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New Firmware For Juma PA-100D

There is now a new version of the firmware for the PA-100D. This revision, Version 1.05k Build 2, which is available on the section of the website containing my firmware, improves the operation with the Elecraft KX3 Ultra-Portable HF transceiver. For full details, please see the entry in my firmware...
by 5B4AIY
14 Jul 2013 15:32
 
Forum: Juma Discussion
Topic: New Firmware For Juma PA-100D
Replies: 0
Views: 3768

Re: PA100D PTT Pblm

Good morning, Sid, Glad to be of assistance. Pity about TR1, but it is an easy fix, there is plenty of room around it on the board, and it is easy to remove without damaging the printed circuit board. I generally use two soldering irons, one touching the two leads on one side of the device, the othe...
by 5B4AIY
03 Jul 2013 06:06
 
Forum: Juma Discussion
Topic: PA100D PTT Pblm
Replies: 6
Views: 10030

Re: PA100D PTT Pblm

Hi, Sid, Yes, you definitely have a fault with the Tx/Rx switching logic. The fact that you measure essentially zero ohms on the ring terminal at all times means that either TR2 is shorted, or, more likely, that it is permanently turned on. This in itself would not affect the Tx/Rx switching, TR2 is...
by 5B4AIY
02 Jul 2013 05:25
 
Forum: Juma Discussion
Topic: PA100D PTT Pblm
Replies: 6
Views: 10030

Re: PA100D PTT Pblm

OK, let's see if we can explain what's going on here. It will be essential to download the schematic for the MAIN BOARD, T/R, ATTENUATOR, CURRENT SENSE. The logic associated with the transmit/receive switching is on the lft-hand side, and is the T/R socket with !KEY-OUT and !KEY-IN (NOT-KEY-OUT, NOT...
by 5B4AIY
01 Jul 2013 07:17
 
Forum: Juma Discussion
Topic: PA100D PTT Pblm
Replies: 6
Views: 10030

Re: Juma TRX-1 Version 7.1a

Good Morning, In order to diagnose the problem, I need some further information. Can you please perform the following test? Turn the transceiver on with my firmware loaded. After it has booted up, briefly press the VFO button and select Mode 1, the VFO A/B selection mode. When you rotate the knob cl...
by 5B4AIY
12 Jun 2013 07:08
 
Forum: Juma Firmware by 5B4AIY
Topic: Juma TRX-1 Version 7.1a
Replies: 6
Views: 9738

Re: PA 100d replacement display

That's a blow! However, the display used is fairly standard, and there are a number of replacements readily available. One that you might like to consider is the Lumex LCM-S01602DSF/A, which is stocked by Digi-Key, and their part number is: 67-1758-ND. It is listed at about $14 so it's not a expensi...
by 5B4AIY
06 Jun 2013 07:32
 
Forum: Juma Discussion
Topic: PA 100d replacement display
Replies: 2
Views: 5015

New Firmware for Juma TRX-2

There is now a new version of the firmware for the Juma TRX-2 transceiver, v1.10b Build 1 which ratioalises and changes the power off sequences. Please see the website section dealing with my firmware changes for full details.
Adrian, 5B4AIY
by 5B4AIY
04 Jun 2013 08:39
 
Forum: Juma Discussion
Topic: New Firmware for Juma TRX-2
Replies: 0
Views: 3441

Juma TRX-1 Version 7.1a

This version has essentially the same feature set as the previous version, 7.0c, except that there is now an additional item in the System Setup menu. The additional item - Auto On/Off - governs how the voltage alarm reset behaves. If you select On, then it will display the Mode 2 screen with the vo...
by 5B4AIY
15 May 2013 06:19
 
Forum: Juma Firmware by 5B4AIY
Topic: Juma TRX-1 Version 7.1a
Replies: 6
Views: 9738

New Firmware For TRX-1

There is now new firmware for the Juma TRX-1 DSB/CW QRP Transceiver that incorporates a number of new features and facilities. For full details, please see the section of this website related to my firmware. NOTE: This is NOT an official new release! It is simply my customisation of this little jewe...
by 5B4AIY
11 May 2013 07:01
 
Forum: Juma Discussion
Topic: New Firmware For TRX-1
Replies: 5
Views: 7131

Re: How about PSK on a TRX2A?

Hi, John, The simple answer to your question is - Yes, PSK31/RTTY is perfectly feasible on the Juma TRX-2! The transceiver is well-suited to QRP digital operation, and indeed I have used it quite extensively, mainly on 20m, using the NUE-PSK self-contained modem. Bear in mind that this is NOT a soft...
by 5B4AIY
28 Apr 2013 12:03
 
Forum: Juma Discussion
Topic: How about PSK on a TRX2A?
Replies: 4
Views: 7516
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