back4more70 Posted September 28, 2023 Report Share Posted September 28, 2023 Hypothetical question: If I run two separate radios in my car (2m and 70cm) with two separate antennas on the roof, would this setup be a problem i.e. overloading or desensing? The antennas would have to be less than four feet apart due to the roof size. Quote Link to comment Share on other sites More sharing options...
kidphc Posted September 28, 2023 Report Share Posted September 28, 2023 Shouldn't be a problem. (Big shouldnt).Remeber, 70cm is third harmonic ( I think) of 2m. So best practices would be shut one down when in use.My xtl 5k will overload my ftm400 when transmitting on occasion. But that is when the frm400 is listening to 70cm, the xtl5k is used for gmrs. It's to be expected at 4.5 feet between the antennas, especially since 70cm and gmrs are so close in frequency. I haven't seen issue on the 2m side when transmitting on gmrs.I say if, since Marc had problems with his 2m xtl 5k, that one he thinks it might have been the gmrs xtl5k, that damaged it. Hopefully, he can chime in with his real world findings.But if you are really worried. Run some cheap filters.Sent from my SM-S901U using Tapatalk back4more70 1 Quote Link to comment Share on other sites More sharing options...
gortex2 Posted September 29, 2023 Report Share Posted September 29, 2023 I have 6 NMO mounts on the roof of my F150 (crew cab). All are hooked up to APX mobile radios. I see no noticeable issues. Really will depend on power and quality of radio. Cheap radios and high power don't go well together. PACNWComms, WRXB215 and back4more70 3 Quote Link to comment Share on other sites More sharing options...
nokones Posted October 7, 2023 Report Share Posted October 7, 2023 Ditto! My XTL5000 base radio and my Repeater Station also are not bothered by my other same proximity radios transmitting when receiving. That is not the case with the other same proximity radios receiving and the XTL5000 radios and/or repeater station transmitting. Quote Link to comment Share on other sites More sharing options...
marcspaz Posted October 7, 2023 Report Share Posted October 7, 2023 I have an FTM-300DR, which has the ability to run 2m and 70cm at the exact same time using the same antenna and there is no desense issues. It's mostly going to depend on the frequencies in use and the filters on the radios. gortex2, WRUU653 and Sshannon 3 Quote Link to comment Share on other sites More sharing options...
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