On Apr 3, 6:59 am, "Telstar Electronics"
wrote:
On Apr 2, 6:27 am, "Telstar Electronics"
wrote:

Yesterday, someone brought me a radio to install one of my VoiceMax
beta-test units. I fired up the radio before the installation... and
noticed that the speaker made an annoying loud pop sound when the
signal fell under the squelch. This is the second unit I have noticed
this on. Anyone know what is causing this? Sounds like a big DC pulse
when the squelch kicks in. I haven't had time to look at this issue
with a scope. Anybody else experience this? Any fixes?

www.telstar-electronics.com

I've identified the problem. It seems that the squelch transistion on
this model is on the order of 500uS. That is unecessarily fast and
causes a fast spike to the speaker when the receiver dips under the
squelch. I need to slow the squelch response time to eliminate this
problem. This shouldn't be a big deal... but I ran out of time last
night. I will be posting a fix for this issue in a day or so. Shame on
Cobra for allowing this annoying problem to get into production.

www.telstar-electronics.com

The fix for this problem is to add a 100UF/6.3V capacitor from the
base of QR1 to ground.

www.telstar-electronics.com