MaxC78 Posted September 22 Report Share Posted September 22 If there is no offset listed for a 70m repeater that's local to me, should I assume its 5.000? What about 2m? How do I know if its up or down? Still new to this stuff, TIA Quote Link to comment Share on other sites More sharing options...
Socalgmrs Posted September 22 Report Share Posted September 22 Since this is a ah question and this is a gmrs forum you may find more and better answers in a ham forum. Quote Link to comment Share on other sites More sharing options...
SteveShannon Posted September 22 Report Share Posted September 22 8 minutes ago, MaxC78 said: If there is no offset listed for a 70m repeater that's local to me, should I assume its 5.000? What about 2m? How do I know if its up or down? Still new to this stuff, TIA There are standard offsets. Many radios are programmed to automatically use them. Yaesu calls their Automatic Repeater Shift. For 2 meters the shift is 0.600 MHz. For 70 cm it’s 5.000 MHz. For 220 MHz it’s 1.25 MHz. For me anyway the question is whether the shift is positive or negative. I don’t know if there’s a convention that specifies that. But usually the information for a repeater will include either a plus or minus sign near the receiving frequency. AdmiralCochrane, WRXB215, WRUU653 and 1 other 3 1 Quote Link to comment Share on other sites More sharing options...
WRUU653 Posted September 23 Report Share Posted September 23 I would add many radios and software will add the appropriate shift for the frequency. As@SteveShannon mentioned look for a + or - sign though. SteveShannon and TrikeRadio 2 Quote Link to comment Share on other sites More sharing options...
MaxC78 Posted October 8 Author Report Share Posted October 8 On 9/22/2024 at 5:57 PM, SteveShannon said: There are standard offsets. Many radios are programmed to automatically use them. Yaesu calls their Automatic Repeater Shift. For 2 meters the shift is 0.600 MHz. For 70 cm it’s 5.000 MHz. For 220 MHz it’s 1.25 MHz. For me anyway the question is whether the shift is positive or negative. I don’t know if there’s a convention that specifies that. But usually the information for a repeater will include either a plus or minus sign near the receiving frequency. Gotcha! I attached a local repeater frequency from the mygmrs map. No plus or minus? Seem like most of them locally don't say which way the offset is. I am missing something? Or does TX and RX happen on same freq? I am using a UV-5RM and manually programming the repeaters in with Chirp. Quote Link to comment Share on other sites More sharing options...
CaptainSarcastic Posted October 8 Report Share Posted October 8 29 minutes ago, MaxC78 said: Gotcha! I attached a local repeater frequency from the mygmrs map. No plus or minus? Seem like most of them locally don't say which way the offset is. I am missing something? Or does TX and RX happen on same freq? I am using a UV-5RM and manually programming the repeaters in with Chirp. That's because on GMRS the offset is ALWAYS 5mhz higher (+) So every repeater transmitting on 462.600 will be listening on 467.600 AdmiralCochrane, SteveShannon and WRXB215 3 Quote Link to comment Share on other sites More sharing options...
Socalgmrs Posted October 8 Report Share Posted October 8 Yup. If you h e a gmrs radio the repeater channels are already set up. If you’re doing a diy channels it’s always going to be +5.00. If it’s anything else it’s not a gmrs repeater TrikeRadio 1 Quote Link to comment Share on other sites More sharing options...
nokones Posted October 8 Report Share Posted October 8 For 450-470 MHz UHF freqs, it's is mandatory 5 Meg off-set and dedicated freq pairs with the higher freq of the pair being the mobile transmit uplink input to the repeater. UHF freqs above 470 Megs is only a 3 Meg off-set and with the respective dedicated freq pairs. As for the HAM 70cm freqs, I don't know if it is FCC regulated or not insofar as what the off-set is and if the mobile off-set is a plus or minus and if the freq pairs are dedicated pairs. That is a whole different universe. Quote Link to comment Share on other sites More sharing options...
WRYZ926 Posted October 8 Report Share Posted October 8 29 minutes ago, nokones said: As for the HAM 70cm freqs, I don't know if it is FCC regulated or not insofar as what the off-set is and if the mobile off-set is a plus or minus and if the freq pairs are dedicated pairs. That is a whole different universe. I have not seen a negative offset on 70cm repeaters. But that is not to say that negative offsets are not used on that band. I know a few of the 2m repeaters in my area do use a negative offset. As mentioned, all 70cm and GMRS repeaters use a 5.000 offset. Quote Link to comment Share on other sites More sharing options...
WRXB215 Posted October 8 Report Share Posted October 8 Yes, 2m has both positive and negative and I have only ever seen 600kHz instead of 5MHz. Quote Link to comment Share on other sites More sharing options...
BoxCar Posted October 8 Report Share Posted October 8 5 hours ago, WRYZ926 said: I have not seen a negative offset on 70cm repeaters. But that is not to say that negative offsets are not used on that band. I know a few of the 2m repeaters in my area do use a negative offset. As mentioned, all 70cm and GMRS repeaters use a 5.000 offset. There are a few having a negative offset in the Carolinas where the repeater's input is at the upper portions of the amateur band. Quote Link to comment Share on other sites More sharing options...
WRYZ926 Posted October 8 Report Share Posted October 8 13 minutes ago, BoxCar said: There are a few having a negative offset in the Carolinas where the repeater's input is at the upper portions of the amateur band. I wasn't for sure about that on 70cm repeaters, It is common on 2m repeaters around me. Quote Link to comment Share on other sites More sharing options...
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