Programming both Rx & Tx
- Thread starter jwkeene
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doctordialtone
Member
If you have the correct information, you should only need one frequency. (Unless it's a Trunked System.)
Can you post a link to an example?
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Are you talking about repeater input and output frequencies?
majoco
Stirrer
I guess you're thinking about a repeater system. The site of the repeater is chosen to cover a wide area for both reception and transmission so is usually on the highest point, a hill or even a mountain. The receive and transmit frequencies are different of course, for instance the amateur 2 metre band frequencies are 600kHz apart and the 70cm band 5 MHz apart. There is little point in you programming the repeater receiver frequency as you will only hear someone who is near to you maybe only a mile or so, but if you listen on the repeater transmit frequency you should hear everything that the repeater hears - usually the published frequency is the transmitter output frequency.
The only time I used to do that was when I would get the "our radio doesn't work right" complaint, and I'd scan the bank of frequencies with repeater inputs to listen to what the repeater hears before it retransmits. Cursory diagnostic tool to find if someone played with the MPL/OST (mutiple PL / operator selectable tone - back when that was the thing.) and was on the wrong PL/DPL setting for that repeater.
It has its purposes.
Some (make that a very few) systems use the repeater input frequency as a direct or "talk around" frequency, using a different access tone than the repeater. It's not a common practice in the USA.
You most likely won't hear anything on a TX frequency if you aren't in the immediate area of the transmitting unit (a few hundred yards at the most). Similar to simpex ops. RX frequencies are repeated, that's why you can hear them over greater distances
The few times I saw it, was the repeater output, and the channels were almost always CSQ. This way people would still hear the repeater traffic coming thru.
About the only places this would be effective is where they are still on VHF Low and repeaters are not used. This is becoming rare, however. Definitely "old school" of some 40 years ago.
There are times where I also monitor the repeater input. There is several areas in my county where coverage is nil for the repeater.
Because of my location and equipment I can monitor it. Even had an incident where I was called by dispatch because a unit couldn't hear a unit and was very broken getting into the repeater but he could hear the repeater. I did a "poor man" phone patch, (Phone on speaker near the scanner so they could hear what the unit was saying).
So there are times where it is helpful.
I have all the inputs (analog) programmed in, just skipped in the scan list.
Because of my location and equipment I can monitor it. Even had an incident where I was called by dispatch because a unit couldn't hear a unit and was very broken getting into the repeater but he could hear the repeater. I did a "poor man" phone patch, (Phone on speaker near the scanner so they could hear what the unit was saying).
So there are times where it is helpful.
I have all the inputs (analog) programmed in, just skipped in the scan list.
CrabbyMilton
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- Jul 28, 2008
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I like to program the mobile( TX) on some systems. I set up a separate list just for those. That way I can scan those while watching TV and if something is going on nearby, you can pick it up. The airport ops and police uses the Milwaukee County OASIS so those come in handy where I can add the tower and ground frequencies and only have to listen to one list.
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