Brochure PDF
TR-6000 Low Power
AM Transmitter
AM Broadcast Band Fiberglass Antenna
The "Phase II" CP-15 Coupler

Radio Systems’ CP-15 is an antenna matching unit designed specifically for use in combination with the TR-6000 AM broadcast transmitter.

Radio Systems’ CP-15 Coupler is an unique antenna matching device with sophisticated, specialized circuitry for low power AM broadcasting. A specially-developed, two-stage system is employed for impedance compensation. Two broadband transformers are combined to provide a total of 15 impedance settings. A decade capacitor switching system is also incorporated to provide reactance correction and cancel any antenna grid reflection of radio energy.

The proper combination of impedance and reactance settings is determined throughout the internal bridge circuit. The meter allows the “nulling” of reflected power and maximization of transmitter to antenna energy transfer. In the match mode, 90% of the transmitter power is automatically “dummy loaded” to protect the transmitter circuitry.

Direct SWR Readings:
The “Phase II” coupler has a bridge and meter circuit which can be used to directly read the standing wave ratio of the carrier signal. Transmitter to antenna match can be quantitatively evaluated and a direct ratio calculated.

Improved Matching:
The CP-15 two stage coupler, with integral reactance and impedance compensation, provides an exact match into a wide variety of antenna systems. This efficient energy transfer insures maximum signal strength and radio coverage while protecting the transmitter from damage due to high VSWR conditions.

For Carrier Applications:
Existing electrical wiring is frequently used as an antenna for low power systems. This wiring, not intended for energy at RF- frequencies, present a hostile environment for radio frequencies. The CP-15 Coupler has been designed to efficiently transfer RS energy into these antenna systems and protect the transmitter unit. Up to three output circuits for three-phase power systems provided are fuse protected and supply high voltage, high pass capacitors.

For Antenna and Travelers Information Applications:
Use the CP-15 to match into “High-Q” (short and intermittant center-loaded antennas) and long wire antennas to achieve low VSWR conditions.

Power Input 20 watts RMS maximum
Input Impedance 50 ohms unbalanced
Output Impedance 1 to 50 ohm in 15 ranges
with built-in capacitance decades
Matching Circuit Two stages: multifilar wound
ferrite transformers
Metering VSWR bridge, forward
and reflected readings
AC Line Connection 500V maximum, line to line and ground
Size W-9” H-9” D-3”
Weight 5.5 lbs.

1 year - parts and labor

Radio Systems, Inc.   •   601 Heron Drive   •   Logan Township, NJ 08085  •  Phone: 856-467-8000   •   Fax: 856-467-3044