_new/bulletinb.dat -- Take care. Thanks, Brian Inglis ___ 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. -- Chuck Forsberg WA7KGX 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.
Re: [time-nuts] WWVB remod instant cheap clock receiver
Do you have a model number or can you send me a picture ? Have to do a Costco run this weekend -pete On Fri, Jul 11, 2014 at 9:16 AM, paul swed paulsw...@gmail.com wrote: OK its been a bit hard finding the little wwvb receiver kits the last few years. While in costco for sub $18 Lacrosse sells a multi color LCD clock. Wel you just know what happened next. The clock as a wwvb receiver works great however if you read the reviews there is a issue with the battery backup. It doesn't work. Mine does so who knows and I don't really care. There is a clock module in the unit and it works nicely. See attached pix V = 3V in P2 = control ground=on T = data high=low carrier compatible with the remod as is no inverter needed. G = ground To get inside to recover the module. Remove the glass screen its stuck on. Gently pry off. There are 4 screws one in each corner. You could simply tap the module out and use it or feed the data back into the clock. Lots of options. But my only goal is a source of clock modules for time-nuts that does not require a microscope to solder. By keeping the loopstick you can wrap 10 turns of wire around the end and feed a larger active antenna to it as a tuned stage. Regards Paul WB8TSL ___ 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 remod instant cheap clock receiver
Intended to add the model number. Cosco only has one type a c89201 On Fri, Jul 11, 2014 at 12:41 PM, Pete Lancashire p...@petelancashire.com wrote: Do you have a model number or can you send me a picture ? Have to do a Costco run this weekend -pete On Fri, Jul 11, 2014 at 9:16 AM, paul swed paulsw...@gmail.com wrote: OK its been a bit hard finding the little wwvb receiver kits the last few years. While in costco for sub $18 Lacrosse sells a multi color LCD clock. Wel you just know what happened next. The clock as a wwvb receiver works great however if you read the reviews there is a issue with the battery backup. It doesn't work. Mine does so who knows and I don't really care. There is a clock module in the unit and it works nicely. See attached pix V = 3V in P2 = control ground=on T = data high=low carrier compatible with the remod as is no inverter needed. G = ground To get inside to recover the module. Remove the glass screen its stuck on. Gently pry off. There are 4 screws one in each corner. You could simply tap the module out and use it or feed the data back into the clock. Lots of options. But my only goal is a source of clock modules for time-nuts that does not require a microscope to solder. By keeping the loopstick you can wrap 10 turns of wire around the end and feed a larger active antenna to it as a tuned stage. Regards Paul WB8TSL ___ 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] Wanted: Ace III gps receiver for Datum TS 2100
ja...@extremeoverclocking.com said: A while back I even tried an old SveeSix receiver and those work too in the TS2100. I have a couple of SveeSixs in case anybody ever needs one. -- These are my opinions. I hate spam. ___ 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] Time-nuts question on message size??? 119KB vs 165KB
Trying to keep the message and attachements below the 128KB limit. I send a 119KB message and it gets held as a 165KB message. Can someone help me to understand the difference please? Thanks Paul WB8TSL ___ 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] Time-nuts question on message size??? 119KB vs 165KB
paulsw...@gmail.com said: Trying to keep the message and attachements below the 128KB limit. I send a 119KB message and it gets held as a 165KB message. Can someone help me to understand the difference please? My guess would be base64 encoding? For binary files, you only get 6 bits per (text) byte rather than all 8. -- These are my opinions. I hate spam. ___ 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] Time-nuts question on message size??? 119KB vs 165KB
Thanks Hal Yes I sent the same email to my business account and could see it was 148KB. Gmail does not give you email size cause they sell storage. So they make it hard to manage your folders and the sizes. I did use thunderbird for a bit and may need to go back to that. It did however tend to clear stuff out I did not want deleted. Need to re-explore it. Regards Paul. On Fri, Jul 11, 2014 at 1:43 PM, Hal Murray hmur...@megapathdsl.net wrote: paulsw...@gmail.com said: Trying to keep the message and attachements below the 128KB limit. I send a 119KB message and it gets held as a 165KB message. Can someone help me to understand the difference please? My guess would be base64 encoding? For binary files, you only get 6 bits per (text) byte rather than all 8. -- These are my opinions. I hate spam. ___ 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] Time-nuts question on message size??? 119KB vs 165KB
Paul, Your expectation works for text attachments. But binary attachments (e.g., jpg) expand about 33%. That's 8/6, or log2(256)/log2(64), due to base64 encoding of 8-bit bytes. In general, large attachments on this list are ok. It's just that when they are above 128k they are temporarily held for manual review. I let most of them go through with little delay. /tvb (i5s) On Jul 11, 2014, at 9:21 AM, paul swed paulsw...@gmail.com wrote: Trying to keep the message and attachements below the 128KB limit. I send a 119KB message and it gets held as a 165KB message. Can someone help me to understand the difference please? Thanks Paul WB8TSL ___ 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] Time-nuts question on message size??? 119KB vs 165KB
Hi There are *some* mail outfits that will reject anything over 64K bytes. I have not had to deal with any for a while, but they are still out there. How they continue to operate with those sort of limits, I have no idea. Bob On Jul 11, 2014, at 3:49 PM, Tom Van Baak (lab) t...@leapsecond.com wrote: Paul, Your expectation works for text attachments. But binary attachments (e.g., jpg) expand about 33%. That's 8/6, or log2(256)/log2(64), due to base64 encoding of 8-bit bytes. In general, large attachments on this list are ok. It's just that when they are above 128k they are temporarily held for manual review. I let most of them go through with little delay. /tvb (i5s) On Jul 11, 2014, at 9:21 AM, paul swed paulsw...@gmail.com wrote: Trying to keep the message and attachements below the 128KB limit. I send a 119KB message and it gets held as a 165KB message. Can someone help me to understand the difference please? Thanks Paul WB8TSL ___ 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] Time-nuts question on message size??? 119KB vs 165KB
Thanks Tom and Hal I was trying to understand what the change was and now I know the pix get bigger. I will keep that in mind for the future. Regards Paul. On Fri, Jul 11, 2014 at 3:49 PM, Tom Van Baak (lab) t...@leapsecond.com wrote: Paul, Your expectation works for text attachments. But binary attachments (e.g., jpg) expand about 33%. That's 8/6, or log2(256)/log2(64), due to base64 encoding of 8-bit bytes. In general, large attachments on this list are ok. It's just that when they are above 128k they are temporarily held for manual review. I let most of them go through with little delay. /tvb (i5s) On Jul 11, 2014, at 9:21 AM, paul swed paulsw...@gmail.com wrote: Trying to keep the message and attachements below the 128KB limit. I send a 119KB message and it gets held as a 165KB message. Can someone help me to understand the difference please? Thanks Paul WB8TSL ___ 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] Anyone having a problem getting Bulletin B from maia.usno.navy.mil?
On 2014-07-11 07:54, mike cook wrote: Looks like my problem is back: /usr/local/bin/wget -O /tmp/finals-all http://maia.usno.navy.mil/ser7/finals.all 2 /dev/null gets --2014-07-11 15:35:27-- http://maia.usno.navy.mil/ser7/finals.all Resolving maia.usno.navy.mil (maia.usno.navy.mil)... 199.211.133.23 Connecting to maia.usno.navy.mil (maia.usno.navy.mil)|199.211.133.23|:80... failed: Operation timed out. Retrying. --2014-07-11 15:36:51-- (try: 2) http://maia.usno.navy.mil/ser7/finals.all Connecting to maia.usno.navy.mil (maia.usno.navy.mil)|199.211.133.23|:80... failed: Operation timed out. Retrying. Still no problems on primary maia (from outside US) but backup toshi not available right now. See note on http://maia.usno.navy.mil page about getusnoeop.ksh script and README. Customize and schedule to get your products from primary or backup servers as soon as they are posted (after 17.10UTC). The finals.all data does not seem to be available from iers, but just through usno. I use is to create graphs of UTC-UT1 delta. I was looking today as I wanted to add to my graph the difference between the observed and predicted values since the records started. Bulletin A is a USNO only product. IERS EOP PC data products are produced only weekly or end one month ago. Unfortunately it did not occur to me to backup the source data. I believe the above script may keep some backups. -- Take care. Thanks, Brian Inglis ___ 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] Anyone having a problem getting Bulletin B from maia.usno.navy.mil?
Thanks Brian, Surprise, surprise I can get access this morning. Le 12 juil. 2014 à 05:02, Brian Inglis a écrit : On 2014-07-11 07:54, mike cook wrote: Looks like my problem is back: /usr/local/bin/wget -O /tmp/finals-all http://maia.usno.navy.mil/ser7/finals.all 2 /dev/null gets --2014-07-11 15:35:27-- http://maia.usno.navy.mil/ser7/finals.all Resolving maia.usno.navy.mil (maia.usno.navy.mil)... 199.211.133.23 Connecting to maia.usno.navy.mil (maia.usno.navy.mil)|199.211.133.23|:80... failed: Operation timed out. Retrying. --2014-07-11 15:36:51-- (try: 2) http://maia.usno.navy.mil/ser7/finals.all Connecting to maia.usno.navy.mil (maia.usno.navy.mil)|199.211.133.23|:80... failed: Operation timed out. Retrying. Still no problems on primary maia (from outside US) but backup toshi not available right now. See note on http://maia.usno.navy.mil page about getusnoeop.ksh script and README. Customize and schedule to get your products from primary or backup servers as soon as they are posted (after 17.10UTC). The finals.all data does not seem to be available from iers, but just through usno. I use is to create graphs of UTC-UT1 delta. I was looking today as I wanted to add to my graph the difference between the observed and predicted values since the records started. Bulletin A is a USNO only product. IERS EOP PC data products are produced only weekly or end one month ago. Unfortunately it did not occur to me to backup the source data. I believe the above script may keep some backups. -- Take care. Thanks, Brian Inglis ___ 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.
