Jim Cicirello wrote:
*Hi Kevin, As always thanks for your help. Can I tell you what I am
doing and what is happening so you can yell me why?*
* *
*First the only problem I am having is after the CTCSS becomes active
then drops, the tail of the NHRC will broadcast NON PL signals or
interference for the duration of the tail. I need to mute the non PL
audio coming into the controller after the CTCSS DECODE STOPS. *
* *
*I am using the Repeater Builder Circuit you suggested and the CTCSS
Decode goes thru the transistor/relay switch hooked to the receiver
COS. Now if there is noise on the RX the switch stays active as it is
responding to CAS not tone. I would like to have a way for the switch
to respond to tone, rather than CAS. *
* *
*Because I don't always describe things, let me give you an example:*
* *
*I put the service monitor on the repeater and generate a noisy CSQ
signal. The receiver responds, but the controller waits for PL. Then I
turn on the PL and the NHRC-4 repeats and I hear the noise from the
generator coming through the HT set for tone squelch. Now I shut off
the tone on the generator and the HT goes quiet. If you listen to the
output of the repeater using carrier squelch you can hear the noise
from the service monitor for the duration of the tail. The tail
closes, the controller stops and all is quiet until another PL brings
up the controller. *
* *
*I need to mute the controller without affecting the RX audio or the
output that sends the Tones and CW ID.*
*
Maybe you have two audio paths? What?
It would seem to me that your repeat audio is not going through the
controller, or maybe not all of it is. I have seen instances where the
_original_ audio path in a repeater hadn't been removed when a
controller was installed, and the situation you are describing
happened. The NHRC-4 controller is designed to mute the audio any time
the COS light is out. It handles audio muting and keying with "and
squelch" logic, so unless something is wrong with the controller, the
audio should mute when the PL is removed (minus a short response
time). Could it be possible that you have two audio paths? Doing some
simple tests will reveal it.
Push a few touchtones and see if you hear them come through the repeater
transmitter (assuming you have DTMF muting enabled). Turn the RX audio
pot all the way down and see if there is still audio passing through the
repeater.
Scoping the audio path will also help you determine were the audio path
is going astray.
Kevin
*
