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BARRETT PRC-4090 TACTICAL HF SDR TRANSCEIVER - APPENDICES
Weather Conditions
Certain weather conditions will also affect HF/SSB communications. Stormy
conditions will increase the background noise as a result of static caused by
lightning. This background noise could rise to a level that will blank out the
signals you are trying to receive.
Man-made Electrical Interference
Interference of an electrical nature can be caused by overhanging power lines,
high power generators, air-conditioners, thermostats, refrigerators and vehicle
engines, when in close proximity to your antenna. The result of such interfer-
ence may cause a continuous or intermittent increase in the level of background
noise.
System
Configuration and Installation
The method in which your system is configured and installed will also affect the
success of your HF/SSB communications. Your choice of antenna system and
power supply is critical. Correct installation is also extremely important. An HF/
SSB transceiver is generally installed using different rules to those used to install
VHF or UHF transceivers. Failure to correctly install an HF/SSB system will greatly
affect the communications quality you will obtain.
Your local Barrett representative will be able to assist with your system config
-
uration and/or installation.
HF Communications Compared with VHF or UHF Short Distance
Communications
Communications on any HF/SSB transceiver will sound different to that on a
VHF (Very High Frequency) radio or UHF (Ultra High Frequency) radio or tele-
phone. This is because of the nature of HF propagation and the modulation
methods used. On HF/SSB transceivers there will always be background noise
evident behind the signal you are receiving and this will increase when there is
electrical interference or thunderstorm activity in the area.