Archive for category Asterisk RF
URI Connection Guide
May 20
The URI Connection Guide (pdf) is available. Included in the URI Connection Guide is information for connecting the URI to Maxon LMR Transceivers (SM2500, SM6000, SD170) and Icom LMR Transceivers (F121/221) . Additional radios will be added as needed.
This is a interface for the Asterisk app_rpt radio control.
URI – USB Radio Interface
Asterisk app_rpt via USB
Sep 17
A new low-cost way to interface Asterisk app_rpt to radio can now be used with a USB sound adapter. Some modifications are needed to bring out the PTT, block DC on the audio outputs, and attenuate the receive audio to match the microphone levels.
A new low-cost way to interface Asterisk app_rpt to radio can now be used with a USB sound adapter.
Some modifications are needed to bring out the PTT, block DC on the audio outputs, and attenuate the
receive audio to match the microphone levels.
From the qrvc.com web site the following features are mentioned:
chan_usb radio contains all of the interface code to interface app_rpt to a CM108 based USB sound fob.
In addition it contains DSP code to do CTCSS encoding and decoding, squelch, pre-emphasis and soft
limiting, de-emphasis, and audio level adjustments.
Basically, you only need to make 3 or 4 connections to your radio:
- Discriminator audio, de-emphasized audio, or speaker audio.
- Transmit audio (direct to modulator, or microphone)
- PTT
A new doorway is quickly opening to continue the progression of Asterisk as the way to interconnectivity.
For more details about Asterisk app_rpt visit http://app-rpt.qrvc.com/
and information about Asterisk can be found at http://www.asterisk.org
What are FXS & FXO?
Sep 5
What are FXS & FXO?
FXS — Foreign Exchange Station
FXO — Foreign Exchange Office
An FXS device initiates and sends ringing voltage. FXS sends the voltage to an FXO device, which receives it.
The phone receiving the call is the last FXO device in the chain, and when it receives voltage from an FXS device, the phone will ring.
Connect the outside line to an FXO port on your Asterisk server to receive voltage from the outside lines.
Connect the phones to FXS ports on your Asterisk server. When the FXO module in your Asterisk Server receives the voltage, it will then generate voltage using the FXS module and send it to your analog phone.
Hint: Remember the “to”… FXS = FX(to)Station and FXO = FX(to)Office.
With “to” representing the direction taken by the signal.
Support
Jan 24
This is the place to go for support.
