Tue, 28 Aug 2018 15:12:24 +0200
[prologix] minor improvments
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1 | =============================== |
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2 | EIP 545B RF Frequency Counter |
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3 | =============================== |
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4 | |
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5 | :author: David Douard |
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6 | :Category: Electronics |
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7 | :Tags: test equipment, RF, EIP, 545B, counter |
74 | 8 | :series: EIP545B Frequency Counter |
9 | :series_index: 1 | |
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10 | |
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11 | |
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12 | I recently purchased a broken EIP 545B microwave frequency counter on ebay. It |
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13 | was very inexpensive (around 150€ delivered), but obviously, non working. |
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14 | |
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15 | .. image:: {filename}images/eip545b/closed_unit.jpg |
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16 | :alt: The EIP 545B RF Counter |
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17 | |
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18 | The device was described as "does not power up", an is clearly not in very good |
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19 | condition. Quite dirty, battered, with the band 2 BNC connector ruined. |
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20 | |
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21 | But inside, it was **very** dusty and a bit rusty: |
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22 | |
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23 | .. image:: {filename}images/eip545b/inside.jpg |
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24 | :alt: Once opened, it's very dusty |
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25 | |
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26 | The YIG filter looking not so good: |
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27 | |
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28 | .. image:: {filename}images/eip545b/rusty_yig.jpg |
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29 | :alt: The rusty YIG filter |
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30 | |
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31 | |
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32 | I quickly checked, and indeed, nothing happened when I tried to power it up. In |
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33 | fact, the fuse was blown. So, instead of just give a try with a new fuse, I |
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34 | decided to disassemble it completely to clean it up, check the power supply |
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35 | independtly, then inserting the boards one at a time. |
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36 | |
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37 | |
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38 | PSU |
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39 | === |
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40 | |
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41 | So the first step has been to check wether the PSU is working fine. Overall, it |
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42 | looks OK: |
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43 | |
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44 | .. image:: {filename}images/eip545b/psu.jpg |
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45 | :alt: The A101 PSU board |
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46 | |
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47 | There are many tantalum capacitors in this unit, including on the PSU board: |
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48 | |
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49 | .. image:: {filename}images/eip545b/psu_tantalums.jpg |
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50 | :alt: Tantalum capacitors on the PSU board |
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51 | |
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52 | But they seem OK, so I gave it a try with no load, but using a variac to rise |
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53 | the input voltage slowly: |
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54 | |
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55 | .. image:: {filename}images/eip545b/psu_test.jpg |
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56 | :alt: Testing the PSU board |
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57 | |
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58 | I plan to build myself a nice isolation transformer unit using this variac, a |
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59 | true isolation transformer I have and the power meter shown on this picture, |
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60 | but that's another story. |
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61 | |
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62 | The results are ok so far, voltages are OK. The PSU seems to work just fine. |
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63 | |
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64 | Cleaning the unit |
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65 | ================= |
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66 | |
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67 | The next step has been to completely disasseble the counter in order to clean |
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68 | it properly. |
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69 | |
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70 | It's a quite simple unit, easy to disassemble, so it took me only a few hours |
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71 | to do so. |
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72 | |
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73 | My only complain is to be obliged to disolder a few wires to disassemble the |
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74 | components from the back panel. |
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75 | |
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76 | I'e washed every part I could in my kitchen sink, with dishwashing soap and a |
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77 | duster, includind the A100 interconnect board. |
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78 | |
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79 | Other PCB board have been cleaned with a small tooth brush, some cloth, and |
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80 | isopropyl alcohol. |
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81 | |
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82 | I also tried to remove a bit of the rust from the YIG filter using some |
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83 | scotch-brite, but I could not really clean it without disassembling it, and I'm |
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84 | not sure wether it is safe to open the enclosure of the YIG filter or not (if |
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85 | it's sealed with special gas for example). Also, I wanted to check if it works |
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86 | before doing anythno stupid. |
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87 | |
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88 | Reassembling and testing |
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89 | ======================== |
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90 | |
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91 | Then I started to reassemble the unit, just putting back togother the front |
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92 | panel, the CPU and the PSU. |
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93 | |
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94 | Once powered, nothing happened, the display did not lit... It happened I forgot |
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95 | to put back the 7805 regulator dedicated to the front panel (and mounted on the |
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96 | aluminium chassis for heat dissipation). Doh! |
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97 | |
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98 | Once fixed, the unit did power up, and reacted to some keys: |
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99 | |
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100 | .. image:: {filename}images/eip545b/test_cpu.jpg |
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101 | :alt: Testing the unit with only the CPU board |
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102 | |
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103 | So far so good. Now the time for testing the other boards. |
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104 | |
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105 | After inserting all the boards but the optional A102 GPIB board, the unit still |
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106 | powered up, but the keyboard was mostly unresponsive, and the "remote" led was |
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107 | lit. Putting back the GPIB board did the trick. |
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108 | |
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109 | I also had to plug the 10MHz In/Out switch back (located on the back panel), |
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110 | since the default (open) position is for "External Reference". |
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111 | |
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112 | Now I can interact with the device. In band 3, and I can hear a small noise, |
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113 | typical for a YIG coil sweeping the range... Good sign! |
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114 | |
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115 | Let's put some signal, first a 6MHz on the band 1 input: |
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116 | |
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117 | .. image:: {filename}images/eip545b/working_band1.jpg |
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118 | :alt: Testing a 6MHz signal on band 1 input |
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119 | |
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120 | It works! I quickly checked band 2 (using a piece of wire since the connector |
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121 | is broken), and it seems to work fine. And band 3: |
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122 | |
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123 | .. image:: {filename}images/eip545b/working_band3.jpg |
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124 | :alt: Testing a 1GHz signal on band 3 input |
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125 | |
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126 | |
82 | 127 | I've checked up 2GHz, the max frequency I can generate using my Anristu MG3670B |
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128 | signal generator. |
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129 | |
82 | 130 | A quick test showed that the sensitivity is not as expected: could not measure |
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131 | any signal below -12 ou -13dBm. |
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132 | |
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133 | |
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134 | Next steps |
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135 | ========== |
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136 | |
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137 | Next steps for this unit are now: |
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138 | |
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139 | 1. Finishing the repair, changing the broken BNC connector, the broken fan |
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140 | (which was in fact the culprit for the blown fuse), as well as, maybe, |
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141 | removing the rust from the YIG filter. |
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142 | |
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143 | 2. Make some performance tests and calibrations (as far as I can do using my |
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144 | equipment). |
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145 | |
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146 | 3. I also want to try to install the Option 2 (Power Meter). This procedure is |
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147 | pretty simple (as long as I manage to program a few 2716 EPROMs with my |
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148 | `MiniPro TL866`_ universal programmer) and has been done by several_ |
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149 | people_, but always on the 545A model, not the B model. Not sure if I can |
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150 | use the EPROM images kindly provided by GBPPR_... |
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151 | |
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152 | |
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153 | |
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154 | .. _people: http://www.qsl.net/n/n9zia//vision/EIP_545A_Modification_Instructions.pdf |
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155 | .. _several: http://www.simonsdialogs.com/2014/09/eip-545a-microwave-counter-power-meter-upgrade/ |
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156 | .. _GBPPR: http://www.qsl.net/n/n9zia/vision/ |
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157 | .. _`MiniPro TL866`: http://autoelectric.cn/EN/TL866_main.html |