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Transmission Transmission

STL / Microwave Links

TOPANGA

Digital Composite STL

From: Moseley

Features:
-Five Watt Transmitter Output for Robust Operation
-User adjustable 16, 32, 64, 128 QAM rate for improved Receive Threshold
-Amazing Audio Specifications: SNR -85dB, Distortion .03%; Stereo Separation > 65 dB

Topanga is the World’s First Open Architecture Digital Composite (MPX) RF Studio Transmitter Link. Topanga’s Digital platform offers greater than 20 dB System Gain Advantage over old Analog Composite systems. Topanga’s Open Architecture offers for Customization and Adaptability to changing Requirements and Technologies

According to the company, Topanga has a greater than 20 dB system gain advantage over analog composite systems which should guarantee improved signal to noise rations and stereo separation.

Besides the MPX feed, Topanga has an Ethernet interface for HD Radio data along with RS-232 channels for RDS. It can be operated through the front panel or remotely over the internet.  In addition, Topanga has Moseley’s new 5 W transmitter, which is also being added to the Starlink RF STL.

Features:

-Bandwidth 500 kHz 32 QAM Mode, 230 kHz in 128 QAM mode
-Input Level 3.5 Vp-p for 100% modulation; 4.0 Vp-p clipped
-Input Impedance 6k Ohms, single-ended, BNC
-Output Level 3.5 Vp-p for 100% modulation
-Output Impedance 75 Ohms. Single-ended, BNC
-Output Load 75 Ohms or greater, maximum load capacitance 0.047 microfarads.
-Maximum recommended cable length 100 ft RG-58A/U
-Signal-to-Noise Ratio > 85 dB (de-emphasized, 20 Hz – 15 kHz bandwidth, referenced to 100% modulation, unweighted).
-Distortion ≤ 0.05% THD (de-emphasized, 20 Hz – 15 kHz bandwidth, referenced to 100% modulation, unweighted).
-Stereo Separation >70 dB, 30 Hz – 15 kHz (referenced to 100% modulation = 3.5Vp-p) (for 500 kHz System)
-Crosstalk-Linear > 80 dB, main channel to sub-channel or sub-channel to main channel (referenced to 100% modulation).
-Crosstalk-Non-Linear > 80 dB, main channel to sub-channel or sub-channel to main channel (referenced to 100% modulation).