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Part One - Total Harmonic Distortion
====================================
Main RX, 3750 kHz, AM
PREAMP OFF, ATTN OFF, RF GAIN 100
ROOF 20 kHz, BW 6000 Hz, PBT 0 Hz
modulation freq = 300 Hz, modulation depth = 50 %
carrier level = -53 dBm (S9 + 20 dB)
measured at speaker output with external 4 Ohm speaker connected
Total Harmonic Distortion
in Percent
HANG dB/s 1.373b5 2.056
-----------------------------
0.3 5 0.41 0.44
0 5 1.27 0.65
0 50 4.8 3.1
0 100 8.0 5.8
0 200 13.4 10.5
0 500 24.5 21.4
0 1000 35 35
Orion can deliver up to 1.4 W into 4 Ohm load with
less than 0.5 % THD, using HANG of 0.3 seconds and 5 dB/s.
This is a static mesurement in laboratory conditions.
On the air performance seems to be affected a lot by selective fading.
Part Two - Frequency Response
=============================
Sub RX, V2.056, 900 kHz, AM 50 %, BW 6000 Hz.
measured at speaker output with external 4 Ohm speaker connected
Frequency Response in dB
PBT setting
freq 0 Hz 1200 Hz
----------------------
400 0.0 0.0
500 -0.1 -0.1
600 -0.2 -0.15
700 -0.35 -0.3
800 -0.5 -0.45
900 -0.7 -0.55
1000 -0.9 -0.75
1100 -1.0 -0.9
1200 -1.2 -1.05
1300 -1.4 -1.2
1400 -1.5 -1.35
1500 -1.7 -1.45
1600 -1.8 -1.55
1700 -1.9 -2.1
1800 -2.0 -5.9
1900 -2.05 -7.7
2000 -2.1 -7.6
2100 -2.2 -7.7
2200 -2.25 -7.7
2300 -2.3 -7.7
2400 -2.3 -7.7
2500 -2.3 -7.7
2600 -2.35 -7.7
2700 -2.35 -7.8
2800 -2.35 -7.8
2900 -3.15 -7.8
3000 -12.6 -7.8
3100 none -7.7
3200 none -7.7
3300 none -7.6
3400 none -7.5
3500 none -7.4
3600 none -7.3
3700 none -7.2
3800 none -7.05
3900 none -6.95
4000 none -6.9
4100 none -7.6
4200 none -17.1
An attempt to shift PBT by 1200 Hz in order to obtain wider response,
results in response being DOWN by almost 6 dB from 1850 Hz up.
The weakened response continues up to 4.1 kHz.
Part Three - Equipment used
===========================
HP 33120A Function Generator
R&S SME 03 Signal Generator
Amber 3501A Distortion & Noise Measurement System (True RMS)
TDS 3054 Oscilloscope
73,
Sinisa YT1NT, VE3EA
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