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avproman

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  1. Here is the FCC GMRS spec for Bandwidth: §95.1773 GMRS authorized bandwidths.Each GMRS transmitter type must be designed such that the occupied bandwidth does not exceed the authorized bandwidth for the channels used. Operation of GMRS stations must also be in compliance with these requirements. (a) Main channels. The authorized bandwidth is 20 kHz for GMRS transmitters operating on any of the 462 MHz main channels (see §95.1763(a)) or any of the 467 MHz main channels (see §95.1763©). ( Interstitial channels. The authorized bandwidth is 20 kHz for GMRS transmitters operating on any of the 462 MHz interstitial channels (see §95.1763() and is 12.5 kHz for GMRS transmitters operating on any of the 467 MHz interstitial channels (see §95.1763(d)). GMRS radios are Part 95 and as such have a 20 kHz separation. Channels 8 - 14 are the half watt 467 MHz interstitial channels which are not available on the RA25. Even though 12.5 kHz is displayed on the GMRS Codeplug, clicking on it does nothing. Of course, since I don't have the radio yet to use, I can only speculate how the software and settings work.
  2. In the GMRS version it wouldn't matter what step was listed because it would only be used in the VHF/UHF version. The steps would determine the change in frequency as you use the UP/Down button on the Mic keypad. Channel Spacing would be either 12.5K or 25K.
  3. I have also ordered one of the RA25 units along with the programming cable. Retevis said it would take 4-5 weeks to get to me under regular shipping. I have been playing around with the software and here is what I have noticed: After extracting the files, you get 2 default files along with the program itself. One default file is for the VHF/UHF version of the radio the other is for the GMRS version A9198A-RA25-Codeplug-210116.dat A9198B-GMRS-Codeplug-210116.dat Loading the VHF/UHF version, you can enter the frequencies you want. Loading the GRMS version, the GRMS frequencies are already entered and you cannot change them. You can add a channel name, the CTCSS/DCS codes and most other options, but not the frequencies. Also the FRS only channels (8 - 14) are not listed. ScreenShot 1 shows the VHF/UHF version. Double clicking the” MORE >>” on a CH number will bring up the Channel Edit window. When you type in a frequency, you will be able to edit all the info in this window. ScreenShot 2 show the GMRS version. ScreenShot 3 has the Channel Edit window. Notice that the Frequencies are already there and are grayed out. As far as VFO, in the GMRS version you can't add frequencies. The CTCSS/DCS codes in the GMRS version are the same in any other Retevis GMRS radio. I have been using RT76 portables from Retevis and did change the codes for my situation, but if you are using the radios in Simplex mode, it's “out of the box” communications. Once I get the RA25, I will do an update to the forum. ,,
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