CPU power is only an issue for really flea-sized (raspberry pi) or old-old computers. You can get a $79 computer today that will run 4 URI's with DSP and stream audio to the internet at the same time. As I recall, one of the Motorola radios I played with had the discriminator audio available at the 16 pin socket, but you had to move a jumper inside. I think the two-level squelch in app_rpt is better than some simple rig's hardware squelch, but is probably not better than the hardware squelch in some other radios. So if you are really interested in this, it's a case of try-it-and-see. I am inclined to believe that having un-muted audio must be somehow better - in terms of system latency - since the audio is already "in the pipeline" of the audio processing chain when the decision is made to transmit it (or not). But I have never tried to prove this. Regards Ken
-----Original Message----- From: app_rpt-users-bounces@ohnosec.org [mailto:app_rpt-users- bounces@ohnosec.org] On Behalf Of K&R Yoksh Sent: Saturday, March 30, 2013 12:10 AM To: app_rpt-users@ohnosec.org Subject: Re: [App_rpt-users] Something is rotten in the state of Denmark (Ken)
----- Original Message -----
From: "Ken" To: "'George Csahanin'" Subject: Re: [App_rpt-users] Something is rotten in the state of Denmark
I think this is a case of YMMV ? I find if I enable DSP squelch with the low-noise receiver, the squelch operation on weak signals is somewhat erratic. With strong signals it?s fine.
I'm just reading this thread, so forgive me if I missed something, but can you use COS and filtered, muted audio rather than discriminator audio and DSP?
Personally, I prefer the former, especially when using Motorola 16-pin radios, where all of the signals you need are already at the rear panel. With this configuration, you can use SimpleUSB and lower your CPU usage by not running the DSP routines. I agree that sometimes the weak signal squelch detection isn't as accurate as COS.
73
Kyle K0KN Allstar 2210-2219
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