Transmitting on 15 channels.....at the same time?

[144inBama]

About an hour ago I was riding down the road listening to 19 for traffic info and police locations, when this guy starts talking. Well after a few minutes I thought he was ghost talking because I couldn't hear anyone else. Well I start to flip to 28 and hear him on 20...21, 22, 23 24, & 25, not bleed but 100% clear and his signal never changed. I drop down the other way and hear him down to 11....100% clear. Hell, I thought my radio was stuck on 19 but the freq counter was changing and I could hear other people on those channels. I've been playing with CBs for a long time but have NEVER heard the likes of this. Any idea how this was happening? His numbers are 147 in lower Alabama, I'm guessing about 100-150 miles from me.

 

[Dmans]

Crap Radio with lots of power.

73
David

 

[144inBama]

Crap Radio with lots of power.

73
David

That's what I said, but the clearness and steady signal just really confused me. I honestly still can't grasp it, I've heard crap splatter boxes and this one didn't sound bad at all. Almost like his radio was tuned for that purpose....I really wish y'all could have heard it.

 

[The20poundhammer]

Ummm no thats not cross channel splatter its something called The World of Sound trust me with the right person using the thing it is something you wish they had stuck up their azz lol

 

[ForestRunner98]

All it means is that he just got down!!!!

 

[144inBama]

Ummm no thats not cross channel splatter its something called The World of Sound trust me with the right person using the thing it is something you wish they had stuck up their azz lol

Is it a mod or additional board or something? I've never heard of it.

 

[nomadradio]

Hypothetically speaking, if you generate a 10 kHz square wave of around one Volt and inject it into the varactor-diode circuit in a PLL radio's VCO you'll get FM sidebands.

The FM sideband of a carrier is... a carrier. And it will be separated from the original carrier by the modulation frequency. And a 10 kHz FM modulation will have sidebands every 10 kHz. How many of them depends on the modulation level. The FM-modulation level, that is.

Crank up the level of that square wave, more sidebands. There is a phenomenon called the "Bessel null" that will cause some of the sidebands to be weaker than others. This depends entirely on the FM-modulation level of the square wave.

Those FM sidebands will be clean-sounding "clones" of the AM signal on the original channel frequency.

If it's done right.

Hypothetically, anyway.

73

 

[Crawdad]

Twilight Zone??

 

[dave457]

I remember mustang 131 saying he has I believe 148 that has been modded to transmit on all 40 chs at once

 

[NZ8N]

Hypothetically speaking, if you generate a 10 kHz square wave of around one Volt and inject it into the varactor-diode circuit in a PLL radio's VCO you'll get FM sidebands.

The FM sideband of a carrier is... a carrier. And it will be separated from the original carrier by the modulation frequency. And a 10 kHz FM modulation will have sidebands every 10 kHz. How many of them depends on the modulation level. The FM-modulation level, that is.

Crank up the level of that square wave, more sidebands. There is a phenomenon called the "Bessel null" that will cause some of the sidebands to be weaker than others. This depends entirely on the FM-modulation level of the square wave.

Those FM sidebands will be clean-sounding "clones" of the AM signal on the original channel frequency.

If it's done right.

Hypothetically, anyway.

73

But, wouldn't that cause the PLL to trip the Lock Detect circuitry? It would "see" it as an "Out Of Lock" condition, and shut down the TX switching circuit.

It could be done secondarily like adding a Direct Sequence modulator (Spread Spectrum) to the signal between the TX mixer and the TX buffer. Or before the Carrier injection side of the TX mixer, after the SSB filter if an SSB radio.

 

[hpssb]

**** re-post from earlier thread on the same subject ****

Found this mod in an old GE A model we bought at a yard sale.

GE was rusted out dead beyond repair it had been in a wet barn for decades.

But built a new circuit as above and put it in a working cybernet base radio.
And it works real good, put radio on channel 32 and it transmits on every channel from 23 to 40 at the same time. Never had so much fun with a dollars worth of parts.

Local ham wanted to know how the heck I did it. Told him I pulled the channel knob off and attached a power drill to the shaft and pulled the trigger. The funny thing was I think he believed me LOL

Not sure of how such a simple circuit works, i'm an electrician and radio tinkerer but no technician. Will forward this thread to our tech for an explanation if no-one can tell me how it does what it does.

Its not a fully wideband transmission though. Listening on a ham rig with a vfo and tuning up and down shows that the duplicated channels are only every 10K, i.e. you cant hear the transmission on 27.360 but you can on 27.355 and 27.365 megs.

The mod also works on reception. Put radio on channel 32 and you can hear conversations on every channel from 23 to 40 at the same time. But nothing is received when the ham radio rig transmits on a zero frequency such as 27.360 megs. Strange.

Any explanation how this thing works without getting too technical?

Loz!

 

[Low_Boy]

But I imagine you can only receive on 1 ch?

 

[Handy Andy]

But I imagine you can only receive on 1 ch?

In personal experience with "Monsters" like shown above. They CAN receive, but there is no SELECTIVITY regarding the reception. The noise level from the "crosstalk effect" makes it less useful for reception.

But if you had 40-other CB radios for RX - tuned to the other channels with their squelch and RF Gains set properly for RX (OR fewer with Scan modes can be used) - you can easily set up a wide band Base to Mobile network. Each mobile can be assigned a channel and the Base simply broadcasts to all.

It's similar to spread spectrum and trunk systems used now. Only coded-squelch and Digital ID and encryption systems used now, makes this seem archaic.

In some countries, this is being used now.

 

[hpssb]

But I imagine you can only receive on 1 ch?

No, it receives on 15 channels at the same time when the wide band switch is turned on. If there are people talking on say 30, 33, and 38 they all come through clear at the same time, just like they are all on the same channel, if the modded radio is on any channel from 23 to 40.

Loz!

 

[144inBama]

I'm all for cool and novel things, but this creation seems more of a inconsiderate, a$$hole move. You're killing skip for people who aren't even close to your channel, because all they can hear is you.