|
|
| Line 1: |
Line 1: |
| − | [[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 ===
| |
| − |
| |
| − | * Has SMA connector
| |
| − |
| |
| − | [[file: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
| |
| − |
| |
| − | [[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">XeQnDpzhcRo</video>
| |
