This makes no sense: /Half Duplex Radios// //Half duplex radios will require the use of a second node which has had the transmit level properly set, and is not transmitting a CTCSS tone. The second node must be receivable by your service monitor or deviation meter but does not need to be co-located with the node undergoing the receive level adjustment. The CODEC used to send audio to the second node must either be uLAW or ADPCM. The GSM codec will give inaccurate results./ // 1. /Using the Asterisk CLI, connect the node to be adjusted to the transmit node: //|rpt fun yournodenum *3txnodenum|/ 2. /Monitor the deviation of the second node's transmitter on the service monitor while simultaneously injecting a 1KHz tone at 3KHz on the receiver on the first node. / 3. /Adjust the receive level pot until you see 3KHz of deviation on the transmit frequency. / 4. /Disable the signal on the receiver. The receive audio level is now set. / 5. /Disconnect the receive node from the transmitter: //|rpt fun yournodenum *1txnodenum|/ Why use another node to set levels on a simplex node? I use this procedure for simplex and duplex nodes. Works perfectly: *Adjusting Audio Levels This howto describes how to properly set audio levels on an ACID system interfaced to a radio. Required Equipment Communications service monitor, or deviation meter and FM signal generator. Preliminary Checks Modify the config files for the type of radios you have (repeater or halfduplex) and the type of carrier detection you want to do. Make sure your radio is connected to the USB interface and turned on before proceeding. Procedure From the Asterisk CLI, (to get into the Asterisk CLI, type asterisk r from a root shell) set the receiver noise baseline (with no signal on the receiver frequency) as follows: radio tune rxnoise Set the receive audio input level by suppling an FM signal at 1KHz with 3KHz of deviation (with no CTCSS) on the receiver's frequency. then once the signal is present, type: radio tune rxvoice Set the CTCSS tone level by supplying a CTCSS tone at 600Hz deviation your desired frequency (with no other modulation), and type: radio tune rxtone Save the receiver levels by typing: radio tune save Set the CTCSS tone level to zero by typing: radio tune txtone 0 To set the transmit audio level, monitor the transmitter with a deviation meter and start with the setting of 500 (which is the midpoint) by typing: radio tune txvoice 500 This will cause the transmitter to be keyed, and a brief tone be sent so that you can measure the transmit audio level with your deviation meter or service monitor. The last parameter is an audio level setting with a range of 000 to 999. Set the number to that which gives you 3KHz of deviation. Repeat the radio tune txvoice command using different numbers (successive approximation) until you get the desired 3 KHz of deviation. Set the TX CTCSS tone level by typing the following: radio tune txtone 500 This will cause the transmitter to be keyed, and a brief CTCSS tone be sent so that you can measure the TX CTCSS level with your deviation meter or service monitor. The last parameter is a TXCTCSS level setting with a range of 000 to 999. Set the number to that which gives you 0.6 KHz of deviation. Repeat the radio tune command using different numbers until you get the desired 0.6 KHz of deviation. Save the settings by typing radio tune save You may now test the setup to see if the audio levels are acceptable.* 73 Jim W7RY On 10/20/2013 8:54 PM, Tim Sawyer wrote:

Try this one http://ohnosec.org/drupal/node/28 -- Tim :wq

On Oct 20, 2013, at 8:34 PM, Doug Crompton <doug@crompton.com <mailto:doug@crompton.com>> wrote:

...

The following link is no longer valid. Does anyone have a replacement link for this info?

Apparently theqrvc.com <http://qrvc.com>domain no longer exists.

For a guide on setting up and configuring Asterisk, app_rpt, and chan_usbradio.c please see http://apprpt.qrvc.com/usbradio.pdf

*73 Doug WA3DSP http://www.crompton.com/hamradio* _______________________________________________ App_rpt-users mailing list App_rpt-users@ohnosec.org <mailto:App_rpt-users@ohnosec.org> http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users

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