Manufacturing feasibility assessment
5. Verdict
Viable at $800–1,500, but define frequency bands, add switched filtering/thermal protection, and regional EMC compliance; start with a 50-unit engineering pilot.
6. Subsystems
- 6.1 SDR RF and digital basebandMEDIUM
- 6.2 20 W linear power amplifierHIGH
- 6.3 Transmit filtering and antenna protectionHIGH
- 6.4 Thermal and mechanical designMEDIUM
- 6.5 USB, firmware and PC softwareMEDIUM
- 6.6 Production RF calibration and testHIGH
7. Bill of materials
| Item | 100 | 1,000 | 10,000 |
|---|---|---|---|
| 7.1 RF transceiver, converters, clocks and FPGA/SoC | US$85-110 | US$55-70 | US$40-50 |
| 7.2 20 W linear PA, driver and bias control | US$100-130 | US$65-85 | US$45-60 |
| 7.3 Band-pass/low-pass filters, T/R switch and RF protection | US$65-85 | US$40-55 | US$25-35 |
| 7.4 Aluminum heatsink enclosure, connectors and hardware | US$60-80 | US$42-55 | US$30-40 |
| 7.5 USB/control PCB, display and user controls | US$28-38 | US$18-25 | US$13-18 |
| 7.6 External 13.8 V power supply and cable set | US$38-52 | US$28-38 | US$20-28 |
| 7.7 Assembly, RF calibration and final functional test | US$42-58 | US$25-35 | US$16-24 |
| 7.8 Packaging, manuals and accessories | US$12-18 | US$8-12 | US$6-9 |
At 10k units, tooling amortises to roughly US$45-75 per unit. Estimated 10k BOM is US$195-264, or about 24-33% of the US$800 entry retail; this works only with a 10k-scale run and external PSU.
8. Gates to clear
8.1 [DFM]
A general-coverage 20 W transmitter is not the buildable version; PA, filters, thermal design and test coverage expand sharply with unrestricted bands.
Path: Define an amateur-band-only HF/6 m SKU (for example 1.8-54 MHz), use switched low-pass filter banks, an LDMOS PA reference design, and an RF contract manufacturer with automated harmonic/IMD test.
8.2 [Certification]
There is no single global approval. Open transmit coverage and an internal mains PSU create avoidable regional radio, EMC and safety exposure.
Path: Ship region-configured band-plan firmware, use an external IEC 62368-1 certified PSU, test US digital emissions under FCC Part 15B and operating constraints under Part 97, then CE under RED 2014/53/EU with EN 301 783/EN 301 489 and UKCA; add ISED testing for Canada.
8.3 [Tooling]
RF calibration fixtures, heatsink tooling and compliance work are uneconomic at a 100-unit launch, and low-volume BOM exceeds a comfortable retail margin.
Path: Build EVT units in CNC or formed aluminum, run a 100-unit pilot with manual calibration, validate a 1k preproduction lot, then release extrusion/die tooling and automated RF test only against a 10k-unit forecast.
9. Prototype sequence
- 9.1Freeze the required change: amateur-band-only HF/6 m transmit coverage, external PSU, and a continuous-duty derating specification.This bounds PA, filter, thermal and approval scope before schematic and enclosure decisions are locked.
- 9.2Build separate SDR receiver/exciter and 20 W PA/filter evaluation boards using a proven LDMOS reference design.This de-risks IMD, harmonics, gain flatness and thermal behavior before committing to an integrated PCB.
- 9.3Produce 10-20 EVT desktop units with aluminum heatsinks, protection firmware and PC drivers.This validates USB stability, RF immunity, tuning repeatability, fan/noise behavior and operator workflow.
- 9.4Run pre-compliance FCC Part 15B, RED EMC and conducted/radiated harmonic testing on region-configured firmware.Early lab results identify filter, shielding and grounding changes before enclosure tooling and formal certification.
- 9.5Build a 100-unit pilot with automated RF calibration and production end-of-line test limits.This establishes yield, test time, thermal margin and actual BOM before committing the 1k and 10k manufacturing path.
Assessment criteria: J. Tanikella · Engine: GPT-5.6 Terra.
