HBR10HF intermittent blank or gray/white LCD on start problem solving

Hambuilder HBR10HF using RTC03 as controller with 3.2 (320×480) TFT LCD. This item worked very nice, good color,  viewing angle, speed (using 16 bit parallel data). But the main problem is the availability is a night mare. I using this TFT since early 2016 when I started to build the RTC03.  Until now, this TFT already have 3 difference controller in market, with 3 difference firmware and specification and the worst is, seller from China that I bought this TFT did not know and did not help what kind controller or even give me any datasheet. I must find out by my self how to make this LCD works.

its look same but they have difference


when you look at their back side its HX8357C, V2.0 and blank, its all false
The HX8357C using ILI9481, the V2.0 using HX8357D and the blank one using HX8357C.
They need difference firmware and have difference command, and what I want to tell here is they have difference habit and speed. The blank one do not need hardware reset, but the other one intermittent required. This habit make your RTC03 sometime show the white or gray or even blank display on start.

How to solved this problem? actually is very easy (this bug already solved on our production line), please check the image below. We just need to added R-C reset delay. please see the picture below


and implemended like this on your RTC03, I choose R 10K and C 100nF.


Then when you get your RTC03 with intermittent gray or white screen on start you can applied this solution.

Best Regards
Hambuilder team

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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

HBR4HF – Hambuilder 4 Band HF Transceiver

HBR4HF specification

  • Heterodyne 10MHz Xtal filter exciter based on Hambuilder BritX exciter
  • 300-25000Hz audio band pass active filter using NE5532
  • 4 Band coverage (80m, 40m, 30m, 20m) with 3 selector LPF BPF
  • 20-35 watt RF power output,
  • 2x IRF 530 Final RF amplifier
  • SSB modulation
  • 16×2 char LCD
  • Si5351 VFO and BFO synthezyzer based on RTC01C controller

 

 

 

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

RTC01C Enclosure prototype

Melanjutkan pengembangan RTC01C berikut adalah salah satu protoype enclosure RTC01C. Pada prototype in masih menggunakan plastik abs sebagai bahan dasar, namun pada produksinya direncanakan untuk menggunakan aluminun sebagi bahan dasarnya.

Ukuran di perkirakan 6 x 20 x 20cm, diharapkan cukup kompak tapi bisa menampung
*. sebuah board exciter seperti bitx,
*. PA (10-20watt),
*. 5 band set LPF + BPF
Rasanya masih cukup kecil dan ringan apabila hendak dibawa portable.

Diharapkan akan muncul setline nya berupa Power amplifer hingga 80 watt dan antenna tuner L-C plus pick up SWR nya juga dengan LCD 16×2.

Berikut bentuk nya yang minimalis, khusus mic amplifier, dan agc pre setting saja tidak disedikan lubang pada panel untuk mengatur hal tersebut.

0403050102

QRP HBR-HF10 Prototype (receiver test)

Specification:

  • 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

This exciter availabe now in Indonesia, please visit to buy it..
https://www.tokopedia.com/jalapindai-store/britx-hf-exciter-board

’73

BRHF10 = BRitX + RTC02B

Homebrewpartner RTC02 v1.0

Setelah sekian lama dibangun akhirnya RTC02 v1.0 siap release.
Buat rekan-rekan yang ingin membangun radio transceivernya sendiri dengan rasa pabrikan.
RTC02 cocok untuk digunakan pada modifikasi FT180A, BITX, BIXEN, BLEKOQ QRP dan lainnya

RTC02 v1.1

RTC02 v1.1

Spesifikasi:
*. ATMega128 128Kb Flash
*. 7 Band + 1 direct control total 8 bit I/O
*. 4 channel digital I/O USB-LSB-CW-AM pin control
*. 1 channel analog I/O S-meter read out
*. 2 channel analog I/O FWD-REF read out, with SWR display
*. 1 channel analog I/O Voltage read out
*. 1 channel analog I/O Temperature read out (LM35)
*. 1 channel digital I/O IF bandwith control (wide/narrow)
*. 1 channel digital I/O Noise Blanker control (on/off)
*. 1 channel digital I/O AGC control (slow/fast)

*. HAM mode with 7 band (160m,80m,40m, 30m, 20m, 15m, 10m)
*. Emergency band 26m
*. CB mode with 200 channel (40×5 channel)

RTC02 with panel

RTC02 with panel

RTC02 display

RTC02 display

RTC02 test running

RTC02 test running

RTC02 inter koneksi dengan Transceiver

RTC02 inter koneksi dengan Transceiver

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