JUMA Amateur Radio Forum

Good morning, Hubert, Although I do not have the TX136, the firmware update procedure is essentially the same as that of the Juma TRX-2 and Juma PA-100D. The only difference is the start-up. For the TX 136, from the power OFF state, press and hold the OPER button, and then press the PWR button. You ...

Hi, Frank, Let me see if I can answer your questions regarding the Juma TRX-2. As you are aware, this is a direct conversion SSB/CW transceiver using a Tayloe sampling mixer and a polyphase network for both the transmitter and receiver in order to achieve true single-signal SSB/CW performance. It us...

Version 2.00b Build 3 is essentially a maintenance build, although it does slightly modify the way the alarms are handled. There is also a minor enhancement to the Serial Test suite. I have now added the 'All Alarms On' mode to the Alarms Test module, to bring it into line with the same test in the ...

Hi, Juhani, Glad to be of assistance. Power supplies, OK, let's discuss what is required. There are two characteristics that govern the operation of a regulated power supply - the static regulation, and the dynamic regulation. Static Regulation This parameter determines how well the power supply mai...

Further to my previous post regarding your poor power supply regulation, the following data may be of interest. I set up my Juma TRX-2 and PA-100D connected to a well-matched 50 ohm dummy load. The TRX-2 and PA-100D were powered by the same power supply, a MyDel switch-mode PSU, model MP30SWIV. Both...

This version of the firmware, v2.00a Build 5, alters the way the SWR alarm is processed. I had originally written the firmware so that a high SWR alarm would be asserted in both the STANDBY and the OPERATE states. The intention was that this would provide an additional protection for transceivers th...

Hi, Juhani, From your description, I assume that there are no alarms present. In the alarm logic the over-current, over-voltage, and high SWR alarms will all force the amplifier to the STANDBY state, however the under-voltage alarm will not do this, it will simply display the low voltage alarm. Your...

Hi, Juhani, I'm glad you were able to sort out the problem. There have been several other cases where, although it has been possible to communicate with the transceiver or linear amplifier with a terminal program, that this communication was not possible using the Ingenia loader, and the problem has...

Hi, Juhani, When using the Ingenia loader, the bootloader in the PA-100D uses an automatic speed detection algorithm, so that it is normally not necessary to select a port speed. However, sometimes the USB to RS232 convertor does not operate correctly at the highest speed, 115kb and you may have to ...

There still seems to be a certain amount of confusion associated with the firmware update procedure for both the Juma TRX-2 transceiver and its PA-100D companion linear amplifier, as a recent post on the forum suggests. Attached to this post is a document I wrote describing how this should be done i...