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I can’t claim to “know” what it is, but this tidbit from the FT5DR Advance manual seems to describe it: User Programmed Reverse CTCSS Decoder The tone signal frequency can be set at 100 Hz intervals between 300 Hz and 3000 Hz to mute the audio when receiving a signal containing a CTCSS tone matching the programmed tone. 1. Press the [F MENU] key[SQTYP]. 2. Rotate the DIAL knob to select “PR FREQ”. 3. Press the PTT switch to save the setting and return to normal operation. 4. Press the [F MENU] key[CODE]. The setting screen containing the CTCSS tone frequencies is displayed. 5. Rotate the DIAL knob to select the desired CTCSS tone frequency. 300Hz to 3000Hz (100Hz steps) 6. Press the PTT switch to save the setting and return to normal operation. So, a person could assign different PR Frequencies to different radios and then selectively block the audio when receiving a signal from a radio that sends the same PR Frequency. Maybe for blocking audio from APRS or digital transmissions on an analog radio? 1600 Hz is the default.

While I was traveling back from a car club driving tour outing up in the San Jacinto Mountains to the Resort where my car club is holding a week long National Convention, I came upon a multi-car traffic collision with the road almost completely blocked in a blinding curve, on State Route 74, between Palm Desert and Idyllwild, and I noticed several people trying to use their cellular telephone probably trying to report the collision. I assumed they were not having any success because we were in a cellular dead zone which was several miles long. I did not stop to check on injuries because there was no safe place to pullover since it was a narrow mountain road with essentially no shoulders. I continued on hoping to see some bars on my cell phone. Fortunately, I had both my portable and mobile GMRS units with me and I attempted to make contact with another station that could relay the incident to the California Highway Patrol. I knew there were two repeaters in the area so I tried Coachella Valley Repeater and called out in the blind asking if any station would relay the incident to the CHP. A station in the Salton City Area answered up and relayed the incident and came back to tell me he was successful in making contact with the CHP. I signed off and continued my drive back to La Quinta It pays to have a GMRS Radio as an additional means of communications to report emergencies to public safety agencies. Also, it pays to be prepared and know the GMRS system in the area you are traveling in and have your radio units programmed accordingly just in case. This was the “just in case”.

I took another trip from CA to TX. My wife was with me this time so I didn't geek out as much as I usually do. I had programmed all the GMRS repeaters along the route into my KG-935G+ as well as all of the 2m repeaters. I had my Yaesu VX-6R with me as well. My route avoided most large cities. I scanned all of the GMRS repeater and simplex frequencies, along with 2m, 70cm repeaters and call freqs. I heard a little 2m and GMRS repeater traffic in the CA central valley and then didn't hear anything until KIngman, AZ. I heard 2m traffic there. There was a little GMRS/FRS traffic in Flagstaff. I didn't hear anything else until I got to Central TX. I was on FM roads so that is no surprise. My destination was Beaumont, TX, where my youngest daughter lives. There was quite a bit of 2m traffic there as well as a GMRS repeater in the Beaumont area owned and operated by a GMRS club. I had joined the club last year to get access to their repeaters. One reason I like the 935G is I can listen to railroad frequencies. My path half way across the country was along major rail lines. So I had one radio just scanning those frequencies all the time. I heard a lot of train stuff which I enjoyed. It is interesting to hear a train crew talking to a dispatcher in the middle of the Mojave desert. On the way back I-40 in Flagstaff was funneled to one lane and the traffic was stopped. I called out on a 2m repeater and a GMRS repeater and got no response. I heard a couple of people talking on GMRS and talked to them and it turns out the were using FRS radios in a campground. It was a good trip. The addition of scanning RR frequencies was fun. My wife even got to the point that when she heard the EOT (end of train) signal she would start looking for the train. Enjoy your radios, they can make roads trips more fun even if you don't talk to anyone.

Or at least don’t publicly admit to doing so.

It's unlikely that anyone ever will. Great radio though.

You might want a radio approved for GMRS as you would likely find it easier to program and less easy to go sideways. That's your call. That said their is a +5 offset for repeaters on the TX. If you are in fact talking simplex this may be why. For instance channel 15 is 462.5500. So for a repeater on the same channel/frequency, the TX to a repeater will be 467.5500 and RX will be at 462.5500. A GMRS radio will likely already have the offset programmed in.

I have not run into that at all, been talking FM with a few folks here all weak.

I went to radioreference dot com and searched for railroad. There are several hundred frequencies that I programmed into my radio. I don't know which are in use where so I made a scan group for railroad.

I'm in the same antenna boat... have the NA-771G and it just doesn't do the trick inside. I'm looking into 1) trying to get an OK from the HOA for an antenna; or 2) get an antenna up in the attic. Both Antenna Medix and Mr. Antenna have indicated they can do this. I'm trying to learn enough to sharpen my BS detector.

Then, I don’t know. Might have to ask John Kruk.

You used cb 10 codes. That's different from the ham radio q codes. You don't wanna sound like a cber. Sent from my SM-A136U using Tapatalk

You're not licensed to use it. You know that for a fact? Did you go there and ask them to be sure? This is how it usually starts. The typical excuses: "I'm not hurting anyone" "I'm not interfering with anything" "Nobody uses the frequency anyway" "The FCC doesn't care" and so it goes. Why bother with rules when people ignore them anyway? That's how the CB 11M band ended up the mess it became in the late 70's and early 80's. And that's not talking about the freebanders above 27.405MHz. Hams can tell you all about the illegals operating on the lower end of the CW section of the 10M band.

If a nearby C4FM radio also has Group Monitor turned on with the same group ID, it’s possible to have a simplex conversation directly between the two radios. If you connect through a repeater you do tie up repeater resources.

@Sshannon I tried that method too. No luck. It doesn't mute or unmute when the tone is present. Mine defaulted to 300, but i tried several times and none of the selected tones worked.