Difference between revisions of "WA3TFS SDR Upverter Design"
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== Features == | == Features == | ||
| − | SDR up-converter/receiver shifts | + | 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 at [https://www.facebook.com/w3pie W3PIE] hamfest | + | * $55 |
| + | ** Purchased at [https://www.facebook.com/w3pie W3PIE] hamfest | ||
** [https://044640f.netsolhost.com/ Can be ordered as PCB, Kit, or assembled] | ** [https://044640f.netsolhost.com/ Can be ordered as PCB, Kit, or assembled] | ||
| − | * SBL-1 mixer | + | * [https://www.minicircuits.com/pdfs/SBL-1+.pdf SBL-1 Level 7 mixer] |
* 100 MHz can oscillator | * 100 MHz can oscillator | ||
* Low pass filter | * Low pass filter | ||
| + | ** 35 MHz | ||
* [https://044640f.netsolhost.com/ 1 kHz to 1.7 GHz SDR Receiver] - WA3TFS Design | * [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://rest.edit.site/filestorage-api-service/23f1203e3bd4a6128459f208dcf16362/forkiin-sdr-qst-article.pdf?dl=1 QST Article] | ||
| Line 27: | Line 29: | ||
* LTSpice Simulation | * LTSpice Simulation | ||
| + | ** 1-100 MHz | ||
[[file:WA3TFS_Upverter_Pass_Filter.PNG]] | [[file:WA3TFS_Upverter_Pass_Filter.PNG]] | ||
| + | |||
| + | * LTSpice Simulation | ||
| + | ** 1MHz-1GHz | ||
| + | |||
| + | [[file:WA3TFS_Upverter_Pass_Filter_1MHz-to-1GHz.PNG]] | ||
== Software == | == Software == | ||
| Line 38: | Line 46: | ||
== Build == | == Build == | ||
| − | * Nice silver mica caps | + | * Nice silver mica caps for the band pass filter |
| − | ** My kit was missing the center cap of the band filter (150 pF) | + | ** 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 | * 30pF cap installed in J_A to J_B marked 300 | ||
| − | * Build was tough due to very small pads on the PCB | + | * Build was too tough due to very small pads on the PCB |
** Particularly tough to solder ground pads | ** Particularly tough to solder ground pads | ||
** Pad shapes were not round so less area to set soldering iron | ** Pad shapes were not round so less area to set soldering iron | ||
* Is LO drive more than 7 dBm? | * Is LO drive more than 7 dBm? | ||
* Pin 1 orientations on the mixer and oscillator "backwards" from other board legends | * Pin 1 orientations on the mixer and oscillator "backwards" from other board legends | ||
| − | ** Pin 1 shown in red | + | ** Pin 1 shown in red circle |
| + | |||
[[file:WA3TFS_Upverter_pcb_r11.jpg]] | [[file:WA3TFS_Upverter_pcb_r11.jpg]] | ||
=== Wiring === | === 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]] | [[file:WA3TFS_Upverter_Wiring.PNG]] | ||
Revision as of 15:06, 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
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
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