User's Guide

Revision 19.1
SOLO7 Transmitter User Guide
Copyright © 2013 Domo Tactical Communications (DTC) Limited. All rights reserved.
Commercial in Confidence
Page 6-36
6. Advanced Operation
6.1 High Linearity and Low Power Modes
Refer to Section 5.5.2 .
6.1.1 Low Power Mode
Low Power Mode optimises DC power consumption but to do this it must compromise the quality of the
COFDM waveform shoulders. Compromising the shoulders often makes little difference operationally when
you just need to get a short-range link in a reasonable RF environment.
What Low Power Mode does do, however, is save a considerable amount of power so you can deploy a unit on
batteries for extended times.
The table below gives power consumption figures for SOL7TX when in Low Power Mode:
RF Output Power VHF/UHF L-Band S-Band
10mW (10dBm) 3.1W 3.3W 3.4W
50mW (17dBm) 3.4W 3.6W 3.7W
100mW (20dBm) 3.7W 3.9W 4W
6.1.2 High Linearity Mode
CAUTION: The combination of 100mW output power and High Linearity Mode must only be used with
additional cooling, either extra heat sinking or a fan.
High Linearity Mode optimises the quality of the COFDM waveform shoulders but to do this it must increase
DC power consumption.
This mode can be useful when you are using an external amplifier which always expects very high-quality
shoulders to work at its best.
Also, in busy RF environments you’ll need excellent shoulders to reject adjacent channel interference.
The tables below give a comparison between the modes across different frequency bands:
DC Power RF Power Out (dBm) Current (mA) Mode Wattage
10 20 395 Low 3.95
10 17 330 Low 3.30
10 10 300 Low 3.00
10 20 455 High 4.55
10 17 380 High 3.80
10 10 320 High 3.20
Table 6-1 Typical Power Consumption 1650 to 2400MHz (High L and S-Band)