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Transmit offset

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pokey

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Dec 19, 2002
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146
Hello,

Could someone please confirm whether the transmit offset on a 700 mhz trunking system is +35 mhz or +30 mhz?

Thank you.
 

mmckenna

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30MHz, at least it is here in the USA. Not sure where you are located, might be different. If you are running a Motorola radio (or any other name brand), then it should do the offsets for you, automagically.
 

pokey

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Dec 19, 2002
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Thanks for the reply. I am located in Canada and the CPS does not do the offsets for you.
 

pokey

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Dec 19, 2002
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I am, yes. I was under the impression that it was +35 in Canada but just wanted to confirm.
 

GTR8000

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Frankly, it doesn't really matter, as you're not going to be registering/affiliating/transmitting if you set it up correctly. Also, the system broadcasts the appropriate IDEN_UP messages over the control channel anyway for implicit systems, which UHF/700/800/900 almost always are with rare exception.
 

pokey

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Frankly, it doesn't really matter, as you're not going to be registering/affiliating/transmitting if you set it up correctly. Also, the system broadcasts the appropriate IDEN_UP messages over the control channel anyway for implicit systems, which UHF/700/800/900 almost always are with rare exception.
Good to know. Thank you for the reply!
 

chrismol1

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Mar 15, 2008
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Correct, for non-affiliate scan the transmit offset is for transmitting to the system and will receive NAS without the correct tx offset. If you put something else in, and by some stupid reason the talkgroup is selected and without tx inhibit on, it will transmit quick packets whatever that other than correct offset may be and without response from the system the radio will promptly display NO COMMS indicating it receives the control channel but did not receive a "handshake" response from the system. Thats is an old safety measure taken by those concerned for their different programming operation on a radio also with NAS or those concerned enough to do it anyways regardless
 
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