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Juma PA-100D Version 4.01a

This is a maintenance build, and does not add any new features. An examination of the code showed that there was a very remote 'window-of-opportunity' for an error to cause garbage to be sent on the serial port to a connected transceiver in the AUTO frequency sense mode. I hasten to add that in now ...
by 5B4AIY
20 Dec 2021 12:59
 
Forum: Juma Firmware by 5B4AIY
Topic: Juma PA-100D Version 4.01a
Replies: 0
Views: 10402

Re: Juma PA-100D and KX3 CAT problem

Hi, If you are using my firmware for the PA-100D it is possible to retrieve band information as well as have the KX3 work with Omnirig. You will need to make yourself a cable from the KX3 serial data output so that the TX Data from the KX3 is fed to the RX Data input of the PA-100D as well as to you...
by 5B4AIY
10 Dec 2021 11:04
 
Forum: Juma Discussion
Topic: Juma PA-100D and KX3 CAT problem
Replies: 2
Views: 11538

Re: JUMA TRX-2 Version 5.0a Build 8

Hi, Andrei, With only this information, I am somewhat mystified as to what is happening. I should add that Version 5, build 8 is now quite old, and I would always recommend updating to the latest version. There are only 6 error messages that might be displayed: Oscillator Trap - This can occur if th...
by 5B4AIY
09 Oct 2021 06:25
 
Forum: Juma Firmware by 5B4AIY
Topic: JUMA TRX-2 Version 5.0a Build 8
Replies: 2
Views: 13427

Re: Juma PA-100D Firmware Update

Hi Andrei, I am not quite sure what you would like, so let me see if I understand you. It would seem that you would like the PA-100D to be capable of being controlled from the Elad FDM-DUO both for transmit/receive switching, as well as automatic band selection. That being the case there are two pos...
by 5B4AIY
01 Sep 2021 13:55
 
Forum: Juma Discussion
Topic: Juma PA-100D Firmware Update
Replies: 4
Views: 17868

Re: PA-100D output

Hi, Marcel, Since the input attenuator uses discrete components it would certainly be possible to increase the attenuation. For example, if the attenuation steps were increased so that the 2dB attenuator was 3dB, and the 4dB attenuator was 5dB, then this would give steps of 0, 3, 5, and 8dB. With 8d...
by 5B4AIY
28 Mar 2021 07:09
 
Forum: Juma Discussion
Topic: PA-100D output
Replies: 3
Views: 12861

Re: PA-100D output

Hi, Marcel, The PA-100D is fitted with a stepped input attenuator, having 4 settings. The nominal maximum power gain of the amplifier is between 14dB and 15dB. By setting the gain to its lowest setting, G1, with an input power of 5W (37dBm) you will have a power gain of about 9dB to 10dB giving an o...
by 5B4AIY
24 Mar 2021 11:42
 
Forum: Juma Discussion
Topic: PA-100D output
Replies: 3
Views: 12861

Re: Faulty Juma TRX2

Hi, Elia, Yes, that was the most likely candidate. The problem arises because of the use of tantalum electrolytic capacitors when connected directly to a low-impedance current source such as a power supply. These capacitors have very low effective series resistance, and hence when subject to a switc...
by 5B4AIY
18 Jul 2020 11:21
 
Forum: Juma Discussion
Topic: Faulty Juma TRX2
Replies: 4
Views: 11375

Re: Faulty Juma TRX2

Hi, Elia, Let's talk about how the power switch of the TRX-2 works. In the OFF state there is +12V applied to pin 2 of Q2. Q2 is off at this point. When the PWR switch is pressed, two things occur, the first is that +12V is applied via D1 to the gate of Q1, turning it ON. This pulls the gate of Q2 t...
by 5B4AIY
17 Jul 2020 10:36
 
Forum: Juma Discussion
Topic: Faulty Juma TRX2
Replies: 4
Views: 11375

Juma TRX-2 Firmware v6.00a

There is now a new version of the firmware for the Juma TRX-2 transceiver. This version adds the feature that allows adjustment of the Low-Voltage Pre-Limit trip value. Previously it was fixed at 100mV higher than the final limit value. NOTE: BECAUSE THIS FIRMWARE USES AN ADDITIONAL WORD OF EEPROM M...
by 5B4AIY
15 May 2020 10:46
 
Forum: Juma Discussion
Topic: Juma TRX-2 Firmware v6.00a
Replies: 0
Views: 11142

Juma TRX-2 Firmware v6.00a

THIS VERSION OF THE FIRMWARE WILL CAUSE A CHECKSUM ERROR ON INITIAL START-UP AFTER LOADING. THIS IS BECAUSE THE EEPROM MAPPING HAS CHANGED. MAKE SURE YOU RECORD YOUR CALIBRATION AND CONFIGURATION DATA PRIOR TO LOADING. There are pages at the back of the User Manual set aside for this. This version ...
by 5B4AIY
15 May 2020 10:38
 
Forum: Juma Firmware by 5B4AIY
Topic: Juma TRX-2 Firmware v6.00a
Replies: 2
Views: 11506
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