comparison: content/eip545b_3.rst
content/eip545b_3.rst
- changeset 77
- 9ba7fe3d0a22
- parent 76
- aa1c62f79518
- child 82
- 4d8bca9ff106
equal
deleted
inserted
replaced
| 76:aa1c62f79518 | 77:9ba7fe3d0a22 |
|---|---|
| 52 Thanks to the TEST10 allowing to read any address in the address space (be it | 52 Thanks to the TEST10 allowing to read any address in the address space (be it |
| 53 RAM, EEPROM, EPROM or even I/O registers), I wrote a simple Python script to | 53 RAM, EEPROM, EPROM or even I/O registers), I wrote a simple Python script to |
| 54 read the whole content of the RAM via GPIB. | 54 read the whole content of the RAM via GPIB. |
| 55 | 55 |
| 56 It's very slow, since I did not find a way using GPIB commands to read 2 memory | 56 It's very slow, since I did not find a way using GPIB commands to read 2 memory |
| 57 addresses without quitting the TEST10 mode between to reads. And I had to add | 57 addresses without quitting the TEST10 mode between two reads. And I had to add |
| 58 several sleep() since the EIP is pretty slow to respond to GPIB commands. A | 58 several sleep() since the EIP is pretty slow to respond to GPIB commands. A |
| 59 complete dump of the 2ko RAM took somethin like 15 or 20 minutes. | 59 complete dump of the 2ko RAM took somethin like 15 or 20 minutes. |
| 60 | 60 |
| 61 I did not even wrote a script, in fact, just throw some code in an IPython | 61 I did not even wrote a script, in fact, just throw some code in an IPython |
| 62 session. However, the crude code looks like: | 62 session. However, the crude code looks like: |
| 131 | 131 |
| 132 So I just have to replace these code by NOP instructions and it should be fine | 132 So I just have to replace these code by NOP instructions and it should be fine |
| 133 for the Frequency Offset, which I haven't done yet (I was waiting for a cheap | 133 for the Frequency Offset, which I haven't done yet (I was waiting for a cheap |
| 134 EPROM eraser from eb, which just arrived). | 134 EPROM eraser from eb, which just arrived). |
| 135 | 135 |
| 136 Now I also want to fix the initial resolution setup, which I haven't figured | 136 Concerning the resolution, some clue can be found just after the previous |
| 137 out yet. | 137 routine:: |
| 138 | |
| 139 6125 LDX #M005D ;8E 00 5D | |
| 140 6128 LDA #$0D ;86 0D | |
| 141 612A STA $01,X ;A7 01 | |
| 142 612C LDA #$05 ;86 05 | |
| 143 612E STA >M0045 ;B7 00 45 | |
| 144 | |
| 145 In which the value 0x0D is written at RAM address 0x005E (0x005D + 0x01 from | |
| 146 the opcode ``STA $01,X``), and the value 0x05 is written at RAM address 0x0045, | |
| 147 which we identified previously as a candidate for the digits resolution | |
| 148 setting; pretty consistant with the 0x05 value written there. Not sure what the | |
| 149 0x0D is used for at address 0x005E. | |
| 138 | 150 |
| 139 | 151 |
| 140 The sensitivity problem | 152 The sensitivity problem |
| 141 ======================= | 153 ======================= |
| 142 | 154 |
| 161 .. image:: {filename}images/eip545b/yig_top.jpg | 173 .. image:: {filename}images/eip545b/yig_top.jpg |
| 162 :alt: Top view of the YIG filter | 174 :alt: Top view of the YIG filter |
| 163 | 175 |
| 164 On the bottom side, we can see the YIG spheres and the coupling loops: | 176 On the bottom side, we can see the YIG spheres and the coupling loops: |
| 165 | 177 |
| 166 .. image:: {filename}images/eip545b/yig_bottomn.jpg | 178 .. image:: {filename}images/eip545b/yig_bottom.jpg |
| 167 :alt: Top view of the YIG filter | 179 :alt: Top view of the YIG filter |
| 168 | 180 |
| 169 So this filter consists in a 2 stage bandpass filter (with input and output | 181 So this filter consists in a 2 stage bandpass filter (with input and output |
| 170 couplig loops at 90° each other). | 182 couplig loops at 90° each other). |
| 171 | 183 |
| 191 Meanwhile, I've bought on eb a cheap (20$) A203 assembly. It's not exactly the | 203 Meanwhile, I've bought on eb a cheap (20$) A203 assembly. It's not exactly the |
| 192 same model (it's probably one for the 26.5GHz version, according to | 204 same model (it's probably one for the 26.5GHz version, according to |
| 193 HighPrecision), we'll see if it works. I hope it's a 127MHz version, otherwise | 205 HighPrecision), we'll see if it works. I hope it's a 127MHz version, otherwise |
| 194 I'll have to replace the YIG filter (A201) on my A203 unit with this one. | 206 I'll have to replace the YIG filter (A201) on my A203 unit with this one. |
| 195 | 207 |
| 196 By the way, for thoses interested, I found these 2 documents interesting to | 208 By the way, for thoses interested, I found these 2 simple documents interesting |
| 197 begin to understand how a YIG oscillator and a YIG filter works: | 209 to begin to understand how a YIG oscillator and a YIG filter works: |
| 198 | 210 |
| 199 - `YIG TUNED OSCILLATORS`_ | 211 - `YIG TUNED OSCILLATORS`_ |
| 200 - `YIG TUNED FILTERS`_ | 212 - `YIG TUNED FILTERS`_ |
| 201 | 213 |
| 202 .. _`YIG TUNED FILTERS`: http://www.microlambdawireless.com/uploads/files/pdfs/ytfdefinitions2.pdf | 214 .. _`YIG TUNED FILTERS`: http://www.microlambdawireless.com/uploads/files/pdfs/ytfdefinitions2.pdf |
