Broadcast Technical Consulting and Sales
10032 Island Drive, Brainerd, MN
1 KW AM Four-Port RF Switch
Built by M. W. Persons and Associates, Inc.
Made in Minnesota
M. W. Persons AM RF-2 Switch
is for AM radio stations with
1100 watts or less of RF power, this RF switch
is a quick and easy way to select between a main and an auxiliary
transmitter. There are four N-F connectors for the RF. IE:
main transmitter, auxiliary transmitter, antenna, and dummy load.
Whichever transmitter is not on the air is connected to the dummy load.
There is no additional charge for
substituting SO-239 (UHF) connectors on an order.
The front control
panel lets you switch main or auxiliary transmitter to the antenna and
has LED lamps to show the operating state. The Test/Normal switch
has a blinking red LED lamp warning that both transmitters can run
simultaneously....one into the antenna and the other into a dummy load.
In the normal position, only the transmitter connected to the antenna
will be allowed to run. Both transmitters can run when the switch
is in the test position. To accomplish that, this unit has relay
contacts that go to the transmitter interlocks.
This switch is fully
remote controllable. All it needs is a momentary relay closure to
tell it to connect the main transmitter to the antenna or the auxiliary
transmitter to the antenna. Control is 24 VDC from the unit's
power supply at less than 100 m.a. of current. No power is
required from a remote control to get the switch to work, just a
closure. The unit has 2 VDC
status outputs to tell a remote control system which transmitter is
connected to the antenna.
A rear view shows the
RF compartment open for inspection. A 24 VDC wall transformer runs
the switch. In case of power failure, the main transmitter is
connected to the antenna and the auxiliary is connected to the dummy
load port. When power is restored, the last asked for operating
state is reestablished automatically.
It is 3-1/2" high, 19
inches wide, and 7-1/2 inches deep.
Because of the lead
lengths inside the box, the switch can only be used up to 8 MHz.
Higher frequencies, such as FM 88-108 MHz and higher, require a
different switch architecture. See
RF-3A and RF-4A switches.
AM RF-2 Switch,
as shown, is
plus shipping and tax.
It comes complete with a schematic
N to N RF cables
are also available.
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