epfdtracktrunker
Member
Would it be possible to digitaly modulate the voice in an LTR Regular/Passport/MultiNet system?
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Digital LTR
- Thread starter epfdtracktrunker
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N_Jay
Guest
epfdtracktrunker said:
Not easily.
(Nothing is "impossible")
It is highly unlikely, as there would be no good reason to do it.
LTR is usually used for its low cost, no major manufacturer is doing any new development on it.
epfdtracktrunker said:
The digitally modulated signal would probably not coexist well with the digitally modulated subaudio tone that carries the LTR control information. Once you've got a digital signal - you can combine voice and control in the same data stream. At that point, it really wouldn't be LTR.
-rick
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N_Jay
Guest
rfmobile said:
Rick, you are not thinking creatively enough. Just segment the FM carrier in to two pass bands and use a digital modulation that does not rely on frequencies below the cut off for the voice information, and send the LTR information below in the lower pass band.
(Nothing is impossible, juts impractical and without a rational market)
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N_Jay
Guest
Oops, for got this.
That seems to be how the multinet Transcrypt scrambler boards work (480) series. You can hear a constant quiet digital data stream in the background that syncs the split points.
mancow
mancow
There was a company that tried to make a digital LTR system a few years ago, I don't remember the name of the company, but they went out of business. I believe that their first "test" system was installed in Mexico and that is as far as it went.
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N_Jay
Guest
Wow, someone tried it.
I like the 8 to one channel split with no range degradation.
http://www.bizjournals.com/dallas/stories/2001/07/16/daily31.html
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Digital LTR radio and base station designed to allow one-channel-at-a-time migration, using existing analog infrastructure. At 25kHz, DC/MA technology (digital channel multicarrier architecture) transforms one analog channel to eight digital channels and provides a coverage area equivalent to a standard FM footprint.
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I like the 8 to one channel split with no range degradation.
http://www.bizjournals.com/dallas/stories/2001/07/16/daily31.html
------------------------------------------------
Digital LTR radio and base station designed to allow one-channel-at-a-time migration, using existing analog infrastructure. At 25kHz, DC/MA technology (digital channel multicarrier architecture) transforms one analog channel to eight digital channels and provides a coverage area equivalent to a standard FM footprint.
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N_Jay
Guest
LTR said:
No wonder, you are not going to stay in business promising things that can't be done!
It would have been nice to have, like you had said in your previous post, the 1 to 8 split would have been great, but obviously something didn't work out right.
I remember in the beginnings of ComSpace, (and they might have had a different name at that time), they had a connection with Kenwood Communications, but Kenwood was not part of it later on.
I remember in the beginnings of ComSpace, (and they might have had a different name at that time), they had a connection with Kenwood Communications, but Kenwood was not part of it later on.
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