Table of Contents
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The
LPAM Broadcast Audio Processor
-- Setup and Operating Guide --
Rev. C - April 2019
(Starting S/N 026)
TABLE OF CONTENTS
.................................................... 1
.................................... 3
Intro
GAIN................................... 5
................................. 8
....................................... 9
................................................. 11
................................... 12
Problems?
............................................ 16
© April, 2019
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Table of Contents
Summary of Contents for Schlockwood SW200
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Page 1: Table Of Contents
TABLE OF CONTENTS INTRODUCTION ............ 1 Warnings NRSC Compliance Disclaimer LPAM Broadcast Audio Processor HOOKING UP THE SW200 ........3 Intro Balanced studio lines Unbalanced connections —— Setup and Operating Guide —— Mix-to-mono utility SETTING THE INPUT GAIN........5 No test equipment required AGC readout The ‘sweet spot’... -
Page 2: Introduction
10kHz mercial AM broadcasting, TIS (highway information) sys- output filter, the SW200 falls short of the published specifi- tems, and voice processing for amateur radio operators. cation as depicted in the following plot. -
Page 3: Hooking Up The Sw200
Amazon or your local music store. Mix-to-mono utility Balanced studio lines The SW200 is strictly a monaural processor, but includes a built-in utility for combining left and right unbalanced ste- The following chart gives hookup particulars for both the... -
Page 4: Setting The Input Gain
The small green GATE OPEN LED lights when a valid pro- for either balanced or un- gram is playing into the SW200. It may flash off during balanced monaural program pauses in speech, but it generally remains on during nor- feeds. -
Page 5: Take Your Time
INPUT GAIN control, then you will need writing has come under fire as a meaningless part of the to beef-up or pad-down the program feed to the SW200. NRSC/FCC specification. We repeat: the INPUT GAIN control should have plenty of With all the man-made noise prevalent on the AM band adjustment range for any program line level you’re likely to... -
Page 6: Triband Processing
Other equalizers in the audio chain TRIBAND PROCESSING ahead of the SW200 may be helpful in a few cases, but are largely unnecessary and can actually make things sound worse on the average AM radio. -
Page 7: Some Advice
Brute-force clipping doesn’t ‘pump,’ but it can One word of caution here. When developing your ‘signature sound,’ put the SW200 on air and listen over a representa- certainly add objectionable harmonic distortion. tive consumer radio. Keep in mind that the output of the... -
Page 8: Asymmetrical Modulation
IMPORTANT: Place a sticky-note somewhere on the interference on the band. This not only makes you an un- SW200 as a reminder of the change that you have just welcome neighbor on the radio dial, but it sounds bad. made! The wide output level range of the SW200 has been divided into two adjoining segments. -
Page 9: Secret Settings
SW200 (not a Here’s how to enable the 5kHz cutoff: good idea), or the music track was over-processed for the 1) Disconnect power, remove the two recessed CD or MP3 release. -
Page 10: Pre-Emphasis For 5Khz Operation
There is no need to disconnect the ribbon cable, but if you operate the SW200 with the LED board dangling, be careful that the back of the board doesn’t short-out to anything.
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