EIP 545B RF Frequency Counter - Firmware
This part will focus on the analyze of the firmware I made so far, in order to fix a few issues I have encountered in my unit, as related in previous previous part.
It will be updated as I make progress on disassembling and understanding the firmware.
Original Firmware
The …
EIP 545B RF Frequency Counter - Part 6
Band 3 Sensitivity
I have been trying to figure out a bit more about the sensitivity problem described in part 3.
The main problem remains the first YIG sphere that has fall off the holding rod. I have tried to manipulate it with thin wood stick, under my cheap USB …
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 …
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 …
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 …
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 …
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 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 …
Quick overview of the HP5334A Universal Counter
The HP5334A is a decent universal counter. It has a two 100MHz channels. Some models come with an optional third channel (1.3GHz), an optinal DVM, and an optional oven controlled oscillator. Unfortunately, my meter has no option at all.
There is a nice quick instruction set printed on the …