From Carc-wiki

Contents 1 Repeater Information 1.1 Standard Offsets 2 Voice Repeaters 2.1 2m Repeaters 2.2 70cm Repeaters 3 APRS infrastructure 3.1 Internet Gateways and public servers 3.2 digipeaters 3.3 Traditional Packet 3.4 Repeater etiquette 4 Scannists

Repeater Information

Standard Offsets

• Traditionally, repeaters are named for their output frequency.
• Unless noted in a repeaters listing, the following standard offsets apply.

Standard Repeater Offsets

Output Mhz	Direction	Offset Mhz
51 - 52	Neg	0.5
52 - 54	Neg	1.0
144.51 - 144.89	Pos	0.6
145.11 - 145.49	Neg	0.6
146.0 - 146.39	Pos	0.6
146.61 - 147.0	Neg	0.6
147.0 - 147.39	Pos	0.6
147.6 - 147.99	Neg	0.6
440 - 445	Pos	5.0
445 - 450	Neg	5.0

• Taking the published output of 146.940Mhz and the standard offset indicated, that repeater's input frequency is 146.340Mhz.
  

Voice Repeaters

All repeaters listed are 'open' to all licensed operators.

2m Repeaters

1. 146.940 123.0hz tone - W7VNJ
   • Wider area (regional) repeater on Casper Mnt.
   • Coverage information
2. 145.235 100hz tone - W7VNJ
   • Local area (metro) at the W7VNJ tower site.
   • Coverage information
3. 146.640 173.8hz tone - KD7AGA
   • Echolink repeater on Casper Mnt.
4. 146.910 100.0hz tone - ??
   • Douglass group repeater - has a 70cm link to Wheatland(?).

70cm Repeaters

1. 449.900 88.5hz tone - KD7AGA - Located at the W7VNJ tower site
   • 10 meter remote base on 29.60 Mhz
   • 6 meter remote base on 52.545Mhz
2. 449.575 173.8hz tone - KD7AGA
3. 449.500 100.0hz tone - NB7I

APRS infrastructure

All APRS traffic is on 144.390 - Unconnected Information (UI) frames, AX.25. Traditional paths using RELAY,WIDE or WIDEn-n and newer WIDEn-n only paths will work. TRACE and TRACEn-n are also supported. Please keep your paths reasonable. 2 or 3 hops is usually sufficient.

• Suggested paths:
  • Mobiles: WIDE3-3
  • Fixed Stations: WIDE2-2

Excessive paths (such as WIDE7-7, etc) will often land you on a digipeater's 'LID List' - blocked out of that digipeater to try and avoid creating a packet floods in neighboring areas.

Internet Gateways and public servers

1. KC7ZRU-15 - Casper I-gate, West side
   1. aprsdCSP - A rocky mnt. regional server - full APRS-IS feed
2. KE7AZF-1 - I-gate, East side (occasional, fill-in and backup)

digipeaters

1. KD7AGA-5 - Copper Mnt digi
2. KD7AGA-6 - Casper Mnt digi
3. KD7AGA-7 - Douglass, WY digi

Traditional Packet

I know of no connected mode amateur AX.25 activity in Wyoming.

Repeater etiquette

A very basic primer on how to not embarrass yourself - too badly - on the "local repeater".

Scannists

Here's an old list (late 1990s) of VHF frequencies of interest in the Casper area.

• At the time this list was made, frequencies indicated with an asterisk (*) were known active.

Note: Many Casper area Public Service departments are now using an 800Mhz digital system.
See this article on Project 25 for background.
However, Law Enforcement, and others, are also digitally encrypted.
Radios/scanners are on the market that will allow you to listen to 800mhz digital systems. 
But, to date, we know of no way to decrypt transmissions in real time.