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Juma Firmware v1.07y

As a result of feedback from a number of interested amateurs, version 1.07y is now available. This is of particular interest to the US community, as this firmware now incorporates the ability to selecte either the Extra or the General Class licence band limits for the out-of-band detection. It also ...
by 5B4AIY
09 Jun 2012 12:37
 
Forum: Juma Discussion
Topic: Juma Firmware v1.07y
Replies: 1
Views: 1785

Re: Reducing power output of TRX2

Hi, Jan, I forgot to mention R26, which adjusts the gain and hence the output power on the SSB modes, my apologies. R28 sets the CW carrier level, of course. By adjusting these two potentiometers you can easiy set the transceiver up for no more than 5W in either CW or SSB modes. The fixed attenuator...
by 5B4AIY
02 Jun 2012 06:30
 
Forum: Juma Discussion
Topic: Reducing power output of TRX2
Replies: 3
Views: 4144

Juma TRX2 Firmware Version 1.07x

Since I cannot leave anything alone for very long, there is now an updated version of the firmware for this transceiver, version 1.07x. This introduces a slightly modified feature, an anomaly fix, (hardly a bug), and some general improvements in the operation. The enhancement allows you to adjust th...
by 5B4AIY
01 Jun 2012 18:26
 
Forum: Juma Discussion
Topic: Juma TRX2 Firmware Version 1.07x
Replies: 1
Views: 1931

Re: Reducing power output of TRX2

Hi, The output power of the transceiver can be adjusted by means of the carrier level control R28 on the main board. It is normally set to give an output of 10W, but this can easily be reduce to 5W by re-adjusting this potentiometer if you wish. The output power can also be set with the on-board att...
by 5B4AIY
01 Jun 2012 18:09
 
Forum: Juma Discussion
Topic: Reducing power output of TRX2
Replies: 3
Views: 4144

Re: PA-100D Bias adjustment is only 300ma

Hi, Robert, Perhaps these notes will help. Let's examine how the bias adjustment for the PA-100D works. If you print out the schematic for this, titled: "JUMA PA100 100W LINEAR AMPLIFIER RF AMPLIFIER BOARD SCHEMATICS", then you can see what's happening. It is important to realise that the ...
by 5B4AIY
27 Apr 2012 14:48
 
Forum: Juma Discussion
Topic: PA-100D Bias adjustment is only 300ma
Replies: 2
Views: 2271

Juma TRX-2 Firmware - Version 1.07w Build 10

There is now a new version of the Juma TRX-2 firmware available, version 1.07w Build 10. This new version fixes some minor bugs, as well as introducing some new features. As before this is 'NOT' an official update, but merely my customisation of this beautiful little gem. If you are updating from on...
by 5B4AIY
07 Apr 2012 06:37
 
Forum: Juma Discussion
Topic: Juma TRX-2 Firmware - Version 1.07w Build 10
Replies: 2
Views: 4432

Juma TRX2 Firmware, Version 1.07u Build 12

First a Happy New Year to everyone. Next, since I can never leave anything alone for long, and as I had some time on my hands over the holiday, I was revising the alarm sub-system code and I noticed that it was possible, under certain circumstances, to disable the High SWR alarm. This was never my i...
by 5B4AIY
07 Jan 2012 14:11
 
Forum: Juma Firmware by 5B4AIY
Topic: Juma TRX2 Firmware, Version 1.07u Build 12
Replies: 4
Views: 5609

Juma TRX2 & PA100D Deadly Embrace

During my testing and verification of my firmware modifications, I managed to crash the operating systems of both the TRX2 and the PA100D, and these notes may be of interest. There has been previous mention of a lockup of the PA100D, but I could not find any mention of how it can be provoked. In my ...
by 5B4AIY
25 Nov 2011 19:34
 
Forum: Juma Discussion
Topic: Juma TRX2 & PA100D Deadly Embrace
Replies: 0
Views: 2109
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