Five year ago I found an used E4438C very cheap... I bought it in a TEAqusition spasm
Some weeks ago, I realized that the equipment that I own has a 3GHz RF board installed (option 503 is listed, and RF board PN confirmed)
I'm doing some experiments in the 2.4GHz amateur bands using rudimentary DDS generators.
Because of the low noise of the E4438C it would be a dream to extend the frequency range.
Because this equipment is old, obsolete by the manufacturer, no support anymore, I couldn’t find any information on how (if possible) to do it.
I found some information regarding program the CAL file
here in this forum, that doesn't work.
The command
SERV:PRODUCTION:CAL 165,2,3000000000.000000; returns an error. (numeric data not allowed)
I realized that maybe SERV:PRODUCTION:CAL
"165",2,3000000000.000000; is the right way to send the command, but it returns that the file is invalid.
After some research I found that the commands for the ESG-B (E4400B, E4432B, etc) will not work on the ESG-C (E4438C and E4428C) because of relevant differences.
The ESG-C has a LAN connection and allows to read and write files in an FTP directory.
When accessing FTP server, it is possible to move forward leaving the username and password field blank (as the manual says), and then only "USER" folders can be showed.
There are more folders than "USER"... as, maybe accidently, the print screen of page 27 of the "programing guide" shows. (CAL, SYS etc)
I suspect that with a specific username and password the CAL folder can be accessed. Maybe, then it will be possible to understand its file system.
Also, I thought about buying a CPU board from a 3GHz equipment to install its EEPROM (apparently a AT29LV010A-15JC) in my unit. But I'm not sure if this configuration info is written in the EEPROM
I appreciate any help that could help me to achieve this endeavor (here or PM).
Thank you all!