Search found 180 matches

Return to advanced search

Re: DDS and PIC soldering on TRX2A DDS board

Hi, Alain, I used RMA (Rosin Mildly Activated) flux that I obtained on eBay. It has the brand name of Powerfix, and is to DIN EN 29454-1, and is manufactured by Abraham Diederichs GmbH & Co, Oberkamper Strasse 37-39, D-42349, Wuppertal, Germany. This flux is a soft, light honey coloured paste, a...
by 5B4AIY
14 Jun 2017 14:00
 
Forum: Juma Discussion
Topic: DDS and PIC soldering on TRX2A DDS board
Replies: 4
Views: 1260

Re: DDS and PIC soldering on TRX2A DDS board

Hi, Alain, I am sorry that you encountered such difficulty in mounting the DDS and PIC chips. I would agree that these are the two most difficult aspects of the assembly, and, as you have discovered, there is no room for error. I can only speak for myself, but having made a similar mistake as you, f...
by 5B4AIY
14 Jun 2017 05:57
 
Forum: Juma Discussion
Topic: DDS and PIC soldering on TRX2A DDS board
Replies: 4
Views: 1260

Re: TRX2A Main Board short diagnostic

Hi, Frank, You are right, there is no mention of this in the constructional notes I sent you, and indeed, to try and write a document to diagnose every fault is clearly impossible, there are just far too many variables to deal with. In this case you will have to try and discover what is drawing the ...
by 5B4AIY
31 May 2017 12:37
 
Forum: Juma Discussion
Topic: TRX2A Main Board short diagnostic
Replies: 5
Views: 1487

Re: TRX2A Main Board short diagnostic

Hi, Frank, You still have a problem. The major current consumption is by Q1 and Q2 on the receiver section if you have recent (Revision C) main board, or the Spur Elimination module if an older version. These two transistors consume about 13mA to 15mA each. the rest of the integrated circuits fed fr...
by 5B4AIY
31 May 2017 06:54
 
Forum: Juma Discussion
Topic: TRX2A Main Board short diagnostic
Replies: 5
Views: 1487

Re: TRX2A Which screws?

TRX2 Front Panel.JPG Hi, Frank, I am attaching a photo of the front panel of my Juma TRX-2. You will note that the DDS board is secured to the front panel by means of a threaded spacer, illustrated in your parts list, and identified as a 12mm M3 'spacer screw', which is secured to the DDS board. Th...
by 5B4AIY
22 May 2017 10:02
 
Forum: Juma Discussion
Topic: TRX2A Which screws?
Replies: 4
Views: 1407

Re: Problem with F-Sense not detecting Band

PA-100D - 2.jpg PA-100D - 1.jpg Hi, Attached are two images showing the PA-100D in the F-Sense mode displaying both the input frequency and power, and the AUTO Band Select Mode correctly selecting 14MHz, this is with version 3.00c Build 3 of my firmware, showing that the software is correct. The '?...
by 5B4AIY
22 Apr 2017 11:47
 
Forum: Juma Discussion
Topic: PA100-D Problem with F-Sense not detecting Band
Replies: 5
Views: 1495

Re: PA100-D updates

Hi, Roland, Yes, you can safely upgrade from your 1.05k, which is quite old now, to the most recent version, 3.00c/Build 3 - with one caveat - you must make a note of your existing calibration and configuration settings prior to loading this latest version. This is because of two factors, a. The EEP...
by 5B4AIY
19 Apr 2017 07:57
 
Forum: Juma Discussion
Topic: PA100-D updates
Replies: 6
Views: 1731

Juma TRX-2 v3.00a Build 24

OH8FIU has very kindly informed me of a bug in the previous build (23) of this firmware which fails to cancel the frequency offset from the RX mode when in TX. This affects the CW/CWR modes. My sincere apologies for this oversight on my part. Please go to my section of the website and download the n...
by 5B4AIY
11 Apr 2017 08:54
 
Forum: Juma Discussion
Topic: Juma TRX-2 v3.00a Build 24
Replies: 0
Views: 871

Re: Juma TRX-2 V3.00a Build 23

You are so right, I sincerely apologise to everyone for this oversight on my part, and thank you for bringing it to my attention. Build 23 has now been removed and replaced with Build 24 which fixes this problem. It was caused by a 'minor' movement of some code, but I omitted to include the offset c...
by 5B4AIY
11 Apr 2017 08:44
 
Forum: Juma Firmware by 5B4AIY
Topic: Juma TRX-2 V3.00a Build 24
Replies: 3
Views: 2848

Re: PA100-D Firmware update

Hi, Guntram, This error is because this dynamic link library file is missing from your computer, or has somehow been corrupted. I suggest you search the web, you will find a number of fixes available. Be careful about simply downloading this file from a strange web site as it could easily be infecte...
by 5B4AIY
09 Apr 2017 07:26
 
Forum: Juma Firmware by 5B4AIY
Topic: PA100-D Firmware update
Replies: 2
Views: 1741
PreviousNext

Return to advanced search

cron