comparison: content/eip545b_6.rst
content/eip545b_6.rst
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| 126:521c35556177 | 128:aba381b2bac9 |
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| 11 | 11 |
| 12 Band 3 Sensitivity | 12 Band 3 Sensitivity |
| 13 ================== | 13 ================== |
| 14 | 14 |
| 15 I have been trying to figure out a bit more about the `sensitivity problem | 15 I have been trying to figure out a bit more about the `sensitivity problem |
| 16 <{static}/eip545b_3.rst#sensitivity-problem>`_ described in `part 3 | 16 <{filename}/eip545b_3.rst#sensitivity-problem>`_ described in `part 3 |
| 17 <{static}eip545b_3.rst>`_. | 17 <{filename}/eip545b_3.rst>`_. |
| 18 | 18 |
| 19 The main problem remains the first YIG sphere that has fall off the holding | 19 The main problem remains the first YIG sphere that has fall off the holding |
| 20 rod. I have tried to manipulate it with thin wood stick, under my cheap USB | 20 rod. I have tried to manipulate it with thin wood stick, under my cheap USB |
| 21 microscope, but as expected, this operation is *very* difficult. | 21 microscope, but as expected, this operation is *very* difficult. |
| 22 | 22 |
| 29 signals from the A203 assembly: the Band 3 RF level signal and the IF threshold | 29 signals from the A203 assembly: the Band 3 RF level signal and the IF threshold |
| 30 signal. | 30 signal. |
| 31 | 31 |
| 32 The overall process of the Band 3 is as follow: | 32 The overall process of the Band 3 is as follow: |
| 33 | 33 |
| 34 .. image:: {static}images/eip545b/band_3_operations.png | 34 .. image:: {static}/images/eip545b/band_3_operations.png |
| 35 :alt: Simplified Band 3 Operations | 35 :alt: Simplified Band 3 Operations |
| 36 | 36 |
| 37 For which the first step is the search for signal: | 37 For which the first step is the search for signal: |
| 38 | 38 |
| 39 .. image:: {static}images/eip545b/band_3_search.png | 39 .. image:: {static}/images/eip545b/band_3_search.png |
| 40 :alt: Band 3 Search for Signal | 40 :alt: Band 3 Search for Signal |
| 41 | 41 |
| 42 I seems to me that the RF level is used for two purposes: in the search for | 42 I seems to me that the RF level is used for two purposes: in the search for |
| 43 signal operation first, to measure the RF level then. | 43 signal operation first, to measure the RF level then. |
| 44 | 44 |
| 60 ====================== | 60 ====================== |
| 61 | 61 |
| 62 In order to understand, I have drawn the schematics of the board on which are | 62 In order to understand, I have drawn the schematics of the board on which are |
| 63 the IF amplifier and the video amplifier: | 63 the IF amplifier and the video amplifier: |
| 64 | 64 |
| 65 .. image:: {static}images/eip545b/A201_2020303.jpg | 65 .. image:: {static}/images/eip545b/A201_2020303.jpg |
| 66 :alt: A201 RF amplifier board | 66 :alt: A201 RF amplifier board |
| 67 | 67 |
| 68 Fortunately, the board is quite simple, and despite being made of SMD | 68 Fortunately, the board is quite simple, and despite being made of SMD |
| 69 components, single sided. | 69 components, single sided. |
| 70 | 70 |
| 71 The schematics looks like: | 71 The schematics looks like: |
| 72 | 72 |
| 73 .. image:: {static}images/eip545b/A201.svg | 73 .. image:: {static}/images/eip545b/A201.svg |
| 74 :alt: Schematic of the A201 RF amplifier board | 74 :alt: Schematic of the A201 RF amplifier board |
| 75 | 75 |
| 76 The video amplifier consist of a simple MC1458 opamp (mainly a dual 741). | 76 The video amplifier consist of a simple MC1458 opamp (mainly a dual 741). |
| 77 | 77 |
| 78 The 15dB gain is selected by an input pin, leveled by the first half of the | 78 The 15dB gain is selected by an input pin, leveled by the first half of the |
| 96 YIG filter filter and mixer assembly | 96 YIG filter filter and mixer assembly |
| 97 ==================================== | 97 ==================================== |
| 98 | 98 |
| 99 The YIG tuned filter and mixer assembly looks like: | 99 The YIG tuned filter and mixer assembly looks like: |
| 100 | 100 |
| 101 .. image:: {static}images/eip545b/YIG-mixer.jpg | 101 .. image:: {static}/images/eip545b/YIG-mixer.jpg |
| 102 :alt: YIG filter output and mixer assembly | 102 :alt: YIG filter output and mixer assembly |
| 103 | 103 |
| 104 Once again, I am trying to understand what this whole thing works, but I really | 104 Once again, I am trying to understand what this whole thing works, but I really |
| 105 don't have the knowledge to do so, really. | 105 don't have the knowledge to do so, really. |
| 106 | 106 |
