HBR10HF new board design with ADE-1 as RF mixer

Specification :
*. BRITX Based
*. Front End RF gain using 2SC2570
*. Front End RF attenuator
*. TX RF attenuator
*. ADE-1 main mixer (detachable)
*. Detachable ladder filter
*. CW generator/Key PTT delay on board
*. AGC on board
*. Band Pass Filter on board

By replacing main mixer with ADE-1 we can get very good carrier suppression, increase sensitivity, and we can get more TX power on almost band. We also added crystal ladder filter adapter, so it can be upgrade next.  You can replace the crystal with your mechanical filter (please take note the impedance matcing), or you can make variable BW filter by using varicap diode.

We decided to use separate RF amplifier board with LPF on it. We hope we can increase the power out, but still using the low cost MOSFET.

Dian Kurniawan
YD1OSC (ex YD6DEK)

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HBR4HF (RTC01C + BritX tranceiver) tunning

Similar condition with HBR10HF some buyer report carrier leakage on HBR4HF, same proble with his brother HBR10HF, BFO level is too big injected to modulator. Here’s the solution :

*. Replace BFO coupling from RTC01C with 100pf value
*. Tunning the preamp trimpot
*. Tunning the carrier balance
*. Adjust gate bias voltage (Vgate) into 3V

 

 

 

 

 

How ever please take note, power of the transceiver considering many thing not just increasing the final stage value. We must consider also the cabling, switch relay, PCB track and etc. HBR4HF and HBR10HF not designed to produce big power.

Hambuilder team

Tweaking BritX based Hambuilder exciter (carrier leakage #1)

For older version of britx based (BITX) Hambuilder transceiver some buyer reported carrier leakage during transmit, its also affect the microphone gain setting. Please find the attached document for missing part and revision.

Hambuilder team

Tweaking BritX based Hambuilder exciter internal speaker and headphone jack

First version of HBR4HF or HBR10HF are used hybrid microphone with loudspeaker. Basic idea using this is to reduce complexity and cost. also considering it as portable radio. How ever there’s a requirement to operate with external audio amplifier or external speaker for better audio receiving. The newest HBR4HF already have internal loudspeaker, and the newest HBR10HF already have audio jack also.

 


Hambuilder team

Lebih jauh tentang HBR4HF

HBR4HF didesain sedemikian rupa untuk memenuhi kebutuhan rekan-rekan di Indonesia yang lebih dominan beroperasi di low band HF (80-40m). Mungkin perlu juga dipertimbangkan regulasi yang membatasi rekan-rekan amatir dengan tingkat siaga bisa ikut mencicipi band-band lain di spektrum HF.

 

 

Berkebalikan dengan desain-desain sebelumnya dimana blok demi blok didesain pada PCB terpisah, HBR4HF menggunakan 1 keping PCB untuk fungsi-fungsi exciter, band pass filter, low pass filter serta RF power amplifier. Hanya controller yang terpisah mengingat PCB controller akan di pasang pada panel depan. Desain pada satu papan PCB menyebabkan tidak di perlukannya interkoneksi antar board. Pada gambar berikut terlihat item-item apa saja yang masih perlu disambungkan agar dapat berfungsi penuh sebagai satu transceiver.

 

Penampilan PCB HBR4HF setelah proses perakitan.

Terlihat ada 2 buah transistor IRF530 pada sisi PCB yang akan ditempelkan pada heatsink di belakang box. Bila diinginkan power out yang lebih besar, silahkan bereksperiment dengang mengganti MOSFET IRF530 dengan jenis yang lebih besar atau menaikkan tegangan kerja MOSFET final ke 24V, dengan catatan kerja MOSFET ini di pisahkan dengan tegangan kerja komponen lain pada PCB (pernah di coba dengan menggunakan 24V akan diperoleh power output 45Watt)

 

 

Salam

Hambuilder Team

BritX and HBRF01 listed on eBay

Dear All friend,

The exciter BritX and Combo BPF/LPF board listed on eBay, its your time to build your full system transceiver using hambuilder transceiver module

BritX exciter board on eBay

 

HBRF01 listed on eBay

 

Regards

Hambuilder HF modular transceiver (RTC03+BRITX+BPF/LPF+HBRPA20)

 

 

 

Transceiver Block

Hambuilder HF transceiver spec:

  • RTC03
    • 3.2 Inch TFT LCD
    • Si5351 synthesizer
    • VFO-BFO out
    • SSB/CW/AM/FM mode
    • 8 Band Control

 

  • BRITX-01
    • BITX based heterodyne transceiver
    • 10MHz IF
    • 300-3000 Hz audio band pass filter
    • Smeter
    • Agc

 

  • HBRF-01
    • 5 band BPF off 8 band control
    • 5 band LPF off 8 band control
    • 160m
    • 80m
    • 40m
    • 30m + 20m
    •  17m + 15m + 10m
    • IMG_20170717_095323

 

  • HBRPA20
    • 1x IRF510 driver
    • 4x IRF510 final
    • 0.5-1 watt input
    • 13.8V operation
      Test result with LPF and 50 ohm dummy load

      • 160m…….. 17 Watt
      • 80m ……… 15 Watt
      • 40m………. 19 Watt
      • 30m………. 16 Watt
      • 20m………. 22 Watt
      • 17m……….. 17 Watt
      • 15m……….. 18 Watt
      • 10m……….. 10 Watt

 

HBR TRX Connection 5

Hambuilder Team