BC-348 Receiver

BC-348R Performance Test

Belmont BC-348R


Band	MDS	Blocking	Two-tone D.R.
		(20 kHz)	(20 kHz)

80 meters	-137 dBm	106 dB	87 dB
40 meters	-137 dBm	105 dB	86 dB
20 meters	-134 dBm	101 dB	84 dB

AM Audio S/N: 40 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

-6 dB

0 dB

+1 dB

0 dB

-1 dB

-3 dB

-8 dB

-12 dB

-17 dB

AM Audio Distortion:



Mod%	100 Hz	200 Hz	400 Hz	600 Hz	800 Hz	1 kHz	2 kHz

30%	28%	14%	3.5%	3.2%	4.0%	4.5%	4.0%
50%	35%	14%	3.2%	3.2%	4.0%	4.5%	5.6%
70%	35%	14%	3.5%	3.5%	4.5%	5.6%	10%
90%	35%	14%	4.5%	5.0%	7.1%	10%	16%
100%	35%	14%	6.3%	7.1%	10%	13%	18%

Notes: 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.