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The repeater controller system is being built in several stages:
Currently,
a simple controller based on a PIC16C84 (on the left) is being
completed.
This controller can select one of four video sources and one (or more)
of three audio sources to be output. It can individually control the
Visual
and Aural transmitter, effect a powerdown mode of the repeater and shut
off some of the auxiliary equipment not needed in a standby mode,
receive
configuration and control information via an FM control link, and
provide
status feedback of the repeater's current state.
In the (hopefully) near future, work will begin on a more sophisticated
controller - but a slave to the simpler PIC-based controller - that
will
provide more functions, remotely programmable overlay and graphic
capability,
remote program uploads, and interfacing with other systems at the site.
Details are still being worked out.
Sync regeneration is necessary on an amateur television repeater because of the varying quality of the signals being put into it. For example, many amateur signals have compressed sync, or will have noisy video. The modulator needs to have a fairly clean sync on its incoming video in order to properly perform the needed DC restoration prior to being modulated and transmitted.
Audio processing is in the design/discussion stage. The intent is to
provide remotely adjustable gain, signal routing and mixing, and
adjustable
soft and hard clipping. This is expected improve the quality and
consistency
of the repeated audio.
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