EDMI Dual Band Variant 450 Communications Hub Variant
(CS-21)
Copyright © 2019 EDMI Europe Ltd. All rights reserved
Version / Status: 1.2
Public
PAGE 21 OF 22
3.2.3
HAN Sub GHz
From fundamental theory, thermal noise floor in a 200 kHz bandwidth (at room temperature of 296
K) is: -173.87 + 10*log (200 kHz) dBm = -120.86 dBm
Adding the required minimum carrier to noise ratio of the communication scheme and the noise
figure of the Communications Hub internal design gives a minimum TRS of -97 dBm (see General
Specification above).
To maintain the HAN link budget the noise contribution from the ICHIS host has been set to 7 dB
above thermal in the 200 kHz bandwidth. This equates to: -120.86 + 7 dBm = -113.86 dBm
3.3
Spectrum Analyser Guide Settings
The following are guide sets for measurement equipment settings. These settings are refined by
ICHIS test methodology. Please see the test methodology documentation for a step by step guide
and safe working methods.
3.3.1
WAN
centre frequency
454.0
MHz
span
2
MHz
RBW
20
kHz
VBW
100
kHz
detector
RMS
Average
off
sweep speed
30
sec
ref level
-55
dBm
Attenuator
0
dB
Pre Amp
on
Units
dBm
3.3.2
HAN 2.4 GHz
centre frequency
2445
MHz
span
100
MHz
RBW
2000
kHz
VBW
5000
kHz
detector
RMS
Average
off
sweep speed
30
sec
ref level
-55
dBm
Attenuator
0
dB
Pre Amp
on
