My random junk repo for random things.

If you're looking for

NOTE FOR PULL REQUESTS: I DO NOT ACCEPT MASS ADDS. If you have 5-6 really awesome parts, I'll accept a pull request, but if you have say 10+ parts, I will not. Select only the neatest. Also, make sure JLCPCB offers the parts, if they're intended for board mounting!

• Discussion of ferrite cores and what their recommended power is
• Another doc like the above, but with different info
• Discussion of building ferrite cores
• Breakdown voltages of enameld copper wire
• Enameld wire datasheet

These are ones I've found that are JLCPCB compatible.

RF Stuff

• RDA5815 - 250 to 2300MHz - I/Q output - $3.18 ea? mentioned by RFS on my discord.
• MAX2120:
  • $3
  • Officially 925 to 2175MHz
  • Probably works down at around 860-930MHz Not Does not work for 2.4GHz
  • 1 SS I/Q Output
  • Fully integrated
  • Programmable bandwidth 4-40MHz
  • Analog Out
• RF2051TR13
  • $8
  • 30 to 2500MHz
  • 2SS Real Only
  • Analog Out
  • Fully integrated. Unknown bandwidth control.
• at86rf215:
  • $6
  • 389 to 2483 MHz, but spotty random parts (Supports 860-930 OR 2.4GHz)
  • 1 SS I/Q Output
  • Fully integated
  • ⚠️ May not be able to interface to CH32V305
  • 4MHz Bandwidth MAX
• R820T2:
  • $3
  • Supports 50M-1GHz
  • 30 - 1800MHz realistically.
  • IF output ONLY
  • Would require 20MSPS ADC.

Downconverter:

• LTC5567
  • 300 MHz to 4GHz
  • $6.197 $1
  • Downconverter only real only, output must be AC, 5 to 2500 MHz
  • No internal PLL
• ADL5801
  • 10 to 6000 MHz
  • $6.47 @ 100
  • Up/down converter (Real only, no oscallator)
• LT5560
  • 0.01 to 4000 MHz
  • $3.58 @ 100
  • Seems very basic and generic (Interesting) Looks like it can downconvert close to DC?
• AD8342
  • Low to 3800 MHz
  • $1.95 @ 100
  • Seems basic and generic.

IQ Demodulator

• LTC5586
  • $20 ($9.66 @ 1k)
  • 300 to 6000MHz
  • Includes PGA
  • Quadrature output with single fLO
• LTC5594
  • $40 ($19.39 @ 1k)
  • 500 to 9000MHz
  • Includes PGA
  • Quadrature output with single fLO
• ADL5380ACPZ-R7
  • 400 to 6000 MHz
  • $14 ($9@1k)
  • Looks very simple and clear.
  • Recommend broad spectrum balun TCM1-63AX+

Synthesizer:

• ADF4350
  • $4.87 @ 100
  • No quadrature output
  • 137.5 to 4400 MHz
• ADF4351
  • $12.98 @ 100
  • No quadrature output
  • 35 to 4400 MHz
• SI5351A
  • $0.55 @ 1000
  • 2.5kHz to 200MHz
  • 3 unique outputs
• ADF4106
  • $3.30 @ 1000
  • REQUIRES External PLL!
  • But dual-part, "Could" go up to 6GHz but needs to be paired with a VCO
• LMX2572
  • $10ish
  • 12.5MHz to 6.4GHz
  • Two outputs

FYI INMARSAT Aero is 3600 - 3629MHz

AS OF MAY 18, 2023

Title 99 still only applies a very small (if any) tarrif to this: Hand-Held Video Game Systems" - 9504.50.00

Title 99 (9903.88.01) applies a 25% tarrif to: Controller/Circuit Board for radio, communications or well, it seems most computing equiment: 8538.10.00, 8538.90.40, 8538.90.60 and 8538.90.81

Codes from JLCPCB:

• 8473.30 -> The board must be used in conjunction with a programmable machine (under HTS section 8471), in that it must meet the following requirements:

1. Storing the processing program or programs and at least the data immediately necessary for the execution of the program.
2. Being freely programmable in accordance with the requirements of the user.
3. Performing arithmetical computations specified by the user AND
4. Executing, without human intervention, a processing program which requires them to modify their exeuction, by logical decision during the processing run.

Also, another friend mentioned 8537.10.9170 is a common entry for general purpose circuit boards for controlling things. So may want to look into that if appropriate for your uses. Note: This has a 27% Tarriff at least in Oct, 2024