RCA CR-88 Performance Test

RCA CR-88

RCA CR-88

Band MDS Blocking Two-tone D.R.
(20 kHz) (20 kHz)
 
80 meters -140 dBm 102 dB 77 dB
40 meters -139 dBm 105 dB 78 dB
20 meters -137 dBm 102 dB 78 dB

AM Audio S/N: 48 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
 
-4 dB -2 dB 0 dB 0 dB 0 dB 0 dB 0 dB 0 dB 0 dB -2 dB -8 dB

AM Audio Distortion:

 
Mod% 100 Hz 200 Hz 400 Hz 600 Hz 800 Hz 1 kHz 2 kHz
 
30% 6.3% 5.0% 4.0% 3.5% 3.2% 3.2% 4.0%
50% 5.6% 3.5% 2.8% 3.2% 3.2% 3.2% 5.6%
70% 5.0% 2.5% 2.5% 3.2% 3.5% 3.5% 7.1%
90% 6.3% 3.2% 3.2% 3.5% 4.0% 4.5% 10%
100% 8.9% 4.0% 4.0% 4.0% 4.0% 5.0% 11%

Notes:

MDS, blocking and two-tone DR measurements performed using the narrowest crystal filter setting. AM audio recovery tests performed using the widest bandwidth setting - about 12 kHz @ 6 dB down. 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.

Thanks to W1MPY for use of this receiver.