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Re: JUMA 100D Firmware Update

Hi, Greg, This is a puzzle! Before you try and replace the MAX232 chip, it's wise to see if it is working. The old RS-232 standard inverted the data, so on the PA-100D TX Data side a +5V TTL signal is a logic '1' and this should indeed result in a -9V output signal on the TX DATA line, similarly a -...
by 5B4AIY
28 Nov 2018 13:10
 
Forum: Juma Firmware by 5B4AIY
Topic: JUMA 100D Firmware Update
Replies: 14
Views: 1047

Juma TRX-2 v5.00a Build 6

Juma TRX-2 firmware version 5.00a Build 6 optimises the operation of the transceiver when equipped with the new active roofing filter. This filter was introduced a few years ago, and improves the performance compared to the original by having narrower bandwidths, steeper skirts, and greater stop ban...
by 5B4AIY
28 Nov 2018 12:37
 
Forum: Juma Firmware by 5B4AIY
Topic: Juma TRX-2 v5.00a Build 6
Replies: 0
Views: 506

Re: JUMA 100D Firmware Update

Hi, Greg I'm sorry to hear that you are having a problem, let's see if we can determine the cause. To answer your questions, -6.3V for the TX Data line from your USB-RS232 converter is perfectly OK. I have measured the voltage from several of these converters, and both the FTDI and Prolific chipsets...
by 5B4AIY
25 Nov 2018 07:16
 
Forum: Juma Firmware by 5B4AIY
Topic: JUMA 100D Firmware Update
Replies: 14
Views: 1047

Juma PA-100D v3.0c Build 6

This version is a maintenance build. It does not introduce any new features, but simply cleans up some code, and fixes some minor inconsistencies. For full details, read the comments in the file juma-pa100.c at line 481 onwards which covers version 3.00c. This version can be safely loaded over the p...
by 5B4AIY
08 May 2018 06:22
 
Forum: Juma Firmware by 5B4AIY
Topic: Juma PA-100D v3.0c Build 6
Replies: 0
Views: 1372

Re: PA100-D

Hi, Ed, No, as far as I am aware, the only technical description is that found on the web page related to this kit. Please be aware that the User Manual I have written is specifically intended for my modified firmware, which is significantly different from the original. My latest firmware is version...
by 5B4AIY
08 May 2018 05:58
 
Forum: Juma Discussion
Topic: PA100-D
Replies: 2
Views: 1062

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: 1478

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: 1461

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: 1461

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: 988

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: 1002
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