Spectrum Measurements
RF Output Measurements:
a) Spectrum Harmonics:
|
Frequency MHz |
2nd Harmonic dBc |
3rd Harmonic dBc |
|
1.9 |
-70 |
-81 |
|
3.6 |
-60 |
-73 |
|
5.4 |
-67 |
-86 |
|
7.15 |
-64 |
-82 |
|
10.15 |
-64 |
-72 |
|
14.15 |
-58 |
-70 |
|
18.15 |
-66 |
-80 |
|
21.2 |
-73 |
-80 |
|
24.9 |
-62 |
-68 |
|
29.7 |
-60 |
-60 |
|
50.5 |
-77 |
-63 |
|
70.5 |
-59 |
-70 |
b) Carrier Suppression:
|
Frequency |
Suppression dBc |
|
1.8 to 30 MHz |
-80 |
|
50 to 72 MHz |
-70 |
c) Inter Modulation Distortion (IMD):
Two Tone Test result = - 40 to - 47 dBc. Measured at +37 dBm Output
( Measured using HDSDR Two Tone Generator and a 10 KHz Offset).
See Photo below (e).
d) RX Local Oscillator Power, Feed through to Antenna:
|
Frequency MHz |
LO Pwr. at Antenna (dBm) |
LNA selected |
|
1.8 |
-80 |
- |
|
3.5 |
-83 |
- |
|
5.398 |
-80 |
- |
|
7.15 |
-82.5 |
- |
|
10.15 |
-87 |
- |
|
14.15 |
-90 |
- |
|
18.15 |
-85 |
-110 |
|
21.15 |
-78 |
-106 |
|
24.95 |
-77 |
-99.5 |
|
28.5 |
-74.7 |
-97.4 |
|
50.5 |
-67 |
-84.4 |
|
70.5 |
-64.2 |
-84.9 |
|
72.5 |
-66 |
-99.6 |
|
144 |
-110 |
- |
|
432 |
-102.2 |
- |
|
1296 |
-96.6 |
- |
e) Power Amplifier RF Output, two-tone high linearity performance ( IMD -47.84 dBc) :
TX RF Output Power
Freq MHz Power O/P dBm PEP Watts
1.8 + 43.83 34.14
3.7 + 43.14 29.14
5.4 + 44.3 38.06
7.15 + 44.1 36.33
10.15 + 44.5 39.84
14.15 + 44.15 36.76
18.15 + 44.0 35.51
21.15 + 43.83 34.15
24.9 + 43.32 30.37
28.5 + 42.8 26.9
50.5 + 43.9 34.7
70.5 + 44.2 37.18
'S' Meter and RX Attenuator Accuracy versus Frequency
Tested at an RX input power of -73.0 dBm (S 9)
Freq. MHz S Meter dBm Atten -10dB -20dB -30dB
1.8 -74.8 -84.8 -94.4 -104.4
3.6 -73.1 -82.9 -92.7 -102.7
5.4 -73.1 -83.0 -92.7 -102.7
7.15 -73.1 -83.2 -93.0 -103.0
10.15 -72.4 -82.7 -92.7 -102.5
14.15 -73.0 -82.9 -93.0 -102.9
18.15 -73.0 -83.5 -93.4 -103.2
21.15 -73.6 -83.9 -93.8 -104.3
24.9 -74.1 -84.4 -94.4 -104.3
28.5 -74.8 -85.6 -95.3 -105.2
50.5 -72.6 -83.1 -93.4 -103.0
70.5 -73.7 -83.2 -92.9 -103.2
Receiver Sensitivity:
Minimum Detectable Signal (MDS) in 500 Hz BW for 6dB increase in S+N/N ratio. (One 'S' Point indicated).
Freq. MHz Signal dBm V rms (nV). Pre Amp Signal dBm V rms (nV)
10.150 -124.5 133 off n/a n/a
14.150 -126.0 112 off n/a n/a
18.150 -126.0 112 off n/a n/a
21.150 -124.0 141 off n/a n/a
24.900 -120.0 223 on -121.0 199
28.500 -121.0 199 on -128.0 89
50.500 -118.5 266 on -128.3 86
70.500 -119.7 235 on -125.5 119