Re: [time-nuts] HP-10811AB-OCXO interface questions
Wow, thanks for all the information. Thanks Bruce Griffiths, the LTC6957 is expensive but looks very good for sine to square wave conversion. Thanks Lester Veenstra for the details on some of the devices on the interface PCA and the link to the TLV3501 signal conditioning module. Thanks Bob kb8tq for the info and comments to each question. Glenn Little WB4UIV, I think that I might recover and reuse the OCXO connector from the interface PCAs. If you are still interested I can send you the PCAs minus those connectors for the cost of the postage, email me directly. Thanks Dave M for the detailed part number references. Thanks Ed Breya, Dan Rae and Charles Steinmetz. Useful to know where the interface PCA and OCXO were originally from and where more info can be found. Thanks Steve Longcor for digging up the interface PCA schematic. Looks like I have a bit of reading, designing and building to do now. :-) Cheers -- Manfred VK3AES ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] HP-10811AB-OCXO interface questions
Missing body of my previous message (I hope): As others have said, there are a number of versions of the 5328A oscillator support board. Yours looks like it is from a MIL version of the 5328A with the 10811 OCXO. Attached is the most-likely schematic, which is from the manual for the 5328AH99 TRI-SERVICE COUNTER found in Keysight obsolete products: https://www.keysight.com/en/pd-5328AH99%3Aepsg%3Apro-pn-5328AH99/tri-service-counter?pm=PL Steve On 9/1/2020 10:24 PM, Manfred Bartz wrote: Hi all, I bought 2 x 10811 OCXOs for a 10MHz GPSDO project I am working on. The OCXOs came with an interface board HP 05328-20027, see attached pictures. Questions: 1. Is it worth keeping the interface board? a. If yes, does anyone have the schematic and the data on the ICs? b. What is that TO220 device? and c. why is it mounted on a standoff on the back of the PCB? 2. Any advice/caution on matching the OCXO output impedance? 3. Any recommendation for a (>= 4-ch) distribution amplifier? 4. Any advice on a low jitter comparator for further digital processing, e.g. for a 1pps signal? Thanks and 73 ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] HP-10811AB-OCXO interface questions
On 9/1/2020 10:24 PM, Manfred Bartz wrote: Hi all, I bought 2 x 10811 OCXOs for a 10MHz GPSDO project I am working on. The OCXOs came with an interface board HP 05328-20027, see attached Manfred, the -hp- system of numbering would indicate that this was from a 5328 counter. There are two versions of that board on the ko4bb site, not identical, but they may be of some help. Dan ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] HP-10811AB-OCXO interface questions
Manfred wrote: I bought 2 x 10811 OCXOs for a 10MHz GPSDO project I am working on. The OCXOs came with an interface board HP 05328-20027, see attached pictures. The 05328-20027 "Oscillator Support Assembly" (also, the 05328-60027 "Oscillator Support Assembly") was used to interface an HP 10544A OCXO (predecessor to the 10811 OCXO) to an HP 5328A frequency counter. It contains two voltage regulators, an amplifier chain to enable the external standard input on the 5328, and a 10:1 divider to generate a 1MHz output in addition to the 10MHz output. A similar "Oscillator Support Assembly", HP 05328-60038, was used to interface an HP 10811 OCXO to the HP 5328A frequency counter. There was also an earlier "Oscillator Support Board", HP 05328-60018, which contains only the voltage regulator. Schematics for all of the oscillator support boards can be found in various generations of the HP 5328A service manual, which are easily found on line. Best regards, Charles ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] HP-10811AB-OCXO interface questions
Manfred, The 05328-20027 part number is the HP part number for the bare PCB used in the A3 assembly 05328-60027 interface board. You can find the schematic for that assembly in the manual for the militarized version of the 5328A (AN/USM-459) at [ https://radionerds.com/images/9/9a/TM_11-6625-2941-14%26P.PDF | https://radionerds.com/images/9/9a/TM_11-6625-2941-14%26P.PDF ] and the associated manual [ https://www.liberatedmanuals.com/TM-11-6625-2941-24P.pdf. | https://www.liberatedmanuals.com/TM-11-6625-2941-24P.pdf. ] . Cheers, Dave M From: "Manfred Bartz" To: "Discussion of precise time and frequency measurement" Sent: Wednesday, September 2, 2020 12:24:21 AM Subject: [time-nuts] HP-10811AB-OCXO interface questions Hi all, I bought 2 x 10811 OCXOs for a 10MHz GPSDO project I am working on. The OCXOs came with an interface board HP 05328-20027, see attached pictures. Questions: 1. Is it worth keeping the interface board? a. If yes, does anyone have the schematic and the data on the ICs? b. What is that TO220 device? and c. why is it mounted on a standoff on the back of the PCB? 2. Any advice/caution on matching the OCXO output impedance? 3. Any recommendation for a (>= 4-ch) distribution amplifier? 4. Any advice on a low jitter comparator for further digital processing, e.g. for a 1pps signal? Thanks and 73 -- Manfred VK3AES ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] HP-10811AB-OCXO interface questions
Look in the HP5328A counter manual for the circuit - that's what this came from, indicated by the board marking. Seems like an awful lot of extra circuitry to support the OCXO. The only thing I can think of offhand is it may be a PLL circuit to allow locking to an external reference. You'll probably find it not needed or wanted for a fresh GPSDO system, but save the connector to go with the 10811. Ed ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] HP-10811AB-OCXO interface questions
Hi That interface board *may* use a biased transistor to convert sine to square. It’s been a while since I looked at it ….. Bob > On Sep 2, 2020, at 10:00 AM, Mike Feher wrote: > > I remember the days when we had to build our own discrete Schmitt trigger to > do this. 73 - Mike > > Mike B. Feher, N4FS > 89 Arnold Blvd. > Howell NJ 07731 > 848-245-9115 > > -Original Message- > From: time-nuts On Behalf Of Bruce > Griffiths > Sent: Wednesday, September 2, 2020 1:46 AM > To: Discussion of precise time and frequency measurement > > Subject: Re: [time-nuts] HP-10811AB-OCXO interface questions > > For sine to square wave conversion use LTC6957 (select variant to suit > following logic). > > > Bruce > > > > ___ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] HP-10811AB-OCXO interface questions
Ordered a bunch of these to test against the TAPR device https://www.aliexpress.com/item/4001231758949.html?spm=a2g0s.9042311.0.0.151 84c4d1hMhZs TLV3501 Single Chan High Speed Comparator Frequency Meter Front Shaping Module DC 2.7-5V Frequency Counter SMA Specifications: Supply voltage: 2.7-5VDC Input voltage: 8-1000mV (effective value) Output level: rail to rail output, can directly TTL / CMOS level Input frequency: 1Hz-120 MHz, Min.1Hz shape: SMA female head (external screw hole) Input impedance: 20 K ohm Product Use: Sine wave The zero crossing comparator comparator Colour:green Material:metal Size:about 5*2.5cm Lester B Veenstra K1YCM MØYCM W8YCM 6Y6Y les...@veenstras.com 452 Stable Ln (HC84 RFD USPS Mail) Keyser WV 26726 GPS: 39.336826 N 78.982287 W (Google) GPS: 39.33682 N 78.9823741 W (GPSDO) Telephones: Home: +1-304-289-6057 US cell +1-304-790-9192 Jamaica cell: +1-876-456-8898 -Original Message- From: time-nuts [mailto:time-nuts-boun...@lists.febo.com] On Behalf Of Mike Feher Sent: Wednesday, September 02, 2020 10:01 AM To: 'Discussion of precise time and frequency measurement' Subject: Re: [time-nuts] HP-10811AB-OCXO interface questions I remember the days when we had to build our own discrete Schmitt trigger to do this. 73 - Mike Mike B. Feher, N4FS 89 Arnold Blvd. Howell NJ 07731 848-245-9115 -Original Message- From: time-nuts On Behalf Of Bruce Griffiths Sent: Wednesday, September 2, 2020 1:46 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] HP-10811AB-OCXO interface questions For sine to square wave conversion use LTC6957 (select variant to suit following logic). Bruce ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] HP-10811AB-OCXO interface questions
I remember the days when we had to build our own discrete Schmitt trigger to do this. 73 - Mike Mike B. Feher, N4FS 89 Arnold Blvd. Howell NJ 07731 848-245-9115 -Original Message- From: time-nuts On Behalf Of Bruce Griffiths Sent: Wednesday, September 2, 2020 1:46 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] HP-10811AB-OCXO interface questions For sine to square wave conversion use LTC6957 (select variant to suit following logic). Bruce ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] HP-10811AB-OCXO interface questions
Hi > On Sep 2, 2020, at 1:24 AM, Manfred Bartz wrote: > > Hi all, > > I bought 2 x 10811 OCXOs for a 10MHz GPSDO project I am working on. > The OCXOs came with an interface board HP 05328-20027, see attached > pictures. > > Questions: > 1. Is it worth keeping the interface board? They make an adequate “burn in” board. There isn’t a lot of use for them otherwise. >a. If yes, does anyone have the schematic and the data on the ICs? You can trace it out. It’s an ECL doubler or something like that. >b. What is that TO220 device? It’s the 12V regulator to drive the oscillator. The 10811 uses > 20V for the oven and ~ 12V for the oscillator > and >c. why is it mounted on a standoff on the back of the PCB? It shipped that way to keep it safe. It mounts on the chassis of the instrument this board plugged into. > 2. Any advice/caution on matching the OCXO output impedance? 10811 is designed to run into a 50 ohm or 1K ohm load. Most run them into a 50 ohm load. > 3. Any recommendation for a (>= 4-ch) distribution amplifier? Depends a lot on what you are after. I did a post of some op-amp data back a few months. None of them would “preserve” the far removed phase noise of the 10811. > 4. Any advice on a low jitter comparator for further digital processing, > e.g. for a 1pps signal? The previous post about the LTC part is one way to go. A simple biased gate (like that used on the interface board) is another way. A lot depends on just how low “low jitter” needs to be. Bob > > Thanks and 73 > -- > Manfred VK3AES > ___ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] HP-10811AB-OCXO interface questions
For sine to square wave conversion use LTC6957 (select variant to suit following logic). Bruce > On 02 September 2020 at 17:24 Manfred Bartz mailto:vk3...@gmail.com > wrote: > > > Hi all, > > I bought 2 x 10811 OCXOs for a 10MHz GPSDO project I am working on. > The OCXOs came with an interface board HP 05328-20027, see attached > pictures. > > Questions: >1. Is it worth keeping the interface board? > > a. If yes, does anyone have the schematic and the data on the ICs? > b. What is that TO220 device? and > c. why is it mounted on a standoff on the back of the PCB? >1. Any advice/caution on matching the OCXO output impedance? >2. Any recommendation for a (>= 4-ch) distribution amplifier? >3. Any advice on a low jitter comparator for further digital > processing, > > e.g. for a 1pps signal? > > Thanks and 73 > -- > Manfred VK3AES > ___ > time-nuts mailing list -- time-nuts@lists.febo.com > mailto:time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
