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| EIP 545B Frenquency counter |
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| HighPrecision:
This board is the old type @1MHz clock and ancient EPROMs TMS2516/2532, empty sockets are for option firmware extensions, your Opt.02 Power-meter EPROM is located on A107 board. New board is much different, see this link: https://911components.myshopify.com/products/eip-micorwave-2020215-02-a-circuit-card-assembly See my previous posts for more detailed explanations. |
| Dave Cawley:
That's odd ? I also have the band 4 option but not the external sensor, but I don't need it. Do you think my counter may not be as original as I thought it was ? Whatever, it is doing what I want so I'm a happy bunny ! Regards Dave |
| HighPrecision:
--- Quote from: Dave Cawley on December 30, 2018, 10:19:35 am ---That's odd ? --- End quote --- Not necessarily :) Your hardware configuration depend by CCN number on a label at rear panel, unless this unit was modified previously by others (board exchange), the presence of MC68(B)21P probably indicate a possible previous attempt to resolve the keyboard problem. I have a 578B with some options (01,02,05,06) and this unit have some old boards, clearly exchanged with other units, but after repair it's fully operative with very good sensitivity on band 3. |
| Dave Cawley:
:palm: Just went into the workshop it is a 548A, options 02, 06 serial number 02063 ccn 2309 or maybe 2307 ? Sensitivity on 2.7Ghz -32dBm |
| HighPrecision:
--- Quote from: Dave Cawley on December 30, 2018, 05:29:09 pm --- :palm: Just went into the workshop it is a 548A, options 02, 06 serial number 02063 ccn 2309 or maybe 2307 ? Sensitivity on 2.7Ghz -32dBm --- End quote --- A105 board in your photo is consistent with the CCN 2307 band 3 sensitivity at -32dBm is good as the majority of these units, some A203 MW converters exhibit more sens as mine at -37dBm. |
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