R-390A Receiver

R-390A Performance Test

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

-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.