AOR AR7030 - Sensitivity; Selectivity

AR7030 OPERATING MANUAL PAGE 35
11. Selectivity
The following data is taken from measured performance of the 455kHz I F system and ignores effects of the
45MHz roofing filter and any audio frequency response tailoring. AGC was switched off.
Filter stop-band attenuation : All filters > 110dB
2.2kHz filter characteristics : -6dB bandwidth : 2.29kHz
-60dB bandwidth : 3.34kHz
-80dB bandwidth : 4.98kHz
6/60 shape factor : 1 : 1.46
5.5kHz filter characteristics : -6dB bandwidth : 5.54kHz
-60dB bandwidth : 9.11kHz
-90dB bandwidth : 10.75kHz
6/60 shape factor : 1 : 1.64
7kHz filter characteristics : -6dB bandwidth : 6.90kHz
-60dB bandwidth : 11.60kHz
-90dB bandwidth : 13.36kHz
6/60 shape factor : 1 : 1.68
12. Dynamic range
Reciprocal mixing effects : Quoted figure is unwanted signal strength, relative to noise floor, that decreases
wanted signal S+N/N ratio by 3dB.
Tested at 12.75MHz in USB mode with 2.2kHz filter. Wanted and unwanted signals both unmodulated.
Noise floor : -123dBm
Signal separation Signal rejection Local osc SSB phase noise
5kHz 90dB -123dBc/Hz
10kHz 99dB -132dBc/Hz
20kHz 109dB -142dBc/Hz
50kHz 119dB -152dBc/Hz
100kHz > 125dB < -158dBc/Hz
Blocking effects : Quoted figure is unwanted signal strength that reduces wanted signal level by 1dB
(with no AGC action). Tested in USB mode with R F pre-amp switched off.
Wanted signal at 20MHz, unwanted signal at 10.7MHz, both unmodulated.
Blocking signal strength : +14dBm (1.12V) Blocking dynamic range : 137dB
Intermodulation effects : Quoted dynamic range figure is the difference between the receiver nose floor and
the level of two equal unwanted signals required to produce an intermodulation
product at the noise floor level. The IFDR figure here is calculated from measuring
the intermodulation level produced by two signals at 0dBm, and verified by
re-calculation at -5dBm.
Tested at around 12.7MHz in USB mode with 2.2kHz filter and R F pre-amp switched off.
Noise floor : -123dBm
Signal separation Intermodulation-free dynamic range 3rd order intercept point (IP
3
)
5 / 10kHz 92dB +15dBm
10 / 20kHz 100dB +27dBm
20 / 40kHz 104dB +32dBm
50 / 100kHz 104dB +33dBm
100 / 200kHz 105dB +34.5dBm
Switching in the R F pre-amp reduces IP
3
by about 10dB, and IFDR by about 2dB.