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Juma TRX-2 V.4.00a Build 6

Build 6 - 11/JAN/2018 This build optimises the Vibroplex contact bounce suppression logic by eliminating a redundant test, and ensuring that the contact bounce suppression timer is only set once on the initial contact closure detection. This version makes no EEPROM changes, and so can be safely load...
by 5B4AIY
28 Dec 2017 09:10
 
Forum: Juma Firmware by 5B4AIY
Topic: Juma TRX-2 V.4.00a Build 6
Replies: 0
Views: 76

Re: Juma TRX2A and DSP

Hi, John, Taking another look, if you were to use a plug-in daughter board using the voice memory option connector, you have access to the audio in/out, microphone in/out as well as the SPI bus, and thus there is a possibility of incorporating an advanced DSP module without any surgery, or, at most ...
by 5B4AIY
16 Dec 2017 07:44
 
Forum: Juma Discussion
Topic: Juma TRX2A and DSP
Replies: 5
Views: 130

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: 5
Views: 130

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: 119

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: 173

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: 78

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: 135

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: 162

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: 272

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: 164
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