QRP BRHF10 Prototype (receiver test)


  • BRitX exciter, based on BitX exciter with on board 2 to 30 Mhz fixed inductor BPF using FST3253 band switch
  • Small form factor (common component are smd)
  • RTC02B controller (2.2 TFT display) with special firmware
  • ABS enclosure with acrylic panel

This exciter will be power up with 10watt linear amplifier. using RD16HHF1, and RD00HHF1 as driver and  4 Band LPF

In the future there will be an additional daughter board to improve bitx performance like:

  • 3-5 Watt audio amplifer with AGC
  • DSP audio processing for speaker
  • DSP audio processing for microphone and also audio compressor


BRHF10 = BRitX + RTC02B


RTC02B external VFO

Another version of RTC02B as an external vfo. It is come with an abs plastic enclosure, 2 bnc rf out and dc jack connector.

This version was build to meet old channelled transceiver local oscillator replacement. So they do n ot have to open or do alot modification of their vintage transceiver.

BuildRadio HF transceiver prototype

Desain ekonomis Homebrewpartner/Jalapindai HF transceiver enclosure. Pada series ini tema yang di gunakan adalah “BuildRadio” untuk semakin menguatkan kesan homebrew/diy nya.


*. RTC02B as main controller (special firmware)

*. Single conversion heterodyne (smd Bitx variance)

*. 4 onboard BPF (2-4, 4-8, 8-15, 15-30 MHz) fixed inductor BPF

*. FST3253 bandswitch selector

*. 10watt linear Amplifier

RTC02B to BitX Oscillator connection

Ada beberapa pertanyaan masuk ke e-mail saya menanyakan bagaimana koneksi RTC02B dengan BitX. Saat ini bisa di katakan Bitx adalah board ssb trx homebrew yang paling populer di Indonesia. Oleh sebab itu saya akan gambarkan koneksi oscillatornya sebagai berikut. Bila karena satu dan lain hal sinyal oscillator terlalu kuat silahkan di tambahkan attenuator.



Berikut contoh video BITX menggunakan RTC02B (tapi tidak menggunakan BFO nya)


RTC03 (Radio Transceiver Controller with built in CW decoder/encoder)

RTC03 01b
RTC03 is the latest  Radio Transceiver Controller from Homebrewpartner/BuildRadio with specification:
*. 3.2 Inch TFT Display (480×320 pixel)
*. SI5351A Frequency Synthesizer
*. 8 band Control I/O with ULN driver (direct relay connect)
*. Modulation I/O control
*. CW decoder, PS2 Keyboard CW encoder
*. etc

tobe continued…

RTC02B (English) user Manual

Radio Transceiver Controller
Si5351 on board


  • Si5351 clock generator with 25/27 MHz Xtal
  • HF All band controller
  • BFO oscillator out
  • USB/LSB/AM switch control pin
  • IF bandwith control pin
  • AGC Fast/Low control pin
  • NB control pin
  • VFO A/B
  • CB mode channel
  • Voltage monitor, Temperature monitor, Fordward and Reflected reading
  • Alarm indicator and alarm driver
  • 6 onboard button
  • 1 rotary plus + push button
  • Fout 4X freq operasi (SDR mode)



mode button

  1. BAND button

Band selection

  • 160m =             800 MHz           –              1.999 MHz
  • 80m =             500 MHz           –              3.999 MHz
  • 40m =             900 MHz           –              7.249 MHz
  • 30m =             100 MHz         –              10.149 MHz
  • 20m =             000 MHz         –              14.349 MHz
  • 15m =             000 MHz         –              21.449 MHz
  • 10m =             000 MHz         –              29.699 MHz
  • 26m =             400 MHz         –              11.499MHz
  • CB =             965 MHz         –              27.405 MHz
  • ALL =                 500KHz         –         32.000 MHz

Each band have their own ouput control pin with active logic high 5V to pre-drive BPF dan LPF. Special for 26m the control band follow 30m band and CB will follow 10m band.

 Selected active band will store into micronctroller EEPROM after a few second.


  1. VFO A/B button

VFO A/B button used to choose active VFO A or B, each band have A/B sto selected VFO and will be store in microcontroller EEPROM after a few second.


  1. MODE button

MODE Button used to choode modulation (LSB, USB, CW, AM and SDR). This button will drive output pin for selected modulation out pin and or drive BFO frequency out. This modulation pin out will have 5V high logic pin to drive external BFO for example.

SDR mode mean no IF offset and multiply by 4, such as for tayloe need 4 times LO.

See Frequency out pin for more detail formula

Active mode will be store in microcontroller pin after a few second


  1. SETTING button (activated alternate function button)

Setting button used to choose setting function combine with another button

Push SET button then push following button
*. BAND, use to set Bandwith (BW) setting, if Band with (wide/narrow) , This will affect BW pin high or low logic for bandwith control

*. MODE, use to set AGC F(fast) or S (slow), this with affect AGC pin logic high or low for AGC control

*. A/B, use to NB, Noise blanker , this will affect NB pin logic high or low for Noise blangker control

 Push SET button to go back to dial mode

  1. DOWN/UP button

  Button UP atau DOWN use to auto scan up and down on selected band


  1. Button rotary DIAL

Button rotary dial use to choose operation frequency by left (down) or right (up).


  1. Button rotary PUSH DIAL

If we push the button rotary dial this will change frequency step for each rotary step.


RTC02B Initialization

 Factory Reset
Push SET button when powering on module until setup menu appear it will reset all EEPROM setting into factory default.

EEPROM Value setting

For the first time we need to set up the system such us correction value (calibration), IF and etc.
We need to push DWN button on start up until initialization menu show up. Below are step by step initialization set up. Push DWN button on start up did not reset tofactorey default value.

  1. Correction menu will show up as default initialization.

Default correction value is zero except already calibrate. If we dont want to set the new calibration value, just push DWN button to skip then go to other setup.
Read the vfo value on VFO out pin. If counter read value did not show exact 10MHz please do rotate dial button left or right until counter read exact. Then push DWN button for next step.

  1. IF SSB

IF SSB use to set up IF offset value, we need to rotate dial rotary button lef or right. We could push rotary dial button also to change step.
Then push DWN button for next step.

  1. IF CW

Same as above but for CW mode
Then push DWN button for next step.

  1. IF AM

Same as above but for AM mode.
Then push DWN button for next step.

  1. BFO USB

BFO offset for USB. Default value is 1500Hz (1.5KHz), we could rotate rotary dial button to change the value.
Then push DWN button for next step.

  1. BFO LSB

BFO offset for LSB. Default value is -1500Hz (-1.5KHz), we could rotate rotary dial button to change the value.
Then push DWN button for next step.

  1. BFO CW

BFO offset for CW. Default value is 600Hz, we could rotate rotary dial button to change the value.
Then push DWN button to exit Initialization step.. then restart (power on – of


RTC02B Connetion and pinout

  • 12V supply pin (beware coneccting this pin)


  • Output pin

This pin have digital logic high (5V) when active and logic low (0V) when not active

  • Alarm pin (K2.0)
  • Band control pin (K2.1 – K2.3)(10m, 15m, 20m)
  • Band control pin (K3.0-K3.3)(30, 40m, 80m, 160m)
  • Mode control pin (K9.0-K9.3)(AM, CW, USB, LSB)


  • Frequency out pin
    • OUT FREQ (VFO out)

VFO out = IF + Display Frequency + SSB BFO offset

  • OUT IF (BFO out)

BFO out = IF – SSB BFO Offset

  • RX/TX input pin

This digital input in will accept 5v as RX state and 0V as TX state.
RX state wil drive LCD display to show RX state and set up VFO value according to rx state, special for AM mode, will offset RX vfo to AM IF. This wil also drive microcontroller to read s-meter value (see ADC input s-meter).

TX state will drive LCD display to show TX state and set up VFO value according to tx state, special for AM mode will not offset TX vfo to AM IF. This will alos drive microcontroller to read fordward (FWD) and reflected (REF) value (see ADC input pin REF/FWD)

  • ADC input pin

This input pin accept 0-2.56 DC volt input. Please be aware to to exceed the value. It will damage the Microcontroller.

  • Temperature input (0-2.56V)

Connect this pin into LM35 sensor temperatur (sold separately). Then glue it into Power Amplifer heatsink to read heatsink temperature.

LM35  Precision Centigrade Temperature Sensors



  • Vbatt (0-2.56V)

Connect this pin trought 10K trimpot/potensiometer to read supply voltage then do calibration with other voltmeter


  • REF (0-2.56V)

Connect this pin into SWR pickup reflected out then do calibration.

 pick up 1


  • FWD (0-2.56V)

Same as above but for fordward out.

 pick up 2

This is “KitsandParts” SWR pickup

  • S-Meter (0-2.56V)

Connect this pin so s-meter buffer then do calibration. (replace analog meter then connect it to microcontroller s-meter input) see example below


connection 01

BEO SSB Transceiver

BEO SSB transceiver adalah sebuah SSB Transceiver yang bekerja pada 40m band, karya dari OM YD3FSI. Transceiver ini menggunakan IC LA1185 atau sejenisnya sebagai mixer. Kesederhanaan dan kemudahan perakitan adalah salah satu kelebihan BEO. Relatif hanya ada satu buah lilitan yang perlu dibuat oleh perakit di PCB exciter nya. Menarik untuk yang kurang suka menggulung lilitan.

*. menggunakan LA1185 sebagai mixer
*. menggunakan trafo IF biru sebagai BPF
*. PC menggunakan MOSFET IRF510/520
*. 8MHz IF ladder (4-Xtal)
*. 74HC4053 sebagai RX/TX switch

catatan dari saya untuk BEO adalah sensitivitas nya cukup baik, namun suara ada baiknya di tambahkan 1 tingkat lagi penguat untuk meningkatkan output cukup dengan tambahan 1 buah LM386 lagi suara sudah cukup kuat. Perlu ditambahkan satu buah transistor pada input penguat audio untuk meredam suara mencuit pada saat peralihan TX dan RX.

Secara keseluruhan BEO layak untuk dirakit/dimiliki baik oleh pemula maupun homebrewer yang telah berpengalaman. Tidak ditemukan kesulitan berarti dalam merakit BEO.

BEO skema20160128_10413520160128_104106

Untuk rekan-rekan yang ingin mencoba merakit PCB BEO bisa diperoleh pada link berikut