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

Hambuilder SSDR100 prototype

This is the next Hambuilder transceiver (SSDR-100)
*. 3.2 inch TFT display
*. STM32F407 as display control and waterfall processing
*. ATMega8 (21st order FIR LPF processing)
*. Weaver SSB modulation and demodulation method using 2 x ADC MCP8201 and 2x DAC TDA1543
*. Embed CW decoder/Encoder using ATMega8
*. Bluetooth Access for setting, remote access and firmware upgrading
*. Android remote access Apps
*. 18 button access for band and control
*. 1 rotary main dial
*. 3 rotary for RIT/XIT, Bandwith Control and WPM
*. PC audio interface for digital mode
*. 80-100 Watt power out

Hambuilder Team

 

HBRADD1 for HBR4HF, CW Encoder-Decoder and Digital Mode set-line

HBR4HF memang menggunakan desain klasik dengan fitur yang umum saja. Beberapa rekan mempertanyakan mengenai absen nya mode CW dalam desain HBR4HF. Hal tersebut sebetulnya sudah masuk kedalam road map pengembangan yang sebetulnya sudah sangat lama di desain. HBR4HF memang dibuat sederhana sebagai pintu masuk kedunia HF dengan pertimbangan harga dan memang faktanya untuk amatir lokal rasanya masih sangat terbatas penggunaan mode selain SSB.

HBRADD1 adalah road map setline dari HBR4HF, mengapa dibuat terpisah, kembali ke alasan harga serta tidak semua amatir menggunakan CW, HBRADD1 juga memungkinkan di kembangkan dengan fitur GPS (APRS) bila nantinya mau dikembangkan untuk radio matirim yang murah. Pada BRHADD1 ini juga telah dilengkapi interface ke sound card PC bila rekan-rekan ingin bereksperimen menggunakan digital mode via PC sound card. Pada HBRADD1 ini juga di tambahkan 5 watt audio amplifer dengan loudspeaker yang besar melengkapi loudspeaker yang ada pada HBR4HF.

Spesifikasi :
*. ATMega8 as main controller for CW decoder and display
*. NE567 as tone decoder
*. ATTiny13 Iambic keyer and PTT control with buzzer tone
*. 16×2 character LCD for TX and RX CW encoder/decoder
*. 3-5 watt audio amplifer
*. 1 x 3.5 mm audio jack for Iambic keying input
*. 1 x 3.5 mm audio jack for sound card interface input
*. 1 x 3.5 mm audio jack for sound card interface output
*. 2 x 600 ohm audio transformer sound card in and out audio
*. 5 watt speaker
*. Dimension 200(w) x 60 (h) x 100 (deep) mm

 

 

Hambuilder Team

RTC03 + BritX (All Band SSB) + Wide BPF/LPF + RF-PA20(4xIRF510), Its almost complete now

I got many request from friend to listed full set of transceiver module on ebay. Its already pushing me hard to realize it as soon as possible. Really hard to worked with my “pneumonia” problem since last year, I didn’t smoke but its happen to me because the air conditioner bacteria. I have a full day jobs as a SAP consultant. Yes, It mean lot to do but I tried to build it as soon as possible, and this post is the progress.

Nothing new design of this BritX, its just some variance of famous BITX, I just added and replace some component exist on local, plus an audio band pass filter to make better audio in receiving. Everything is generic design but, my big job is to make all module work together in all band, its not easy, at least for me. After some PCB design, prototype testing, testing and again testing. Its worked now.

The transmit test result with 13.8v supply with dummy load after lowpass filter:
1. 160m 16.3Watt
2. 80m  17.7Watt
3. 40m  25Watt
4. 30m  20Watt
5. 20m 24Watt
6. 17m  22Watt
7. 15m 19.3Watt
8 10m 8.3Watt

Yes power out is getting low on the 10m band but its common for IRF510 mosfet. Using RD16HHF or RD70HHF will be a better with flat RF output on all band. For my friend thats already bought my RTC03 on eBay, please be patient this complete set will be list there soon.

RTC03 + BRITX + BPF/LPF + PA20

All Band BPF/LPF

All Band BPF/LPF

Regards
Dian Kurniawan

RTC03 Enclosure

Enclosure ini adalah jawaban atas beberapa request melalui email yang masuk mengenai enclosure, namun sebenarnya ini memang sudah menjadi bagian roadmap jalapindai/homebrewprtner/Hambuilder akhirnya enclosure RTC03 mulai diproduksi.

Enclosure ini memiliki ukuran 95 x 200 x 200 mm ukuran cukup minimalis. Enclosure ini terlah menyediakan

  • 1 x 4 pin CB connector untuk mic dan PTT
  • 2 x potensiometer untuk volume dan mic gain
  • 1 x toggle on off power switch
  • 1 x Antenna connector
  • 1 x 2 pin CB connector untuk power supply
  • 1 x fuse holder utk pengaman
  • 1 x aluminum heatsink

Kombinasi RTC03 dan endclosure menyebabkan homebrewer benar-benar fokus ke exciter, PA, filter dsb.

front-right-01


if you want to buy this enclosure please visit the link below

RTC03 Aluminum Enclosure on Ebay

Hambuilder Transceiver Road Map

Apa yang disampaikan pada tulisan berikut adalah hal yang sudah lama direncanakan. Berbagai masalah baik teknis maupun non teknis muncul menghambat realisasinya. Akhirnya walau sangat lambat satu persatu dapat terwujud.

Pada gambar diatas adalah prototype set line transceiver yang akan segera diproduksi. BR03 transceiver dengan spesifikasi berikut:

  • Menggunakan controller RTC03
  • 10/20 watt power out, dengan final menggunakan IRF510 (low cost power amp), optional menggunakan RDHHF16 dengan harga lebih tinggi
  • 5 set low pass filter, cover 160-10 m band
  • 5 set band pass filter, cover 160-10m band
  • Direct conversion with Weaver or Hilbert demodulation methode, menggunakan microcontroller STM32F103 atau STM32F03X, mirip dengan metode yang digunakan pada kebanyakan SDR.
  • Model awal hanya akan support SSB dan CW, sangat mungkin di kembangkan juga untuk AM dan digital mode

Pada bagian kiri dan kanan adalah setline dari Transceiver ini. Rencana sejauh ini setline dan accsesories bisa berupa:

  • Power Supply Unit dengan ouput 12 dan 24volt (untuk meningkatkan daya ouput MOSFET)
  • Speaker dengan DSP filter (200Hz-2.5KHz band pass filter, FIR filter)
  • Automatic Antenna Tuner (256 step Inductance dan 256 step Capacitance)
  • Pan Adapter (waterfall spectrum).. thanks to STM32F407 with DSP instruction.
  • RF Amplifier with digital SWR protector (100-300watt)
  • Etc

Semoga tidak ada masalah supply, import proses dan sebagainya serta tetap diberi waktu dan kesehatan