J-340 10-40 WATT FM TRANSLATOR     DESCRIPTION     The J-340 was the first of its kind to be type accepted for use under the 1991 FCC rule changes and meets or exceeds all past and present application FCC part 74 requirements. RF output is now variable and is determined by factors at the translator site. As a result, this unit has been TYPE ACCEPTED for 10-40 watts and is approved to drive higher powered amplifiers. The new, tighter FCC frequency tolerance of +/-2000 Hz is easily met by this unit. Improved IF filtering address today's "busy" RF sites and are considered standard equipment.
    The J-340 is not a converted exciter or baseband unit, but is a dual heterodyne conversion FM translator much the same as its small cousin, the J-317. This unit utilizes a MOSFET front end, dual gate mixing, latest state of the art IF filter networks, two independent AGC loops, five stages of limiting, and positive muting action. The RF output is regulated for signal variation and line voltage changes. Metering includes forward and reflected power, AGC (relative signal strength), along with power supply voltage and currents for the various stages. Additionally, the output power stage is protected in the event of serious load changes by a special power reduction circuit. For locally originated announcements, as per FCC requirements, an optional built-in audio exciter is available. A high quality demodulated output is also built in for subabudible tone controls and monitoring. The J-340 can also be configured for "SATALATOR" service for mono, stereo, or composite audio input.
    Modular construction permits ease of access to all components for service, test and part replacement. As much as possible, standard, high quality parts are used throughout. Replacement parts are available either directly from the Tepco Corporation, or through numerous part suppliers. All units are environmentally tested at the factory under operating conditions via a computerized test program. A printout of this accurate, unbiased data is shipped with each unit for verification and future reference. The warranty covers all parts and workmanship for a period of one year.
  SPECIFICATIONS  

RECEIVER

Frequency	Any frequency from 88 to 108 MHz
RF Output Impedance	50 or 75 ohms
Sensitivity (For 30db of quieting)                 (For 50db of quieting)	2uV across 50 ohms  10 uV across 50 ohms
Noise Figure	4db
Automatic Gain Control Range	120dB
Bandwidth	240KHz
Image Rejection	100dB
RF Input Impedance  UHF connector standard (other connectors available)	50 or 75 ohms

 

TRANSMITTER

Frequency	Any frequency from 88 to 108 MHz
Type of Emission	180F3
Rated Output Power	10 to 40 watts
Power Output Regulation	Within 1% for any change In signal Input level or AC line variation of 10%
RF Output Impedance. UHF connector standard (other connectors available)	50 or 75 Ohms
Harmonics	-80db or better
Spurious Output (600 kHz removed)	-80db or better
FM Signal To Noise Ratio	-70db or better
AM Noise (Referred to carrier) Ratio	-65db or better

 
 

OTHER

Overall Frequency Stability	+/-1800 Hz from -30 to +50 deg C
Intermediate Frequency	10.7 MHz
Power Requirements: For 40 Watts RF	AC: lOOVA or DC: 2.8 Amps at 28 Volts
Optional Audio Modulator	As per 74.123
Dimensions	19" by 13" x 3 1/2"
Weight	25 lbs (Approx. 30 lbs. shipping)

     Tepco Corporation 2603 S. Hwy 79 P0 Box 1160 Rapid City, SD 57701 (PO Box zip 57709) Phone: 605-343-7200 FAX: 605-343-7240   email   Back Home