tealc_07
Member
I have several frequencies that I don't know the TX frequency for, is there any way to add those or get the radio to scan without having that?
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RX/TX Frequency Issue
- Thread starter tealc_07
- Start date
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ecps92
Member
For a scanner you only need the output of the Repeater [if there is one]
You don't neee the input frequencies.
You don't neee the input frequencies.
tealc_07
Member
It's an Icom IC-F121 VHF
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Look at the license for that particular frequency and listen in to the other frequencies when the RX is active. It takes some detective work but it's an easy way.
Look at the license for that particular frequency and listen in to the other frequencies when the RX is active. It takes some detective work but it's an easy way.
Duster40
Member
This radio will only scan channels that are programmed into the scan list.
It was not engineered to scan a range of frequencies, looking for
an unknown frequency that is in use. Sorry.
( and I love my F-121 )
tealc_07
Member
I'm trying to use it as a full mobile, so I would need the TX frequency. We found a different frequency on the FCC website, the frequency in our scanners is 463... the one we found on the website is 468... would the higher number be the TX or is there a way to figure that out?
UPDATE:
We found the frequency, apparently the frequency is a UHF... so a no-go on the Icom 121
UPDATE:
We found the frequency, apparently the frequency is a UHF... so a no-go on the Icom 121
Last edited:
Duster40
Member
In the UHF band, it would be common for the frequencies transmitted from the base to the mobiles
to be in the 463.000 range, & the frequencies that the mobile would transmit back to the base to be
in the 468.000 range......UHF repeater frequencies usually have that 5 KC offset.
BUT........if you are trying to program an Icom F-121, that is a VHF radio, not a UHF radio.
The F-121 works in the 150.000 range only. For UHF service, you need a F-221.
However, the CS-100 software programming package works for both radios.
to be in the 463.000 range, & the frequencies that the mobile would transmit back to the base to be
in the 468.000 range......UHF repeater frequencies usually have that 5 KC offset.
BUT........if you are trying to program an Icom F-121, that is a VHF radio, not a UHF radio.
The F-121 works in the 150.000 range only. For UHF service, you need a F-221.
However, the CS-100 software programming package works for both radios.
fineshot1
Member
Sorry but in the interest of correctness I gotta correct you.
You mean +5Mhz TX offset.
In the 450-470Mhz range the standard TX offset is +5Mhz from the repeater output.
Above 470 the standard TX offset is +3Mhz from the repeater output.
Duster40
Member
Yep...senile moment...thanks.
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