Radek Haša is a shortwave and airband listener living in Czech republic.
He decided to redesign the PCB layout and assembled a prototype of the BBRF103-2.
Thanks for allowing his project to be published.
While designing the PCB in Eagle 8.x format, he noticed and fixed some bugs in my layout.
- Referring to transformers T1,T2,T3. The Coilcraft WBC4-6TL type is better than the WBC4-1TL. The insertion loss is 0.65 dB instead of 1 dB. (WBC datasheet)
Note that terminals 4 and 6 of the primary winding are interchanged in the electric scheme and the SMD footprint used in the PCB. This does not affect performance and will be corrected in the future PCB version to match the original SMD footprint.
- The Q1,Q2,Q3,Q4 SMD footprint is corrected in RC3 PCB.
- C44 and C55 silkscreen locations are swapped in the BBRF103-2 original PCB. Footprint is corrected in RC3 PCB layout.
Prototype was tested on desktop PC equipped with Intel Pentium G4600 CPU and B150 chipset USB 3.0 hub controller. Hereafter some pictures of prototype under testing.
He made some test of temperature of the ADC and R820T2 in VHF mode.
“There are no heatsinks on ADC and R820T2. The temperature of the ADC reached 73 ° C while the R820T2 reached 60 ° C at 100MHz. Room temperature was 27 ° C.“
WARNING: notice that this description is a BETA test version without any warranty and is intended for non-commercial purposes.
Radek’s PCB design files can be downloaded here: http://www.steila.com/radek/BBRF103_2_RC3.zip
The archive contains:
Finally please notice that ExtIOsddc.dll ver 0.96 software does not yet control the antenna power via dll panel window and to enable VHF (R820T2) mode you must undefine _NO_TUNER_ in config.h and recompile.
email: ik1xpv AT gmail DOT com