Difference between pages "File:RTL-SDR Q-branch.png" and "WA3TFS SDR Upverter Design"
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+ | [[file:WA3TFS_Upverter_P1874-720px.jpg]] | ||
+ | == Features == | ||
+ | |||
+ | SDR up-converter/receiver shifts HF (0-30 MHz) frequencies up by 100 MHz. Used to listen to HF frequencies on an inexpensive RTL-SDR module. | ||
+ | |||
+ | * $55 | ||
+ | ** Purchased at [https://www.facebook.com/w3pie W3PIE] hamfest | ||
+ | ** [https://044640f.netsolhost.com/ Can be ordered as PCB, Kit, or assembled] | ||
+ | * [https://www.minicircuits.com/pdfs/SBL-1+.pdf SBL-1 Level 7 mixer] | ||
+ | * 100 MHz can oscillator | ||
+ | * Low pass filter | ||
+ | ** 35 MHz | ||
+ | * [https://044640f.netsolhost.com/ 1 kHz to 1.7 GHz SDR Receiver] - WA3TFS Design | ||
+ | ** [https://rest.edit.site/filestorage-api-service/23f1203e3bd4a6128459f208dcf16362/forkiin-sdr-qst-article.pdf?dl=1 QST Article] | ||
+ | ** [https://static-cdn.edit.site/users-files/73eecae7c71adfad0f97a69e16be7203/sdr-wiring-diagram(3).pdf?dl=1 SDR wiring diagram] | ||
+ | ** [https://static-cdn.edit.site/users-files/e5b0fbd1d917fc766cf2197693d69209/bill-of-material-sdr-rev-1-3.pdf?dl=1 Parts List] | ||
+ | ** [https://static-cdn.edit.site/users-files/21f2eeabc8074f4bc64a7b350b8b52e1/pcb_r11.jpg?dl=1 Layout] | ||
+ | |||
+ | === Schematic === | ||
+ | |||
+ | [[file:WA3TFS_Upverter_Schematic.PNG]] | ||
+ | |||
+ | === Pass Filter === | ||
+ | |||
+ | * 9 turns on FT37-2 = 0.3 uH | ||
+ | |||
+ | [[file:WA3TFS_Upverter_Inductor.PNG]] | ||
+ | |||
+ | * LTSpice Simulation | ||
+ | ** 1-100 MHz | ||
+ | |||
+ | [[file:WA3TFS_Upverter_Pass_Filter.PNG]] | ||
+ | |||
+ | * LTSpice Simulation | ||
+ | ** 1MHz-1GHz | ||
+ | |||
+ | [[file:WA3TFS_Upverter_Pass_Filter_1MHz-to-1GHz.PNG]] | ||
+ | |||
+ | == Software == | ||
+ | |||
+ | * [https://www.rtl-sdr.com/ RTL-SDR] | ||
+ | * [http://hdsdr.de/ HDSDR] - Easier to use | ||
+ | * [https://airspy.com/download/ SDR Sharp] - Crashier | ||
+ | |||
+ | == Build == | ||
+ | |||
+ | * Nice silver mica caps for the band pass filter | ||
+ | ** My kit was missing the center cap of the band pass filter (150 pF) | ||
+ | ** I used a junk box ceramic disc cap | ||
+ | * 30pF cap installed in J_A to J_B marked 300 | ||
+ | * Build was too tough due to very small pads on the PCB | ||
+ | ** Particularly tough to solder ground pads | ||
+ | ** Pad shapes were not round so less area to set soldering iron | ||
+ | * Is LO drive more than 7 dBm? | ||
+ | * Pin 1 orientations on the mixer and oscillator "backwards" from other board legends | ||
+ | ** Pin 1 shown in red circle | ||
+ | |||
+ | [[file:WA3TFS_Upverter_pcb_r11.jpg]] | ||
+ | |||
+ | === RTL-SDR === | ||
+ | |||
+ | * [https://www.rtl-sdr.com/buy-rtl-sdr-dvb-t-dongles/ RTL-SDR DONGLES (RTL2832U)] - rtl-sdr.com site | ||
+ | ** [https://www.rtl-sdr.com/rtl-sdr-quick-start-guide/ RTL-SDR Quick Start Guide] | ||
+ | * <1 PPM temperature compensated oscillator (TCXO) | ||
+ | ** Accurate tuning and almost zero temperature drift (2 PPM max. initial offset, 0.5-1 PPM temperature drift) | ||
+ | ** SMA female antenna port | ||
+ | ** Generic dongles use the less common MCX or PAL antenna ports | ||
+ | ** SMA is more common, so more adapters and antennas are available for it | ||
+ | ** It is also more durable and has lower RF insertion losses | ||
+ | * 4.5V USB powered bias tee | ||
+ | ** This allows the RTL-SDR to power low noise amplifiers (like the LNA4ALL, HABAMP, RTL-SDR Blog ADS-B LNA) and active antennas through the coax cable | ||
+ | ** Can be enabled in software (see V3 users guide). | ||
+ | * Aluminium case and passive cooling | ||
+ | ** These units come stock with an aluminum case and passive cooling via a silicon thermal pad | ||
+ | ** This stops reception failing due to heat when used above ~1.2 GHz | ||
+ | * Improved Antennas | ||
+ | ** We provide an excellent dipole antenna starter kit for newbies | ||
+ | ** Use the included mounts and extension cable to mount the dipole in good position for optimal reception | ||
+ | ** Receives terrestrial and VHF satellite signals | ||
+ | * Various additional improvements compared to other RTL-SDRs | ||
+ | ** R820T2 tuner, higher quality passive components, a choke on the USB line to reduce USB noise, a much improved PCB design for significantly less internal spurs and noise, various break-out pads, improved ESD protection, additional bypass capacitors and ferrite power line chokes, improved front end matching circuit, a modified power design for improved long term reliability, and a better LDO. | ||
+ | |||
+ | [[file:RTL-SDR_improvements_v3new800x800.jpg]] | ||
+ | |||
+ | ==== RTL-SDR V3 - HF Direct Sampling Mode ==== | ||
+ | |||
+ | * RTL-SDR V3 can listen to 500 kHz - 28.8 MHz with direct sampling | ||
+ | ** [https://www.rtl-sdr.com/rtl-sdr-blog-v-3-dongles-user-guide/ Direct Sampling HF Mode] | ||
+ | * Simply connect an HF antenna to the SMA port, and choose the Q-branch mode | ||
+ | * There is a built in 25 MHz low pass filter, but additional HF filters may be required for optimal performance (e.g. to attenuate strong MW AM) | ||
+ | |||
+ | [[file:RTL-SDR_Q-branch.png]] | ||
+ | |||
+ | * Short video showing this | ||
+ | |||
+ | <video type="youtube">I6Kh9A1Nd_s</video> | ||
+ | |||
+ | === Wiring === | ||
+ | |||
+ | * SPDT switch | ||
+ | ** One switch pole powers the card (turns off 12V) | ||
+ | ** Other switch pole switched in/out the Upverter | ||
+ | ** Could just move the cable | ||
+ | |||
+ | [[file:WA3TFS_Upverter_Wiring.PNG]] | ||
+ | |||
+ | == Enclosure == | ||
+ | |||
+ | * Board fits perfectly in | ||
+ | ** [https://www.adafruit.com/product/2230 Extruded Aluminum Enclosure Box - 94mm x 83mm x 30mm] | ||
+ | ** Card just perfectly matches | ||
+ | |||
+ | [[file:WA3TFS_Upverter_P1878-720px.jpg]] | ||
+ | |||
+ | [[file:WA3TFS_Upverter_P1880-720px.jpg]] | ||
+ | |||
+ | == Videos by others == | ||
+ | |||
+ | <video type="youtube">I6Kh9A1Nd_s</video> | ||
+ | |||
+ | <video type="youtube">XeQnDpzhcRo</video> |
Revision as of 16:39, 14 October 2021
Contents
Features
SDR up-converter/receiver shifts HF (0-30 MHz) frequencies up by 100 MHz. Used to listen to HF frequencies on an inexpensive RTL-SDR module.
- $55
- Purchased at W3PIE hamfest
- Can be ordered as PCB, Kit, or assembled
- SBL-1 Level 7 mixer
- 100 MHz can oscillator
- Low pass filter
- 35 MHz
- 1 kHz to 1.7 GHz SDR Receiver - WA3TFS Design
Schematic
Pass Filter
- 9 turns on FT37-2 = 0.3 uH
- LTSpice Simulation
- 1-100 MHz
- LTSpice Simulation
- 1MHz-1GHz
Software
Build
- Nice silver mica caps for the band pass filter
- My kit was missing the center cap of the band pass filter (150 pF)
- I used a junk box ceramic disc cap
- 30pF cap installed in J_A to J_B marked 300
- Build was too tough due to very small pads on the PCB
- Particularly tough to solder ground pads
- Pad shapes were not round so less area to set soldering iron
- Is LO drive more than 7 dBm?
- Pin 1 orientations on the mixer and oscillator "backwards" from other board legends
- Pin 1 shown in red circle
RTL-SDR
- RTL-SDR DONGLES (RTL2832U) - rtl-sdr.com site
- <1 PPM temperature compensated oscillator (TCXO)
- Accurate tuning and almost zero temperature drift (2 PPM max. initial offset, 0.5-1 PPM temperature drift)
- SMA female antenna port
- Generic dongles use the less common MCX or PAL antenna ports
- SMA is more common, so more adapters and antennas are available for it
- It is also more durable and has lower RF insertion losses
- 4.5V USB powered bias tee
- This allows the RTL-SDR to power low noise amplifiers (like the LNA4ALL, HABAMP, RTL-SDR Blog ADS-B LNA) and active antennas through the coax cable
- Can be enabled in software (see V3 users guide).
- Aluminium case and passive cooling
- These units come stock with an aluminum case and passive cooling via a silicon thermal pad
- This stops reception failing due to heat when used above ~1.2 GHz
- Improved Antennas
- We provide an excellent dipole antenna starter kit for newbies
- Use the included mounts and extension cable to mount the dipole in good position for optimal reception
- Receives terrestrial and VHF satellite signals
- Various additional improvements compared to other RTL-SDRs
- R820T2 tuner, higher quality passive components, a choke on the USB line to reduce USB noise, a much improved PCB design for significantly less internal spurs and noise, various break-out pads, improved ESD protection, additional bypass capacitors and ferrite power line chokes, improved front end matching circuit, a modified power design for improved long term reliability, and a better LDO.
RTL-SDR V3 - HF Direct Sampling Mode
- RTL-SDR V3 can listen to 500 kHz - 28.8 MHz with direct sampling
- Simply connect an HF antenna to the SMA port, and choose the Q-branch mode
- There is a built in 25 MHz low pass filter, but additional HF filters may be required for optimal performance (e.g. to attenuate strong MW AM)
- Short video showing this
Wiring
- SPDT switch
- One switch pole powers the card (turns off 12V)
- Other switch pole switched in/out the Upverter
- Could just move the cable
Enclosure
- Board fits perfectly in
- Extruded Aluminum Enclosure Box - 94mm x 83mm x 30mm
- Card just perfectly matches
Videos by others
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