JUMA Amateur Radio Forum

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...

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...

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...

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...

It is quite straightforward to get the PA-100D to automatically change bands when operating with the KX3 or the FT-817. There are two basic methods: 1. FREQENCY SENSE Select the F-SENSE mode in the User Configuration menu. With this mode selected the PA-100D will measure the frequency of the incomin...

Hi, Whitney, Whilst there are no 'official' PA-100D firmware updates, I have been modifying and enhancing the software for this amplifier for some time, and if you were to load my latest firmware, then you will indeed have the capability for the Elecraft KX3 to automatically control the amplifier. T...

In providing some assistance to various constructors over the years, I have often been asked what is the typical current consumption of a correctly adjusted Juma TRX-2. Attached is a PDF giving the current consumption measured using my transceiver under various operating conditions. Hopefully this w...

Hi, Mike, Glad to have been of some assistance. I had forgotten that when you wish to flash the firmware, you need to jumper the power switch, thanks for reminding me! The latest firmware is version 3.00 Build 1, which adds the remote control capability, you can find it on the section of the website...

Hi, Mike, I am posting some swept SWR plots I took of my amplifier. It is perfectly normal for the SWR to be higher when the gain is set to G4. Bear in mind that the presence of an input attenuator will mask SWR problems, and indeed is a common microwave technique for 'improving' the SWR. Provided t...

Hi, Mike, The in-circuit programming connector is J9, and pin 1 is closest to the microprocessor chip, IC9. The error message you are getting means that the PicKit-3 has not detected the presence of the +5V from the board. Note that when you connect your programmer, it will be upside down and so you...