Moseley Associates Inc EVENTHD ユーザーズマニュアル

The upper RSL LED meter is calibrated to represent exactly 10 dB for each LED, going 
from -95 dBm at the far left (red) to -15 dBm at the far right (green). The brightness of 

each LED is modulated for levels between 0 to 10 dB such that the far left LED will be 
fully extinguished at -95 dBm and the far right LED will be fully illuminated at -15 dBm. 

When the RSL is in the red region (<-75 dBm) the signal level is approaching or has 
reached threshold (depends on modulation type). 

The transmit LED indicates full power will all 8 LEDs illuminated to minimum power with 1 
LED illuminated. For simplex applications the both rows indicate either RSL or transmit 

power. 

The overall Event-HD digital radio architecture consists of a single 1RU rack mount 

Software Defined Indoor Unit

TM

 (SDIDU

TM

) with a cable connecting to an Outdoor Unit 

(ODU). The IF signal between the SDIDU and ODU operates at a relatively low frequency 

compared with the RF signal allowing for extensive cable runs in excess of 250 m with 
inexpensive coaxial cable with no degradation in radio performance.  

The Event-HD ODU is mounted to a fixed or telescoping antenna mast near the desired 
antenna location providing a short cable run between ODU and antenna at the RF 

frequency. This SDIDU /ODU architecture is advantageous when compared to a single 
IDU (no ODU) with external mount antenna as operating at these RF frequencies from 
the IDU rack to the antenna will result in significant signal degradation and require 

expensive low-loss coaxial cable or waveguide.