I need help for to find PRO mts channels
 

hi all

i can't find any info about The fourth channel, PRO related to encoding and receiving broadcast equipment .......:scratch2: a Link Feed ....modulator

AND mts spectrum like fm https://6904462f-a-62cb3a1a-s-sites....attredirects=0[IMG]Attachment 202130tp://www.videokarma.org/attachment.php?attachmentid=202130&stc=1&d=1610607 448[/IMG]https://i.ebayimg.com/00/s/MFgyMTQ3N...Q8G0O/$_61.JPGhttps://i.ebayimg.com/00/s/MFgyMTQ3N...Q8Gqs/$_61.JPG

This wikipedia article specifies the frequencies of all the subcarriers including PRO:
https://en.wikipedia.org/wiki/Multic...audio_channels

http://www.lenrek.net/experiments/bt...c-spectrum.png:scratch2:http://www.wa2fnq.com/atv/btsc.jpg:thmbsp:Dolby Surround encodes four channels of audio into a mono, stereo and - therefore - BTSC-compatible, two-channel signal; after decoding, it produces four channels of audio.

That's a cool graphic....If I'm interpreting it right then TV stereo and SAP are implemented in essentially the same way as FM radio MPX stereo and SCA. Basically FM modulate an audio signal that contains an ultrasonic pilot tone and the difference signal AM modulated on an ultrasonic carrier. With SAP and SCA implemented similar to the difference signal only higher into the ultrasonic/low RF range.

I know in MTS stereo they used the columbia CX noise reduction system. CX was designed for LPs but failed in that market but was used in CED, and survived the century in TV MTS stereo and as a standard in LD audio tracks.

Dolby Surround encodes four channels of audio into a mono, stereo and - therefore - BTSC-compatible, two-channel signal; after decoding, it produces four channels of audio.

SO
DO you remember any Dolby Surround AIR encoded content on muVies channels and VCR DS DECODERS

I have an old fisher amp that with that dolby decoder. I used to use it mainly as a remote AV switch till some of the jacks got flakey...I may fix it soon since another home theater amp that replaced it won't power on.

Cable used that surround over stereo format right until the end of analog a few years ago and it still exists in VHS tapes, LDs, DVDs etc.

That dolby surround over stereo matrix is very similar to the 1970s SQ and QS methods of recording quadraphonic sound onto stereo LPs...it's so similar that if you unplug your sub woffer, run phantom center channel mode, and reverse speaker polarity on certain speakers you can use one of those dolby decoders to play SQ Quad LPs in quadraphonic sound....to an extent you can do the reverse (play the dolby surround with a QS decoder) too.

The Panasonic RD9610
 

1986 Pioneer VZ-100 Multi-Channel TV Sound Decoder
 

LOL

i first hear this :thmbsp::yes::scratch2::tresbon:

fascinating https://www.analog.com/-/media/image...ig02.gif?la=enhttps://i.ebayimg.com/images/g/GxYAA...5L/s-l1600.jpghttp://videokarma.org/attachment.php...1&d=1610940405

RRS McMartin Model TR-E5B Radio Reading Service Receiver
 

The receiver you have, is a McMartin SCA receiver (Subsidiary Communications Authorization). Which is rarely used anymore today. This service was used for radio reading service for visually impaired and print handicapped users, background music services for stores, offices, and industry, and was subscription based. FM Radio based, not TV based. Has nothing to do with MTS in any form, let alone Pro.