JUMA Amateur Radio Forum

There is now a new version of the firmware for the Juma TRX-2 transceiver. This version adds the feature that allows adjustment of the Low-Voltage Pre-Limit trip value. Previously it was fixed at 100mV higher than the final limit value. NOTE: BECAUSE THIS FIRMWARE USES AN ADDITIONAL WORD OF EEPROM M...

THIS VERSION OF THE FIRMWARE WILL CAUSE A CHECKSUM ERROR ON INITIAL START-UP AFTER LOADING. THIS IS BECAUSE THE EEPROM MAPPING HAS CHANGED. MAKE SURE YOU RECORD YOUR CALIBRATION AND CONFIGURATION DATA PRIOR TO LOADING. There are pages at the back of the User Manual set aside for this. This version ...

There is now a new version of the firmware for the Juma PA-100D linear amplifier, version 4.00a Build 4. This new version adds some additional features. The amplifier can now communicate with a transceiver using the Yaesu 5-Byte Binary command protocol. The Low-Voltage Pre-Limit warning threshold is...

NOTE: AS THIS VERSION USES AN ADDITIONAL WORD OF EEPROM, IT WILL CAUSE A CHECKSUM ERROR ON INITIAL POWER-UP! MAKE SURE YOU NOTE YOUR EXISTING CALIBRATION AND CONFIGURATION DATA PRIOR TO LOADING. This version of the firmware introduces three new features: 1. The Low-Voltage Pre-Limit is now adjustab...

There is now an updated version of the firmware for the Juma PA-100D. Whilst this version does not add any new features, it does fix a very minor and subtle bug as well as optimizing some code. Yes, I know, I'm probably going to be accused of being obsessive/compulsive, but with the COVID-19 lockdow...

This update fixes a very minor and subtle bug, as well as optimizing the fan speed control code. The bug was that in the Calibration & Setup the number of words saved and the CRC was not sent when a serial terminal was connected. As for optimizing the Fan Speed code, as a result of the enforced ...

Hi, Guntram, Glad that your problems are sorted, that was a nice Xmas present for you. Also, just to say that even though the Juma TRX-2 and PA-100D have now been 'retired' I will still be providing technical and software support. You now have the latest version for the PA-100D, I do not envision an...

Hi, Matti, I have to say that I am really sad that the Juma TRX-2 and PA-100D are now being retired. I well understand the commercial aspects of producing these kits, and, to be honest, I had rather hoped that there would be a TRX-3 with improved DDS chip as well as a couple of other hardware improv...

Hi, Christoph, Welcome to the world of Juma Radio! Hardware Upgrades Spur Elimination Module Your main board, revision 'B' will need the Spur Elimination Module if you are to take advantage of the improved receiver performance that accompanies this modification. The later board, revision 'C', incorp...

There is now an updated version of the firmware for the Juma TRX-2 transceiver. This update, Version 5.00a Build 8, improves the serial port mode selection by adding a DISABLED choice to ensure that stray characters are rejected. This version can be safely loaded over a previous version 5, but if yo...