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Re: PA-100D Bias adjustment is only 300ma

Hi Adrian,

Thank you for such a nice detailed description of the operation of the bias circuitry. I am so greatfull for your effort.
I will be looking into the problem some time today. I am sure that this analysis will help many others also.

73's, Robert KH2BR
by KH2BR
27 Apr 2012 17:09
 
Forum: Juma Discussion
Topic: PA-100D Bias adjustment is only 300ma
Replies: 2
Views: 4217

PA-100D Bias adjustment is only 300ma

My new amp is working ok except for the bias adjustment. The manual calls for 500ma but all I can get is 300ma. Is this ok? If not, what should I look for?

Robert KH2BR
by KH2BR
12 Apr 2012 06:17
 
Forum: Juma Discussion
Topic: PA-100D Bias adjustment is only 300ma
Replies: 2
Views: 4217

Re: Juma TRX2A - Voltage supply problem in Main Board

Hi Saku, I took a good look at the photo that you posted of the main board section A-10 and A-11. Then I enlarged the picture so I could see it better. Saku, the board is badly contaminated and needs to be carefully cleaned of all solder and flux residue. I use Alcohol and a tooth brush. Use a magni...
by KH2BR
28 Feb 2012 16:53
 
Forum: Juma Discussion
Topic: Juma TRX2A - Voltage supply problem in Main Board
Replies: 17
Views: 27271

Add line level output to TRX2 Aux connector for Digi modes

I have always enjoyed using Ham Radio Deluxe and DM780. I wanted an easy way to get audio line level output via the TRX2 AUX connector. I placed one lead of a 0.1uf capacitor at the junction of IC10 pin 5 and capacitor C74 on the main board. A short wire is connected to the other lead of the capacit...
by KH2BR
07 Feb 2012 16:44
 
Forum: Juma Discussion
Topic: Add line level output to TRX2 Aux connector for Digi modes
Replies: 0
Views: 4550

Re: Juma TRX2 Firmware, Version 1.07u Build 12

Updated firmware, now working Great. Using Kenwood cat now and very happy with it so far. Thanks for such a great radio and software.

Robert, KH2BR
by KH2BR
11 Jan 2012 21:45
 
Forum: Juma Firmware by 5B4AIY
Topic: Juma TRX2 Firmware, Version 1.07u Build 12
Replies: 4
Views: 9535

Re: Juma TRX2 Firmware, Version 1.07u Build 12

Thank you Matti, I found the file. I did not know I had to extract that one particular file from the zip folder. In the Manual, Under the Boot loader section, it says that " you must replace the original file (ibl_dspiclist.xml) with this file ibl_dspiclist.xml" There is no hyperlink there...
by KH2BR
11 Jan 2012 15:51
 
Forum: Juma Firmware by 5B4AIY
Topic: Juma TRX2 Firmware, Version 1.07u Build 12
Replies: 4
Views: 9535

Re: Juma TRX2 Firmware, Version 1.07u Build 12

Do you have a hex file for version 1.07u ?
There is one for version 1.06
This would be my first attempt at updating the firmware. I looked at the zip file
and there are sure a lot of files there and I dont know how to turn it into a hex file.
Thanks, Robert KH2BR
by KH2BR
11 Jan 2012 04:02
 
Forum: Juma Firmware by 5B4AIY
Topic: Juma TRX2 Firmware, Version 1.07u Build 12
Replies: 4
Views: 9535

Re: Juma TRX2A - Voltage supply problem in Main Board

I looked at mine and it appears that you have them 180 degrees out of place. the sloped side is to the back of the radio.
Robert KH2BR
by KH2BR
06 Jan 2012 21:23
 
Forum: Juma Discussion
Topic: Juma TRX2A - Voltage supply problem in Main Board
Replies: 17
Views: 27271

TRX2A Power out falls off, Sub Harmonic.

After my first cw contact, I noticed that the power output was falling down. The back of the radio was very hot and I think that is because of the back plate its self. It is not like the one I see in the pictures. My back plate is made of double side PC board that has holes in it. I think the heat s...
by KH2BR
06 Jan 2012 03:01
 
Forum: Juma Discussion
Topic: TRX2A Power out falls off, Sub Harmonic.
Replies: 1
Views: 3905

Re: Juma TRX2A Low Mic Gain. Problem soved.

Thank You Matti,

The Microphone element was installed backwards and now the radio functions 100%.

73's, and Happy New Year

Robert KH2BR
by KH2BR
03 Jan 2012 18:12
 
Forum: Juma Discussion
Topic: Juma TRX2A Low Mic Gain
Replies: 3
Views: 6800
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