comparison: content/10MHz_ref.rst
content/10MHz_ref.rst
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| 20 The Rubidium Frequency Reference | 20 The Rubidium Frequency Reference |
| 21 ================================ | 21 ================================ |
| 22 | 22 |
| 23 The device is a small enclosure with only a 2x5 pins connector: | 23 The device is a small enclosure with only a 2x5 pins connector: |
| 24 | 24 |
| 25 .. image:: {static}images/freq_ref/efratom.jpg | 25 .. image:: {static}/images/freq_ref/efratom.jpg |
| 26 :alt: The Efratom LPRO-101 frequency standard. | 26 :alt: The Efratom LPRO-101 frequency standard. |
| 27 | 27 |
| 28 The exact model is an Efratom Rubidium Frequency Standard Model LPRO-101: | 28 The exact model is an Efratom Rubidium Frequency Standard Model LPRO-101: |
| 29 | 29 |
| 30 .. image:: {static}images/freq_ref/efratom_sticker.jpg | 30 .. image:: {static}/images/freq_ref/efratom_sticker.jpg |
| 31 :alt: The Efratom LPRO-101 frequency standard. | 31 :alt: The Efratom LPRO-101 frequency standard. |
| 32 | 32 |
| 33 Inside the enclosure, there is a single PCB with SMD and through hole | 33 Inside the enclosure, there is a single PCB with SMD and through hole |
| 34 components. It's quite dense. | 34 components. It's quite dense. |
| 35 | 35 |
| 36 .. image:: {static}images/freq_ref/efratom_inside.jpg | 36 .. image:: {static}/images/freq_ref/efratom_inside.jpg |
| 37 :alt: The PCB of the Efratom LPRO-101 frequency standard. | 37 :alt: The PCB of the Efratom LPRO-101 frequency standard. |
| 38 | 38 |
| 39 The rubidium lamp with the resonant cavity occupy almost a quarter of the | 39 The rubidium lamp with the resonant cavity occupy almost a quarter of the |
| 40 total area. The cover of the enclosure is compartimented, mainly to | 40 total area. The cover of the enclosure is compartimented, mainly to |
| 41 shield the lamp+cavity device from the remaining of the board: | 41 shield the lamp+cavity device from the remaining of the board: |
| 42 | 42 |
| 43 .. image:: {static}images/freq_ref/efratom_enclosure.jpg | 43 .. image:: {static}/images/freq_ref/efratom_enclosure.jpg |
| 44 :alt: The enclosure of the Efratom LPRO-101 frequency standard. | 44 :alt: The enclosure of the Efratom LPRO-101 frequency standard. |
| 45 | 45 |
| 46 | 46 |
| 47 The Rubidium Freq Ref seems to workjust fine. I've powered it a few | 47 The Rubidium Freq Ref seems to workjust fine. I've powered it a few |
| 48 times, and it take a few minutes to lock the lamp and stabilize the | 48 times, and it take a few minutes to lock the lamp and stabilize the |
| 58 The Extron Video Amplifier | 58 The Extron Video Amplifier |
| 59 ========================== | 59 ========================== |
| 60 | 60 |
| 61 The video amplifer on the other hand has a bit of a trouble: | 61 The video amplifer on the other hand has a bit of a trouble: |
| 62 | 62 |
| 63 .. image:: {static}images/freq_ref/extron.jpg | 63 .. image:: {static}/images/freq_ref/extron.jpg |
| 64 :alt: the Extron Electronics video amplifier | 64 :alt: the Extron Electronics video amplifier |
| 65 | 65 |
| 66 As you can see on the picture above, the inductor is broken, and there | 66 As you can see on the picture above, the inductor is broken, and there |
| 67 is no visible mark on it. This inductor is used to produce the | 67 is no visible mark on it. This inductor is used to produce the |
| 68 symetric voltages required to poser the opamp used to dispatch the | 68 symetric voltages required to poser the opamp used to dispatch the |
| 69 signal. | 69 signal. |
| 70 | 70 |
| 77 Fro the schematic I could extract, it appeared that the design is in | 77 Fro the schematic I could extract, it appeared that the design is in |
| 78 fact very close to the reference schematic proposed by LT in the | 78 fact very close to the reference schematic proposed by LT in the |
| 79 datasheet_, in the Bipolar Output DC/DC Converter configuration page | 79 datasheet_, in the Bipolar Output DC/DC Converter configuration page |
| 80 16: | 80 16: |
| 81 | 81 |
| 82 .. image:: {static}images/freq_ref/lt1616_bipolar_output_DC2DC.svg | 82 .. image:: {static}/images/freq_ref/lt1616_bipolar_output_DC2DC.svg |
| 83 :alt: LT1616 Bipolar Output DC/DC converter. | 83 :alt: LT1616 Bipolar Output DC/DC converter. |
| 84 :align: center | 84 :align: center |
| 85 | 85 |
| 86 It produces +/-5V from the 12V input. But still, I did not know what | 86 It produces +/-5V from the 12V input. But still, I did not know what |
| 87 kind of inductor/xformer I should use. I did not notice at first sight | 87 kind of inductor/xformer I should use. I did not notice at first sight |
| 92 find the reference of the inductor. By the way, it's a Sumida CLS62 | 92 find the reference of the inductor. By the way, it's a Sumida CLS62 |
| 93 Series inductor (as indicated in the datasheet). And according to the | 93 Series inductor (as indicated in the datasheet). And according to the |
| 94 reference design, it should be a 22µH one. So let's make a purchase | 94 reference design, it should be a 22µH one. So let's make a purchase |
| 95 for this inductor as well as some 20k resistors for my HP8904A_. | 95 for this inductor as well as some 20k resistors for my HP8904A_. |
| 96 | 96 |
| 97 .. _HP8904A: {static}hp8904a.rst | 97 .. _HP8904A: {filename}/hp8904a.rst |
| 98 | 98 |
| 99 | 99 |
| 100 | 100 |
| 101 | 101 |
| 102 .. _LT1616: http://www.linear.com/product/LT1616 | 102 .. _LT1616: http://www.linear.com/product/LT1616 |
