Q: What is FRS?
A: FRS stands for Family Radio Service and is a low-power 22 channel two-way radio service in the UHF 462/467 MHz range. Shares same frequencies with GMRS.
Q: What is GMRS?
A: GMRS stands for General Mobile Radio Service, and is a medium-power 22 + 8 (repeater) channel two-way radio service in the UHF 462/467 MHz range. Shares same frequencies with FRS.
Q: Is CAVERN Channel 8 or 9, 15, 23 or what?
A: All of the above! CAVERN is heard on 462.550 MHz which is GMRS/FRS Channel 15, however different radios access this channel via different channel locations. CAVERN-programmed RETEVIS RT22 hear.
Q: How do I monitor for emergencies only?
Q: How do I alert people to an emergency?
Q: What constitutes a local emergency?
Q: Does CAVERN own these channels?
Q: Why can’t people hear me?
Come visit our CAVERN table at the Blackberry COBBler event on 24 August 2019. We may have FRS and GMRS radios, and possibly even CAVERN tee shirts available (for a tax-deductible donation to support the project).
CAVERN Radio Checks continue weekly on Wednesdays at 6:30PM all year around — and we’re also now doing a second weekly Radio Check on Saturdays at 1:00PM during fire season (which is roughly June through when the rains arrive around November). Thanks to Larry S, we have a good repeater high over Cobb where a lot of people can reach it by radio. Mel and I are hoping to expand this with two more repeaters once we solve the “tone problem”. If you are a radio nerd and can help us with that, please email me.
Meanwhile, we’re working on some prototypes of the first mesh network nodes. (see photo). They are magnificently crude, but we will be testing them in 2021. If you get a tee shirt, you’ll be signed up to help test a very early prototype of the mesh node.
The first three CAVERN mesh network node prototypes starting to talk to each other in our lead developer’s lab.
PS: get on our CAVERN Announcements list so you get the latest news!
GOTO — lists.CAVERN.mobi
Not everyone wants to listen to a scanner or CAVERN throughout the day…and especially at night. Luckily CAVERN programmed radios can screen out the day–to-day chitchat on the frequency, so that you only hear alerts of local emergencies put out by fellow CAVERN volunteers.
To screen out chitchat set your CAVERN-programmed RETEVIS RT22 to channel 9, or (newer) BTECH GMRS V1 to channel 33. Additionally any FRS/GMRS radio that supports privacy tones can be set to the standard channel 15 with a “privacy tone” or CTCSS receive tone of 103.5 Hz. (Often tone #13 corresponds to 103.5 Hz.) Consult your radio’s manual or send email to Net Control.
NOTE: We test the Emergency Alert channel tone at the beginning of our check-ins or when a Fire siren is tested. But we conduct the actual check-in roll calls on our non-emergency channels! (RT22 Ch 8, GMRS V1 Ch 15 or 23, most FRS/GMRS radio ch.15 with NO privacy tone.) If you modify your radio to hear the Emergency tome, be sure to reset your radio to the regular channel after test or you may not hear anything else!
Should you need to announce an emergency, first listen and ask on the non-emergency channel if the network is already aware of the emergency.
If there is imminent danger to the some part of the Cobb area (as in a moving fire within 1-3 miles likely to require evacuation) put out an emergency alert with as much detail RETEVIS RT22 to Ch 9, or BTECH GMRS V1 to Ch 15 or 23 with CTCSS 103.5 set on transmit. Additionally any FRS/GMRS radio that supports privacy tones can be set to channel 15 with a “privacy” or CTCSS tone corresponding to 103.5 Hz (often named tone #13).