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FM CB with Digital?
- Thread starter Ensnared
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ohhh ch6 guys scream AUDIO!!!!! 56 times in a hour!
nd5y
Member
It has nothing to do with low band.
If you are using DMR simplex with one time slot there is no problem.
If you are only receiving something there is no problem.
If you are using a repeater with both time slots or a simplex system with both time slots then you can have problems when users are too far away or one user is close and another user is far away. That is because of the time it takes RF to travel and the timing tolerance between time slots.
The theoretical limit is 146-180 kilometers.
See 10.2.3.1.3 Propagation delay and transmission time on page 116 of
(one of the ETSI standards documents for DMR)
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Quick question (honest). Would signaling with DTMF tones (like an older cell phone text message system) be considered digital?
Thanks
Joel
nd5y
Member
mmckenna
I ♥ Ø
DTMF would not be considered a form of digital modulation. It's just audio tones: Dual Tone, Multi Frequency, modulated onto whatever carrier the radio is using.
And as nd5y linked to, completely legal to use on CB radio.
In fact, Radio Shack sold a CB frequency based paging system at one point that I ~think~ used DTMF.
Looked it up, 27.255MHz, which was CB channel 23, but also one of the remote control radio service frequencies.
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Sorry but I just dont see any purpose for cb radio. It is subject to massive amounts of disruptive atmospheric conditions which makes it non useable. And all the people on there running power......whats the point?
Identifying the CB Savage, crashing the gate doing 98, helping Sonny and Will solve the world’s problems, running from sheriff Justice…….. It still lives for some of us.
I guess you had to be there
kny2xb
Member
I thought that I was the only one who remembers CB Savage lol [and The White Knight]
Watched Sonny & Will every week
73
slowmover
Active Member
I asked as most truck drivers are likeliest to be using AM-19 to problem-solve during morning hours.
There’s no lack of commercial traffic thru eastern PA. It’s high. But maybe you’re just far enough from IH-78 given topography. I hear plenty of good mobile radio rigs E-W thru there as well as N-S on IH-81. 422 ought to have some, too.
Pre-dawn some weekday morning would be of interest. Best conditions (lack of background noise). That’s when I believe it fair to say my radio can do X-distances both TX & RX as a control on the rest of the day as conditions deteriorate.
The most traffic I hear is on 16, and thats the tri axels hitting a few of the local quarries .
My intent (in my mind, if I ever got around to it (which is unlikely)) was for digital messaging using series of DTMF tones.
Of course if push came to shove and it turned out to be not legal, then text to voice conversion on the transmitter side, and voice to text on the receiving side, would have the exact same effect.
Thanks everyone for the replies and information, the link to the rules site was helpful.
Joel
slowmover
Active Member
Base, mobile or handheld?
Some of these shack in a box Icom HF radios with D-Star would work on CB with the MARS mod done. I've heard D-Star on HF bands many times. Sounds just like D-Star on VHF/UHF, like crap!
K6GBW
Member
The biggest problem with going to digital on CB would be that when digital signals collide you get corruption and you receive...nothing! At least with FM you get signal capture and you can hear the stronger signal, AND you know that there was someone else there. So in my opinion narrow FM for a traveling simplex radio is probably the best you can do.
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