Atikokan Amateur Radio Club

Serving amateur radio operators and
providing emergency communications for Atikokan and area


All material copyright © Atikokan Amateur Radio Club
E-mail: VE3RIB@shaw.ca
Snail mail: P.O. Box 2106, Atikokan, Ontario P0T 1C0

Home Stations CanWarn Club Stuff Technical


VE3RIB repeater
Atikokan, ON
147.120 +

VE3RIB-1 digi
Atikokan, ON
144.390 (APRS)


VE3RIB-2 digi
Flanders, ON
144.390 (APRS)


VA3EOA station
Atikokan EOC

VE3YIB station
Atikokan Airport

Broadband HAMnet

IRLP Links and Notes

The following is a random assortment of IRLP-related links, mostly geared to setup and installation.

“Skipping” audio on Linksys WRT routers

Now and then, someone reports having incoming audio that misses syllables, or "skips". If this happens to you and you don't think it's packet loss, are you running a Linksys router? The Linksys router has been shown to cause this problem when "Logging" is turned on. Log into your router and check under the Administration tab, sub-title Log (on the WRT54G), and be sure logging is disabled. It might be located somewhere else on a different model router. This has fixed the problem for alot of people. I've tried it both ways on my WRT54G, and haven't had a problem. Just something else to try.

Fixing AuMix issues

Make adjustments when you're SURE "readinput" is not detecting DTMF... or thinks it does (parallel port set wrong, in a hurry to set levels, and forget to get DTMF working first).

If aumix has saved "odd" stuff or is behaving inappropriately:

Make sure you're not connected to another node or reflector.

As root:

killall dtmf

aumix (and set levels where they should be)

Save the aumix settings

/home/irlp/custom/rc.irlp - restart node

Usually clears it all right up. But you have to make sure DTMF is working properly first and that you're not connected anywhere when you do this.

Nate WY0X

IRLP full duplex operation

How do you control your node while the other side is talking? If it's a simplex node, you can't, except via a terminal. Why would you want to? What if someone connects to your node and starts abusing it? What if you want to stop the playback of long bulletins after they've started playing?

The node ignores DTMF unless the COS is active. By default, on a version 3 board, there's a jumper that blocks the COS signal while the PTT is activated. By moving the jumper, you enable the COS signal to be passed to the IRLP software, even while PTT is keyed. This allows a full duplex radio (i.e. a repeater) to pass commands to the software. The jumper is labeled PTT LCKOUT (not a typo). Just move it from one end of the 3-pin header to the other end. If you have a version 2 board, just clip the only diode on the board.

From the archives:

Full duplex control is already optional. Just move the "PTT Lockout" jumper on the interface card. All nodes directly connected to repeater controllers or with full duplex RF links should be set this way so you can send control commands into the node while it is transmitting. Extremely handy for disconnecting from busy reflectors or locked up nodes