at KG4FZR MCARC Club Shack
The McMinn County Amateur Radio
Club, Inc., through it's KG4FZR Club Shack located at Athens
has a full VHF digital station in operation 24/7.
The station operates on the following frequencies in the
simplex / APRS
KG4FZR-7 operates on 144.390 simplex as a full service APRS
TNn-N digipeater and local Igate.
The digipeater responds to WIDEn-N. No where in this area does
APRS station of any kind need to have a path greater than
Suggested paths for base stations are WIDE2-2. Suggested paths
mobiles are WIDE1-1,WIDE2-2 or less.
It also responds to TNn-N, or commonly called "SSn-N" where
"SS" is the
2 letter state abbreviation and the "n" is a number, and
stations using TNn-N up to TN7-7. This effectively keeps APRS
within the state of Tennessee. Not all digi's respond to this.
KG4FZR-7 is also a two way APRS Internet
Gateway, or "Igate". It
"gates" all traffic it hears to the Internet, unless the
includes "RFONLY" or "NOGATE" in it. Stations with those
their paths are not gated.
It also gates messages for "local" stations that are nearby
from the Internet to the RF side of APRS. The stations
are stations that have been heard by KG4FZR-7 directly, and
a digipeater. KG4FZR-7 gates this type of traffic with an
path, i.e. the traffic DOES NOT go through any digipeater.
similar in fashion to a "remote base" operation.
KG4FZR-7 Igate is also setup to gate "local" Internet only
stations beacons, messages, and objects from the Internet to
an "RFONLY" path, i.e. the traffic DOES NOT go through any
"Local" stations are those that are in the McMinn County
area, and are not being gated by any other Igate, to our
KG4FZR-7 Igate also gates weather objects and messages that
from the Morristown, TN National Weather Service office, and
Prediction Center. This traffic is gated to RF the same as
traffic, so that stations participating in SKYWARN have a
of receiving this data, and seeing it visually on their
If you are in the McMinn County
are setting up an Internet
only APRS station, and would like to be added to the
KG4FZR-7 APRS Digi
/ Igate, send an email to email@example.com
and tell us your setup, call sign, name, location, and phone
will look at the situation, and if you meet the criteria for
will add you to the allowed list in the Igate. The criteria
we use is
based on data provided by APRS server sys ops and software
suggestions widely known across the US for such practices.
station is added to the KG4FZR-7 Igate, your station will
local stations with one RF hop from KG4FZR-7, but will not
any digipeaters. This is standard practice for Igates.
The APRS system runs on one radio tuned to 144.390 simplex,
KISS mode TNC, and a computer running Windows XPSP2 and
Please view our other APRS
resources at http://www.mcminnarc.com
and click on "APRS".
simplex Packet Radio
The club shack operates on 145.550 simplex in Packet radio
mode at 1200
KG4FZR-1 is a local packet mailbox. It DOES NOT allow you to
messages to anyone other than those who log in to KG4FZR-1
their mail. Stations in the area who use packet, but do not
personal mailbox may feel free to use the KG4FZR-1 mailbox.
NOTE: PLEASE DO NOT
TO KG4FZR THROUGH KG4FZR-1. USE KG4FZR-10 WL2K INSTEAD.
KG4FZR-10 is a full featured Winlink (WL2K) RMS Packet
allows you to send a message to any address registered on
WL2K, be it
ham, MARS, or tactical, and also to internet email
MCARC is the "alias" of the packet digipeater at the
KG4FZR-7 is the call of the local packet node.
All four of the above functions are done with one radio on
Kantronics KPC3, and a computer running Windows XPSP2 and
All the packet functions and APRS functions use the same
computer "boots on LAN" after power failures, and reboots
every day to clear the memory. There is a standby generator
City Hall, and it feeds the club shack. Other that equipment
the only time the systems should be down is only a few
on generator start up.
The City of Athens graciously provides us with an internet
which allows us to run the APRS Igate and the Winlink RMS
The club call KG4FZR is managed by trustee Bob Miller,
KG4FZR, who is
the retired City of Athens Fire Chief, and also overseen by
Ziegler, KI4ETT, current City of Athens Police Chief. Scott
NA4IT, is the sysop and keeps a watchful eye on the system
remote access via the internet, and by 24/7 monitoring the
RF with his
own APRS and Packet stations.
The radios for APRS & packet are fed into a repeater
duplexer, and the on to a single antenna.
Additional info on packet mode can be found at http://www.mcminnarc.com/packet/packet.html.