Measurement of Performance

MDS (Minimum Detectable Signal)

MDS @ 10MHz = -127dBm

MDS is the lowest power level of a signal that a radio receiver can detect with a specified signal-to-noise ratio (SNR). It indicates the receiver's ability to pick up weak signals.

MDS is typically measured in decibels relative to one milliwatt (dBm) across a specific impedance (usually 50 ohms).

A lower MDS value means the receiver is more sensitive and can detect weaker signals, which is crucial for applications requiring long-range communication or operating in environments with low signal strength.

Measure Configuration

AGC Manual, Gain 100dB, Mode=CW, Bandwidth=500Hz

Measure Noise Floor

Att is tuned to max and the spectrum reads at -144dBm. REW application can read the audio signal level at 77.5dB.

measure_noise.png

Measure +3dB

Reduce Att until REW application reads 80.5dB. The ATT reads at -127dBm.

measure_3db.png

Analog Filters in front of ADC

HF LPF filter

HF LPF

• Marker 1 is 60.0700MHz
• Marker 2 is 10.0950MHz
• Marker 3 is 94.0530MHz

VHF/Airband BPF filter

VHF BPF

• Marker 1 is 129.0000MHz
• Marker 2 is 115.0000MHz
• Marker 3 is 150.0000MHz