Re: [time-nuts] FE-5680A arrived
Mine is 0436 (still untested- too busy) -Dave - Original Message - From: Peter Gottlieb n...@verizon.net To: time-nuts@febo.com Sent: Tuesday, January 10, 2012 8:09:51 PM Subject: Re: [time-nuts] FE-5680A arrived Got another one today, date code 0435. On 1/10/2012 10:48 PM, Peter Bell wrote: Hi, Joseph The unit number just seems to be a mechanical serial number - all you can really say about it is that higher numbers are newer. The most useful number is the 4 digit prefix on the serial number - this is an EIA format date code (two digits of year, two digits of week) - all the units I've seen have been from '03 or '04 - the newest one I have is 0420 - so dating from early June 2004. There is also another date / revision label on the main PCB (visible by removing the bottom cover) - this seems to be the PCBA build date. Regards, Pete On Wed, Jan 11, 2012 at 9:03 AM, Joseph Grayjg...@zianet.com wrote: With all the talk on the list about these things, and considering the price, I could no longer resist temptation and ordered two from nichegeek. First, I was amazed at the speed at which I received these units. The order was placed last Friday, the shipment went out late Saturday and I received them today (Tuesday). In my experience, it has always taken two weeks or more to receive anything from China. I couldn't believe I got these in just three days. BTW, I paid $38 each with the free shipping. An outstanding deal IMO. I also received the semi-useless freebies. My only quibble so far is that both units were packed in nothing more than a large envelope, with a thin layer of bubble wrap added. Nothing is dented or rattling around, so hopefully they are OK. I'm just about to wire up a cable and power them on, so I'll know soon. The units I got have numbers of UN 71xxx and UN 78xxx. I don't know exactly what this means, but according to the ebay sellers, they are claiming that 6 and 7 numbers indicate newer units. Can anyone decipher this number sequence? 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. - No virus found in this message. Checked by AVG - www.avg.com Version: 10.0.1416 / Virus Database: 2109/4134 - Release Date: 01/10/12 ___ 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] FE-5680A arrived
I'm not seeing a PPS on either of these. All I see is about 17 mV P-P of noise that looks like a multi-stepped sine wave. I'm using a TDS 340 scope. Joe Gray W5JG On Tue, Jan 10, 2012 at 10:30 PM, J. L. Trantham jlt...@att.net wrote: I confess! I, too, could not resist the opportunity to 'commune' with the members of the list with these Rb units. I ordered two of the FE-5680A units ($36 ea. including shipping) from the same supplier with amazing speed (order date 1/4, arrival date 1/9 to NW Florida). They were marked 'FE-5680A UN 70021' 'S/N 0405-72179' and 'FE-5680A UN 71920' 'S/N 0413-75933'. I promptly came home, constructed a DB9 female connector, with the connections as specified in recent postings, and both units were up and locked with extremely close agreement with my TBolt and Z3816A in under 5 minutes. Pin 6 had a 1 uSec wide, 5 Volt, 1 PPS, pulse. I did not explore pins 8 or 9, the RS232 pins. I guess I'll have to go back through the list to see what, exactly, I can do with these. They, too, were packed with bubble wrap individually and then together, and in a plain envelope that was placed in a UPS plastic envelope. However, they arrived without damage, and, amazingly, very promptly. Not sure what, exactly, I will do with them yet, but they will certainly have many possible roles. Joe WB4BPP -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Joseph Gray Sent: Tuesday, January 10, 2012 8:04 PM To: Discussion of precise time and frequency measurement Subject: [time-nuts] FE-5680A arrived With all the talk on the list about these things, and considering the price, I could no longer resist temptation and ordered two from nichegeek. First, I was amazed at the speed at which I received these units. The order was placed last Friday, the shipment went out late Saturday and I received them today (Tuesday). In my experience, it has always taken two weeks or more to receive anything from China. I couldn't believe I got these in just three days. BTW, I paid $38 each with the free shipping. An outstanding deal IMO. I also received the semi-useless freebies. My only quibble so far is that both units were packed in nothing more than a large envelope, with a thin layer of bubble wrap added. Nothing is dented or rattling around, so hopefully they are OK. I'm just about to wire up a cable and power them on, so I'll know soon. The units I got have numbers of UN 71xxx and UN 78xxx. I don't know exactly what this means, but according to the ebay sellers, they are claiming that 6 and 7 numbers indicate newer units. Can anyone decipher this number sequence? 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.
Re: [time-nuts] Temperature and signal amp for 'Bay FE-5680A?
The TADD-3 uses 3 AC drivers in parallel, each going through a 51 ohm resistor. Changing those resistors to 150 ohms should work. Maybe a bit lower to account for the impedance in the drivers. I'd probably check it with a scope. bruce.griffi...@xtra.co.nz said: That approach doesn't do anything for the Vcc and GND bounce exhibited by the driver chip. GND and Vcc bounce is the cause of the high frequency ringing exhibited by the TADD-3 outputs. This ringing can even be observed at the outputs of inverters whose inputs are tied low or high in the same package I don't see how ground bounce is going to cause ringing. I'd expect the ringing to come from reflections from a long transmissions line. Anybody know what the driver in a TBolt is like? Here are 2 pictures looking at the PPS from 2 TBolts. This one has 10 ft of coax from one TBolt and and 25+10 ft from the other, with no termination at the scope. http://www.megapathdsl.net/~hmurray/time-nuts/Rigol/ring-1.png This one has 10 ft of coax with a terminator on one side and a 10X scope probe right at the BNC on the other. http://www.megapathdsl.net/~hmurray/time-nuts/Rigol/ring-2.png Damping the crossover current induced transient in the supply leads (bondwire and lead frame) inductance is one way to minimise this. A small resistor in series with the Vcc pin often works well, the resistor value being chosen for near critical damping. I'm not sure what you mean by crossover current. I'd expect a damping resistor in the Vcc lead to slow down the rise time. If you make it slow enough there won't be any ringing because the rise time will be longer than the round trip time. Then you can treat the transmission line as a capacitor. I'd expect a resistor in the Vcc lead would not slow down the fall times. If you want a slower rise time, you can also use HC rather than AC. They probably aren't strong enough to drive a 50 ohm terminator. Using surface mount packages reduces the inductance. (slightly?) Another option is the bus driver chips that have multiple Vcc/GND pins. Another problem with the TADD-3 is the sharing of a driver chip by different input frequencies which leads to intermodulation between the 2 outputs. Yup. Job security for designers. :) If you read the fine print in the data sheets for high speed chips, they usually specify a marketing number with only one output changing. The good data sheets tell you how much it slows down when multiple outputs change. -- These are my opinions, not necessarily my employer's. 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] Temperature and signal amp for 'Bay FE-5680A?
Hal Murray wrote: The TADD-3 uses 3 AC drivers in parallel, each going through a 51 ohm resistor. Changing those resistors to 150 ohms should work. Maybe a bit lower to account for the impedance in the drivers. I'd probably check it with a scope. bruce.griffi...@xtra.co.nz said: That approach doesn't do anything for the Vcc and GND bounce exhibited by the driver chip. GND and Vcc bounce is the cause of the high frequency ringing exhibited by the TADD-3 outputs. This ringing can even be observed at the outputs of inverters whose inputs are tied low or high in the same package I don't see how ground bounce is going to cause ringing. Some load capacitance is required (even the capacitance of a short track on the board plus the output pin and output device capacitances will suffice) One of the ground bounce papers from TI will show the ringing due to ground bounce (eg http://www.ti.com/lit/an/szza038b/szza038b.pdf). I'd expect the ringing to come from reflections from a long transmissions line. Transmission line current di/dt will interact with the supply (GND or Vcc) and output lead inductance. Anybody know what the driver in a TBolt is like? Here are 2 pictures looking at the PPS from 2 TBolts. This one has 10 ft of coax from one TBolt and and 25+10 ft from the other, with no termination at the scope. http://www.megapathdsl.net/~hmurray/time-nuts/Rigol/ring-1.png This one has 10 ft of coax with a terminator on one side and a 10X scope probe right at the BNC on the other. http://www.megapathdsl.net/~hmurray/time-nuts/Rigol/ring-2.png The output driver is a low impedance source possibly a 74AC04M (most likely candidate from the list of ICs used: http://www.prc68.com/I/ThunderBolt.shtml ). Damping the crossover current induced transient in the supply leads (bondwire and lead frame) inductance is one way to minimise this. A small resistor in series with the Vcc pin often works well, the resistor value being chosen for near critical damping. I'm not sure what you mean by crossover current. During the output transition there is a short time interval (in a CMOS inverter stage) where both the n channel and p channel devices are both on causing a current to flow between Vcc and ground even with no external load. I'd expect a damping resistor in the Vcc lead to slow down the rise time. If you make it slow enough there won't be any ringing because the rise time will be longer than the round trip time. Then you can treat the transmission line as a capacitor. Thats certainly not the case in the FS730C, the risetime isnt appreciably affected by the small (4R7) damping resistor in series with Vcc. Adding a series damping resistor in series with the output is insufficient to suppress ringing. I'd expect a resistor in the Vcc lead would not slow down the fall times. If you want a slower rise time, you can also use HC rather than AC. They probably aren't strong enough to drive a 50 ohm terminator. Using surface mount packages reduces the inductance. (slightly?) Another option is the bus driver chips that have multiple Vcc/GND pins. GND bounce is still readily seen, the amplitude decreases somewhat but the associated ringing frequency for a given load increases. Another problem with the TADD-3 is the sharing of a driver chip by different input frequencies which leads to intermodulation between the 2 outputs. Yup. Job security for designers. :) If you read the fine print in the data sheets for high speed chips, they usually specify a marketing number with only one output changing. The good data sheets tell you how much it slows down when multiple outputs change. Its not quite that simple transients are observed on quiet outputs due to output transitions on the switching outputs. If transitions occur simultaneously on 2 different frequency inputs connected to the same chip then simultaneous switching effects modulate the effective propagation delay of the output transitions. e.g. a 1MHz output may exhibit phase modulation at 100KHz if the 1MHz and 100KHz signals share the same output driver chip. 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] Adding adjustment pot to 5680
Arthur, 800mW will give you a 52C rise in junction temperature over ambient when not mounted to anything. The 5680s get pretty hot, probably 50C internally (has anyone measured it?). That will put you at 102C. Make sure the flavor of 7805 you selected is rated for that (most are rated for 125C). Not all are, and not all have thermal shutdown. As for reliability, without any derating, this won't give you much margin. Don't forget the cap on the output. Bob - Original Message - From: Arthur Dent golgarfrinc...@yahoo.com To: time-nuts@febo.com Sent: Tuesday, January 10, 2012 10:50 PM Subject: [time-nuts] Adding adjustment pot to 5680 You are driving the 7805 near its limit. As a rule of thumb, a TO-220 case can disipate about 1W of power, if it's free-standing. You have max 100mA with a voltage difference of 10V, resulting in 1W max. Ie the 7805 will be running at a considerable high temperature. As you have there a good heat sink already (the case), i'd mount the 7805 against the case and use wires to connect it. Attila Kinali ++ I had considered mounting the 7805 on the vertical heatsink you see to the left of the 7805 in my photo, using a short screws in either side of the the tapped hole that is already there and use leads to connect the 7805 to the connector pins, but felt it wasn't necessary. Directly connecting the regulator to the DB-9 pins was much simpler. FYI, the load is not 100Ma as you assumed, that is the max rating of the 78L05 that I didn't use. The actual load the 7805 sees in the 5680A is about 80Ma so even at the higher temperatures inside the case I don't see a problem. You are correct that it might be a better practice to mount the regulator on the heat sink, especially if this were a production item, but in this case I felt it was overkill. http://farm8.staticflickr.com/7013/6668466093_90782cf7e9_b.jpg -Arthur ___ 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] FE-5680A arrived
I tested mine the same way. Turned out the 'bumps' were real but the 'jitter' was my scopes vertical being 'noisy' and resolved by 'diddling' with the input amplitude knob. The sine wave had about 1 V P-P into the 50 ohm input of the TEK 485. Joe -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Joseph Gray Sent: Tuesday, January 10, 2012 10:20 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] FE-5680A arrived The first power supply I used couldn't provide enough current for the startup of the heater, so I had to dig out another. After fixing that issue, the first rubidium unit locked very quickly. For initial testing, I'm using a scope, triggered on my HP Z3801A. After several minutes of warm up (I didn't time it), I detect no drift in the rubidium's 10 MHz at all. I do see a bit of jitter and some bumps on the peaks of the sine wave. I'll cook this one for a while and then try unit number two. 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.
Re: [time-nuts] FE-5680A arrived
Try setting your scope to a relatively slow speed, 50 mSec/cm or so, set it to trigger on the appropriate channel, positive slope, turn off 'Auto' trigger thus just getting a sweep only if triggered, then adjust the trigger sensitivity to see if you see a sweep go across the screen once per second. If so, turn the intensity up very high and move the sweep speed to 1 uSec/cm and look very closely at the very first part of the trace, about 5 V above the base line. Should be a 1 uSec wide pulse across the screen only once per second (thus the need to turn up the intensity of the display). I used a 10X probe on pin 6 to measure this (10 Meg Input Impedance). Hope this helps. Joe -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Joseph Gray Sent: Wednesday, January 11, 2012 12:11 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] FE-5680A arrived I'm not seeing a PPS on either of these. All I see is about 17 mV P-P of noise that looks like a multi-stepped sine wave. I'm using a TDS 340 scope. Joe Gray W5JG On Tue, Jan 10, 2012 at 10:30 PM, J. L. Trantham jlt...@att.net wrote: I confess! I, too, could not resist the opportunity to 'commune' with the members of the list with these Rb units. I ordered two of the FE-5680A units ($36 ea. including shipping) from the same supplier with amazing speed (order date 1/4, arrival date 1/9 to NW Florida). They were marked 'FE-5680A UN 70021' 'S/N 0405-72179' and 'FE-5680A UN 71920' 'S/N 0413-75933'. I promptly came home, constructed a DB9 female connector, with the connections as specified in recent postings, and both units were up and locked with extremely close agreement with my TBolt and Z3816A in under 5 minutes. Pin 6 had a 1 uSec wide, 5 Volt, 1 PPS, pulse. I did not explore pins 8 or 9, the RS232 pins. I guess I'll have to go back through the list to see what, exactly, I can do with these. They, too, were packed with bubble wrap individually and then together, and in a plain envelope that was placed in a UPS plastic envelope. However, they arrived without damage, and, amazingly, very promptly. Not sure what, exactly, I will do with them yet, but they will certainly have many possible roles. Joe WB4BPP -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Joseph Gray Sent: Tuesday, January 10, 2012 8:04 PM To: Discussion of precise time and frequency measurement Subject: [time-nuts] FE-5680A arrived With all the talk on the list about these things, and considering the price, I could no longer resist temptation and ordered two from nichegeek. First, I was amazed at the speed at which I received these units. The order was placed last Friday, the shipment went out late Saturday and I received them today (Tuesday). In my experience, it has always taken two weeks or more to receive anything from China. I couldn't believe I got these in just three days. BTW, I paid $38 each with the free shipping. An outstanding deal IMO. I also received the semi-useless freebies. My only quibble so far is that both units were packed in nothing more than a large envelope, with a thin layer of bubble wrap added. Nothing is dented or rattling around, so hopefully they are OK. I'm just about to wire up a cable and power them on, so I'll know soon. The units I got have numbers of UN 71xxx and UN 78xxx. I don't know exactly what this means, but according to the ebay sellers, they are claiming that 6 and 7 numbers indicate newer units. Can anyone decipher this number sequence? 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. ___ 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] FE-5680A arrived
Joseph Gray wrote: I'm not seeing a PPS on either of these. All I see is about 17 mV P-P of noise that looks like a multi-stepped sine wave. I'm using a TDS 340 scope. I can see the 1 usec, 1pps on mine, but only if I use an analog storage scope. Although my HP54000 series scope triggers at 1PPS, for the life of me I cannot get it to display the 1 usec pulse :-(. attachment: smither.vcf___ 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] Adding adjustment pot to 5680
Just one data point: Last night, I taped a thermocouple to the top case of a unit and read 50C. Joe Gray W5JG On Wed, Jan 11, 2012 at 7:12 AM, Robert Benward rbenw...@verizon.net wrote: Arthur, 800mW will give you a 52C rise in junction temperature over ambient when not mounted to anything. The 5680s get pretty hot, probably 50C internally (has anyone measured it?). That will put you at 102C. Make sure the flavor of 7805 you selected is rated for that (most are rated for 125C). Not all are, and not all have thermal shutdown. As for reliability, without any derating, this won't give you much margin. Don't forget the cap on the output. Bob - Original Message - From: Arthur Dent golgarfrinc...@yahoo.com To: time-nuts@febo.com Sent: Tuesday, January 10, 2012 10:50 PM Subject: [time-nuts] Adding adjustment pot to 5680 You are driving the 7805 near its limit. As a rule of thumb, a TO-220 case can disipate about 1W of power, if it's free-standing. You have max 100mA with a voltage difference of 10V, resulting in 1W max. Ie the 7805 will be running at a considerable high temperature. As you have there a good heat sink already (the case), i'd mount the 7805 against the case and use wires to connect it. Attila Kinali ++ I had considered mounting the 7805 on the vertical heatsink you see to the left of the 7805 in my photo, using a short screws in either side of the the tapped hole that is already there and use leads to connect the 7805 to the connector pins, but felt it wasn't necessary. Directly connecting the regulator to the DB-9 pins was much simpler. FYI, the load is not 100Ma as you assumed, that is the max rating of the 78L05 that I didn't use. The actual load the 7805 sees in the 5680A is about 80Ma so even at the higher temperatures inside the case I don't see a problem. You are correct that it might be a better practice to mount the regulator on the heat sink, especially if this were a production item, but in this case I felt it was overkill. http://farm8.staticflickr.com/7013/6668466093_90782cf7e9_b.jpg -Arthur ___ 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] Temperature and signal amp for 'Bay FE-5680A?
I made some tests a while ago using the PPS output from a Thunderbolt. http://www.ko4bb.com/Test_Equipment/CoaxCableMatching.php Didier KO4BB Sent from my BlackBerry Wireless thingy while I do other things... -Original Message- From: Hal Murray hmur...@megapathdsl.net Sender: time-nuts-boun...@febo.com Date: Wed, 11 Jan 2012 01:59:24 To: Discussion of precise time and frequency measurementtime-nuts@febo.com Reply-To: Discussion of precise time and frequency measurement time-nuts@febo.com Subject: Re: [time-nuts] Temperature and signal amp for 'Bay FE-5680A? The TADD-3 uses 3 AC drivers in parallel, each going through a 51 ohm resistor. Changing those resistors to 150 ohms should work. Maybe a bit lower to account for the impedance in the drivers. I'd probably check it with a scope. bruce.griffi...@xtra.co.nz said: That approach doesn't do anything for the Vcc and GND bounce exhibited by the driver chip. GND and Vcc bounce is the cause of the high frequency ringing exhibited by the TADD-3 outputs. This ringing can even be observed at the outputs of inverters whose inputs are tied low or high in the same package I don't see how ground bounce is going to cause ringing. I'd expect the ringing to come from reflections from a long transmissions line. Anybody know what the driver in a TBolt is like? Here are 2 pictures looking at the PPS from 2 TBolts. This one has 10 ft of coax from one TBolt and and 25+10 ft from the other, with no termination at the scope. http://www.megapathdsl.net/~hmurray/time-nuts/Rigol/ring-1.png This one has 10 ft of coax with a terminator on one side and a 10X scope probe right at the BNC on the other. http://www.megapathdsl.net/~hmurray/time-nuts/Rigol/ring-2.png Damping the crossover current induced transient in the supply leads (bondwire and lead frame) inductance is one way to minimise this. A small resistor in series with the Vcc pin often works well, the resistor value being chosen for near critical damping. I'm not sure what you mean by crossover current. I'd expect a damping resistor in the Vcc lead to slow down the rise time. If you make it slow enough there won't be any ringing because the rise time will be longer than the round trip time. Then you can treat the transmission line as a capacitor. I'd expect a resistor in the Vcc lead would not slow down the fall times. If you want a slower rise time, you can also use HC rather than AC. They probably aren't strong enough to drive a 50 ohm terminator. Using surface mount packages reduces the inductance. (slightly?) Another option is the bus driver chips that have multiple Vcc/GND pins. Another problem with the TADD-3 is the sharing of a driver chip by different input frequencies which leads to intermodulation between the 2 outputs. Yup. Job security for designers. :) If you read the fine print in the data sheets for high speed chips, they usually specify a marketing number with only one output changing. The good data sheets tell you how much it slows down when multiple outputs change. -- These are my opinions, not necessarily my employer's. 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.
[time-nuts] Adding adjustment pot to 5680
Don't forget the cap on the output. Bob + You can see the tantalum with short leads soldered directly to the output lead on the 7805 in the photograph. http://farm8.staticflickr.com/7013/6668466093_90782cf7e9_b.jpg -Arthur ___ 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] FE-5680A arrived
On Wed, 11 Jan 2012 08:35:56 -0600, Bob Smither smit...@c-c-i.com wrote: Joseph Gray wrote: I'm not seeing a PPS on either of these. All I see is about 17 mV P-P of noise that looks like a multi-stepped sine wave. I'm using a TDS 340 scope. I can see the 1 usec, 1pps on mine, but only if I use an analog storage scope. Although my HP54000 series scope triggers at 1PPS, for the life of me I cannot get it to display the 1 usec pulse :-(. You might need to darken the oscilloscope environment or use a viewing hood. Some analog non-storage oscilloscopes, either because of design or age, are not going to be able to display a short pulse at 1 second intervals. I tested this on my old but in good condition 2230 and it could display it dimly in normal room light but my older worn 7603 can not. ___ 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] Generell help on search web-objects. was: OT: Need datasheets on photomultiplier tubes
Rex schrieb: You might want to join this Yahoo group where the question would be more on-topic... http://tech.groups.yahoo.com/group/GeigerCounterEnthusiasts The Photonis site is one of those flashy-looking places where you can only find useful information if someone has already told you where it is. No functional search or guide pages that I could detect. This site has a useful big list with some simple descriptions, but thanks to Photonis, many links to Photonis pages get 404... http://www.lastek.com.au/content/view/179/1051/ On the Photonis pages, most of the docs are found in... http://www.photonis.com/upload/industryscience/pdf/pmt/ But its contents can't be viewed. Put pdf names (listed below) at the end of the above for the full link. This helps pasted in Google: site:http://www.photonis.com/upload/industryscience/pdf/pmt/ if there a cross-links memorized. Or try: link:http://www.photonis.com/upload/industryscience/pdf/pmt/ and the last resource: www.photonis.com/upload/industryscience/pdf/pmt/ Further one can shorten links from right, correct links or try archive.org The last try is to shorten the link from _left_ ! This finds copies of files on another site. - Henry -- ehydra.dyndns.info ___ 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] FE-5680A arrived
On Tue, Jan 10, 2012 at 10:11 PM, Joseph Gray jg...@zianet.com wrote: I'm not seeing a PPS on either of these. All I see is about 17 mV P-P of noise that looks like a multi-stepped sine wave. I'm using a TDS 340 scope. PPS is likely there. I can't see it on my Tek 465B scope either. -- 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] FE-5680A arrived
On Wed, 11 Jan 2012 08:37:02 -0800, Chris Albertson albertson.ch...@gmail.com wrote: On Tue, Jan 10, 2012 at 10:11 PM, Joseph Gray jg...@zianet.com wrote: I'm not seeing a PPS on either of these. All I see is about 17 mV P-P of noise that looks like a multi-stepped sine wave. I'm using a TDS 340 scope. PPS is likely there. I can't see it on my Tek 465B scope either. The TDS340 is a digital storage oscilloscope. It should have no problem at all displaying the pulse if it is 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] FE-5680A arrived
Hi A good old logic probe can come in handy from time to time. They certainly aren't very expensive. Bob -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Chris Albertson Sent: Wednesday, January 11, 2012 11:37 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] FE-5680A arrived On Tue, Jan 10, 2012 at 10:11 PM, Joseph Gray jg...@zianet.com wrote: I'm not seeing a PPS on either of these. All I see is about 17 mV P-P of noise that looks like a multi-stepped sine wave. I'm using a TDS 340 scope. PPS is likely there. I can't see it on my Tek 465B scope either. -- 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. ___ 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] Spoofing..
There is an interesting article in this month's GPS World on spoofing. http://www.nxtbook.com/nxtbooks/questex/gps0112/#/28 Rob Kimberley ___ 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] FE-5680A arrived
Joe I have a TDS360 - - try using ACQUIRE and PEAK DETECT - - you should then see the pulse sitting on the top of the mush - - if you then increase the Horizontal Sweep you can see and measure the pulse. Good luck Roy -Original Message- From: Joseph Gray Sent: Wednesday, January 11, 2012 6:11 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] FE-5680A arrived I'm not seeing a PPS on either of these. All I see is about 17 mV P-P of noise that looks like a multi-stepped sine wave. I'm using a TDS 340 scope. Joe Gray W5JG On Tue, Jan 10, 2012 at 10:30 PM, J. L. Trantham jlt...@att.net wrote: I confess! I, too, could not resist the opportunity to 'commune' with the members of the list with these Rb units. I ordered two of the FE-5680A units ($36 ea. including shipping) from the same supplier with amazing speed (order date 1/4, arrival date 1/9 to NW Florida). They were marked 'FE-5680A UN 70021' 'S/N 0405-72179' and 'FE-5680A UN 71920' 'S/N 0413-75933'. I promptly came home, constructed a DB9 female connector, with the connections as specified in recent postings, and both units were up and locked with extremely close agreement with my TBolt and Z3816A in under 5 minutes. Pin 6 had a 1 uSec wide, 5 Volt, 1 PPS, pulse. I did not explore pins 8 or 9, the RS232 pins. I guess I'll have to go back through the list to see what, exactly, I can do with these. They, too, were packed with bubble wrap individually and then together, and in a plain envelope that was placed in a UPS plastic envelope. However, they arrived without damage, and, amazingly, very promptly. Not sure what, exactly, I will do with them yet, but they will certainly have many possible roles. Joe WB4BPP -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Joseph Gray Sent: Tuesday, January 10, 2012 8:04 PM To: Discussion of precise time and frequency measurement Subject: [time-nuts] FE-5680A arrived With all the talk on the list about these things, and considering the price, I could no longer resist temptation and ordered two from nichegeek. First, I was amazed at the speed at which I received these units. The order was placed last Friday, the shipment went out late Saturday and I received them today (Tuesday). In my experience, it has always taken two weeks or more to receive anything from China. I couldn't believe I got these in just three days. BTW, I paid $38 each with the free shipping. An outstanding deal IMO. I also received the semi-useless freebies. My only quibble so far is that both units were packed in nothing more than a large envelope, with a thin layer of bubble wrap added. Nothing is dented or rattling around, so hopefully they are OK. I'm just about to wire up a cable and power them on, so I'll know soon. The units I got have numbers of UN 71xxx and UN 78xxx. I don't know exactly what this means, but according to the ebay sellers, they are claiming that 6 and 7 numbers indicate newer units. Can anyone decipher this number sequence? 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. ___ 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] FE-5680A arrived
On Wed, Jan 11, 2012 at 9:09 AM, Bob Camp li...@rtty.us wrote: Hi A good old logic probe can come in handy from time to time. They certainly aren't very expensive. On my FE5680 I was convinced there was no PPS. My HP5328 counter could not find a pulse.All I saw was high frequency noise on the scope. And the spec listed pin-6 as N/C. Then I thought to amplify and low pass filter and now the PPS shows up on the HP5328 with a 100.0 uS period. I think the PPS is there but needs a bit a signal conditioning to be useful. Fortunately my old Tek 465B scope has a low pass function and a vertical amplifier output BNC on the rear. I had to crank the amp up and attenuate it on the counter. Has anyone been able to put the PPS fronmthe FE5680 to practical use yet. For example sending it to a computer to drive an NTP server? Detecting it is one thing. reliable use 24x7 is another thing. 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] FE-5680A PPS on pin 6 (or not)
All three of my FE-5680A units show a constant DC voltage on pin 6, with absolutely no PPS signal. This is when pin 3 is low (lock) and the 10 MHz output is indeed locked at 10 MHz (within 4E-10 anyway). I am using a Tek TDS-210 digital scope which certainly has no problem with a 1 usec pulse, and in fact, I did see a nice square 1 usec pulse on Pin 6 once, from one unit. But it went away after a power cycle, and did not return. I know many (most?) people do see the 1 PPS so perhaps all three of my units are damaged (?) I presume the 1 PPS signal would come from the XC9572 CPLD which also drives the 10 MHz signal, so I'll try tracing back which pin that is. I labelled a few CPLD pins already (60 MHz in, 30 MHz and 10 MHz out) here: https://picasaweb.google.com/lh/photo/dUtTwuNnP-y2nL-wR84ELNMTjNZETYmyPJy0liipFm0 ---Original Message--- From: Chris Albertson albertson.ch...@gmail.com To: Discussion of precise time and frequency measurement time-nuts@febo.com Subject: Re: [time-nuts] FE-5680A arrived Sent: 11 Jan '12 08:37 On Tue, Jan 10, 2012 at 10:11 PM, Joseph Gray jg...@zianet.com wrote: I'm not seeing a PPS on either of these. All I see is about 17 mV P-P of noise that looks like a multi-stepped sine wave. I'm using a TDS 340 scope. ___ 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] FE-5680A arrived
Hi To use the 1 pps with a normal (RS-232 based) NTP server, you would need a pulse stretcher. You probably could use it directly with one of the Soekris boards that take the pps straight into a GPIO pin. Bob -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Chris Albertson Sent: Wednesday, January 11, 2012 12:50 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] FE-5680A arrived On Wed, Jan 11, 2012 at 9:09 AM, Bob Camp li...@rtty.us wrote: Hi A good old logic probe can come in handy from time to time. They certainly aren't very expensive. On my FE5680 I was convinced there was no PPS. My HP5328 counter could not find a pulse.All I saw was high frequency noise on the scope. And the spec listed pin-6 as N/C. Then I thought to amplify and low pass filter and now the PPS shows up on the HP5328 with a 100.0 uS period. I think the PPS is there but needs a bit a signal conditioning to be useful. Fortunately my old Tek 465B scope has a low pass function and a vertical amplifier output BNC on the rear. I had to crank the amp up and attenuate it on the counter. Has anyone been able to put the PPS fronmthe FE5680 to practical use yet. For example sending it to a computer to drive an NTP server? Detecting it is one thing. reliable use 24x7 is another thing. 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. ___ 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] FE-5680A PPS on pin 6 (or not)
You can put me in the No 1 PPS on pin 6 camp, too - I made extensive
attempts to detect it on the first couple of units (multiple scopes,
even connecting in to an edge-sensitive interrupt pin) and detected
nothing. The other units, I just poked a scope (TDS420A) at it, but
could see nothing.
One thing I did notice was that in one of the photos on here (the one
about the 5V switching regulator) there were some components ('AC161
and associated parts) installed on the PCB that were not present on
any of the units I opened. This may be related, or may not - but at
the least it does suggest that despite having the same P/N these units
might not all have the same build spec.
Regards,
Pete Bell
On Thu, Jan 12, 2012 at 12:54 AM, beale be...@bealecorner.com wrote:
All three of my FE-5680A units show a constant DC voltage on pin 6, with
absolutely no PPS signal. This is when pin 3 is low (lock) and the 10 MHz
output is indeed locked at 10 MHz (within 4E-10 anyway). I am using a Tek
TDS-210 digital scope which certainly has no problem with a 1 usec pulse, and
in fact, I did see a nice square 1 usec pulse on Pin 6 once, from one unit.
But it went away after a power cycle, and did not return. I know many
(most?) people do see the 1 PPS so perhaps all three of my units are damaged
(?)
I presume the 1 PPS signal would come from the XC9572 CPLD which also drives
the 10 MHz signal, so I'll try tracing back which pin that is. I labelled a
few CPLD pins already (60 MHz in, 30 MHz and 10 MHz out) here:
https://picasaweb.google.com/lh/photo/dUtTwuNnP-y2nL-wR84ELNMTjNZETYmyPJy0liipFm0
---Original Message---
From: Chris Albertson albertson.ch...@gmail.com
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Subject: Re: [time-nuts] FE-5680A arrived
Sent: 11 Jan '12 08:37
On Tue, Jan 10, 2012 at 10:11 PM, Joseph Gray jg...@zianet.com wrote:
I'm not seeing a PPS on either of these. All I see is about 17 mV P-P
of noise that looks like a multi-stepped sine wave. I'm using a TDS
340 scope.
___
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Re: [time-nuts] FE-5680A arrived
The FE-5680A 1pps is not sync'd to UTC. According to my calculations, it would take several hours to walk the 1pps to UTC given the 3.8e-5 adjustment range via the RS232 input. A thunderbolt, an arduino, and patience. On 01/11/2012 09:50 AM, Chris Albertson wrote: On Wed, Jan 11, 2012 at 9:09 AM, Bob Campli...@rtty.us wrote: Hi A good old logic probe can come in handy from time to time. They certainly aren't very expensive. On my FE5680 I was convinced there was no PPS. My HP5328 counter could not find a pulse.All I saw was high frequency noise on the scope. And the spec listed pin-6 as N/C. Then I thought to amplify and low pass filter and now the PPS shows up on the HP5328 with a 100.0 uS period. I think the PPS is there but needs a bit a signal conditioning to be useful. Fortunately my old Tek 465B scope has a low pass function and a vertical amplifier output BNC on the rear. I had to crank the amp up and attenuate it on the counter. Has anyone been able to put the PPS fronmthe FE5680 to practical use yet. For example sending it to a computer to drive an NTP server? Detecting it is one thing. reliable use 24x7 is another thing. 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. -- 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.
Re: [time-nuts] FE-5680A arrived
Le 11/01/2012 19:24, Chuck Forsberg WA7KGX N2469R a écrit : The FE-5680A 1pps is not sync'd to UTC. According to my calculations, it would take several hours to walk the 1pps to UTC given the 3.8e-5 adjustment range via the RS232 input. A thunderbolt, an arduino, and patience. You don't need to take the walk. Just fudge the ATOM driver time1 parameter after scoping the offset between GPS PPS and 5680A PPS signals. You would need to reset it on a Rb power cycle though. ___ 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] FE-5680A arrived
My backup FE-5680A arrived from Nichgeek a while ago. It has a lower serial number than the first one. I have not measured its current draw yet, or checked for 1pps. So far it does not seem as stable as the first one I got. -- 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 attachment: newold.gif___ 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] Spoofing..
If you follow the link to get an offline PDF, you get the whole magazine in 32 MB. The result is interesting, but some of us would be better off downloading at night. This is the wrong list to start a discussion of your blinding Internet connection speed. Bill Hawkins -Original Message- From: Rob Kimberley Sent: Wednesday, January 11, 2012 11:44 AM There is an interesting article in this month's GPS World on spoofing. http://www.nxtbook.com/nxtbooks/questex/gps0112/#/28 Rob Kimberley ___ 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] How do I get to the archived messages?
How do I get to the archived messages? Can someone provide a link? Thanks, Paul ___ 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] How do I get to the archived messages?
I was able to access the archives via the link that was appended by the system to the email below (and will likely be appended to this email as well) On 1/11/2012 1:03 PM, Paul F. Sehorne wrote: How do I get to the archived messages? Can someone provide a link? Thanks, Paul ___ 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] FE-5680A arrived
c...@omen.com said: So far it does not seem as stable as the first one I got. How are you measuring stability? -- These are my opinions, not necessarily my employer's. 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] FE-5680A arrived
By casually comparing the phase plots of the two FE-5680As vs. Thunderbolt. But it may not be finished settling down. On 01/11/2012 11:14 AM, Hal Murray wrote: c...@omen.com said: So far it does not seem as stable as the first one I got. How are you measuring stability? -- 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.
Re: [time-nuts] Spoofing..
Not sure I'll bother in future. Ingratitude of the highest order! -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Bill Hawkins Sent: 11 January 2012 19:03 To: 'Discussion of precise time and frequency measurement' Subject: Re: [time-nuts] Spoofing.. If you follow the link to get an offline PDF, you get the whole magazine in 32 MB. The result is interesting, but some of us would be better off downloading at night. This is the wrong list to start a discussion of your blinding Internet connection speed. Bill Hawkins -Original Message- From: Rob Kimberley Sent: Wednesday, January 11, 2012 11:44 AM There is an interesting article in this month's GPS World on spoofing. http://www.nxtbook.com/nxtbooks/questex/gps0112/#/28 Rob Kimberley ___ 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] Spoofing..
There is an interesting article in this month's GPS World on spoofing. http://www.nxtbook.com/nxtbooks/questex/gps0112/#/28 Rob Kimberley Thanks for posting that, Rob. I didn't know of the magazine, and found other articles of interest as well. Please continue to highlight items of interest - it's most helpful. Cheers, 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] FE-5680A arrived
You might also consider adding the TAPR Fat PPS to stretch the pulse. See TAPR.org. Tom Holmes, N8ZM Tipp City, OH EM79 -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of David Sent: Wednesday, January 11, 2012 10:17 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] FE-5680A arrived On Wed, 11 Jan 2012 08:35:56 -0600, Bob Smither smit...@c-c-i.com wrote: Joseph Gray wrote: I'm not seeing a PPS on either of these. All I see is about 17 mV P-P of noise that looks like a multi-stepped sine wave. I'm using a TDS 340 scope. I can see the 1 usec, 1pps on mine, but only if I use an analog storage scope. Although my HP54000 series scope triggers at 1PPS, for the life of me I cannot get it to display the 1 usec pulse :-(. You might need to darken the oscilloscope environment or use a viewing hood. Some analog non-storage oscilloscopes, either because of design or age, are not going to be able to display a short pulse at 1 second intervals. I tested this on my old but in good condition 2230 and it could display it dimly in normal room light but my older worn 7603 can not. ___ 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] FE-5680A arrived
Here is a poor man's pulse stretcher. http://www.ko4bb.com/Test_Equipment/Thunderbolt/PulseStretching/ Probably not good enough for timing applications, but plenty good enough to see the pulse on an analog scope. Didier KO4BB Sent from my BlackBerry Wireless thingy while I do other things... -Original Message- From: Bob Camp li...@rtty.us Sender: time-nuts-boun...@febo.com Date: Wed, 11 Jan 2012 13:04:38 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] FE-5680A arrived Hi To use the 1 pps with a normal (RS-232 based) NTP server, you would need a pulse stretcher. You probably could use it directly with one of the Soekris boards that take the pps straight into a GPIO pin. Bob -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Chris Albertson Sent: Wednesday, January 11, 2012 12:50 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] FE-5680A arrived On Wed, Jan 11, 2012 at 9:09 AM, Bob Camp li...@rtty.us wrote: Hi A good old logic probe can come in handy from time to time. They certainly aren't very expensive. On my FE5680 I was convinced there was no PPS. My HP5328 counter could not find a pulse.All I saw was high frequency noise on the scope. And the spec listed pin-6 as N/C. Then I thought to amplify and low pass filter and now the PPS shows up on the HP5328 with a 100.0 uS period. I think the PPS is there but needs a bit a signal conditioning to be useful. Fortunately my old Tek 465B scope has a low pass function and a vertical amplifier output BNC on the rear. I had to crank the amp up and attenuate it on the counter. Has anyone been able to put the PPS fronmthe FE5680 to practical use yet. For example sending it to a computer to drive an NTP server? Detecting it is one thing. reliable use 24x7 is another thing. 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. ___ 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] FE-5680A arrived
Bob Smither wrote: Joseph Gray wrote: I'm not seeing a PPS on either of these. All I see is about 17 mV P-P of noise that looks like a multi-stepped sine wave. I'm using a TDS 340 scope. I can see the 1 usec, 1pps on mine, but only if I use an analog storage scope. Although my HP54000 series scope triggers at 1PPS, for the life of me I cannot get it to display the 1 usec pulse :-(. OK, I am still learning how to set up my 54645D. Upon reseting the scope and adjusting the trigger it is clear that the 1pps pulse is there. The pulse is TTL level and very close to 1 usec wide. I have noticed the the 1pps pulse goes away when I make a large change to the offset count through the RS232 connection. The pulse comes back after the unit has settled for a while. attachment: smither.vcf___ 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] Spoofing..
Hello, WHAT??? Rob, that was a simple warning to people who might not be expecting to tie up their machine while 32 megabytes downloaded. The magazine was very interesting. Thanks for posting the link. Bill Hawkins P.S. I did not mean you, Rob, when I said your speed. I was trying to head off an OT thread by others. Such is email. -Original Message- From: Rob Kimberley Sent: Wednesday, January 11, 2012 1:57 PM -Original Message- From: Bill Hawkins Sent: 11 January 2012 19:03 If you follow the link to get an offline PDF, you get the whole magazine in 32 MB. The result is interesting, but some of us would be better off downloading at night. This is the wrong list to start a discussion of your blinding Internet connection speed. Bill Hawkins -Original Message- From: Rob Kimberley Sent: Wednesday, January 11, 2012 11:44 AM There is an interesting article in this month's GPS World on spoofing. http://www.nxtbook.com/nxtbooks/questex/gps0112/#/28 Rob Kimberley ___ 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] FE-5680A arrived
Le 11/01/2012 19:36, mike cook a écrit : Le 11/01/2012 19:24, Chuck Forsberg WA7KGX N2469R a écrit : The FE-5680A 1pps is not sync'd to UTC. According to my calculations, it would take several hours to walk the 1pps to UTC given the 3.8e-5 adjustment range via the RS232 input. A thunderbolt, an arduino, and patience. You don't need to take the walk. Just fudge the ATOM driver time1 parameter after scoping the offset between GPS PPS and 5680A PPS signals. You would need to reset it on a Rb power cycle though. just thought of something else which worked for me and may be of use. If you don't have a scope or TIC to get the Rbs PPS offset from GPS, you can let NTP do it for you. You need a stable reference such as GPS to be set up as a prefered server, then set up the atom driver for the 5680A with no offset and prevent selection with noselect parameter and or push the stratum from 0 to 8. Once NTP has been running a while, the offset of the DUTs PPS will be seen in the ntpq -pn output. You can plug that in as the DUTs fudge time1 parameter and restart ntpd. You may need to iterate. ex. server 127.127.22.1 minpoll 4 maxpoll 4 noselect fudge 127.127.22.1 stratum 8 refid PPS1 time1 0.00 flag3 0 flag2 1 # enable PPS module remote refid st t when poll reach delay offset jitter == 127.127.22.1.PPS1. 8 l9 16 3770.000 -1.268 0.093 *145.238.203.14 .TS-3. 1 u 67 64 377 34.4731.572 0.399 remote refid st t when poll reach delay offset jitter == 127.127.22.1.PPS1. 8 l 11 16 3770.000 -1.528 0.038 *145.238.203.14 .TS-3. 1 u 19 64 377 33.3000.217 0.750 ntpq -pn only gives usec resolution displays but ntpd calculates in nanosecs. You have to have logging enabled and look at the peerstat data if you want that. ___ 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] FE-5680A arrived
On 1/11/2012 12:22 PM, Tom Holmes wrote: You might also consider adding the TAPR Fat PPS to stretch the pulse. See TAPR.org. Tom Holmes, N8ZM Tipp City, OH EM79 -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of David Sent: Wednesday, January 11, 2012 10:17 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] FE-5680A arrived On Wed, 11 Jan 2012 08:35:56 -0600, Bob Smithersmit...@c-c-i.com wrote: Joseph Gray wrote: I'm not seeing a PPS on either of these. All I see is about 17 mV P-P of noise that looks like a multi-stepped sine wave. I'm using a TDS 340 scope. I can see the 1 usec, 1pps on mine, but only if I use an analog storage scope. Although my HP54000 series scope triggers at 1PPS, for the life of me I cannot get it to display the 1 usec pulse :-(. You might need to darken the oscilloscope environment or use a viewing hood. Some analog non-storage oscilloscopes, either because of design or age, are not going to be able to display a short pulse at 1 second intervals. I tested this on my old but in good condition 2230 and it could display it dimly in normal room light but my older worn 7603 can not. ___ 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. Or you might take a look at Don Lancaster's TTL Cookbook. All kind of pulse stretchers in there. Randy ___ 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] FE-5680A Mechanical Question
Should I ever have time to pursue the Rb unit, what happens when I 'drill out' all the rivets that mount the unit to the PCB that it arrived on? Any reason to keep it on the PCB? Does the bottom cover come off? Will I need to replace the rivets with something else to keep the bottom cover on? Thanks in advance. Joe ___ 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] FE-5680A PPS on pin 6 (or not)
Hi,
I'm interested in seen those photos, because I collected a bunch of then
from various owners but I dont see this 'AC161 even on in the switching
regulator pair.
I made a goof the other day when I connected the 5 V input to a 15 V
power supply and toasted the 'ACT240 buffer which drives the lock
indicator and the PPS outputs. I know that the 5 V is used to generate
the +3.3 V in an internal regulator and because I'm not sure what else
is toasted I want to trace this voltage and see if it is ok. The unit
is mostly working, it locks and also generates the 1PPS, measured at the
input pin of the buffer, but I want to check everything that can be
damaged and replace the failed parts.
So I'll benefit from partial schematics, parts location and
identifications and all the like. Please share the info that you have.
Best regards,
Ignacio, EB4APL
On 11/01/2012 19:22, Peter Bell wrote:
You can put me in the No 1 PPS on pin 6 camp, too - I made extensive
attempts to detect it on the first couple of units (multiple scopes,
even connecting in to an edge-sensitive interrupt pin) and detected
nothing. The other units, I just poked a scope (TDS420A) at it, but
could see nothing.
One thing I did notice was that in one of the photos on here (the one
about the 5V switching regulator) there were some components ('AC161
and associated parts) installed on the PCB that were not present on
any of the units I opened. This may be related, or may not - but at
the least it does suggest that despite having the same P/N these units
might not all have the same build spec.
Regards,
Pete Bell
On Thu, Jan 12, 2012 at 12:54 AM, bealebe...@bealecorner.com wrote:
All three of my FE-5680A units show a constant DC voltage on pin 6, with
absolutely no PPS signal. This is when pin 3 is low (lock) and the 10 MHz
output is indeed locked at 10 MHz (within 4E-10 anyway). I am using a Tek
TDS-210 digital scope which certainly has no problem with a 1 usec pulse, and
in fact, I did see a nice square 1 usec pulse on Pin 6 once, from one unit. But
it went away after a power cycle, and did not return. I know many (most?)
people do see the 1 PPS so perhaps all three of my units are damaged (?)
I presume the 1 PPS signal would come from the XC9572 CPLD which also drives
the 10 MHz signal, so I'll try tracing back which pin that is. I labelled a
few CPLD pins already (60 MHz in, 30 MHz and 10 MHz out) here:
https://picasaweb.google.com/lh/photo/dUtTwuNnP-y2nL-wR84ELNMTjNZETYmyPJy0liipFm0
---Original Message---
From: Chris Albertsonalbertson.ch...@gmail.com
To: Discussion of precise time and frequency measurementtime-nuts@febo.com
Subject: Re: [time-nuts] FE-5680A arrived
Sent: 11 Jan '12 08:37
On Tue, Jan 10, 2012 at 10:11 PM, Joseph Grayjg...@zianet.com wrote:
I'm not seeing a PPS on either of these. All I see is about 17 mV P-P
of noise that looks like a multi-stepped sine wave. I'm using a TDS
340 scope.
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Re: [time-nuts] FE-5680A Mechanical Question
Joe, Those are NOT rivets, but actual screws that have a spline tool used for removal. BillWB6BNQ J. L. Trantham wrote: Should I ever have time to pursue the Rb unit, what happens when I 'drill out' all the rivets that mount the unit to the PCB that it arrived on? Any reason to keep it on the PCB? Does the bottom cover come off? Will I need to replace the rivets with something else to keep the bottom cover on? Thanks in advance. Joe ___ 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] FE-5680A arrived
In a message dated 12/01/2012 02:06:27 GMT Standard Time, li...@rtty.us writes: They have a VCXO in the loop. It probably does not have much over +/- 50 Hz of useful range. Whilst that would seem reasonable, I seem to be seeing stability issues once the offset exceeds +/- a few parts in 10^9. Of the three I've adjusted so far, it seems to me that there's quite noticeable jitter on the output frequency until it approaches to within a few parts in 10^10 or 10^11 of 10 MHz. Regards Nigel GM8PZR ___ 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] FE-5680A Mechanical Question
My rivets were tiny Torx screws. -Brian, WA1ZMS -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of J. L. Trantham Sent: Wednesday, January 11, 2012 9:22 PM To: 'Discussion of precise time and frequency measurement' Subject: [time-nuts] FE-5680A Mechanical Question Should I ever have time to pursue the Rb unit, what happens when I 'drill out' all the rivets that mount the unit to the PCB that it arrived on? Any reason to keep it on the PCB? Does the bottom cover come off? Will I need to replace the rivets with something else to keep the bottom cover on? Thanks in advance. Joe ___ 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] FE-5680A arrived
I notice that on eBay nichegeek provides a NEW OCXO VECTRON 63.8976Mhz with the FE-5680A. What is it used for. Is something external needed besides the power supply? Thanks, Paul ___ 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] FE-5680A PPS on pin 6 (or not)
Hi, Ignacio
OK, the photo that shows the 'AC161 is here:
http://ka7oei.com/FE-5680A-top-jumper_1a.jpg
None of the units I've opened have these parts in them.
As far as I can see, the only places the 5V feeds are the 'AC240 and
that Maxim regulator - the 3.3V rail runs basically all the digital
circuitry in the unit, but if it's locking up, then it's reasonable to
assume that all that stuff is working since it's all rather critical
to the unit's operation.
Regards,
Pete
On Thu, Jan 12, 2012 at 9:23 AM, EB4APL eb4...@cembreros.jazztel.es wrote:
Hi,
I'm interested in seen those photos, because I collected a bunch of then
from various owners but I dont see this 'AC161 even on in the switching
regulator pair.
I made a goof the other day when I connected the 5 V input to a 15 V power
supply and toasted the 'ACT240 buffer which drives the lock indicator and
the PPS outputs. I know that the 5 V is used to generate the +3.3 V in an
internal regulator and because I'm not sure what else is toasted I want to
trace this voltage and see if it is ok. The unit is mostly working, it
locks and also generates the 1PPS, measured at the input pin of the buffer,
but I want to check everything that can be damaged and replace the failed
parts.
So I'll benefit from partial schematics, parts location and identifications
and all the like. Please share the info that you have.
Best regards,
Ignacio, EB4APL
On 11/01/2012 19:22, Peter Bell wrote:
You can put me in the No 1 PPS on pin 6 camp, too - I made extensive
attempts to detect it on the first couple of units (multiple scopes,
even connecting in to an edge-sensitive interrupt pin) and detected
nothing. The other units, I just poked a scope (TDS420A) at it, but
could see nothing.
One thing I did notice was that in one of the photos on here (the one
about the 5V switching regulator) there were some components ('AC161
and associated parts) installed on the PCB that were not present on
any of the units I opened. This may be related, or may not - but at
the least it does suggest that despite having the same P/N these units
might not all have the same build spec.
Regards,
Pete Bell
On Thu, Jan 12, 2012 at 12:54 AM, bealebe...@bealecorner.com wrote:
All three of my FE-5680A units show a constant DC voltage on pin 6, with
absolutely no PPS signal. This is when pin 3 is low (lock) and the 10 MHz
output is indeed locked at 10 MHz (within 4E-10 anyway). I am using a Tek
TDS-210 digital scope which certainly has no problem with a 1 usec pulse,
and in fact, I did see a nice square 1 usec pulse on Pin 6 once, from one
unit. But it went away after a power cycle, and did not return. I know many
(most?) people do see the 1 PPS so perhaps all three of my units are damaged
(?)
I presume the 1 PPS signal would come from the XC9572 CPLD which also
drives the 10 MHz signal, so I'll try tracing back which pin that is. I
labelled a few CPLD pins already (60 MHz in, 30 MHz and 10 MHz out) here:
https://picasaweb.google.com/lh/photo/dUtTwuNnP-y2nL-wR84ELNMTjNZETYmyPJy0liipFm0
---Original Message---
From: Chris Albertsonalbertson.ch...@gmail.com
To: Discussion of precise time and frequency
measurementtime-nuts@febo.com
Subject: Re: [time-nuts] FE-5680A arrived
Sent: 11 Jan '12 08:37
On Tue, Jan 10, 2012 at 10:11 PM, Joseph Grayjg...@zianet.com wrote:
I'm not seeing a PPS on either of these. All I see is about 17 mV
P-P
of noise that looks like a multi-stepped sine wave. I'm using a TDS
340 scope.
___
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Re: [time-nuts] FE-5680A arrived
My second unit arrived. Locked in not much more than a minute. Definite pulse on pin 6, took a quick picture off of a cheap digital scope (which had no trouble whatsoever capturing it): ___ 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] FE-5680A arrived
Paul, The Vectron 63. MHz oscillator is just a through in freebee. Here is the pin-out from a reliable inside source: Supply voltage (Vs) is 3.3V +/-5% Pin 1 is RF out Pin 2 is ground Pin 3 is Vc Pin 4 is Enable-disable (not used on all designs) Pin 5 is Vs Looking at the bottom with the side that has 3 pins orientated at the top, pin 1 is on the left, pin 2 centered and pin 3 on the right. On the bottom edge pin 4 is on the right and pin 5 on the left. I was led to understand that the current version C4500 is a very close cousin. The C4500 spec sheet also shows the same pin-out. The 63. MHz unit is around a couple of hundred ppb stability. Nothing great but would be ok as a source for a DDS project if you did not need tight specs. BillWB6BNQ Paul F. Sehorne wrote: I notice that on eBay nichegeek provides a NEW OCXO VECTRON 63.8976Mhz with the FE-5680A. What is it used for. Is something external needed besides the power supply? Thanks, Paul ___ 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] FE-5680A Mechanical Question
Boy!!! I would have 'screwed' that up! Bill was correct. Mine were 1/16th inch Allen screws, not Torx as Brian has, and were very easily removed. They appear to be 3mm dia. X 5mm long with a 0.5mm pitch screw, in spite of having a 1/16th inch hex opening. There were two Phillips head screws underneath that appear to hold the bottom cover in place. On another topic, there is a small opening on the side (near the 'FE'Trademark) with what appears to be a multi-turn pot inside. What is that? Also, the 'sticker' on the top, that includes the 'FE' Trademark, 'FE-5680A', etc., has a 'soft spot' on the bottom edge. In addition, there is a 'soft spot' under the 'sticker' at the bottom of the front, near the connector, and includes the serial number. Does anyone know what is under these 'stickers'? Thanks again. Joe -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Brian, WA1ZMS Sent: Wednesday, January 11, 2012 8:52 PM To: 'Discussion of precise time and frequency measurement' Subject: Re: [time-nuts] FE-5680A Mechanical Question My rivets were tiny Torx screws. -Brian, WA1ZMS -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of J. L. Trantham Sent: Wednesday, January 11, 2012 9:22 PM To: 'Discussion of precise time and frequency measurement' Subject: [time-nuts] FE-5680A Mechanical Question Should I ever have time to pursue the Rb unit, what happens when I 'drill out' all the rivets that mount the unit to the PCB that it arrived on? Any reason to keep it on the PCB? Does the bottom cover come off? Will I need to replace the rivets with something else to keep the bottom cover on? Thanks in advance. Joe ___ 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] FE-5680A arrived
Darn, I guess this list does not allow photos in the messages. Here it is: http://petergottlieb.com/images/FE-5680A_pulse.jpg On 1/11/2012 10:29 PM, Peter Gottlieb wrote: My second unit arrived. Locked in not much more than a minute. Definite pulse on pin 6, took a quick picture off of a cheap digital scope (which had no trouble whatsoever capturing it): ___ 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. - No virus found in this message. Checked by AVG - www.avg.com Version: 10.0.1416 / Virus Database: 2109/4137 - Release Date: 01/11/12 ___ 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] FE-5680A Mechanical Question
they are screws - real small torx head Bill Riches Cape May, NJ Should I ever have time to pursue the Rb unit, what happens when I 'drill out' all the rivets that mount the unit to the PCB that it arrived on? Any reason to keep it on the PCB? Does the bottom cover come off? Will I need to replace the rivets with something else to keep the bottom cover on? Thanks in advance. Joe ___ 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] FE-5680A Mechanical Question
The pot accessible through the hole in the casing appears is the fine frequency adjust pot on the older units - on these, it's connected to an ADC input, but as far as I can see adjusting it does nothing at all. There are two screws hidden under the labels that hold the top over on - you also need to remove the two small screws on the side that bolt the D-type mounting bracket in place. Regards, Pete Bell On Thu, Jan 12, 2012 at 10:33 AM, J. L. Trantham jlt...@att.net wrote: Boy!!! I would have 'screwed' that up! Bill was correct. Mine were 1/16th inch Allen screws, not Torx as Brian has, and were very easily removed. They appear to be 3mm dia. X 5mm long with a 0.5mm pitch screw, in spite of having a 1/16th inch hex opening. There were two Phillips head screws underneath that appear to hold the bottom cover in place. On another topic, there is a small opening on the side (near the 'FE'Trademark) with what appears to be a multi-turn pot inside. What is that? Also, the 'sticker' on the top, that includes the 'FE' Trademark, 'FE-5680A', etc., has a 'soft spot' on the bottom edge. In addition, there is a 'soft spot' under the 'sticker' at the bottom of the front, near the connector, and includes the serial number. Does anyone know what is under these 'stickers'? Thanks again. Joe -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Brian, WA1ZMS Sent: Wednesday, January 11, 2012 8:52 PM To: 'Discussion of precise time and frequency measurement' Subject: Re: [time-nuts] FE-5680A Mechanical Question My rivets were tiny Torx screws. -Brian, WA1ZMS -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of J. L. Trantham Sent: Wednesday, January 11, 2012 9:22 PM To: 'Discussion of precise time and frequency measurement' Subject: [time-nuts] FE-5680A Mechanical Question Should I ever have time to pursue the Rb unit, what happens when I 'drill out' all the rivets that mount the unit to the PCB that it arrived on? Any reason to keep it on the PCB? Does the bottom cover come off? Will I need to replace the rivets with something else to keep the bottom cover on? Thanks in advance. Joe ___ 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] FE-5680A Mechanical Question
Bill, Brian, Bill, and Peter, Thanks for the info. All I need now is a 'project' to incorporate the unit into. In the back of my mind, I have the thought of a 'box' that will be battery powered or 110 VAC powered (perhaps with an internal SLA battery) and include a GPSDO and Rb unit (possibly a GPSDRbO) for the purpose of a 'reference' for portable operation in the microwave regions. Ah Dreaming! Makes looking forward to retiring very attractive! Joe -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Peter Bell Sent: Wednesday, January 11, 2012 10:28 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] FE-5680A Mechanical Question The pot accessible through the hole in the casing appears is the fine frequency adjust pot on the older units - on these, it's connected to an ADC input, but as far as I can see adjusting it does nothing at all. There are two screws hidden under the labels that hold the top over on - you also need to remove the two small screws on the side that bolt the D-type mounting bracket in place. Regards, Pete Bell On Thu, Jan 12, 2012 at 10:33 AM, J. L. Trantham jlt...@att.net wrote: Boy!!! I would have 'screwed' that up! Bill was correct. Mine were 1/16th inch Allen screws, not Torx as Brian has, and were very easily removed. They appear to be 3mm dia. X 5mm long with a 0.5mm pitch screw, in spite of having a 1/16th inch hex opening. There were two Phillips head screws underneath that appear to hold the bottom cover in place. On another topic, there is a small opening on the side (near the 'FE'Trademark) with what appears to be a multi-turn pot inside. What is that? Also, the 'sticker' on the top, that includes the 'FE' Trademark, 'FE-5680A', etc., has a 'soft spot' on the bottom edge. In addition, there is a 'soft spot' under the 'sticker' at the bottom of the front, near the connector, and includes the serial number. Does anyone know what is under these 'stickers'? Thanks again. Joe -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Brian, WA1ZMS Sent: Wednesday, January 11, 2012 8:52 PM To: 'Discussion of precise time and frequency measurement' Subject: Re: [time-nuts] FE-5680A Mechanical Question My rivets were tiny Torx screws. -Brian, WA1ZMS -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of J. L. Trantham Sent: Wednesday, January 11, 2012 9:22 PM To: 'Discussion of precise time and frequency measurement' Subject: [time-nuts] FE-5680A Mechanical Question Should I ever have time to pursue the Rb unit, what happens when I 'drill out' all the rivets that mount the unit to the PCB that it arrived on? Any reason to keep it on the PCB? Does the bottom cover come off? Will I need to replace the rivets with something else to keep the bottom cover on? Thanks in advance. Joe ___ 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] FE-5680A Mechanical Question
How would a GPSDRbO work? Phase lock the DDS output to the GPS? Phase lock a VCXO to the GPS and then phase lock to the RbO on loss of GPS lock? On Wed, 11 Jan 2012 22:55:58 -0600, J. L. Trantham jlt...@att.net wrote: Bill, Brian, Bill, and Peter, Thanks for the info. All I need now is a 'project' to incorporate the unit into. In the back of my mind, I have the thought of a 'box' that will be battery powered or 110 VAC powered (perhaps with an internal SLA battery) and include a GPSDO and Rb unit (possibly a GPSDRbO) for the purpose of a 'reference' for portable operation in the microwave regions. ___ 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] FE-5680A Mechanical Question
How would a GPSDRbO work? The same as if you were building a GPSDO using a quartz oscillator. Since the Rb has better long term stability, you can use a longer time constant on the filter. -- These are my opinions, not necessarily my employer's. 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] FE-5680A Mechanical Question
1/16 Allen wrench WB6BNQ Joe, Those are NOT rivets, but actual screws that have a spline tool used for removal. BillWB6BNQ J. L. Trantham wrote: Should I ever have time to pursue the Rb unit, what happens when I 'drill out' all the rivets that mount the unit to the PCB that it arrived on? Any reason to keep it on the PCB? Does the bottom cover come off? Will I need to replace the rivets with something else to keep the bottom cover on? Thanks in advance. Joe ___ 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. -- 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.
Re: [time-nuts] FE-5680A Mechanical Question
On Wed, 11 Jan 2012 22:44:47 -0800, Hal Murray hmur...@megapathdsl.net wrote: How would a GPSDRbO work? The same as if you were building a GPSDO using a quartz oscillator. Since the Rb has better long term stability, you can use a longer time constant on the filter. But how do you adjust the RgO output frequency? That's why I asked if A DDS would be used. Nevermind. I just found it. The RgO cell can be frequency adjusted magnetically. ___ 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] FE-5680A Mechanical Question
I have one in the 02xx, one in 03xx, and one in 04xx. I opened the 02xx up and installed the 5v regulator hack but not the freq. adjust. There are two pots on the board, one externally adjustable and another close by. Both fell off(!)due to cold solder joints! fluxed 'em up and soldered them back in place. put the thing back together, and it locked up in about 5 min. 1 pps at 1 us wide is there, pin 6, triggers my TEK scope just fine. Drift compared to Z3851(Ithink)about one cycle in 2-3 min. Good looking 2vp-p sinewave 1 meg 1x probe. Will try the other two tomorrow, after install the 5v mod. Don Peter Bell The pot accessible through the hole in the casing appears is the fine frequency adjust pot on the older units - on these, it's connected to an ADC input, but as far as I can see adjusting it does nothing at all. There are two screws hidden under the labels that hold the top over on - you also need to remove the two small screws on the side that bolt the D-type mounting bracket in place. Regards, Pete Bell On Thu, Jan 12, 2012 at 10:33 AM, J. L. Trantham jlt...@att.net wrote: Boy!!! I would have 'screwed' that up! Bill was correct. Mine were 1/16th inch Allen screws, not Torx as Brian has, and were very easily removed. They appear to be 3mm dia. X 5mm long with a 0.5mm pitch screw, in spite of having a 1/16th inch hex opening. There were two Phillips head screws underneath that appear to hold the bottom cover in place. On another topic, there is a small opening on the side (near the 'FE'Trademark) with what appears to be a multi-turn pot inside. What is that? Also, the 'sticker' on the top, that includes the 'FE' Trademark, 'FE-5680A', etc., has a 'soft spot' on the bottom edge. In addition, there is a 'soft spot' under the 'sticker' at the bottom of the front, near the connector, and includes the serial number. Does anyone know what is under these 'stickers'? Thanks again. Joe -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Brian, WA1ZMS Sent: Wednesday, January 11, 2012 8:52 PM To: 'Discussion of precise time and frequency measurement' Subject: Re: [time-nuts] FE-5680A Mechanical Question My rivets were tiny Torx screws. -Brian, WA1ZMS -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of J. L. Trantham Sent: Wednesday, January 11, 2012 9:22 PM To: 'Discussion of precise time and frequency measurement' Subject: [time-nuts] FE-5680A Mechanical Question Should I ever have time to pursue the Rb unit, what happens when I 'drill out' all the rivets that mount the unit to the PCB that it arrived on? Any reason to keep it on the PCB? Does the bottom cover come off? Will I need to replace the rivets with something else to keep the bottom cover on? Thanks in advance. Joe ___ 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. -- 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.
