HBR4CW 4 Band CW QRP transceiver

Beberapa rekan baik dari dalam dan luar negeri menyatakan ketertarikan akan perangkat QRP yang beroperasi hanya pada mode CW. Mereka terarik dengan design yang simple, kompak dan hemat daya. Setelah melakukan riset perbandingan dan pertimbangan ketersedian komponen, proses perakitan dan sebagainya, Hambuilder mencoba mendisain jawaban atas kebutuhan tersebut dengan spesifikasi sbb:

*. 16×2 LCD Display with auto-off back light
*. Atmel Microntroller
*. Si5351 synthesizer
*. built-in iambic firmware with WPM setting
*. optional menu for iambic or direct key
*. No mechanical relay used

Operation Band :
*. 40m
*. 20m
*. 15m
*. 10m

RX :
*. SA602 sebagai mixer dan demodulator dengan pertimbangan built in gain besar
*. Xtal ladder filter yang di desain dengan bandwidth sempit sesuai kebutuhan CW
*. opamp sebagai audio CW filter
*. RX gain setting, mungkin ada penambahan front end gain amplifier (MMIC?)
*. audio agc

TX:
*. 5W output
*. IRF510 as final transistor
*. 5 pole LPF

Sebetulnya tidak ada teknologi RF baru untuk desain ini, fokus pada simplikasi dan daya, plus harga.
Ada kemungkinan sekaligus battery pack. Atau di coba accessories lain sepeti SWR+ATU, QRP antenna? kita lihat perkembangan nantinya seperti apa, mudah2an peminat di lokal juga semakin banyak. Semoga bisa segera direalisasi

Hambuilder Team

HBR4HF latest upgrade

Hambuilder continues to improved the HBR4HF board, feature and specification time to time:
*. additional RF front end amplifier using MSA-0886 with 30db gain.
*. additional potensiometer for RX gain.
*. narrow band pass filter for RX/TX to increase selectivity on RX and to remove unwanted spur and harmonic on TX at the early amplifier stage cause of IF frequency.

80m

40m

40m

30m

20m

*. more matching impedance port on the circuit around the main mixer ADE-1.
*. independent band TX gain setting increase power out on the higher band. Now we got 15-20W on 30m and 20m instead only 10W on previous version.
*. firmware of controller now support IAMBIC key-er with programmable WPM.
*. new PCB with capable to using more bigger power transistor and bigger binocular transformer space, but we must consider the heat-sink size that will increase the shipping cost.

Actually we have many plan to upgrade and many new feature, but this Covid-19 pandemic situation we have a big logistic and supply chain problem. Its difficult to get the component, we must used express shipping company with so high shipping cost, and also our team must work from home. So we decided to choose the improvement with the minimal effort and with minimal cost we can afford for now. ..for example only 1 gr over-weight we must paid additional cost for 500gr, I hate this shipping company (D*L)

 

 


ebay link for HBR4HF HBR4HF on ebay

Hambuilder Team

 

Hambuilder transceiver family

According to our idealism, vision and mission the diagram below will show our transceiver product family. We must plan and considering many things. Our “micro team” must works 15 hours a day (ganbatte kudasai). Yes we made an error and mistake, bad purchase, bad communication and etc. Not perfect but try to improve in every way.

Hambuilder transceiver classification by power:
*. 0-25 Watt
*. 25-50 Watt
*. 50-100 Watt

Hambuilder transceiver classification by display:
*. 7Segment
*. 16×2 character LCD
*. 2.2 Inch TFT LCD
*. 3.2/3.5 TFT LCD
*. 5.0 TFT LCD
*. 7.0 TFT LCD

note: some transceiver are on development, some are ready on our web-store/e-commerce

YD1OSC & Hambuilder Team

HBR4HFS, another 4 Band Series with 100Watt max power ouput

HBR4HFS, is another 4-bander’s series from Hambuilder. It is a medium size desktop transceiver with big enough power. We try to keep it low cost, simple to operate and simple to maintain. This item actually an upgraded power of HBR4HFN with previously providing maximum 50W power out by using 2x IRF530 as the final transistor. We can still adjust the power out to QRP level (below 10W) if required.

specification :

  • 2.2 Inch TFT Display
  • ATMega128 microcontroller
  • ADE-1 main mixer
  • Up to 100W power out at 80m and 40m, 90W at 30m, 35W at 20m
  • RX gain setting
  • TX gain setting (power out adjusting 0-100W)
  • Mic gain setting
  • Auto sensing Fan
  • 2 x IRFP150 final transistor
  • Morse generator, with ATTiny13 microcontroller

This item will be available to buy soon in our web-store, Tokopedia, Bukalapak and ebay.

Hambuilder Team

RTC35, Radio Transceiver Controller with spectrum/waterfall

Sambil mempersiapkan produk-produk selanjutnya pilihan layar display selalu menjadi dilema. Pengalaman yang lalu menyebabkan beberapa produk akhirnya batal/ditunda karena LCD yang di kembangkan discontinue. Pasar componen di China memang menarik dan murah tapi tetap mesti berhati-hati karena bisa discontinue setiap saat. Membeli langsung ke pabrik mengharuskan dalam jumlah banyak dan harga diatas rata-rata diecommerce seperti aliexpress/ebay dan lainnya.

Perubahan jenis LCD menyebabkan firmware mesti diprogram ulang, yang kadang-kadang bisa cukup besar dan perlu library baru. Berikut adalah LCD TFT 3.5 Inch yang diharapkan menjadi display produk-produk Hambuilder ke depan. Tegangan kerja 3.3V dipilih karena akan dioperasikan oleh microcontroller STM32F407, atau ArmCortex M4 lainnya. Microcontroller akan di operasikan pada clock 168MHz.

Specification dan fitur-fitur yang di rencanakan:
*. 3.5 inch TFT display. 480×320 pixel
*. STM32F407XX microcontroller
*. Audio DSP
*. Morse DSP
*. CAT interface
*. USB/Bluetooth interface, wifi?
*. 14-24 matrix/keypad
*. switch rotary/optical rotary encoder
*. swr reading/swr analyzer built in
*. ATU driver built in
*. Digital potensiometer
*. Radio bus/pheriperal control
*. Independent band setting
*. … still continue


DianKurniawan
YD1OSC