Digital Learning Net
Digital Learning Net

Join W0SUN and KE0DC Wednesday nights at 1900 Mountain Time to discuss all things digital.


CRRG runs its own XLX server connecting digital modes.  With full transcoding support D-Star, DMR and YSF.

Field Day 2025
Field Day 2025

Are you preparing for Field Day 2025? It’s never too early to start! Be field ready for anything.

APRS Messaging
APRS Messaging

Are you using APRS?  Have you tried the messaging functionality yet?  It’s intuitive and works worldwide.  If you need help check into the DLN and ask.

The Castle Rock Repeater Group is an amateur radio club based in Denver, Colorado. Originally founded in the 1960s, but organized in its current form in 1993, the CRRG has members throughout the Colorado Front Range and beyond.

We are a non-profit corporation registered with the State of Colorado. We operate three repeaters in the Denver metro area. Please join us for our weekly Sunday evening net at 7:00pm (1900) Mountain Time on our primary repeater at 146.670- MHz with a 100 Hz PL tone.

This is the official new home of Castle Rock Repeater Group. and are former URLs of the club.

Visit us on Facebook at Castle Rock Repeater Group or join us on Telegram.

News Around CRRG

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The Digital Learning Net is looking for Net Control...
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Acceptable Use Policy

CRRG has finalized an Acceptable Use Policy for its...
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Free Testing!

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Field Day 2025

June 26th – 29th 2025

Where is it?

Please Register for a stay as soon as possible at:

Denver East / Strasburg KOA Holiday
1312 Monroe Street
Strasburg , CO 80136


  • June 26th Thursday
    Arrive and get settled in, hit the pool?
  • June 27th Friday
    1200 – Setup for Field Day can begin
    1800 – Burgers at the Main Cabin, meet and greet.
  • June 28th Saturday
    1200 – Field Day operating begins
    1600 – 1800 – BBQ Dinner
    1830 – Night Operating Begins
  • June 29th Sunday
    0700 – 0900 – Breakfast & Exit Meeting
    1100 – Checkout
    1200 – Field Day Operations Stop

What is this event about?

Every year Colorado Amateur Radio or Ham Radio people go out and setup radios they have prepared to work in the field. It is always the last weekend of June so this year CARBBN and Colorado Ready are teaming up for a Preparedness Field Day event. Meaning that if you want to camp and test your outdoor preparedness along with learn something about basic Medical preparedness please join us.

What is Amateur Radio?

Often called “ham radio,” the Amateur Radio Service has been around for a century. In that time, it’s grown into a worldwide community of licensed operators using the airwaves with every conceivable means of communications technology. Its people range in age from youngsters to grandparents. Even rocket scientists and a rock star or two are in the ham ranks. Most, however, are just normal folks like you and me who enjoy learning and being able to transmit voice, data and pictures through the air to unusual places, both near and far, without depending on commercial systems.

Communications Plan

On-Site Communications
FM Simplex: 446.250MHz
C4FM GM: 145.5625MHz DG-ID:0

APRS Messaging: 144.390MHz (KE0NVB, AC0XW-9 and KE0DC-7 will be monitored)
Meshtastic: (keys provided on-site)

Digital Learning Net

Join KE0DC and W0SUN for the Digital Learning Net.
It’s held on the “DMR 31088 COLORADO-HD” or Reflector XLX303 Module D
Wednesdays at 7:00pm MDT .
The Digital Learning Net is usually about 1.5 hours.

visit  → for all the details

Immediately following the Net, join us for “HD Happy Hour “ on COLORADO-HD (HD is Hotspot Discussion)