Re: [time-nuts] FE-5680A not responding to serial commands

=- From: time-nuts <time-nuts-boun...@febo.com> on behalf of Jonas Jalling <jo...@jalling.dk> Sent: November 19, 2017 11:30 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] FE-5680A not responding to serial commands Hi Bryan, I don't know, so probably n

Re: [time-nuts] FE-5680A not responding to serial commands

_ > From: time-nuts <time-nuts-boun...@febo.com> on behalf of Jonas Jalling < > jo...@jalling.dk> > Sent: November 19, 2017 12:20 AM > To: time-nuts@febo.com > Subject: [time-nuts] FE-5680A not responding to serial commands > > Hello al

Re: [time-nuts] FE-5680A not responding to serial commands

: time-nuts <time-nuts-boun...@febo.com> on behalf of Jonas Jalling <jo...@jalling.dk> Sent: November 19, 2017 12:20 AM To: time-nuts@febo.com Subject: [time-nuts] FE-5680A not responding to serial commands Hello all, I have an old FE-5680a I bought years ago, that surfaced from my s

[time-nuts] FE-5680A not responding to serial commands

Hello all, I have an old FE-5680a I bought years ago, that surfaced from my storage boxes the other day. I thought I would experiment with disciplining it to my M12+t GPS. I have some problems adjusting the frequency though. If I put a scope on pins 5 and 7 of the DS80C323 processor, I can see the

Re: [time-nuts] FE-5680A Year of Manufacture

> Le 27 mai 2016 à 22:10, Bob Camp a écrit : > > Hi > > Best guess is that the 0331 at the start is the date code. 31st week of 2003 > would > be it’s manufacture date. > > Bob > Bob’s guess fits with mine too. All between 0321 and 0345 >> On May 27, 2016, at 3:09 PM,

Re: [time-nuts] FE-5680A Year of Manufacture

Hi Best guess is that the 0331 at the start is the date code. 31st week of 2003 would be it’s manufacture date. Bob > On May 27, 2016, at 3:09 PM, Richard Webb wrote: > > New to this list, this week - having lusted after a 56' since seeing Gerry > Sweeney's series of

[time-nuts] FE-5680A Year of Manufacture

New to this list, this week - having lusted after a 56' since seeing Gerry Sweeney's series of videos on this unit and building up a distribution amp, and then finally getting one. I was interested in knowing how old my unit is, is there a way of decoding the serial number to give a date code? -

Re: [time-nuts] FE-5680A GPSDO controller also works with FE-5650A

> On May 23, 2016, at 11:34 AM, Skip Withrow wrote: > > Hello Time-Nuts, > > Nick Sayer's GPSDO controller will also work with the FEI FE-5650A rubidium > oscillators as well. A small modification is needed to the board, but is > rather trivial. > > First, the 5680

[time-nuts] FE-5680A GPSDO controller also works with FE-5650A

Hello Time-Nuts, Nick Sayer's GPSDO controller will also work with the FEI FE-5650A rubidium oscillators as well. A small modification is needed to the board, but is rather trivial. First, the 5680 outputs 10MHz on pin-7 of the DB-9, the 5650 has a separate SMA connector. So, pin-7 needs to be

Re: [time-nuts] FE-5680A GPS discipline board on sale now

Absolutely. There’s a standard AVR ISP header on the board and the firmware is open source - on github - so even if I didn’t do it, anyone else could. > On May 22, 2016, at 9:04 AM, GandalfG8--- via time-nuts > wrote: > > Nick, > > This looks very interesting but just

Re: [time-nuts] FE-5680A GPS discipline board on sale now

Nick, This looks very interesting but just wondering, will there be an option for end users to reprogram the board themselves just in case there does turn out to be any bugs in the software, and if so would you be making updates available? Regards Nigel GM8PZR

Re: [time-nuts] FE-5680A GPS discipline board on sale now

On Fri, 20 May 2016 07:03:10 -0700 Nick Sayer via time-nuts wrote: > > The discharge resistor of the integrator (R13) is with 10M way too high. > > The PCB resistance is usually in the same order of magnitude. Ie with > > a resistance that high, the actual resistance highly

Re: [time-nuts] FE-5680A GPS discipline board on sale now

All the more reason to just observe the log and manually select the value to burn in, IMHO. If you happen to see that the discipline is alternating between adjacent values, then you can "de-dither" by adding back the two lost resolution bits and selecting the correct low-bits by interpolation.

Re: [time-nuts] FE-5680A GPS discipline board on sale now

You SHOULD never have to write very frequently to the EEPROM. As long at the 5680 is connected to the GPS you don't have to write to the EEPROM at all. Only time you'd need to write is just before it is disconnected. Will you do that even three times a week. The unit that discipline the 5680

Re: [time-nuts] FE-5680A GPS discipline board on sale now

You're right. The EEPROM of concern is the one in the 5680. Since they're used, you have no idea how many writes they've already endured (likely a low number), and they're quite old. Sent from my iPhone > On May 20, 2016, at 3:20 PM, paul swed wrote: > > Mark > By

Re: [time-nuts] FE-5680A GPS discipline board on sale now

Mark By todays standards yes. But they were not that great 10 years ago. So I may be crossing wires. I am speaking off the eeprom in the 5680 and I think you are speaking to the one in the AVR. That would be of the modern type. Regards Paul WB8TSL On Fri, May 20, 2016 at 5:31 PM, Mark Sims

[time-nuts] FE-5680A GPS discipline board on sale now

I think the EEPROM in AVR chips is rated at 100,000 writes. Several people have tested them and most found they would survive at least 5 million writes... YMMV, of course. One write every 24 hours is still under 10K writes in a reasonable lifespan for a GPSDO. It’s a

Re: [time-nuts] FE-5680A GPS discipline board on sale now

Hello to the group. I would like to add a comment to this thread. I agree with Bobs comment on the eeprom writes. For modern units its 100K plus but does depend on the memory cell technology. However aren't the 5680s about 10 years old? If thats true then the write life cycle was much lower back

Re: [time-nuts] FE-5680A GPS discipline board on sale now

Hi If you go through the math on your eeprom, there is a point at which writes “don’t matter”. It depends a bit on the part you have and your target life. One write every 24 hours is still under 10K writes in a reasonable lifespan for a GPSDO. It’s a rare eeprom that is rated that low. Bob

Re: [time-nuts] FE-5680A GPS discipline board on sale now

Rather then a manual button, you might always burn in the EFC value after finding it stable for some number of hours. Then after that only burn it again under some strict conditions like being stable for twice as many hours and the value in the EEPROM is different from what it needs to be,

Re: [time-nuts] FE-5680A GPS discipline board on sale now

> On May 20, 2016, at 2:29 AM, Attila Kinali wrote: > > Hoi Nick! > > On Thu, 19 May 2016 10:08:10 -0700 > Nick Sayer via time-nuts wrote: > > >> This is a mash-up of my breakout board and GPSDO. You give it 30+W 18-24 >> VDC in (hack up a surplus

Re: [time-nuts] FE-5680A GPS discipline board on sale now

Hoi Nick! On Thu, 19 May 2016 10:08:10 -0700 Nick Sayer via time-nuts wrote: > This is a mash-up of my breakout board and GPSDO. You give it 30+W 18-24 > VDC in (hack up a surplus laptop power supply) and it supplies up to 2A @ 15 > VDC and 500 mA @ 5 VDC. In my testing I

[time-nuts] FE-5680A GPS discipline board on sale now

This is a mash-up of my breakout board and GPSDO. You give it 30+W 18-24 VDC in (hack up a surplus laptop power supply) and it supplies up to 2A @ 15 VDC and 500 mA @ 5 VDC. In my testing I see around 25 mV p-p of ripple on the 15V rail. The 5V rail is a bit noisier at around 35 mV.

Re: [time-nuts] FE-5680A tuning step and pre-lock stability?

OK, 256*50*17E-15 is a more comfortable 2.176E-10, easier to measure. Anyway, I have found out just today that there are 17digits/second counters: On Sat, May 7, 2016 at 4:18 PM, Nick Sayer via time-nuts wrote: > I'm not measuring the actual step. I'm moving 256 steps at a

Re: [time-nuts] FE-5680A tuning step and pre-lock stability?

Hi The way it’s normally found is in a control loop. The fact that the loop is “dead” for 50 or 500 steps and then suddenly does something is what you quickly notice. If you are manually tuning a loop, it does show up. Bob > On May 7, 2016, at 7:26 AM, Azelio Boriani

Re: [time-nuts] FE-5680A tuning step and pre-lock stability?

I'm not measuring the actual step. I'm moving 256 steps at a time and observing that THAT is 50ish times larger than expected. I'm extrapolating that single-stepping would move 50 times more than expected, but I have no way of testing that. Sent from my iPhone > On May 7, 2016, at 4:26 AM,

Re: [time-nuts] FE-5680A tuning step and pre-lock stability?

How can anyone of us tell wheater a tuning step is or not at the level of 10 at -15? Maybe only TVB can... Are you sure that the 50 times greater than is not related to your measure instead of the real capability of the 5680A? On Sat, May 7, 2016 at 6:51 AM, Nick Sayer via time-nuts

Re: [time-nuts] FE-5680A tuning step and pre-lock stability?

Hi If you go back into the archives, there are a long series of posts about the tuning word and tuning behavior of the 5880. Simple answers: No the real resolution is not the same as the LSB on the tuning word. The tuning is closer to 1x10^12 than to 1x10^-15. Bob > On May 7, 2016, at 12:51

[time-nuts] FE-5680A tuning step and pre-lock stability?

I got a second 5680 in the mail the other day and so far my firmware isn’t bricking it, so.. yay. A couple of odd things have turned up, though. 1. So far as I can experimentally tell, the tuning step on this unit is 50 times larger than the 17E-15 quoted by FEI. Either the tuning curve is not

Re: [time-nuts] FE-5680A Breakout board

Hi John, apologies for the delay. The instructions were a 'work in progress' as I was sending out the kits, so sent PDFs instead of printed docs. I've emailed you direct a copy of the latest version which is somewhat newer than the copy posted here. If any one else is still to build their kit,

Re: [time-nuts] FE-5680A Breakout board

Hi Ian -- Happy holidays! A few years ago I got some of the breakout board kits you did for the FE-5680A. They've finally risen to the top of my "to assemble pile." :-) Looking for the schematic and any assembly info you might have available -- I only have the boards and parts but can't

Re: [time-nuts] FE-5680A Breakout board

Apologies, all -- this wasn't meant for the list. Thanks to another time-nut, though, I now have the info! Best, John On 12/19/2015 12:53 PM, John Ackermann N8UR wrote: Hi Ian -- Happy holidays! A few years ago I got some of the breakout board kits you did for the FE-5680A. They've

[time-nuts] FE-5680A breakout board

I’d like to quickly mention that I’ve now got an FE-5680A “breakout board” for sale on Tindie. It has a 2.1mm barrel connector for 16-24 VDC @ 30W - easily obtainable from a surplus laptop power supply. It has a buck converter to make 15V and an LDO (from that) to make 5V. It has a two pin SIP

Re: [time-nuts] FE-5680A software calibration units ?

> On Sep 19, 2015, at 4:20 PM, Nick Sayer via time-nuts > wrote: > […] > I’ve tested it against GPS and as it came, it had about a 0.5 ppm error. Oops. That was supposed to be 0.5 ppb - 500 ppt. ___ time-nuts mailing list --

Re: [time-nuts] FE-5680A software calibration units ?

Hi Assuming it shows locked, that would suggest that (for what ever reason) it’s been re-tuned at some point after it left the factory. Bob > On Sep 20, 2015, at 9:06 PM, Nick Sayer via time-nuts > wrote: > > >> On Sep 19, 2015, at 4:20 PM, Nick Sayer via time-nuts

Re: [time-nuts] FE-5680A software calibration units ?

When I got it, the setting was zero. That suggests to me that the factory tuning was erased, assuming that the factory tunes it the same way - by changing the value adjusted by that software. > On Sep 21, 2015, at 4:34 AM, Bob Camp wrote: > > Hi > > Assuming it shows locked,

Re: [time-nuts] FE-5680A software calibration units ?

Depends on who you got it from Sent from Samsung tabletNick Sayer via time-nuts wrote:When I got it, the setting was zero. That suggests to me that the factory tuning was erased, assuming that the factory tunes it the same way - by changing the value adjusted by that

[time-nuts] FE-5680A software calibration units ?

I’ve designed and built a small power/interface board for my FE-5680A. It takes DC power from a surplus laptop power supply (16-24 VDC) and uses a buck converter to drop that down to 15v and a 5v LDO to supply the 5v pin. It brings the serial and PPS out to a 4 pin SIP header and the 10 MHz to

Re: [time-nuts] FE-5680A pin 6?

There are many options. Describe the connector(s). Some have more than one connector. What have you applied to each pin? Do not say you applied +15v AND +5V, etc. without saying which pins. John WA4WDL Bob Camp wrote: > Hi > > There are far more unique pinouts for the

Re: [time-nuts] FE-5680A pin 6?

On Thu, 10 Sep 2015 18:06:23 -0700, Nick Sayer via time-nuts wrote: > What I wonder about is pin 6 on the connector. Google results seem to > indicate that that’s supposed to be a PPS output, but what I get on it > is a fixed -5v or so. Anybody know what this signal is supposed to be? AFAIK

Re: [time-nuts] FE-5680A pin 6?

That makes sense. Thanks! That’ll help when it comes time to attempt to calibrate it. In this case, I doubt the seller speaks enough English to ask. But I can look at all of the pinout variations to find one with a TX pin on that wire. > On Sep 11, 2015, at 3:59 AM, Bob Camp

Re: [time-nuts] FE-5680A pin 6?

Hi There are far more unique pinouts for the 5680 than anybody can keep track of. Three also is very little that ties the markings on the unit to a specific pinout. If you are getting -5V, my guess is that you have an RS-232 output on that pin. Normal drill is to go back to the seller and

Re: [time-nuts] FE-5680A pin 6?

I figured it out. I was counting the bottom row from the wrong end. To actually find the PPS signal I had to set my scope to one-shot triggering at a very fast timebase setting (I used 500 ns/div). It’s only 1 µs wide, but it was there. > On Sep 11, 2015, at 6:07 AM, Nick Sayer

Re: [time-nuts] FE-5680A pin 6?

Hi Nick, FE-5680A is a whole family of Rb oscillators that have in common the case and name but the functionality, connectors and inner stuff varies a lot. Some are programmable on a wide frequency margin, others has a fixed frequency output, mostly 10 MHz. The connector arrangement also

[time-nuts] FE-5680A pin 6?

I’ve acquired an eBay 5680. I’ve hooked it up to +15 and +5 and am getting 10 MHz out and the test pin is low. The unit is warm and within any reasonable expectations, it appears to be working properly. What I wonder about is pin 6 on the connector. Google results seem to indicate that that’s

Re: [time-nuts] FE-5680A commands

- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of EB4APL Sent: Friday, 19 June, 2015 10:30 To: Discussion of precise time and frequency measurement Subject: [time-nuts] FE-5680A commands Hello, I was wondering if anybody has the full command set for this Rb oscillator. I know

Re: [time-nuts] FE-5680A commands

Hi If you dig into the archives (maybe 3 years ago), there was a lot of digging into various 5680 commands. As you have noted, there apparently isn’t anything like a “standard” 5680. The appear to have made a number of different designs over the years. There are multiple different pc board

Re: [time-nuts] FE-5680A commands

- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of EB4APL Sent: Friday, 19 June, 2015 10:30 To: Discussion of precise time and frequency measurement Subject: [time-nuts] FE-5680A commands Hello, I was wondering if anybody has the full command set for this Rb oscillator. I know

[time-nuts] FE-5680A commands

Hello, I was wondering if anybody has the full command set for this Rb oscillator. I know that FE-5680A means very different things and some commands are unit type dependent, but I think that there should be commands to monitor some health data, something similar to the LPRO-101 and FRS-C

[time-nuts] FE-5680a DGND/GND separate?

All, I'm doing a simple PCB design for a breakout for the venerable FE-5680a, and I'm curious if there's any need/desire to separate out the GND/DGND (pins 2 and 5). In my test connection, I just used pin 2 for grounding the 15V supply, and pin 5 for everything else, but I figured they're

[time-nuts] FE 5680A disciplined controller

The development phase of the FE 5680A disciplined controller is nearing its completion in no small part thanks to Scott's work on frequency/ temperature control. As I have pointed out in the past we have no plans to use the 5680 so Juerg is considering selling his FE5680A along with

[time-nuts] FE 5680A GPSDO update

First let me thank again Scott Newell for all the work he has done. The links included in this post where made possible by Scott. All three exceed the limit of time nuts but will give you a better understanding as to what is going on. First removing the 10 K resistor changes the Rb frequency

[time-nuts] FE 5680A GPSDO update second link problem

Some how a dot snuck in at the end of the second link after the s you can use the old link and delete the dot or use this one http://n5tnl.com/time/fe-5680a/gpsdo/JK5680A_Test35c.xls Sorry about that Bert Kehren ___ time-nuts mailing list --

Re: [time-nuts] FE-5680A sweep range setting

On 24/02/14 19:14, Paul Berger wrote: A couple further observations, to make life easier when adjusting C245 you can unplug the top card and move it aside, the CVXO will lock without it, but you will not have the 10MHz to monitor, but you can monitor the CVXO output instead. On the 6 pin

Re: [time-nuts] FE-5680A sweep range setting

Hi I am not at all sure that a mid setting on the VCXO is really the right thing to do. I’ve seen quite a few Rb’s from a number of manufacturers. They all seem to set up the sweep process so it sweeps fairly far low but not very far high. There are multiple quantum state transitions possible

Re: [time-nuts] FE-5680A sweep range setting

Hi Bob, On 01/03/14 16:55, Bob Camp wrote: Hi I am not at all sure that a mid setting on the VCXO is really the right thing to do. It's not really the right thing to do. You should trim it to one end so that further continuous drift makes trimming time longer than putting it at the mid.

Re: [time-nuts] FE-5680A sweep range setting

Hi I seem to recall that many of the bad transitions get ruled out for this or that reason. The number of “threats” isn’t as big as you might think. There is basically one close in transition and everything else is quite a bit further out. Bob On Mar 1, 2014, at 1:48 PM, Magnus Danielson

Re: [time-nuts] FE-5680A sweep range setting

On 3/01/14 11:35 AM, Magnus Danielson wrote: On 24/02/14 19:14, Paul Berger wrote: A couple further observations, to make life easier when adjusting C245 you can unplug the top card and move it aside, the CVXO will lock without it, but you will not have the 10MHz to monitor, but you can monitor

Re: [time-nuts] FE-5680A sweep range setting

A couple further observations, to make life easier when adjusting C245 you can unplug the top card and move it aside, the CVXO will lock without it, but you will not have the 10MHz to monitor, but you can monitor the CVXO output instead. On the 6 pin connector you will see a 1 near the outer

Re: [time-nuts] FE-5680A sweep range setting

OK ... I have C245 on the middle board, same as you. Tweaking it and ... Hmmm, it does affect the range (twitchy is an understatement!) but still no lock. To be continued Now by the 'frequency control board' do you mean the board that overlaps the top of the D-Sub connector? I have been

Re: [time-nuts] FE-5680A sweep range setting

Yes It took me several tries to find the spot, I only had success when I began only moving it in tiny increments I was not getting anywhere with 1/4 or 1/8 turn adjustments, and you should leave it a few minutes on each try when mine finally did lock is started at a little over 10MHz and then

Re: [time-nuts] FE-5680A sweep range setting

I also have a 5680A with that strange little board. On a hunch, I disconnected the orange wire and injected a DC voltage into the main board. It caused the frequency to change. I don't know if it's the C-field control or another mechanism, but the result is the same. Ed On 2/23/2014 4:01

Re: [time-nuts] FE-5680A sweep range setting

@gmail.com To: time-nuts@febo.com Subject: Re: [time-nuts] FE-5680A sweep range setting Message-ID: 5303b689.7070...@gmail.com Content-Type: text/plain; charset=ISO-8859-1; format=flowed Hi, I have a couple that look like the one in these pictures minus the the little frequency control board. http

Re: [time-nuts] FE-5680A sweep range setting

Hi, I have a couple that look like the one in these pictures minus the the little frequency control board. http://www.flickr.com/photos/14336723@N08/sets/72157632394339366/ One of mine would not lock so what I did I looked at my other 5680A which is the type referred to in the tip about C217

[time-nuts] FE-5680A sweep range setting

Hello everyone, I have a 5680 which is failing to lock. My DDS frequency is 8388608Hz, but it's sweeping between about 8388638 and 8388740. My unit has 3 levels of PCBs in the DDS/VCO corner and there is no trimcap labeled C217. Does anyone know how to adjust the sweep center frequency on

Re: [time-nuts] FE-5680A Loop Lock Indicator

: Saturday, September 21, 2013 9:24 PM Subject: Re: [time-nuts] FE-5680A Loop Lock Indicator Bob, I would bump that base resistor up a lot higher, to load the FE-5680 less. The PN has enough gain it only needs about 0.3 mA base drive to work as intended. You'd get that with a 10K

Re: [time-nuts] FE-5680A Loop Lock Indicator

Subject: Re: [time-nuts] FE-5680A Loop Lock Indicator Hi If you trace out the chip that drives the lock indicator it's got some sort of strange gating in it's supply pin. That gets you even less output than you would expect from a CMOS gate. I would not count on it putting out more than 1 ma at 5

Re: [time-nuts] FE-5680A Loop Lock Indicator

li...@rtty.us To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Sunday, September 22, 2013 6:31 AM Subject: Re: [time-nuts] FE-5680A Loop Lock Indicator Hi If you trace out the chip that drives the lock indicator it's got some sort of strange gating

Re: [time-nuts] FE-5680A Loop Lock Indicator

Subject: Re: [time-nuts] FE-5680A Loop Lock Indicator Hi Circuit should be: 2N with emitter to ground, collector to LED, base to lock indicator via the 4.7K resistor. The LED is hooked to +15 via another resistor. If you have ~ 10 ma in the LED then the base needs less than 0.1 ma to do

Re: [time-nuts] FE-5680A Loop Lock Indicator

, September 22, 2013 12:12 PM Subject: Re: [time-nuts] FE-5680A Loop Lock Indicator Hi Circuit should be: 2N with emitter to ground, collector to LED, base to lock indicator via the 4.7K resistor. The LED is hooked to +15 via another resistor. If you have ~ 10 ma in the LED then the base needs

Re: [time-nuts] FE-5680A Loop Lock Indicator

. From: Bob Stewart b...@evoria.net To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Sunday, September 22, 2013 12:27 PM Subject: Re: [time-nuts] FE-5680A Loop Lock Indicator Except that it doesn't work with even 1500 ohms in the base lead

Re: [time-nuts] FE-5680A Loop Lock Indicator

...@febo.com] On Behalf Of Bob Camp Sent: 22 September 2013 18:53 To: Bob Stewart; Discussion of precise time and frequency measurement Subject: Re: [time-nuts] FE-5680A Loop Lock Indicator Hi If you want 10 ma through the LED (which should be plenty) then the collector resistor would

Re: [time-nuts] FE-5680A Loop Lock Indicator

To: 'Discussion of precise time and frequency measurement' time-nuts@febo.com; 'Bob Stewart' b...@evoria.net Sent: Sunday, September 22, 2013 2:06 PM Subject: RE: [time-nuts] FE-5680A Loop Lock Indicator I have a circuit that seems to work well: The lock indicator is a weak source but a good sink so

Re: [time-nuts] FE-5680A Loop Lock Indicator

I'm surprised no one suggested using two 2N's in Darlington. Then a 22K or more from the base to the indicator pin would not load things down much. Collector load then 1.2K to 2k in series with the LED. Al, K9SI ___ time-nuts mailing list --

Re: [time-nuts] FE-5680A Loop Lock Indicator

Hi Al, This is just something quick and dirty.  At least it works and doesn't seem to be able to hurt anything. Bob From: Al Wolfe alw.k...@gmail.com To: time-nuts@febo.com Sent: Sunday, September 22, 2013 6:43 PM Subject: Re: [time-nuts] FE-5680A Loop

Re: [time-nuts] FE-5680A Loop Lock Indicator

From: Al Wolfe alw.k...@gmail.com To: time-nuts@febo.com Sent: Sunday, September 22, 2013 6:43 PM Subject: Re: [time-nuts] FE-5680A Loop Lock Indicator   I'm surprised no one suggested using two 2N's in Darlington. Then a 22K or more from the base

Re: [time-nuts] FE-5680A Loop Lock Indicator

/dokuwiki/doku.php?id=precision_timing:fe5680a_faq if you have not already seen it. Angus. From: Bob Stewart To: Time Nuts Sent: September 22, 2013 10:12 PM Subject: Re: [time-nuts] FE-5680A Loop Lock Indicator I hadn't thought of using a pullup resistor.  I'd have to get out the calculator

[time-nuts] FE-5680A Loop Lock Indicator

The instructions I got with this Rb said that you could hook an LED through a 5-10K resistor to the +15 supply and get a lock indication.  I'm using a 10K resistor and the LED lights as soon as it's powered up from cold.  Is the loop lock indicator circuit broken or is it just another strange

Re: [time-nuts] FE-5680A Loop Lock Indicator

-- From: Bob Stewart b...@evoria.net Sent: Saturday, September 21, 2013 10:55 AM To: Bob Stewart b...@evoria.net; Discussion of precise time and frequency measurement time-nuts@febo.com Subject: [time-nuts] FE-5680A Loop Lock Indicator The instructions I got with this Rb

Re: [time-nuts] FE-5680A Loop Lock Indicator

From: jmfranke jmfra...@cox.net To: Bob Stewart b...@evoria.net; Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Saturday, September 21, 2013 10:45 AM Subject: Re: [time-nuts] FE-5680A Loop Lock Indicator Are you applying +5V to pin as well? See: http

Re: [time-nuts] FE-5680A Loop Lock Indicator

If the lock output comes from the micro or a logic port with a maximum output of 3.3 or 5V, a LED connected to it from +15 will be always ON. On Sat, Sep 21, 2013 at 4:55 PM, Bob Stewart b...@evoria.net wrote: The instructions I got with this Rb said that you could hook an LED through a 5-10K

Re: [time-nuts] FE-5680A Loop Lock Indicator

of precise time and frequency measurement Subject: Re: [time-nuts] FE-5680A Loop Lock Indicator If the lock output comes from the micro or a logic port with a maximum output of 3.3 or 5V, a LED connected to it from +15 will be always ON. On Sat, Sep 21, 2013 at 4:55 PM, Bob Stewart b...@evoria.net wrote

Re: [time-nuts] FE-5680A Loop Lock Indicator

Hi As far as I know the lock output is a CMOS output that will drive a couple of ma. There are so many variations that yours may indeed be an open collector and good to +15 volts. Bob On Sep 21, 2013, at 10:55 AM, Bob Stewart b...@evoria.net wrote: The instructions I got with this Rb said

Re: [time-nuts] FE-5680A Loop Lock Indicator

measurement time-nuts@febo.com Sent: Saturday, September 21, 2013 3:00 PM Subject: Re: [time-nuts] FE-5680A Loop Lock Indicator Hi As far as I know the lock output is a CMOS output that will drive a couple of ma. There are so many variations that yours may indeed be an open collector and good

Re: [time-nuts] FE-5680A Loop Lock Indicator

: [time-nuts] FE-5680A Loop Lock Indicator Hi As far as I know the lock output is a CMOS output that will drive a couple of ma. There are so many variations that yours may indeed be an open collector and good to +15 volts. Bob On Sep 21, 2013, at 10:55 AM, Bob Stewart b...@evoria.net

Re: [time-nuts] FE-5680A Loop Lock Indicator

From: Bob Camp li...@rtty.us To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Saturday, September 21, 2013 4:12 PM Subject: Re: [time-nuts] FE-5680A Loop Lock Indicator Hi Those readings sound a lot more like a CMOS gate

Re: [time-nuts] FE-5680A Loop Lock Indicator

...@evoria.net Sent: Saturday, September 21, 2013 6:10 PM To: Discussion of precise time and frequency measurement time-nuts@febo.com Subject: Re: [time-nuts] FE-5680A Loop Lock Indicator Hi Bob, I hooked the big voltmeter up to it, and it shows +4.2V out for about a minute, and then goes to 0. Looking

Re: [time-nuts] FE-5680A Loop Lock Indicator

Subject: Re: [time-nuts] FE-5680A Loop Lock Indicator Yes, but put an isolation resistor between the output and the base of the transistor, something between 3K and 5K should work. The LED will light upon power on and extinguish when lock is achieved. John  WA4WDL

Re: [time-nuts] FE-5680A Loop Lock Indicator

...@evoria.net To: Time Nuts time-nuts@febo.com Sent: Saturday, September 21, 2013 10:02 PM Subject: Re: [time-nuts] FE-5680A Loop Lock Indicator Hi John, Thanks for the response.  I managed to cobble something up with LTSpiceIV, and get it to work.  And for me, that's saying something!    Here's what I

Re: [time-nuts] FE-5680A Loop Lock Indicator

From: Robert LaJeunesse rlajeune...@sbcglobal.net To: Bob Stewart b...@evoria.net; Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Saturday, September 21, 2013 9:24 PM Subject: Re: [time-nuts] FE-5680A Loop Lock Indicator Bob

Re: [time-nuts] FE-5680A Loop Lock Indicator

b...@evoria.net said: Is 3ma really that big a deal?  I know squat about CMOS gates.  I guess it is pulling the voltage down by 25%, though. There should be something in the data sheet. 1/2 :) If you trace the signal back the next time you have it open, you might be able to figure out

Re: [time-nuts] FE-5680A Voltage?

Hi The issue is the efficiency drop off as the voltage differential goes low. The ebay boards normally don't have any heat sinking on them. The LPRO pulls full current for quite a while when it warms up. Bob On Sep 12, 2013, at 10:40 PM, Orin Eman orin.e...@gmail.com wrote: Yes, my reading

[time-nuts] FE-5680A Voltage?

I decided to order a Rb standard, and I was wondering what the lower limit on the 15V power requirement is?  I have a PSU that will go up to 14.25V and my next closest is 18V.  Should I just get a new 15V PSU before this gets in?  Maybe I can make a quick mod on the big one and take it up to

Re: [time-nuts] FE-5680A Voltage?

Hi As I recall, 15 volts is sort of the minimum they recommend on most of the variations of the 5680. The internal regulators will probably be happier with 18 volts than with 14.25. You best bet is indeed a 15 V supply. Bob On Sep 12, 2013, at 11:03 AM, Bob Stewart b...@evoria.net wrote: I

Re: [time-nuts] FE-5680A Voltage?

, 2013 4:52 PM Subject: Re: [time-nuts] FE-5680A Voltage? Hi As I recall, 15 volts is sort of the minimum they recommend on most of the variations of the 5680. The internal regulators will probably be happier with 18 volts than with 14.25. You best bet is indeed a 15 V supply. Bob

Re: [time-nuts] FE-5680A Voltage?

From: Bob Camp li...@rtty.us To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Thursday, September 12, 2013 4:52 PM Subject: Re: [time-nuts] FE-5680A Voltage? Hi As I recall, 15 volts is sort of the minimum they recommend on most of the variations

Re: [time-nuts] FE-5680A Voltage?

From: paul swed paulsw...@gmail.com To: Bob Stewart b...@evoria.net; Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Thursday, September 12, 2013 5:31 PM Subject: Re: [time-nuts] FE-5680A Voltage? A good supply is desirable wall

Re: [time-nuts] FE-5680A Voltage?

12, 2013 5:31 PM Subject: Re: [time-nuts] FE-5680A Voltage? A good supply is desirable wall warts aren't. Enjoy your new Rb Regards Paul WB8TSL On Thu, Sep 12, 2013 at 6:01 PM, Bob Stewart b...@evoria.net wrote: Thanks Bob. I looked at the datasheet again and found that they do

Re: [time-nuts] FE-5680A Voltage?

and frequency measurement time-nuts@febo.com Sent: Thursday, September 12, 2013 4:52 PM Subject: Re: [time-nuts] FE-5680A Voltage? Hi As I recall, 15 volts is sort of the minimum they recommend on most of the variations of the 5680. The internal regulators will probably be happier with 18 volts

Re: [time-nuts] FE-5680A Voltage?

12, 2013 4:52 PM Subject: Re: [time-nuts] FE-5680A Voltage? Hi As I recall, 15 volts is sort of the minimum they recommend on most of the variations of the 5680. The internal regulators will probably be happier with 18 volts than with 14.25. You best bet is indeed a 15 V supply. Bob

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