Saturday, August 27, 2016

Listening to QSO with mcHF + EFHW antenna

Listening to QSO using my mcHF that I build from the kit form. I am very pleased with the RX quality using my DIY EFHW antenna erected using 2 fishing pole at the backyard. The transceiver had most or more of the mod that is implemented in version 0.5

Power out is set to 10W max for full power on all band. Driver transistor is replace with BFQ18A and the PA output transformer is from KA7OEI / SV4AM. USB port is modded by adding the 5V lines for USB stick firmware upgrade. Bootloader is now 2.0.0 with ver 1.2.0 firmware.
Touch screen mod is done. Next will replace the STM32 to STM32F429VIT6 or STM32F439VIT6 for more memory space for future firmware upgrade that is currently in the works by Andreas (DF8OE) and the team.

Tuesday, April 26, 2016

How to remove hot glue - without a mess

Have you ever tried removing hot glue from your diy projects such as PCB, inductor or perhaps your workbench and ruin it? You tried to heat it up hoping that it will melt and easy to be removed but little did you know you are actually creating a hell of a mess..

Well, I tried this method which I found on Google. All you need is:

1. IPA (Isopropyl Alcohol)
2. Cotton bud
3. Some tools like long nose plier or a tweezer.

Step 1.
Soak the cotton bud with IPA

Step 2.
With the soaked cotton bud, apply the IPA on the glue surface, side and bottom and wait about 10 seconds.

Step 3.
Applied the IPA again if you see some part already lifted up. You want the IPA to seep under the glue.

Step 4.
With the plier or whatever tools you have depending on the glue bead size, try prying it or lifting the glue with a little force. Tadaaa....

Happy cleaning folks!!

Sunday, April 10, 2016

Sunday, March 06, 2016

mcHF QRP Transceiver - build update

I managed to continue soldering all the SMD components and connectors for the RF board.
I still have coils to make. This will be done later as I am waiting for the LC meter to arrive via slow boat from China. I must say, to hand solder SMD components is a great challenge to my eyes.. I have to be creative by using magnifying glass.

Thursday, February 25, 2016

mcHF QRP Transceiver


  • Standalone and compact embedded transceiver
  • CW, SSB, AM and FM – transmit and receive
  • 300/500 Hz CW and 1.8/2.3 kHz SSB filters with adjustable passband centering
  • 3.6 kHz “wide” filter plus 5, 6, 7.5 or 10 kHz “extra wide” filters for SSB/AM reception
  • SSB/AM Transmit Speech processor
  • DSP noise reduction
  • DSP automatic notch filter
  • Spectrum scope
  • Waterfall Display
  • Highly configurable with a wide variety of menu items

Available from itself.

You have the choice of buying a blank pcb or a partially completed pcb with all the necessary components to complete it. But without enclosure, buttons, knob, speaker and final FETs.

I decided to get the partially assembled pcb kits and it has arrived to my door step last week. I have started to assemble and solder all the components (SMDs) for the UI board and have loaded the bootloader and firmware. So far, the UI board seems to work. I will have to complete the RF board before can fully test it.

The RF board had the most components to be soldered (SMDs). For this, I have a reason to get a new soldering station after been using my 15 years old soldering iron. The RF board will take sometimes to complete and I am also waiting for the final FETs to arrive.

Just to share, this project is not for the faint hearted and ability to solder SMD is a requirements. They are so many notes and modifications available, right from hardware to firmware. Reading is highly recommended and its good to start with one of the groups which is in English at