New HBR4HF released

New HBR4HF is a compact 4 Band HF transceiver.
This simple and low cost radio is also suitable for entry level HAM to start do communication on HF band.

*. Assembed unit, tested and ready to use.
*. New 2.2 Inch TFT display,
*. 4 amateur band (80m, 40m, 30m sharing filter with 20m)
*. TX covering 80m/40m/30m/20m,
*. RX covering 3.5-14.5 MHz,
*. Step 1Hz, 10Hz,100Hz,1KHz,100KHz,
*. Output 13.8V 45-50W,
*. CW SSB modulation with 700Hz tone,
*. Display VFO A/B, mode, Smeter, Band, RX/TX.
*. IF Freq 11.059.200.

Band Coverage (programmable) :
80m (3.500.000 – 4.000.000)
40m (6.000.000 – 7.250.000)
30m (10.100.000 – 11.500.000)
20m (14.000.000 – 14.349.999)

*. Exciter complete set
*. DC chord
*. Condenser Microphone

store link New Hambuilder HBR4HF



Hambuilder Team


Hambuilder booth at “Bandoeng – Netherlands” Amateur Radio Fair 2018 (23rd-25th March)

Thank you for visiting our booth and spending time to review our product on “Bandoeng – Netherlands” Amateur Radio Fair 2018 (23rd-25th March)


Thank you for visiting us and making your first purchase! We’re glad that you found what you were looking for. It is our goal that you are always happy with what you bought from us, so please let us know if your buying experience was anything short of excellent. We look forward to seeing you again on next Hamfest.

Hambuilder Team

HBRM3 Hambuilder iambic keyer

This iambic keyer have a lot improvement since the first one (V1.0). Gold painting on aluminum enclosure make this keyer look more attractive and robust. Stacked transparent acrylic structure cut by Co2 laser and CNC as mechanical part.

Inside the aluminum enclosure ATTiny13 microcontroller works as main controller for dit dah switch and reading ADC voltage from potensiometer (voltage divider) to measure the speed.





*. ATTiny13 microcontroller
*. adjustable speed
*. transparent acrylic paddle
*. gold painting aluminum enclosure
*. 9V battery operated
*. aluminum enclosure dimension 100mm x 85mm x 25mm
*. total dimmension with paddle and knob 145mm, 85mm x 50mm
*. 250gr weight
*. LED indicator


Hambuilder Team

Sayonara eBay!

After 2 years we tried to provide resources for HAM tools/component, which based on our experience will help and make HAM experiment more interesting and more easier we decide to say good bye to eBay. By 1st January 2018 we closed our store on eBay. We will continue to do experiment and do creative thing to make our hobby getting nice and better. We will launch and operate our web page at that currently not fully operated yet (so sorry if you have visited this site but did not get the proper response). We hope by running this web by the end of this month, we could give better service and support.

Our road map for this year is:
*.  increase the performace for our existing exciter (HBR10HF, HBR4HF and HBR1HF)
we will develop new PCB or additional daughter board consist of
*. accurate AGC (AD603? or similar)
*. accurate S-meter (AD8307)
*. accurate SWR reading (AD8307)

*. adding optional roofing filter
*. adding simple digital audio filter
*. get more RF amplifier power output (we reach 50 watt now)

*. Continue instrument development (Antenna Analyzer that always missed LCD stock we got new vendor now)
*. Antenna Tuner (semi automatic)
*. RF amplifier protector
*. Standalone SDR transceiver

There’s a lot homework we must do

Hambuilder Team

Why BITX based?

RF mixer is a key building blocks in transceiver design. I tried several popular active mixer such like SA602, TA7358, MC3362. I never tried DBM until Om Farhan (V2ESE) introduce the BITX and its very success.  Then I tried to build the BITX also by my self. I amazed its works on the first try. Based on my experience and comparing to other active mixer, for me BITX with its DBM is very stable. The design is straight forward, simple and easy to understand, the schematic actually describe basic function of each block on transceiver design. In my believing by choosing high quality component on BITX we can build high quality transceiver. In other case using low cost component we can build low cost transceiver without loosing the quality too much. This design is very compromise. Of course if your target is middle bass or high quality audio, crystal clear audio, do not choose BITX. There’s a lot transceiver with build in DSP. What do we expect on 3KHz bandwidth? I lost my hearing capability for frequency upper 3KHz when I work at utility department that assign me to handle 8 unit 1MW SKF and 2 unit 0.5 MW Niigata genset. So for my ear BITX is more than enough.

Why I see BITX is simple and straight forward? let we see heterodyne RX diagram below :

This diagram is really similar for each block what is inside RX chain BITX.

please visit Om Farhan web for circuit description
and a posting from, and also a lot BITX discussion on internet about it.

I capture what Om Farhan said about this half of bidirectional amplifier circuit  ( This circuit is repeatable 6 times similar, may be little bit difference on some stage coupling.

For me BITX is a good entry point to learn and to get a little more exposure about RF design without too much doing math calculating. We just need to choose or put alternative component, give some additional of feature and try and try. You can easily modified or enhance but I cannot found any better explanation about building transceiver like what Om Farhan did, the simplicity and functionality.

Two thumb up for Om Farhan!

Hambuilder Team