Can you explain a little bit more what you heard? I’ve been listening and haven’t heard anything different or unusual. What you maybe hearing is the MDC1200 ID being transmitting from the VX-P824. It sounds a little different transmitting from these radios than it does from the other radios.
Haven't heard anything yet. Back in 2019, it was said to be 3-5 years... so we are coming into that timeframe soon.
It’s a tone remote from the voting comparators not the radios themselves… 99.9% of public safety dispatch consoles are 4-wire systems… meaning they can listen and transmit simultaneously… look up tone remote on Wikipedia… those are a little more then just regular courtesy tones… there’s a 2150Hz tone u hear and then a sub-audible carrier tone then a lower frequency audible ending tone
Yeah I I meant the 2175hz first then the middle one is the subaudible carrier correct?
Standard tone remote control is 120ms of 2175 at 0 dBm, 40ms of 1950 at -10 dBm and then continuous 2175 at -30dBm during the transmission.
Now question… by no means I would ever intentionally commit an illegal act and I’m never condoning such….. but for example what if a portable keys up with the same tone encode pattern of the remote?
That's not how it works. The tones are for direct wireline control of a repeater, not over the air. Keying up on a repeater input will key up the repeater regardless.
So if a portable is programmed with the same exact freq/timing of tones it’s just gonna sound like a a tone remote soup sandwich? 😂 😂 😆
If the portable sends the tones after the repeater is already keyed it may or may not be audible over the air. It might even cause the audio to cut out during the tones. Some receiver voting systems use similar tones to indicate an idle condition. GE used 1950 and Motorola 2175 on some versions of their voters so the tone would cause the voting selector to mute. And, the 2175 tone is filtered out of the TX audio so you only may hear the bleed over if the tones are sent at a vey high audio level. If someone wanted to be disruptive this would only be a minor noise nuisance compared to other possibilities. There are different scenarios depending on if the system is just a normal repeater or it is a receiver voting system with the voter tone keying the transmitter. In any event, it is unlikely to effect any system control function. It will only be one more type of annoying noise.
Tone remote is very critical on audio levels so many glitches are possible but usually not from anything in received audio. I had a case of a system that used a non-standard function tone for F2 that triggered the telco equipment on the lease line into loop back whenever they tried to use F2 TX.
So any adjustments are essentially done the same way u adjust settings on your home router
Wow no wonder a tone remote Costs so much $$$$ … most people just think it’s a courtesy tone lmao
Tone remotes are a niche product. Compared to 30 years ago, there are a handful of manufacturers that work with it, and much of the legacy products were deadlined with narrowbanding. I just bought a few VTE-1 voting tone encoders to use with an analog comparator I had sitting on a shelf. The costs were fairly reasonable, all things considered. The big problem is maintaining audio characteristics from the receiver to the comparator. So long as there's an acceptable bit error rate, that's not as much of a concern in digital.
