Re: [time-nuts] 10811 changing frequency when load impedance changes ?
Mark Spencer wrote: Thanks.I'll have to do some more experimenting, in one case I was feeding the time base output of the 5328A into a 1 meg scope input, and using the scope to compare the frequency to my thunderbolt, in the other case I was feeding the time base output into my 5370B set to 50 ohms and using the time interval function of the counter to compare the frquency to the thunderbolt. I couldn't figure out why I was seeing different frequency results on the scope and the 5370B untill i put a 50 ohm terminator in paralel with the scope input then things made sense. I'll try altering the load impedance along the lines shown in the specs and see what the results are.I also noticed that the wave form on the scope was very dirty (ie the peaks were very hard to see), and it cleaned up to a more or less sine wave when I added the 50 ohm terminator, perhaps the 5328A is not properly terminating the 10811. The 10811 seems stable so long as the load impedance does not change so it may still be useable. I'm also wondering if I was getting some injection locking when I was comparing the frequency using the scope, the results seemed very very good, almost to good and the cable between the scope and the 5328A was not seeing 50 ohms at either end which probably wasn't helping either. My elcheapo pre made RG58 patch cords of un known shielding probably aren't helping either. I'll have to make up some proper patch cords using some double shieled cable I've stashed away. - Original Message From: Bruce Griffithsbruce.griffi...@xtra.co.nz To: Discussion of precise time and frequency measurementtime-nuts@febo.com Sent: Fri, December 24, 2010 10:42:46 PM Subject: Re: [time-nuts] 10811 changing frequency when load impedance changes ? Bruce Griffiths wrote: Mark Spencer wrote: Seasons greetings. I was pleasantly surprised to find that a new to me HP 5328A had an 10811 in it.(I was expecting the older OCXO..)After leaving it running for a week I adjusted the frequency and while doing so I noticed that the out put frequency changes by a third of a hz or so if I add or remove a 50 ohm load. I'm measuring the frequency at the timebase output connection of the 5328A. Is this to be expected ? Many thanks Mark Spencer ___ 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, that seems to be a couple of orders of magnitude larger than the specs for the 10811A would lead one to believe. Maybe there's a problem with the output buffer amp in the 10811A? Bruce The spec for the 10811A actually states that the shift is 5E-10 (5mHz) for a 10% (5 ohm) change in a 50 ohm load and a for a 25% change (250 ohm) in a 1K load A naive extrapolation would suggest a shift of around 20mHz for a 50 ohm to 1K load change your frequency shift (333mHz) is about 15x this. However the 10811A is notorious for injection locking if the reverse isolation of the external circuitry is inadequate. Bruce The 5328 terminates the OCXO output in 1200 ohms so that its compatible with the predecessor OCXO a 10544 (I believe ) which had an emitter follower output and could only drive a 1K load. There is a multiplexer chip after the 1k2 load in the 5328. A poor waveform with a 1k2 load implies that either the multiplexer input is clamping the signal or maybe the 511 ohm resistor across the output transformer in the 1811A has gone open circuit? Alternatively the power supply for the 10811A output buffer is too low? The output buffer device could be entering saturation if the 511 ohm resistor is open circuit or the output buffer stage collector supply is too low. Repairing the 10811A isn't too difficult unlike the 10544A (although even that is possible). 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] how to open a Trimble mushroom ?
Hi Pete, That is the same case as the Palisade. I've opened one before. It looks like it should unclip but does not. The two halves do clip together, but there is a gutter inside the circumference of the lower half that a molded edge of the top fits into. They fill the gutter with epoxy before clipping them together. I had to cut through the top to open it. It had a curved crossed dipole antenna and a GPS RX on a PCB. All highly inegrated. Have you tried powering it up using the Palisade / accutime connection info and montitoring the data pins? Happy Holidays, Robert G8RPI. --- On Fri, 24/12/10, Pete Lancashire p...@petelancashire.com wrote: From: Pete Lancashire p...@petelancashire.com Subject: [time-nuts] how to open a Trimble mushroom ? To: Discussion of precise time and frequency measurement time-nuts@febo.com Date: Friday, 24 December, 2010, 22:00 More goodies from storage I have a few 'special' Trimble mushroom GPS's. I'm trying to open one up but can't seem to get very far. I've pulled all the tabs out but still can't pry the case open. They interface between the two sections doesn't look welded or glued. Here a couple picts http://petelancashire.com/gallery/main.php?g2_itemId=21208 The data on these guys was trashed long ago when the company closed up. I could not locate it anywhere. ___ 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] 10811 changing frequency when load impedance changes ?
Mark, On 12/25/2010 06:54 AM, Mark Spencer wrote: Seasons greetings. I was pleasantly surprised to find that a new to me HP 5328A had an 10811 in it.(I was expecting the older OCXO..) After leaving it running for a week I adjusted the frequency and while doing so I noticed that the out put frequency changes by a third of a hz or so if I add or remove a 50 ohm load. I'm measuring the frequency at the timebase output connection of the 5328A. Is this to be expected ? Look at the signal with a scope and either change the impedance on the scope or by letting it sniff the coax as it goes to whatever can handle it. Sometimes reflections in cables can cause extra transitions for a counter. That's why I seem to like to have a scope around when using counters to verify the signal. In practice not all sources in a lab is capable of driving 50 Ohm so it is not as simple as always terminating correctly. The board that sticks in between the 5328A motherboard and the 10811A has a driver for frequency output which does not give a nice and clean output on high-impedance loads, but it gives nice and sharp transitions, in fact the falling transition is at 160 MV/s and your best bet. BTW, I love that my 5335A has slew rate measurement built-in. :) 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.
Re: [time-nuts] how to open a Trimble mushroom ?
I knew I was not the first :-) ! I was willing to sacrifice this one since it was marked intermittent and I have a total of five. Three of the other four are still in sealed bags. As to powering up, I've not yet located any of the cables. I do have foggy memories of there being some at least 50' maybe 100'. Their GPS need was only 1 PPS, why the special I don't know. Thanks ! -pete On Sat, Dec 25, 2010 at 2:08 AM, Robert Atkinson robert8...@yahoo.co.uk wrote: Hi Pete, That is the same case as the Palisade. I've opened one before. It looks like it should unclip but does not. The two halves do clip together, but there is a gutter inside the circumference of the lower half that a molded edge of the top fits into. They fill the gutter with epoxy before clipping them together. I had to cut through the top to open it. It had a curved crossed dipole antenna and a GPS RX on a PCB. All highly inegrated. Have you tried powering it up using the Palisade / accutime connection info and montitoring the data pins? Happy Holidays, Robert G8RPI. --- On Fri, 24/12/10, Pete Lancashire p...@petelancashire.com wrote: From: Pete Lancashire p...@petelancashire.com Subject: [time-nuts] how to open a Trimble mushroom ? To: Discussion of precise time and frequency measurement time-nuts@febo.com Date: Friday, 24 December, 2010, 22:00 More goodies from storage I have a few 'special' Trimble mushroom GPS's. I'm trying to open one up but can't seem to get very far. I've pulled all the tabs out but still can't pry the case open. They interface between the two sections doesn't look welded or glued. Here a couple picts http://petelancashire.com/gallery/main.php?g2_itemId=21208 The data on these guys was trashed long ago when the company closed up. I could not locate it anywhere. ___ 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] how to open a Trimble mushroom ?
Seem to recall they may be rs422. On Sat, Dec 25, 2010 at 10:37 AM, Pete Lancashire p...@petelancashire.comwrote: I knew I was not the first :-) ! I was willing to sacrifice this one since it was marked intermittent and I have a total of five. Three of the other four are still in sealed bags. As to powering up, I've not yet located any of the cables. I do have foggy memories of there being some at least 50' maybe 100'. Their GPS need was only 1 PPS, why the special I don't know. Thanks ! -pete On Sat, Dec 25, 2010 at 2:08 AM, Robert Atkinson robert8...@yahoo.co.uk wrote: Hi Pete, That is the same case as the Palisade. I've opened one before. It looks like it should unclip but does not. The two halves do clip together, but there is a gutter inside the circumference of the lower half that a molded edge of the top fits into. They fill the gutter with epoxy before clipping them together. I had to cut through the top to open it. It had a curved crossed dipole antenna and a GPS RX on a PCB. All highly inegrated. Have you tried powering it up using the Palisade / accutime connection info and montitoring the data pins? Happy Holidays, Robert G8RPI. --- On Fri, 24/12/10, Pete Lancashire p...@petelancashire.com wrote: From: Pete Lancashire p...@petelancashire.com Subject: [time-nuts] how to open a Trimble mushroom ? To: Discussion of precise time and frequency measurement time-nuts@febo.com Date: Friday, 24 December, 2010, 22:00 More goodies from storage I have a few 'special' Trimble mushroom GPS's. I'm trying to open one up but can't seem to get very far. I've pulled all the tabs out but still can't pry the case open. They interface between the two sections doesn't look welded or glued. Here a couple picts http://petelancashire.com/gallery/main.php?g2_itemId=21208 The data on these guys was trashed long ago when the company closed up. I could not locate it anywhere. ___ 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] Us Time Nuts and... Wrist Watches.
On 24/12/10 17:00, Michael Poulos wrote: What is your favorite watch? This one gets my vote: http://leapsecond.com/pages/atomic-bill/ -- Linux 2.6.35 ___ 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] Us Time Nuts and... Wrist Watches.
Hi Michael: I like my Suunto Vector Wrist Computer. It's the Swiss Army knife of watches. Has Date, Time, Alarms, stopwatch, etc plus barometer, altimeter, thermometer, bubble level . . . . http://www.prc68.com/I/Watch-Real-Fake.shtml#SVWC - watch http://www.prc68.com/I/PT.html - Swiss Army Knife Have Fun, Brooke Clarke http://www.PRC68.com Michael Poulos wrote: We all enjoy good accurate time keeping. :) What is your favorite watch? My watch (so far) is a Casio WaveCeptor digital watch that gets the WWVB signal and calibrates itself that I bought for $50 at a WalMart - the price of one Chicago parking ticket. Less than half a second off at any time, it is plenty accurate. The one exact drawback is that during night driving, you can't read it when you need to check the time. The lesser drawback is that it is not dressy. A nice dressy radio controlled watch would be that Citizen EcoDrive watch shown on those adverts during football games. If it has glow in the dark hands and 5 minute markers it would be great if expensive. So, let's have it with the best watch for a time nut! (not including Tom van Baak's REAL atomic watch) ___ 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] Us Time Nuts and... Wrist Watches
Hah! On 12/25/2010 12:22 PM, Eamon Skelton wrote: On 24/12/10 17:00, Michael Poulos wrote: What is your favorite watch? This one gets my vote: http://leapsecond.com/pages/atomic-bill/ ___ 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 to open a Trimble mushroom ?
Seem to recall they may be rs422. Trimble has/had at least 2 units like that: Palisade and Acutime. There have been several variations of the Acutime. Trimble had a development kit for the Palisade. It was a little box with RS-422 to RS-232 converters, a DB-25 on the back, 2 DE-9s and a BNC on the front. (and cables and such) ftp://ftp.trimble.com/pub/sct/embedded/bin/Manuals/Old%20Manuals/PALISADE.PD F There are 5 signals: PPS Tx-A, Rx-A Tx-B, Rx-B The B channel is reasonably normal. You can send and receive messages. The A channel is different. The Tx (to Palisade) signal is for timing, not data. The development kit wires it up to one of the modem control signals. When you flap that signal, it sends you back a message with the time that the signal flapped. If your RS-422/232 converter wired Tx-Tx, you can send a null byte. -- 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] Question on GPS and reference standards
Phase-locked Loop Circuit Design H. Wolaver: http://www.on4jln.be/pll_wolaver.pdf The long does not open as it should. Infact, when poking around your homepage it seems like several links has the same effect... not found. I found it on his site. Try this link. http://www.on4jln.be/infos/pll_wolaver = 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] how to open a Trimble mushroom ?
yep i found enough searching around that once I find one of the cables, I can see what happens. Thanks !! -pete On Sat, Dec 25, 2010 at 1:13 PM, Robert Atkinson robert8...@yahoo.co.uk wrote: hi Pete, If you search the archive you should find a old email with the connector part number. They are normally RS422 out. Regards, Robert. --- On Sat, 25/12/10, Pete Lancashire p...@petelancashire.com wrote: From: Pete Lancashire p...@petelancashire.com Subject: Re: [time-nuts] how to open a Trimble mushroom ? To: Discussion of precise time and frequency measurement time-nuts@febo.com Date: Saturday, 25 December, 2010, 15:37 I knew I was not the first :-) ! I was willing to sacrifice this one since it was marked intermittent and I have a total of five. Three of the other four are still in sealed bags. As to powering up, I've not yet located any of the cables. I do have foggy memories of there being some at least 50' maybe 100'. Their GPS need was only 1 PPS, why the special I don't know. Thanks ! -pete On Sat, Dec 25, 2010 at 2:08 AM, Robert Atkinson robert8...@yahoo.co.uk wrote: Hi Pete, That is the same case as the Palisade. I've opened one before. It looks like it should unclip but does not. The two halves do clip together, but there is a gutter inside the circumference of the lower half that a molded edge of the top fits into. They fill the gutter with epoxy before clipping them together. I had to cut through the top to open it. It had a curved crossed dipole antenna and a GPS RX on a PCB. All highly inegrated. Have you tried powering it up using the Palisade / accutime connection info and montitoring the data pins? Happy Holidays, Robert G8RPI. --- On Fri, 24/12/10, Pete Lancashire p...@petelancashire.com wrote: From: Pete Lancashire p...@petelancashire.com Subject: [time-nuts] how to open a Trimble mushroom ? To: Discussion of precise time and frequency measurement time-nuts@febo.com Date: Friday, 24 December, 2010, 22:00 More goodies from storage I have a few 'special' Trimble mushroom GPS's. I'm trying to open one up but can't seem to get very far. I've pulled all the tabs out but still can't pry the case open. They interface between the two sections doesn't look welded or glued. Here a couple picts http://petelancashire.com/gallery/main.php?g2_itemId=21208 The data on these guys was trashed long ago when the company closed up. I could not locate it anywhere. ___ 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] Us Time Nuts and... Wrist Watches.
My favorite watches all use the 7T32 calibre from Seiko. I have 4 at the moment. This calibre is quite accurate enough (the drift is minimum, considering this quartz analog has to be readjusted every 2 months anyway (calendar is 31 days/month). It has a second hand, calendar, a very convenient alarm and also stopwatch functions, in a very elegant package. It is the only quartz analog watch I know that has 3 buttons and two crowns, so the user interface is quite friendly. I have never actually measured the drift rate, but it would be interesting to compare the four and see how well they track each others. Didier KO4BB Sent from my Verizon Wireless BlackBerry -Original Message- From: Michael Poulos poulo...@gmail.com Sender: time-nuts-boun...@febo.com Date: Fri, 24 Dec 2010 11:00:53 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: [time-nuts] Us Time Nuts and... Wrist Watches. We all enjoy good accurate time keeping. :) What is your favorite watch? My watch (so far) is a Casio WaveCeptor digital watch that gets the WWVB signal and calibrates itself that I bought for $50 at a WalMart - the price of one Chicago parking ticket. Less than half a second off at any time, it is plenty accurate. The one exact drawback is that during night driving, you can't read it when you need to check the time. The lesser drawback is that it is not dressy. A nice dressy radio controlled watch would be that Citizen EcoDrive watch shown on those adverts during football games. If it has glow in the dark hands and 5 minute markers it would be great if expensive. So, let's have it with the best watch for a time nut! (not including Tom van Baak's REAL atomic watch) ___ 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] Speaking of counters...
What is the groups thoughts on the HP 5345A? I have one that I use as a general purpose counter and it seems to do a fine job. I like the ability to count low frequencies fast, although sometimes I notice some dithering in the count that I'm attributing to issues in the counter itself rather than my known source. Burt, K6OQK Burt I. Weiner Associates Broadcast Technical Services Glendale, California U.S.A. b...@att.net www.biwa.cc K6OQK ___ 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] Speaking of counters...
Have 3 of them and use them reasonably often also have the 3 Ghz converters on 2 of them. They work and seem to last. Regards Paul WB8TSL On Sat, Dec 25, 2010 at 6:17 PM, Burt I. Weiner b...@att.net wrote: What is the groups thoughts on the HP 5345A? I have one that I use as a general purpose counter and it seems to do a fine job. I like the ability to count low frequencies fast, although sometimes I notice some dithering in the count that I'm attributing to issues in the counter itself rather than my known source. Burt, K6OQK Burt I. Weiner Associates Broadcast Technical Services Glendale, California U.S.A. b...@att.net www.biwa.cc K6OQK ___ 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] Speaking of counters...
other then big, noisy and somewhat of a power hog, they to me are one of the best bargains out there if you don't have a big budget. HP Journal that talks about them http://www.hparchive.com/Journals/HPJ-1974-06.pdf if your not in a hurry and you use GPIB or think you will in the future, look for option 12. I have seen fully working 5345As go for as little as $25 on the E. One day I went to do a local pickup of a piece of Tek gear and the guy had about 10 5345A's all not working from a DOD sale. I went home with a full pickup for $50. 001 - Room Temperature Time Base 010 - General Purpose Interface ( gpib format, talk only) 011 - General Purpose Interface (Digital I/O plus control of all functions except input amplifier) 012 - General Purpose Interface (similar to option 011, but adds slope and level control) Where I will never give mine up is the combination of the 5355A plug-in and one of the 5356A/B/C heads. It brings the counters input as close as you want to your work. You do have to be careful on getting a non damaged head There is 5245A that will take you to 4Ghz. and an App note http://www.hpmemory.org/an/pdf/an_173.pdf Lastly there is the HP10590A plug-in adapter that lets you use the 5245 plug-ins. For me I use the Video plug-in and one that I made myself from a gutted one. Lastly there are S/N ranges but I can't remember them .. -pete On Sat, Dec 25, 2010 at 3:17 PM, Burt I. Weiner b...@att.net wrote: What is the groups thoughts on the HP 5345A? I have one that I use as a general purpose counter and it seems to do a fine job. I like the ability to count low frequencies fast, although sometimes I notice some dithering in the count that I'm attributing to issues in the counter itself rather than my known source. Burt, K6OQK Burt I. Weiner Associates Broadcast Technical Services Glendale, California U.S.A. b...@att.net www.biwa.cc K6OQK ___ 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] Speaking of counters...
Well you have sighted all the wizmos that I also have and use. As I say they work and have been working for4 a long time. Regards On Sat, Dec 25, 2010 at 9:04 PM, Pete Lancashire p...@petelancashire.comwrote: other then big, noisy and somewhat of a power hog, they to me are one of the best bargains out there if you don't have a big budget. HP Journal that talks about them http://www.hparchive.com/Journals/HPJ-1974-06.pdf if your not in a hurry and you use GPIB or think you will in the future, look for option 12. I have seen fully working 5345As go for as little as $25 on the E. One day I went to do a local pickup of a piece of Tek gear and the guy had about 10 5345A's all not working from a DOD sale. I went home with a full pickup for $50. 001 - Room Temperature Time Base 010 - General Purpose Interface ( gpib format, talk only) 011 - General Purpose Interface (Digital I/O plus control of all functions except input amplifier) 012 - General Purpose Interface (similar to option 011, but adds slope and level control) Where I will never give mine up is the combination of the 5355A plug-in and one of the 5356A/B/C heads. It brings the counters input as close as you want to your work. You do have to be careful on getting a non damaged head There is 5245A that will take you to 4Ghz. and an App note http://www.hpmemory.org/an/pdf/an_173.pdf Lastly there is the HP10590A plug-in adapter that lets you use the 5245 plug-ins. For me I use the Video plug-in and one that I made myself from a gutted one. Lastly there are S/N ranges but I can't remember them .. -pete On Sat, Dec 25, 2010 at 3:17 PM, Burt I. Weiner b...@att.net wrote: What is the groups thoughts on the HP 5345A? I have one that I use as a general purpose counter and it seems to do a fine job. I like the ability to count low frequencies fast, although sometimes I notice some dithering in the count that I'm attributing to issues in the counter itself rather than my known source. Burt, K6OQK Burt I. Weiner Associates Broadcast Technical Services Glendale, California U.S.A. b...@att.net www.biwa.cc K6OQK ___ 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] Speaking of counters...
Burt wrote: What is the groups thoughts on the HP 5345A? I have several and like them, aside from the screaming switching power supplies that will give you a splitting headache in 5-10 minutes. Even the very loud fan (as loud as a 3585A spectrum analyzer, which sounds like a 757 taking off) doesn't mask the awful switcher din. There are two switchers (+/- 5 V), and the oscillators are not synchronized, so they beat with each other. Unquestionably the most obnoxious noisemakers I've ever experienced. Some parts are getting hard to come by. Speaking of the fan, note that HP strongly recommends removing the air filters, if they are still present. Best regards, Charles ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] Speaking of Counters...
Gang, Thanks for the input. I never seem to hear any discussion about the 5345A so I thought that maybe there was something about the HP-5345A's that was not in favor - for some reason. Glad to know that's not the case. I paid about $300 for my 5345A about 8 or so years ago with a complete service manual. It was working when I got it and it has the Hi-Stab oscillator. I've had it apart a few times to clean, edge connectors and all, and I think it's about time for that again. This time I'm going to replace the fan. It's starting to become noisier than just high velocity noise. I used to have a HP-5425A and still have 3 or 4 plug in's from it. I see one of the adaptors on eBay that looks pretty clean for $495. What is a fair price for the adaptor? Thanks again for your input. Burt, K6OQK From: Pete Lancashire p...@petelancashire.com Subject: Re: [time-nuts] Speaking of counters... other then big, noisy and somewhat of a power hog, they to me are one of the best bargains out there if you don't have a big budget. HP Journal that talks about them http://www.hparchive.com/Journals/HPJ-1974-06.pdf if your not in a hurry and you use GPIB or think you will in the future, look for option 12. I have seen fully working 5345As go for as little as $25 on the E. One day I went to do a local pickup of a piece of Tek gear and the guy had about 10 5345A's all not working from a DOD sale. I went home with a full pickup for $50. 001 - Room Temperature Time Base 010 - General Purpose Interface ( gpib format, talk only) 011 - General Purpose Interface (Digital I/O plus control of all functions except input amplifier) 012 - General Purpose Interface (similar to option 011, but adds slope and level control) Where I will never give mine up is the combination of the 5355A plug-in and one of the 5356A/B/C heads. It brings the counters input as close as you want to your work. You do have to be careful on getting a non damaged head There is 5245A that will take you to 4Ghz. and an App note http://www.hpmemory.org/an/pdf/an_173.pdf Lastly there is the HP10590A plug-in adapter that lets you use the 5245 plug-ins. For me I use the Video plug-in and one that I made myself from a gutted one. Lastly there are S/N ranges but I can't remember them .. -pete On Sat, Dec 25, 2010 at 3:17 PM, Burt I. Weiner b...@att.net wrote: What is the groups thoughts on the HP 5345A? ?I have one that I use as a general purpose counter and it seems to do a fine job. ?I like the ability to count low frequencies fast, although sometimes I notice some dithering in the count that I'm attributing to issues in the counter itself rather than my known source. Burt, K6OQK Burt I. Weiner Associates Broadcast Technical Services Glendale, California U.S.A. b...@att.net www.biwa.cc K6OQK ___ 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.
