Welcome to the N7TWB Amateur Radio Station.

I operate the N7TWB/R repeater on 447.95(-)MHz in Phoenix, Arizona

This is an open repeater with good coverage of the western part of the Valley.

100 Hz PL tone is required to open the receiver. 100 Hz PL is also transmitted.
The transmitter drops PL before dropping carrier to eliminate squelch tail
for users equipped with PL decoding receivers. The repeater IDs in 20 wpm CW
as N7TWB / RP when tone is enabled (which is basically all the time).
Anti kerchunking is usually enabled, so your initial transmission must be
> 2 seconds if the machine has been idle for a while.

Station equipment is a Motorola Micor UHF Mobile converted to duplex,
an MCC RC-1000 controller, Celwave 638-6 six cavity duplexer,
& Diamond F718A 11.5dBi gain vertical antenna at about 45 feet AGL.

Repeater equipment photos



NOTICE TO USERS:

Temporarily off the air due to transmitter failure.



INTERNET REPEATER LINKING IS ONLINE !

IRLP links together hundreds of repeater systems worldwide
by using the Internet to transmit digital audio.
IRLP nodes are accessible only to licensed amateurs via RF.

I have been assigned IRLP node number 7460.

For more information and a node directory see The IRLP Home Page


SYSTEM STATUS:
On-the-air testing began April 30, 2002.

The node is now fully operational and enabled full time.
Users are encouraged to contact me with operational reports and questions.

The IRLP interface is connected to the remote base port of the repeater controller.
The courtesy tone of the repeater indicates if the remote base is enabled or not:
a two-part (hi-lo) tone means no remote, while a three part tone (hi-lo-hi) means the remote is up.



IRLP Operating Reminders

All licensed amateurs are welcome to use the IRLP system
as long as the following guidelines are kept in mind:

  • Watch your language & be courteous.
  • Identify yourself before controlling the node.
  • Key your transmitter for at least 2 seconds before beginning to speak
    or entering DTMF tones, to give the entire system a chance to come up.
  • Wait for the courtesy tone, plus an extra 2 seconds before
    responding to a transmission; this allows the repeater(s) to cycle.
  • Remember time zone differences if calling overseas nodes.
  • Please drop the link when you are finished.
  • For more operating hints, read the IRLP operations guide



Theoretical repeater coverage map is shown below for a mobile installation.
Of course, buildings & below grade roadways cause local holes.

Repeater coverage map courtesy of VE2DBE's RadioMap software.

E-Mail Me

Bruce Rogers
Phoenix, Arizona USA



Updated 11/03/02