Re: [time-nuts] Temperature and signal amp for 'Bay FE-5680A?
davidwh...@gmail.com said: I looked at the TADD-3 design and it sacrifices back termination impedance for signal swing which results in ringing but I presume not too much if people were using it successfully. If the far end (receiver) is terminated to match the coax, there will be no ringing and no reflection so the mismatch in back termination won't be a problem. (I'm being sloppy when I say coax. It also works for PCB traces or any other transmission line.) There is an approach that gets full height at the receiver and good back termination (and low power). Digital geeks call it series termination. The idea is to leave the far end (receiver) open and use good back termination to catch the reflection. When switching, the wave will go down the coax at half height. When it gets to the far end (open circuit), it bounces back. The far end sees a clean switch to full height. That's the sum of the original wave and the reflection. When the reflection gets back to the transmitter, it sees a clean termination and doesn't generate any more reflections. Note that this only works if you have a single receiver at the far end of the transmission line. If you have a receiver half way down the line, it sees a half-height signal between the time the outgoing wave goes past and the time the reflection gets back. 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. -- 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: davidwh...@gmail.com said: I looked at the TADD-3 design and it sacrifices back termination impedance for signal swing which results in ringing but I presume not too much if people were using it successfully. If the far end (receiver) is terminated to match the coax, there will be no ringing and no reflection so the mismatch in back termination won't be a problem. (I'm being sloppy when I say coax. It also works for PCB traces or any other transmission line.) There is an approach that gets full height at the receiver and good back termination (and low power). Digital geeks call it series termination. The idea is to leave the far end (receiver) open and use good back termination to catch the reflection. When switching, the wave will go down the coax at half height. When it gets to the far end (open circuit), it bounces back. The far end sees a clean switch to full height. That's the sum of the original wave and the reflection. When the reflection gets back to the transmitter, it sees a clean termination and doesn't generate any more reflections. Note that this only works if you have a single receiver at the far end of the transmission line. If you have a receiver half way down the line, it sees a half-height signal between the time the outgoing wave goes past and the time the reflection gets back. 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. 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 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. 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. 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] Trimble GPS antenna preamp, anyone know the gain?
With that amount of gain, I would assume they don't have to be low noise, though they could be. That is, I assume they are designed for use with an amplified antenna. [The noise margin should be set by the antenna preamp, not an amp down stream.] But then again, they would have to pass DC to the actual amplified antenna, as well as work as a 10dB amp. On 1/9/2012 7:38 PM, Magnus Danielson wrote: On 01/10/2012 02:44 AM, Chris Albertson wrote: I bought a pair of in-line Trimble amplifiers but I can't find any specs. Anyone know the gain? They are in a machined stainless steel box with two N connectors. Trimble sells them bundled with a long antenna cable so that the amp (I assume) compensates for the cable loss. I opened one up. I'm very sure they are preamps intented for being in the antenna feed line. I won these on ebay for $0.01 for the pair, $5.00 for shipping. The seller paid more than $5.01 for postage and lost money on the transaction. I bought them because even if they were dead the cases are usfull. Now I think I want to run one of them ahead of a passive splitter and have multiple receivers on one antenna The 4000SSI manual says it gives 30 m additional cable-reach on RG-213 and the L1 damping of RG-213 gives about 10 dB for 100 foot, so I'd guess you have a 10 dB amplification in them. Cheers, Magnus ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Temperature and signal amp for 'Bay FE-5680A?
On Tue, 10 Jan 2012 21:57:49 +1300, Bruce Griffiths bruce.griffi...@xtra.co.nz wrote: 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. 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 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. 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. I have never seen that much ground bounce before so assumed it was a termination problem. Was the driver chip decoupling inadequate? That at least would be easy enough to fix. ___ 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?
Hi A more ideal solution for the 5680 might be a little board with a 5V regulator on it, and the 1 pps buffering. Hang it on the existing 9 pin connector and have another (properly configured) 9 pin on the board for RS-232 com. Pretty small board, pretty cheap parts. If you wanted the full blown version, drop an LED on the lock output. Bob -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of David Sent: Tuesday, January 10, 2012 10:19 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Temperature and signal amp for 'Bay FE-5680A? On Tue, 10 Jan 2012 21:57:49 +1300, Bruce Griffiths bruce.griffi...@xtra.co.nz wrote: 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. 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 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. 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. I have never seen that much ground bounce before so assumed it was a termination problem. Was the driver chip decoupling inadequate? That at least would be easy enough to fix. ___ 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?
David wrote: On Tue, 10 Jan 2012 21:57:49 +1300, Bruce Griffiths bruce.griffi...@xtra.co.nz wrote: 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. 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 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. 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. I have never seen that much ground bounce before so assumed it was a termination problem. Was the driver chip decoupling inadequate? That at least would be easy enough to fix. ___ 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, its due to the high switching speed of the output stage. Such ground bounce is typical for ACMOS devices without a staged output device turn on. Low inductance decoupling has no effect on internal bondwire and leadframe inductance. Apart from redesigning to chip to have a more gradual output stage turn on, damping of the circuit is the only effective cure. An example of the effectiveness of this can be found in the SRS FS730 distribution amplifier CMOS output option. 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] Temperature and signal amp for 'Bay FE-5680A?
Bruce, That is at first counterintuitive (conventional wisdom and good design practice suggests good decoupling caps across the supply pins), but it makes perfect sense. I have to try this (a small resistor in series with the positive supply rail) when I get home. Thanks for the tip. Didier KO4BB Sent from my BlackBerry Wireless thingy while I do other things... -Original Message- From: Bruce Griffiths bruce.griffi...@xtra.co.nz Sender: time-nuts-boun...@febo.com Date: Wed, 11 Jan 2012 07:30:27 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? David wrote: On Tue, 10 Jan 2012 21:57:49 +1300, Bruce Griffiths bruce.griffi...@xtra.co.nz wrote: 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. 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 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. 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. I have never seen that much ground bounce before so assumed it was a termination problem. Was the driver chip decoupling inadequate? That at least would be easy enough to fix. ___ 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, its due to the high switching speed of the output stage. Such ground bounce is typical for ACMOS devices without a staged output device turn on. Low inductance decoupling has no effect on internal bondwire and leadframe inductance. Apart from redesigning to chip to have a more gradual output stage turn on, damping of the circuit is the only effective cure. An example of the effectiveness of this can be found in the SRS FS730 distribution amplifier CMOS output option. 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. ___ 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] Trimble GPS antenna preamp, anyone know the gain?
On Tue, Jan 10, 2012 at 1:22 AM, gary li...@lazygranch.com wrote: With that amount of gain, I would assume they don't have to be low noise, though they could be. That is, I assume they are designed for use with an amplified antenna. [The noise margin should be set by the antenna preamp, not an amp down stream.] But then again, they would have to pass DC to the actual amplified antenna, as well as work as a 10dB amp. I pulled the cover plate off and looked. It is very simple inside. The DC is from the receiver is blocked by a cap and there is an inducter to take DC off the line.The amp looks to be maybe some kind of op-amp that drives a single transistor. I can't read the part numbers on any of the active components. We know it is a line extender so the 10dB guess is reasonable 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] Trimble GPS antenna preamp, anyone know the gain?
Does it somehow pass DC up to the preamp in the GPS? You killed on ebay. The key was the stupid description on the connectors. One thing to try for old parts is to use archive.org on the manufacturer's website. -Original Message- From: Chris Albertson albertson.ch...@gmail.com Sender: time-nuts-boun...@febo.com Date: Tue, 10 Jan 2012 10:59:44 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] Trimble GPS antenna preamp, anyone know the gain? On Tue, Jan 10, 2012 at 1:22 AM, gary li...@lazygranch.com wrote: With that amount of gain, I would assume they don't have to be low noise, though they could be. That is, I assume they are designed for use with an amplified antenna. [The noise margin should be set by the antenna preamp, not an amp down stream.] But then again, they would have to pass DC to the actual amplified antenna, as well as work as a 10dB amp. I pulled the cover plate off and looked. It is very simple inside. The DC is from the receiver is blocked by a cap and there is an inducter to take DC off the line.The amp looks to be maybe some kind of op-amp that drives a single transistor. I can't read the part numbers on any of the active components. We know it is a line extender so the 10dB guess is reasonable 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] Adding adjustment pot to 5680
On Mon, 9 Jan 2012 13:06:12 -0800 (PST) Arthur Dent golgarfrinc...@yahoo.com wrote: On the inside of the case where the DB-9 pins go through the circuit board, I mounted a 7805 fixed regulator. I cut a piece out of pin 4 and connected the output of the 7805 to the board side of the pin with a tantalum cap for bypass. I decided not to use a 78L05 because at the elevated temperature I felt it would be cutting it too close to the 100MA current limit. [...] http://farm8.staticflickr.com/7013/6668466093_90782cf7e9_b.jpg 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 -- Why does it take years to find the answers to the questions one should have asked long ago? ___ 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 output circuit with 3 74AC04 output stages paralleled is stolen from Tom Clark's design in the original TAC GPS interface board. The 47 ohm resistors aren't intended as back terminations; if you assume a low output impedance at the chip, the three resistors are effectively in parallel, so more together they are more like 16 ohms than 50. The value was a compromise between output voltage swing (trying to make sure that TTL levels are maintained at the far end of the cable) and protection against one '04 stage backfeeding another if their switching times aren't identical. There's been discussion that lower values, maybe 27 or 33 ohms, might be OK and would deliver more swing at the far end. Bruce is correct about the crosstalk problem -- in a desire to provide lots of flexibility, I designed the TADD-3 so that each of the six output channels could be jumper-set to a different pulse rate. Each output uses 1/2 of a 74AC04, and between trace radiation and Vcc bounce, there is cross-mod if two channels sharing an output chip are set to different rates. The simple answer is to keep each pair (channels 1 and 2, 3 and 4, 5 and 6) set to the same rate. John Bruce Griffiths said the following on 01/10/2012 03:57 AM: 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. 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 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. 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. 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. ___ 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] OT: Need datasheets on photomultiplier tubes
I just picked up a bunch of nice apparently new condition Photonis brand PMTs, models XP3312/SQ, XP3212/SQ, XP5312/SN1, and XP5212/SN1. I found their website but it appears they don't make PMTs anymore, and have no info on their own former products. Searching around for the XP3312 so far, I couldn't find anything except people trying to sell them, and a partial datasheet for the similar XP3214. Does anyone know where to find the data on these, or what may have become of the product line? I assume it was sold to a competitor. Also, there may be equivalent or cross-referenced model info available. Ed ___ 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] OT: Need datasheets on photomultiplier tubes
First off, try contacting the company. They are certainly still in the PMT business. Try www.photonis.com or Google: photonis -ebay It might be a selected version of a standard PMT. Their product line looks kinda like Burle, BTW. Definitely not Hammamatsu. -John I just picked up a bunch of nice apparently new condition Photonis brand PMTs, models XP3312/SQ, XP3212/SQ, XP5312/SN1, and XP5212/SN1. I found their website but it appears they don't make PMTs anymore, and have no info on their own former products. Searching around for the XP3312 so far, I couldn't find anything except people trying to sell them, and a partial datasheet for the similar XP3214. Does anyone know where to find the data on these, or what may have become of the product line? I assume it was sold to a competitor. Also, there may be equivalent or cross-referenced model info available. Ed ___ 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] OT: Need datasheets on photomultiplier tubes
The history tab is interesting. Another chunk of US moves out of the country On Tue, Jan 10, 2012 at 5:46 PM, J. Forster j...@quikus.com wrote: First off, try contacting the company. They are certainly still in the PMT business. Try www.photonis.com or Google: photonis -ebay It might be a selected version of a standard PMT. Their product line looks kinda like Burle, BTW. Definitely not Hammamatsu. -John I just picked up a bunch of nice apparently new condition Photonis brand PMTs, models XP3312/SQ, XP3212/SQ, XP5312/SN1, and XP5212/SN1. I found their website but it appears they don't make PMTs anymore, and have no info on their own former products. Searching around for the XP3312 so far, I couldn't find anything except people trying to sell them, and a partial datasheet for the similar XP3214. Does anyone know where to find the data on these, or what may have become of the product line? I assume it was sold to a competitor. Also, there may be equivalent or cross-referenced model info available. Ed ___ 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] 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.
Re: [time-nuts] FE-5680A arrived
On Tue, Jan 10, 2012 at 6:03 PM, Joseph Gray jg...@zianet.com wrote: 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? I got the same units packed the same way, also about as fast. They were both at close to 10MHz as my counter can measure. I think all the $40 units are functionally the same. Now I need to put in to an enclosure with a power supply and build a controller from a Up. I really don't want to use a full sized PC. 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] OT: Need datasheets on photomultiplier tubes
Ed, I have uploaded a Photonis Catalog (much too large to e-mail) and two data sheets, one of which you mentioned needing, to my web site at: http://www.ni6e.com/PMT/Photonis/ I hope you will find the information useful. Regards, Peter On 1/10/2012 5:37 PM, ed breya wrote: I just picked up a bunch of nice apparently new condition Photonis brand PMTs, models XP3312/SQ, XP3212/SQ, XP5312/SN1, and XP5212/SN1. I found their website but it appears they don't make PMTs anymore, and have no info on their own former products. Searching around for the XP3312 so far, I couldn't find anything except people trying to sell them, and a partial datasheet for the similar XP3214. Does anyone know where to find the data on these, or what may have become of the product line? I assume it was sold to a competitor. Also, there may be equivalent or cross-referenced model info available. Ed ___ 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
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 Gray jg...@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.
Re: [time-nuts] OT: Need datasheets on photomultiplier tubes
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. Basic catalogs for different Photonis sizes... Product_25-29-39.pdf Product_51-60.pdf Product_76-90-130.pdf From that, I was able to guess that sticking a B on the end of some Lastek broken link names might work and found... XP3312B.pdf XP3212B.pdf XP5312B.pdf I couldn't find XP5212 but looking at the Lastek page, it may be similar to 5292 which I found as... XP5292B.pdf HTH -Rex, KK6MK On 1/10/2012 5:37 PM, ed breya wrote: I just picked up a bunch of nice apparently new condition Photonis brand PMTs, models XP3312/SQ, XP3212/SQ, XP5312/SN1, and XP5212/SN1. I found their website but it appears they don't make PMTs anymore, and have no info on their own former products. Searching around for the XP3312 so far, I couldn't find anything except people trying to sell them, and a partial datasheet for the similar XP3214. Does anyone know where to find the data on these, or what may have become of the product line? I assume it was sold to a competitor. Also, there may be equivalent or cross-referenced model info available. Ed ___ 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
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
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.
Re: [time-nuts] FE-5680A arrived
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.
Re: [time-nuts] FE-5680A arrived
Thanks, Pete. I have 0411 and 0434 date codes. Joe Gray W5JG On Tue, Jan 10, 2012 at 8:48 PM, Peter Bell bell.pe...@gmail.com 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 Gray jg...@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. ___ 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
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.
