Difference between revisions of "0/10/20/30 dB Attenuator"
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* Lots of ground stitching | * Lots of ground stitching | ||
* Compared to Homebrew attenuator | * Compared to Homebrew attenuator | ||
| − | ** Homebrew is more accurate | + | ** Homebrew is more accurate in DC-100 MHz range |
[[file:ATTEN_30DB(HOMEBREWvsPURCHASED)_1MHz_TO_900MHz.png]] | [[file:ATTEN_30DB(HOMEBREWvsPURCHASED)_1MHz_TO_900MHz.png]] | ||
Revision as of 16:35, 3 October 2021
Contents
Specs
DC-4.0GHz 200mW DC 4.0GHz RF Fixed Attenuator SMA Double Female Head 0dB 10dB 20dB 30dB
- From the AliExpress listing
- $5 with shipping (2021-10)
- Frequency range: DC - 4.0GHz
- Maximum power: 23dBm (200mW)
- Standing wave ratio: ≤ 1.20
- System impedance: 50Ω
- RF interface: SMA double female head (Outer screw inner hole)
- Attenuation:
- Direct: 0dB (reference)
- Level 1: 10 ± 0.8 dB
- Level 2: 20 ± 1.1 dB
- Level 3: 30 ± 1.5dB
Measurements
- Characterized filters uinf NanoVNA
- 1 to 900 MHz (card spec is up to 4 GHz)
- Through-calibrated with SMA barrel and same cables was flat
0 dB
10 dB
20 dB
30 dB
Calibrating NanoVNA through the card
- Calibrate on card 0 dB (pass-through connections)
0 dB
10 dB
20 dB
30 dB
Analysis of Results
- Board uses 5% (3-digits) resistors
- Can result be 1dB with 5% resistors?
- Tracks are wide but 50 Ohms?
- 0805 resistors limit power handling to 200 mW max
- Lots of ground stitching
- Compared to Homebrew attenuator
- Homebrew is more accurate in DC-100 MHz range
_1MHz_TO_900MHz.png)
