• mar. 27 février 2018

    EIP 545B RF Frequency Counter - Part 5

    Thanks to HighPrecision, I've been able to get a copy of an old version of the EIP documentation "Additional Service Information for 5XX CW Counters". It's unfortunately unavailable online, still, it contains a lot of valuable information.

    The part dedicated to verifying the Band 3 Microwave Converter (A203) is as …

    • jeu. 15 février 2018

      EIP 545B RF Frequency Counter - Part 4

      This part is about my attempt to modify the firmware to "fix" the problem of weird intial setup: a -160MHz offset and a resolution set to 5 digits.

      In the previous part, we figured some probable spots in the firware where these default setup configurations might be set.

      EPROM checksums …

      • ven. 26 janvier 2018

        EIP 545B RF Frequency Counter - Part 3

        Default settings

        One of the annoying thing with this 'SPECIAL' edition of the firmware are the default settings:

        • Frequency Offset -160MHz
        • Resolution 5 digits

        One of my goals while disassembling the formware was to 'fix' these defaults settings. I was wondering wether they where located in an undocumented part of …

        • sam. 20 janvier 2018

          EIP 545B RF Frequency Counter - Part 2

          I've started a discussion on the eevblog forum to gather a bit help for my project. And I did well since a few fellows did help me a lot on some aspects.

          I have now been able to run the power meter at full resolution (even if it's very out …

          • mer. 20 décembre 2017

            EIP 545B RF Frequency Counter

            I recently purchased a broken EIP 545B microwave frequency counter on ebay. It was very inexpensive (around 150€ delivered), but obviously, non working.

            The EIP 545B RF Counter

            The device was described as "does not power up", an is clearly not in very good condition. Quite dirty, battered, with the band 2 BNC connector ruined …

            • ven. 22 septembre 2017

              HP ZR24W PSU Repair

              A friend of mine had a problem with his (a bit old) 24" HP monitor: the device was working properly, but only for a while (few minutes at most).

              Looked like a good candidate for a quick repair, problem being most probably bad caps are so.

              The first step was …

              • mar. 03 janvier 2017

                HP3562A Dynamic Signal Analyzer

                One of my old test gears waiting for my attention in the cellar was a HP 3562A Dynamic Signal Analyzer. Back then I bought this device mainly for doing audio analysis (I was building my HiFi system, mostly based on Nelson Pass' schematics), mainly to display spectrum responses and compute …