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How to keep out unauthorized users?
- Thread starter ASAD
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- harmful interference
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Drachen_Fire
Member
Be careful with the password protection advice. It's a great way to lose customers. One major dealership here almost lost a million+ dollar contract by doing exactly this to an entire township's fire department.
RAC is Repeater Access Code, standard practice for MDC accessed repeaters. It is a Motorola product, although some other MFRs have it now. I'm pretty sure Hytera, Kenwood, and Harris all offer repeaters capable of MDC.
RAC is Repeater Access Code, standard practice for MDC accessed repeaters. It is a Motorola product, although some other MFRs have it now. I'm pretty sure Hytera, Kenwood, and Harris all offer repeaters capable of MDC.
BirkenVogt
Member
Is this an ongoing problem or a hypothetical? I assume this is a community tone repeater system? What model is the repeater?
The way I would approach if it were these things is to have the repeater only repeat when it receives a valid tone, PL or DPL, and then figure out who is pirating once they have gone to the trouble of stealing the tone of one of your valid customers.
The way I would approach if it were these things is to have the repeater only repeat when it receives a valid tone, PL or DPL, and then figure out who is pirating once they have gone to the trouble of stealing the tone of one of your valid customers.
When you say interference, do you mean you hear other co-channel users that are also licensed to the same frequencies or are they illegal users that have hacked their way in and causing interference to legal users?
There's no repeater involved. We sometimes copy individuals that we don't know. To be more specific, our location is Dubai, we hear language that we don't speak. Is there a way except for CTCSS/DTCS to keep unwanted conversations out? Even with different PL tones, if they transmit at the same time we do, radio will open the squelch. Right?
cabletech
Member
Think of a radio freguency as a vehicle hyway. Just so many to go around for the large amount of users.
CTCSS/DPL tones help you to keep from hearing the other users on the frequency unless they are using the same tone as you.
If you are hearing these other users all the time, then change your tone.
In Dubai, the same as in the USA, there are many differant language speaking people, so it is not uncommon to hear a differant language.
All of this does not make them an unauthorized user.
CTCSS/DPL tones help you to keep from hearing the other users on the frequency unless they are using the same tone as you.
If you are hearing these other users all the time, then change your tone.
In Dubai, the same as in the USA, there are many differant language speaking people, so it is not uncommon to hear a differant language.
All of this does not make them an unauthorized user.
Not knowing the rules and licensing in Dubai, it would be difficult to really give you a straight answer. Of course CTCSS or DCS would keep you from hearing the other users, they would still be there and if their signal is strong enough they would still override your users regardless of the use of sub audio signaling.
In the US there is a requirement to monitor before transmission, so we by rule are supposed to disable any secondary circuitry to be able to listen in carrier squelch.
If the frequency you operate on is licensed, you could also ask for a new frequency or if you are on a shared frequency, such like the US MURS or GMRS channels, you can apply for licensing a frequency that should have less users on it.
SpectreOZ
Member
Is your radio fleet a centralised dispatch system? do you want/need radio to radio direct comms?
Splitting your TX/RX frequencies can be used in a dispatch scenario (to avoid simplex interference) whilst ensuring each radio has an additional "non offset" channel could still permit point-to-point traffic, for example...
Base - Transmits ChA / Receives Ch B
Portables - TX ChB / RX ChA
Simplex - ChC TX/RX
Splitting your TX/RX frequencies can be used in a dispatch scenario (to avoid simplex interference) whilst ensuring each radio has an additional "non offset" channel could still permit point-to-point traffic, for example...
Base - Transmits ChA / Receives Ch B
Portables - TX ChB / RX ChA
Simplex - ChC TX/RX
Drachen_Fire
Member
Yeah, just put CTCSS or DCS on it. Easy deal.
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