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 amplifyers.
- Software Defined Crystal Rate
- Hardware Syncroniced Muli-Card Capture
- Hardware Synchronised Linear/Baseband Audio Capture
The most advanced mod avalible today, using an external cystal 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 outher 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 synbcroised Linear/Refrance 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 Headswitch 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 Positon DIP gain control
Prototype duel ADC - Diginged by Stefan_O - DD86 Discord
Possible Future & Internal Name: SMIRF - Simultaneous Multi Input RF Capture.
Cost: 150 Euro +- 25 Euro - JLCPCB/PCBway direct fabrication
PCB: 20-30USD / Parts 50-70USD
Features
- Offshelf FX3 USB 3.0 board (same as DdD)
- External Clock Source Output
- 6 Extra Aux inputs for audio ADC modules etc
- Duel ADC / Duel Imput
- 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-sorce ADCs eyed by the members of the decode projects during the early hifi days.
GitHub / CrowdSupply / Discord Server
- 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