[Milsurplus] AN/MRC-99 - great station for field day

[Nick England]

100kw feeding a 10,000 ft vertical
http://www.navy-radio.com/xmtrs/vlf/mrc99-vlf-01.jpg
http://www.navy-radio.com/xmtrs/vlf/vlf-trans-1963-01.jpg

*Communication Set, Radio AN/MRC-99(XN-1)* is a broadband transmitting
communication system having transportable capabilities that only a mobile
installation offers and serves as an emergency long range communications
facility for short term use. The transmitting system operates within the
frequency range of 15 to 30 kilocycles. A radiated power of 100 kilowatts
or greater is available between 20 and 30 kilocycles with a somewhat
reduced power handling capability from 15 to 20 kilocycles. The most
significant difference between this transportable very low frequency system
and any other very low frequency system is the unique antenna
configuration. The antenna is a long-line monopole, up to 10,000 ft in
length, that is vertically suspended by a V- shaped balloon. Because of
this design feature, the system offers relatively high antenna efficiency
and broadband transmission capability. The land-based system is contained
in a fleet of 12 semi-trailers and support vehicles and is capable of
traveling over class 1 roads, gravel roads, and improved terrain to a
suitable location for system set-up, launch, and transmit. A reasonably
fast set-up time of four to six hours is possible with a trained and
experienced crew, assuming relatively level and clear terrain and suitable
weather conditions. When the system arrives at a proposed site, an
octagonal-shaped launch/retrieve area, approximately 65 feet on a side, is
laid out using a triangular survey template. Launch site communication and
exterior lighting equipment are installed, and a radial wire ground system
is constructed outward from the periphery of the launch area. Operating and
support trailers are then positioned and inter-cabled.
Nick England K4NYW
www.navy-radio.com
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