RF Capture Hardware
This is a sub-doc about ADC's & SDRs that can be used for the decode projects this list includes standardised and currently being worked on methods.
1khz to 40mhz range SDRS so 20msps+ effective sampling units, lesser units are also handy for testing and HiFi however.
28.6msps 8-bit / 40msps 8-bit / 54msps 8-bit
This has been further improved with external amplifiers.
- Software Defined Crystal Rate
- Hardware Synchronised Multi-Card Capture
- Hardware Synchronised Linear/Baseband Audio Capture
The most advanced mod available today, using an external crystal timing source we can have drift free capture with 2-4 CX Cards and audio feeds.
This allows duel channel video formats such as Betacam to be captured, or Video FM + HiFi FM + Linear for many other formats like VHS or Betamax.
Possible thanks to cxadc-clock-generator-audio-adc By Rene Wolf
External crystal timing via 2 additional PCB boards, a Jig with an SMA and Mainboard has allowed for under 50USD multi card sync, using 2 or more CX Cards alongside a extra input for synchronised Linear/Reference audio capture also has a extra input for headswiching timing signals.
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Raspberry Pi Pico as the interface and control board.
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Adafruit Si5351A for genarating the shared clock source with 5 potential inputs.
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PCM1802 ADC for L/R input Linear/HiFi audio capture.
Audio inputs and head switch input is on a dedicated bracket you can 3D print.
Clock Speed & Audio is controlled by a CLI application.
40msps 10-bit
DE0-Nano FPGA / FX3 USB 3.0 Board
- TI ADS825 ADC
- OPA690 OP-AMP
- Selectable 4 Position DIP gain control
Used for HiFi-Decode & RTL-SDR Decode.
Pictured Order: TNC Male to SMA Male / TNC Female to SMA Male / BNC Male to SMA Male / BNC Female to SMA Male / Nooelec RTL-SDR v5
Formerly called adc_usb3 / SMIRF - Simultaneous Multi Input RF Capture. - DD86 Discord
PCB: 20-30USD / Parts 100-120USD
Mainboard + FX3 USB 3.0 board
Features
- Off shelf FX3 USB 3.0 board (same as DdD)
- External Clock Source Output
- 6 Extra Aux inputs for audio ADC modules etc
- Duel ADC / Duel Input
- Physically adjustable input filters
- 12-Bit, 20/40/65msps sampling
- AD8138 Driver, Op-Amp / SN74ls541 Buffer / AD9235 ADC
LTC2208 ADC - 16-Bit, 130Msps
CYUSB3014
USB 3.0
Limited capture software support
Info / AliExpress (Global/MSRP) / Amazon UK / Amazon US
Limited Linux Support, developing slowly, working windows support more testing and testers required.
The original has been used by several members for testing but the clones that are under half the price.
8-bit 20msps ADC
There is two main physical versions, the physical multi input and the compact DIP switch configurable ones.
AliExpress Compact DIP With Shell
https://revspace.nl/Msi2500SDR
https://www.jotrin.com/product/parts/MSI001
Follow The Original Discussion On Discord
07.08.2023 Continued Discussion On Discord
Notes
The msi2500 is a variable bit (8 to 14 bit) ADC and DSP with USB interface. (See: msi2500-BlockDiagram.jpg)
The result is: a range from 10 kHz to 1 GHz (with a hole at 250-400 MHz) a bandwidth of up to 10 MHz,
MSPS from 2 to 6 MHz (14-bit) MSPS from 6 to 8 MHz (12-bit) MSPS from 8 to 9 MHz (10 bits) MSPS from 9 to 10 MHz (8 bits)
With a SNR of 60 dB.
One of the most early open-source ADCs eyed by the members of the decode projects during the early hifi days.
GitHub / CrowdSupply / Discord Server
PSO2020 Wiki / AliExpress
8-bit 30MSPS
Software;
sigrok-firmware-fx2lafw with librtlsdr modified for continuous write mode.
This can also apply to the 6022BE a duel input BNC ossilicope.
- FAQ - Frequently Asked Questions
- Diagram Breakdowns
- Visual-Comparisons
- VCR Reports / RF Tap Examples
- Download & Contribute Data
- Speed Testing
- Visual VBI Data Guide
- Closed Captioning
- Teletext
- WSS Wide - Screen Signalling
- VITC Timecode
- VITS Signals
- XDS Data (PBS)
- Video ID IEC 61880
- Vapoursynth TBC Median Stacking Guide
- Ruxpin-Decode & TV Teddy Tapes
- Tony's GNU Radio For Dummies Guide
- Tony's GNU Radio Scripts
- DomesDay Duplicator Utilities
- ld-decode Utilities