What you are talking about is in usbradio.conf

txtoctype=notone     ; Transmit tone control type: no,phase,notone

                     ; no - CTCSS tone encoding with no hang time

                     ; phase - encode CTCSS and reverse phase

                     ; AKA ("reverse burst") before unkeying TX

                     ; notone - encode CTCSS and stop sending tone before unkeying TX

                     ; AKA ("chicken burst")

I use the “notone” option as you can see.

I find that my Kenwood radio needs about 700 ms of hang time (from rpt.conf) for the CTCSS squelch to close.

If you drop the carrier after that, there is no noise. Before that – and you still  hear some squelch tail.

Ken

KE2N

From: app_rpt-users-bounces@ohnosec.org [mailto:app_rpt-users-bounces@ohnosec.org] On Behalf Of Lu Vencl
Sent: Wednesday, July 13, 2011 11:25 AM
To: bdboyle@bdboyle.com; app_rpt-users@ohnosec.org
Subject: Re: [App_rpt-users] Chicken Burst tweak

Hi Bryan.

Thanks for the reply.

Yes, I adjusted hangtime and all it does is extend the repeater hang time.

As for the reverse burst method,  it works great with radios that support is like Motorola portables.

The problem is that the VX5-R does not support reverse burst.  The repeater is a Motorola repeater, so I pulled the TX PL reed out and got excited about the chicken burst option on the APP_RPT.. But it still gives me squelch burst.. Like I said, I just need another 100 MS (200 to be safe) to make this work..

Is this a parameter that cannot be tweaked?

If not, I can always build an external piece of hardware to add the additional delay on the PTT. I just thought it might be easier to do this in software.

Or I can simply wait for a future APP_RPT release that might have this variable defined to help those with radios that need a little bit more time in the CTCSS timeout sequence.

73

Lu, KA4EPS

From: app_rpt-users-bounces@ohnosec.org [mailto:app_rpt-users-bounces@ohnosec.org] On Behalf Of Bryan D. Boyle
Sent: Wednesday, July 13, 2011 8:12 AM
To: app_rpt-users@ohnosec.org
Subject: Re: [App_rpt-users] Chicken Burst tweak

On 7/13/11 7:02 AM, Lu Vencl wrote:

Looking for the parameter and file (if not in rpt.conf) where I can tweak the length of chicken burst. The current amount is not enough for my VX 5R.. I need another 200 MS to be effective. 

Thanks..

Lu

KA4EPS

Have you gone through and set your timeouts and such in rpt.conf?  Additionally...are you transmitting PL tones?  If you are, and you're not depending on the radio hardware (ie you're doing all the audio processing in Asterisk, and doing direct FM injection), you can try using reversing the phase of the pl before carrier drop to quiet the end user receiver before dropping RF carrier.  Old technique to quiet the receiver before dropping carrier.

Getting all of these to work correctly is a balancing act between what the radio can do, and how that coincides with how Asterisk views the world. 

Just some thoughts.

73 Bryan WB0YLE
Allstar 27294 27295 27673 27710 27774...:)

-- Bryan In this world, you must be oh so smart or oh so pleasant. Well, for years I was smart. I recommend pleasant. You may quote me.