mar. 28 août 2018

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 …

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 …