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Juma TRX-2 New Firmware

There is now a new version of the firmware for the Juma TRX-2 transceiver. Whilst this new version does not add any new features, it does significantly enhance and simplify the out-of-band transmit inhibit logic. Whilst the previous method was OK for SSB, with the popularity of modes such as FT8 thi...
by 5B4AIY
24 Aug 2023 13:23
 
Forum: Juma Discussion
Topic: Juma TRX-2 New Firmware
Replies: 0
Views: 11233

Juma TRX-2 Firmware Version 6.0a Build 3

This firmware does not add any new features but significantly simplifies and enhances the out-of-band transmit inhibit logic for SSB. The TX/RX switching logic is entirely performed in the hardware, the microprocessor only senses the status. Consequently, there was no real way of intercepting the PT...
by 5B4AIY
24 Aug 2023 13:15
 
Forum: Juma Firmware by 5B4AIY
Topic: Juma TRX-2 Firmware Version 6.0a Build 3
Replies: 0
Views: 4026

Re: PA-100D Fan always on?

And there I was, hoping that a hard reset would fix things! Apologies for the late reply, I've been rather busy with other things. If you examine the Control Board schematic, you will see that when you press SW7 you apply a +ve voltage to the gate of Q1 via one of the diodes of D1, which causes it t...
by 5B4AIY
13 Dec 2022 08:02
 
Forum: Juma Discussion
Topic: PA-100D Fan always on?
Replies: 12
Views: 28386

Re: PA-100D Fan always on?

You have more than one fault here. With electronic equipment, there is a phenomenon called 'Infact Mortality Failure'. If you were to plot the failure rates of a large number of samples of a device versus time you would see a large number of failures early on, decreasing to a small amount over the m...
by 5B4AIY
06 Dec 2022 07:27
 
Forum: Juma Discussion
Topic: PA-100D Fan always on?
Replies: 12
Views: 28386

Re: PA-100D Fan always on?

In order to connect to the amplifier's RS-232 port you will need to make a cable with a 3.5mm stereo (Tip-Ring-Sleeve) plug on one end and a female DB-9 connector on the other end to connect to the male DB-9 connector of a standard USB to RS-232 adaptor. With the internal jumpers on the Frequency Se...
by 5B4AIY
05 Dec 2022 16:22
 
Forum: Juma Discussion
Topic: PA-100D Fan always on?
Replies: 12
Views: 28386

Re: PA-100D Fan always on?

I can understand your reluctance to open the unit, and, if it is still under warranty, then it would indeed be best to await Rowaves response. Rowaves is actually using my firmware, so if it comes to it and you have to diagnose the fault(s) yourself, then we at least start from a well-known point. F...
by 5B4AIY
05 Dec 2022 10:08
 
Forum: Juma Discussion
Topic: PA-100D Fan always on?
Replies: 12
Views: 28386

Re: PA-100D Fan always on?

Those are an interesting set of symptoms. What firmware are you using? Is it the original or my firmware? In order to proceed, I presume you have the full schematics, if not, please download them as we will need to make some measurements, as well as run some tests.
Adrian, 5B4AIY
by 5B4AIY
05 Dec 2022 07:10
 
Forum: Juma Discussion
Topic: PA-100D Fan always on?
Replies: 12
Views: 28386

Re: Juma PA 100D PTT Connection

Yes, that is correct, the tip of the 3.5mm TIP/RING/SLEEVE plug has to be pulled to ground to put the linear amplifier into transmit. Note that you MUST use a standard stereo plug, that is TIP/RING/SLEEVE, because the sleeve connection repeats the PTT signal, and a mono plug would short this to grou...
by 5B4AIY
01 Nov 2022 13:33
 
Forum: Juma Discussion
Topic: Juma PA 100D PTT Connection
Replies: 1
Views: 11003

Re: JUMA PA1000, Please a hysteresis in the fan routine

I had the same problem with the PA-100D. When I redesigned its firmware I included 2C worth of hysteresis, and this completely fixed this issue. Perhaps in the next update this could be included.
by 5B4AIY
15 Jun 2022 09:05
 
Forum: Juma Discussion
Topic: JUMA PA1000, Please a hysteresis in the fan routine
Replies: 7
Views: 17181

Juma PA-100D Firmware Version: 4.01a

There is now a new version of the firmware for the Juma PA-100D. This is a maintenance build, and whilst it does not add any new features, it closes a very remote 'Window-Of-Opportunity' for an error to cause the serial port to send garbage characters to a connected transceiver in the AUTO frequency...
by 5B4AIY
20 Dec 2021 13:10
 
Forum: Juma Discussion
Topic: Juma PA-100D Firmware Version: 4.01a
Replies: 0
Views: 12025
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