Drake 2-B Receiver

Drake 2-B Receiver Performance Test

Drake 2-B


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

80 meters	-139 dBm	117 dB	83 dB
40 meters	-140 dBm	118 dB	84 dB
20 meters	-138 dBm	118 dB	87 dB

AM Audio S/N: 33 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

-16 dB

-3 dB

0 dB

-5 dB

-30 dB

-36 dB

-42 dB

AM Audio Distortion:



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

30%	63%	16%	5.6%	4.0%	3.5%	3.2%	4.5%
50%	71%	13%	5.0%	8.9%	11%	10%	5.0%
70%	56%	14%	13%	16%	18%	14%	5.0%
90%	63%	22%	18%	20%	20%	18%	5.0%
100%	63%	25%	20%	22%	22%	18%	5.0%

Notes: AM frequency response was fairly restricted due to the 3.6 kHz maximum i-f bandwidth. 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.

Did not have a chance to investigate why the distortion numbers were significantly worse than the Drake 2-A.