R-390A Performance Test

R-390A

EAC R-390A

Band MDS Blocking Two-tone D.R.
(20 kHz) (20 kHz)
 
80 meters -140 dBm 124 dB 81 dB
40 meters -141 dBm 123 dB 87 dB
20 meters -141 dBm 122 dB 89 dB

AM Audio S/N: 44 dB




AM Audio Frequency Response:

 
100 Hz 200 Hz 400 Hz 600 Hz 800 Hz 1 kHz 2 kHz 3 kHz 4 kHz 5 kHz 6 kHz
 
-3 dB -1 dB 0 dB 0 dB 0 dB 0 dB 0 dB 0 dB 0 dB -2 dB -5 dB

AM Audio Distortion:

 
Mod% 100 Hz 200 Hz 400 Hz 600 Hz 800 Hz 1 kHz 2 kHz
 
30% 2.8% 2.0% 2.0% 2.0% 2.0% 1.8% 1.8%
50% 2.5% 1.4% 1.3% 1.3% 1.3% 1.3% 1.2%
70% 3.2% 1.6% 1.2% 1.2% 1.2% 1.2% 1.2%
90% 4.5% 2.0% 1.3% 1.3% 1.3% 1.3% 1.4%
100% 6.3% 4.0% 3.2% 3.2% 3.2% 3.5% 2.8%

Notes: Maximum i-f bandwidth is about 16 kHz @ -6 dB.

AM distortion numbers show the somewhat typical increase at lower audio frequencies - most often caused by the low audio frequencies riding on the AGC line. Also there is the usual increase in audio distortion as the modulation percentage increases. This is due to the detector's inability to cleanly demodulate the higher amplitude levels.