Difference between pages "File:RTL-SDR improvements v3new800x800.jpg" and "WA3TFS SDR Upverter Design"

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[[file:WA3TFS_Upverter_P1874-720px.jpg]]
  
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== Features ==
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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.
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* $55
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** Purchased at [https://www.facebook.com/w3pie W3PIE] hamfest
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** [https://044640f.netsolhost.com/ Can be ordered as PCB, Kit, or assembled]
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* [https://www.minicircuits.com/pdfs/SBL-1+.pdf SBL-1 Level 7 mixer]
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* 100 MHz can oscillator
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* Low pass filter
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** 35 MHz
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* [https://044640f.netsolhost.com/ 1 kHz to 1.7 GHz SDR Receiver] - WA3TFS Design
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** [https://rest.edit.site/filestorage-api-service/23f1203e3bd4a6128459f208dcf16362/forkiin-sdr-qst-article.pdf?dl=1 QST Article]
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** [https://static-cdn.edit.site/users-files/73eecae7c71adfad0f97a69e16be7203/sdr-wiring-diagram(3).pdf?dl=1 SDR wiring diagram]
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** [https://static-cdn.edit.site/users-files/e5b0fbd1d917fc766cf2197693d69209/bill-of-material-sdr-rev-1-3.pdf?dl=1 Parts List]
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** [https://static-cdn.edit.site/users-files/21f2eeabc8074f4bc64a7b350b8b52e1/pcb_r11.jpg?dl=1 Layout]
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=== Schematic ===
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[[file:WA3TFS_Upverter_Schematic.PNG]]
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=== Pass Filter ===
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* 9 turns on FT37-2 = 0.3 uH
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[[file:WA3TFS_Upverter_Inductor.PNG]]
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* LTSpice Simulation
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** 1-100 MHz
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[[file:WA3TFS_Upverter_Pass_Filter.PNG]]
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* LTSpice Simulation
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** 1MHz-1GHz
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[[file:WA3TFS_Upverter_Pass_Filter_1MHz-to-1GHz.PNG]]
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== Software ==
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* [https://www.rtl-sdr.com/ RTL-SDR]
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* [http://hdsdr.de/ HDSDR] - Easier to use
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* [https://airspy.com/download/ SDR Sharp] - Crashier
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== Build ==
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* Nice silver mica caps for the band pass filter
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** My kit was missing the center cap of the band pass filter (150 pF)
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** I used a junk box ceramic disc cap
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* 30pF cap installed in J_A to J_B marked 300
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* Build was too tough due to very small pads on the PCB
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** Particularly tough to solder ground pads
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** Pad shapes were not round so less area to set soldering iron
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* Is LO drive more than 7 dBm?
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* Pin 1 orientations on the mixer and oscillator "backwards" from other board legends
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** Pin 1 shown in red circle
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[[file:WA3TFS_Upverter_pcb_r11.jpg]]
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=== RTL-SDR ===
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* [https://www.rtl-sdr.com/buy-rtl-sdr-dvb-t-dongles/ RTL-SDR DONGLES (RTL2832U)]
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* Has SMA connector
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[[file:RTL-SDR_improvements_v3new800x800.jpg]]
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=== Wiring ===
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* SPDT switch
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** One switch pole powers the card (turns off 12V)
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** Other switch pole switched in/out the Upverter
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** Could just move the cable
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[[file:WA3TFS_Upverter_Wiring.PNG]]
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== Enclosure ==
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* Board fits perfectly in
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** [https://www.adafruit.com/product/2230 Extruded Aluminum Enclosure Box - 94mm x 83mm x 30mm]
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** Card just perfectly matches
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[[file:WA3TFS_Upverter_P1878-720px.jpg]]
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[[file:WA3TFS_Upverter_P1880-720px.jpg]]
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== Videos by others ==
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<video type="youtube">XeQnDpzhcRo</video>

Revision as of 16:19, 14 October 2021

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.

Schematic

WA3TFS Upverter Schematic.PNG

Pass Filter

  • 9 turns on FT37-2 = 0.3 uH

WA3TFS Upverter Inductor.PNG

  • LTSpice Simulation
    • 1-100 MHz

WA3TFS Upverter Pass Filter.PNG

  • LTSpice Simulation
    • 1MHz-1GHz

WA3TFS Upverter Pass Filter 1MHz-to-1GHz.PNG

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

WA3TFS Upverter pcb r11.jpg

RTL-SDR

RTL-SDR improvements v3new800x800.jpg

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

WA3TFS Upverter Wiring.PNG

Enclosure

WA3TFS Upverter P1878-720px.jpg

WA3TFS Upverter P1880-720px.jpg

Videos by others

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