Radio Navigation Equipment - Signalspaning.se

Radio Set AN/MRN-2 is a ground, mobile, twocourse
VHF aural radio range with station identification,
periodic sector identification and simultaneous voice transmission.
It is a crystal controlled set and operates in the
frequency range of 100 to 156 mec. for use in guiding aircraft
equipped with VHF communications receivers, such
as Radio Set SCR-522, to landing field, or for use in flying
ferry routes.
Adjustable overthefrequ icy band of 100 to 156
mc., operation without readjustment is limited to a band
of 5 mc. The equipment, including the antenna, can be readjusted
to any frequency within one-half to one hour provided
the necessary crystals are available. The selection
of operating frequency depends on the proposed use of the
equipment.
Considerable attention to siting the VHF radio
range equipment is required. The use of vertical polarization
gives rise to some reflection from trees within 500
feet of the radio range site. Thus it must be located in a
cleared space of 500 feet radius. To obtain nearly perfect
courses a cleared space of 1,000 feet radius is recommended.
Extensive flight tests indicate that course bends
produced by the location of Radio Set AN/MRN-2 in mountainous
terrain are not too severe to make its operation
unsatisfactory; bends produced by location of the transmitter
in a valley are more severe thanthose produced by
its location on top of a mountain; location ontop of a mountain
greatly increase- distance range obtained; and oper -
ation of the voice modulation channel is very satisfactory.
Power for operation is furnished by a 2 KVA gasoline driven
power unit.
TUBE COMPLEMENT
NO. TYPE NO. TYPE
1 6B8 4 807
3 6H6 2 829
2 6J5 2 832
2 6SJ7 6 836
3 6SN7GT 1 2050
3 6V6GT 1 OD3/VR-150
2 6X5GT 1 6SK7GT/G
5;
k 1 C d $. I
~g 1--1
Range Transmitters installed in forward part of truck.
Test equipment required for maintenance and
tuning is furnished with the basic equipment.
There were no Army Supply Program requirements
as of 1 February 1945.
POWER INPUT 200 WATTS @ 115 VOLTS
60 CYCLES
POWER OUTPUT CONE OF SILENCE-25
WATTS: TRANSMITTER
CARRIER - 100 WATTS
SIDE BAND -50 WATTS
FREQUENCY 100-156 MC.
TYPE OF SIGNAL CW: MCW: VOICE
RANGE 100 MILES
ANTENNA POLARIZATION VERTICAL
Radio Set AN/MRN-2, a ground, mobile two course VHF aural radio range, provides station identification,
periodic sector identification and simultaneous voice transmission.
May 1945
AN/MRN-2