SEI branded 10 Mhz quartz oscillator, need help with tech specs - Page 1
Forum section: electronics / rf-microwave

author: cio74
author_rank: Regular Contributor
timestamp: June 27, 2016, 01:22:56 pm
content: Hello,I have got this quartz oscillator, does anyone has any idea about technical specs and pinout?Thanks.cio

author: valgamaa
author_rank: Contributor
timestamp: June 27, 2016, 04:37:29 pm
content: SEI are now known as Rakon, so you could check their website for information.

author: StillTrying
author_rank: Super Contributor
timestamp: June 27, 2016, 04:59:44 pm
content: I make it Salford Electrical Instruments - no longer though.http://www.lintechcomponents.com/product/manufacturer/K0142/showhttp://www.gracesguide.co.uk/Salford_Electrical_Instrumentshttp://www.sdamagnetics.co.uk

author: Vgkid
author_rank: Super Contributor
timestamp: June 27, 2016, 07:04:21 pm
content: Quote from: valgamaa on June 27, 2016, 04:37:29 pmif it is part of Rakon, good luck on getting specs. I had some ocxo's with date codes of 00-02, and specs are only what you can find online.

author: cio74
author_rank: Regular Contributor
timestamp: July 01, 2016, 02:29:15 pm
content: I couldn't find anything about it.However, I am keen to see it working, I am thinking to start with say 3.3v voltage, can someone give a hint about the most common pinot layout or there is no such thing.I pin is tied to the case but the other 3 are not, one is Vcc, one is Output, one may be not connected?

author: cio74
author_rank: Regular Contributor
timestamp: July 01, 2016, 05:33:16 pm
content: This is what I get after a little play, 5v VdcIt does not look like a nice sine wave, any ideas?Below is the 10Mhz from Anritsu generator terminated in 50ohm, 0dBm

author: timb
author_rank: Super Contributor
timestamp: July 02, 2016, 01:02:29 am
content: Quote from: cio74 on July 01, 2016, 05:33:16 pmThat's not abnormal looking. A lot of these oscillators put out what I like to call a "rounded square wave". In fact, that looks pretty good! No ringing, good amplitude. You shouldn't have any problems using that as a clock source.

author: uncle_bob
author_rank: Unknown
timestamp: July 02, 2016, 02:12:21 am
content: HiHere's the most basic question:You can build a 10 MHz XO from scratch for under $5 and you will know what it does. It may well perform better in your application than the unit you have. Since there are no specs on the unit, and not even a fully filled out label .... tough to know what you have or if it was scrapped rather than sold.So: What *are* you trying to do with the oscillator you have?Bob

author: edavid
author_rank: Super Contributor
timestamp: July 02, 2016, 02:33:40 am
content: It might be a 12V oscillator. I would try increasing the supply voltage a little, and seeing if the waveform improves. If so, you can (cautiously) take it up to 12V.

author: cio74
author_rank: Regular Contributor
timestamp: July 02, 2016, 08:40:51 am
content: It came with a lot of used circuits I bought on Ebay, I don't have any plans to do with it at the moment, just sorting bits and trying to figure out what I *may* do at some point

author: Gertjan
author_rank: Frequent Contributor
timestamp: July 02, 2016, 09:38:13 am
content: Hi Cio74,You could try to mail Rakon.I asked them about Rakon TCXO's I have without info, and I found them very helpful.My contact was Hugh Tucker, email: Hugh.Tucker@rakon.comThat fourth pin is probably the VCO input, to fine-tune the frequency....regards & good luck, Gertjan.

author: cio74
author_rank: Regular Contributor
timestamp: July 02, 2016, 03:21:24 pm
content: Thank you, I will certainly email them and see if I get any reply.

author: Brian of Romsey
author_rank: Contributor
timestamp: April 15, 2018, 08:32:51 pm
content: Hi cio,Did you work out what the functions of the four pins are and what the optimal operating voltage is? I ask because I have recently acquired a similar unit:QC1206Frequency 94.808 MHzSerial No. 721559Thanks, Brian.

author: Brian of Romsey
author_rank: Contributor
timestamp: July 12, 2018, 09:25:56 pm
content: Hi,I finally got round to testing and sorting this oscillator. It does work (which is always a worry for second hand stuff from a radio rally).At 9.0 Volts it draws between 3 mA and 8 mA on the pin diagonally opposite the ground pin. The output is a sinewave, centred on ground, with an amplitude of 2.9 Volts peak-to-peak when loaded only with the 'scope and 1.8 Volts peak-to-peak when loaded with 50 Ohms.The pin-out, viewed from above (like normal chips are):+------------------------+| 4 = Ground ... Out = 3 || 1 = N/C .. 9 Volts = 2 |+------------------------+Strangely my bench PSU seemed unable to deliver a solid supply, loads of ripple - 840 mVolts! Even with a 47 nF polyester & a 470 pF polystyrene right across the pins the ripple only got down to 530 mVolts. Ah well, the output looked like a clean sinewave no matter what.Cheers, Brian.

author: Brian of Romsey
author_rank: Contributor
timestamp: July 14, 2018, 03:24:00 pm
content: Hi,I finally got round to testing and sorting this oscillator. It does work (which is always a worry for second hand stuff from a radio rally).At 9.0 Volts it draws between 3 mA and 8 mA on the pin diagonally opposite the ground pin. The output is a sinewave, centred on ground, with an amplitude of 2.9 Volts peak-to-peak when loaded only with the 'scope and 1.8 Volts peak-to-peak when loaded with 50 Ohms.The pin-out, viewed from above (like normal chips are):+------------------------+| 4 = Ground ... Out = 3 || 1 = N/C .. 9 Volts = 2 |+------------------------+Strangely my bench PSU seemed unable to deliver a solid supply, loads of ripple - 840 mVolts! Even with a 47 nF polyester & a 470 pF polystyrene right across the pins the ripple only got down to 530 mVolts. Ah well, the output looked like a clean sinewave no matter what.Cheers, Brian.

author: boelem_b
author_rank: Newbie
timestamp: December 20, 2024, 02:19:13 pm
content: Hi, I removed an SEI VCOCXO (Voltage controlled Oven Controlled Crystal Oscillator) from a Marconi TF2171 Synchronizer (goes with a TF2015 signal generator) to use in a GPS disciplined Oscillator.This has the following spec. (as used in the Marconi unit)Model nr. 1311AOutput frequency: 5MHz+5v supply for the oscillator part+12V supply for the heater part (max. around 0.5A at 12V, but goes down as the unit heats up.)0-12v for Vctl (control voltage)Unloaded output at 5MHz is 0.4v-3.1vViewed from above (not the pin side):+------------------------------------------------------------------+| pin4 = 5MHz Output Vctl =pin5 +12v= pin3 || || || || || pin1 = GND +5v Volts = pin2 |+------------------------------------------------------------------+Note I used the pin numbers as in the TF2171 schematic.