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Re: Juma TRX2A and DSP

Hi, John, Whilst I do not know what may be the future intentions of the designers, I would have to say that, in my opinion, a DSP version of the TRX2A is highly unlikely, for the following reasons: 1. In order to digitally process the signal, there would have to be a connection from the audio stages...
by 5B4AIY
14 Dec 2017 07:03
 
Forum: Juma Discussion
Topic: Juma TRX2A and DSP
Replies: 2
Views: 13

Re: JUMA CMCD Xmitter Main Board components?

Hi, Mike,

I can at least answer your question regarding pin identification. As you say, not all modern ICs have their pins identified. In this case there is a chamfered edge on one side, and if this oriented vertically, then pin 1 is at the top, as shown in the attached image.

73, Adrian, 5B4AIY
by 5B4AIY
07 Nov 2017 12:20
 
Forum: Juma Discussion
Topic: JUMA CMCD Xmitter Main Board components?
Replies: 3
Views: 93

Juma TRX-2 V4.00a

26-November-2017 Build 4 provides a minor enhancement to the Split Mode, as well as a CW Annunciation bug fix. SPLIT MODE ENHANCEMENT In the previous firmware if VFO-B was accidentally left in the TUNE mode when selecting the SPLIT mode, on pressing the PTT switch, only the tuning carrier would be t...
by 5B4AIY
04 Nov 2017 09:45
 
Forum: Juma Firmware by 5B4AIY
Topic: Juma TRX-2 V4.00a
Replies: 0
Views: 130

Juma TRX-2 Firmware Version 4.00a

There is now a new version of my firmware for the Juma TRX-2, version 4.0a, which adds the feature whereby the user can now choose the type of VFO equalisation when operating in the A/B+Split mode. See the section of this website that deals with my firmware modifications.
Adrian, 5B4AIY
by 5B4AIY
04 Nov 2017 09:17
 
Forum: Juma Discussion
Topic: Juma TRX-2 Firmware Version 4.00a
Replies: 0
Views: 56

Re: Where to download dsPICbootloader?

Hi, Dick, You can find the Ingenia bootloader here: http://www.jumaradio.com/juma-trx2/bootloader/ This will link you to a list of files, and the one you want is at the bottom: ingeniadsPICbootloader1.1.zip Simply click on this file, and you will be prompted to save the file. You will also need the ...
by 5B4AIY
21 Oct 2017 06:51
 
Forum: Juma Firmware by 5B4AIY
Topic: Where to download dsPICbootloader?
Replies: 1
Views: 101

Re: TRX2A I/Q phase balance adjustment

Hi, Jef, OK, let's see if we can explain this. The output from the DDS on pin 21, Iout, is a current that is converted to a voltage by the input resistor, R15/200 ohms, of the low pass filter. The complementary output from pin 20, Ioutb, is similarly converted to a voltage by R12/100 Ohms. Both the ...
by 5B4AIY
10 Oct 2017 05:56
 
Forum: Juma Discussion
Topic: TRX2A I/Q phase balance adjustment
Replies: 2
Views: 131

Juma TRX-2 Firmware Version 3.0a Build 31

This version changes the way the Rapid Band-Switch function operates. In the previous versions, in order to eliminate the possibility of a cross-band transmission when operating in the SPLIT mode (VFO-A for receive, VFO-B for transmit), whenever a band change occurred, even in the simplex mode, the ...
by 5B4AIY
23 Aug 2017 05:53
 
Forum: Juma Firmware by 5B4AIY
Topic: Juma TRX-2 Firmware Version 3.0a Build 31
Replies: 0
Views: 257

Juma TRX-2 Version: 3.0a Build 30

There is a new version of my firmware which modifies the way that the Rapid Band-Switch feature operates. It adds a sub-mode that allows the User Memory to be used as a temporary 'scratch-pad'. I was asked if it was possible to save a frequency temporarily. The scenario envisioned tuning, for exampl...
by 5B4AIY
13 Aug 2017 10:37
 
Forum: Juma Discussion
Topic: Juma TRX-2 Version: 3.0a Build 30
Replies: 0
Views: 146

Juma TRX-2 Version: 3.0a Build 30

Version 3.0a Build 30 modifies the way the Rapid Band-Switch feature operates. In this version RBS has 5 modes of operation: DEFAULT In this mode the frequencies are fixed, and are roughly in the centre of the 9 bands from 160m to 10m, and are legal for the IARU Region 1 as well as the USA General/E...
by 5B4AIY
13 Aug 2017 10:28
 
Forum: Juma Firmware by 5B4AIY
Topic: Juma TRX-2 Version: 3.0a Build 30
Replies: 0
Views: 134

Re: Circuit diagram of TRX2A Main Board Rev. C?

Hi, Frank, Attached to this post are the details of the Revision C version of the Main Board. The principle change is the incorporation of the Spur Elimination module rather than having it as a separate attachment as it is in the Revision B version. On the image, you can see this in the top left-han...
by 5B4AIY
06 Aug 2017 07:08
 
Forum: Juma Discussion
Topic: Circuit diagram of TRX2A Main Board Rev. C?
Replies: 3
Views: 228
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