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Coy, I use a different point to take audio from the receiver. I use P904 pin 16 RX PA. Look at the schematic for the IF & Audio board. On the Audio IC U604 pin 6 one will see RX PA out. This is used in the station intercom option. C635 is used to couple the audio to the Audio PA. You can remove that cap and not have to put a load on the speaker output. If you want RX test audio put a switch in series with the cap. Also notice that this point is after the volume control, Channel Guard filter & De-emphasis filter. Use the NHRC vol-sq board to set your level to the controller. One should have all one needs for RX audio. Make sure your controller does NOT have de-emphasis enabled. This method will give you control over the RX audio out & the radio will have the nice "GE" sound. ----- Original Message ----- From: ac0y5 Sent: Saturday, December 13, 2003 2:26 AM Subject: [Repeater-Builder] Re: mastrII help Loren, I have a repeater built out of a VHF MASTRII mobile running a
NHRC2 controller. First, your repeat audio should come from the
Volume/squelch High next, if your repeat audio is not high enough
crank up the Rx input gain. I suggest setting the master level out
pot on the controller to mid point and then adjust the remainder if
the controls to the desired level. I prefer to adjust the receive
level for 4Khz deviation in, you get 4Khz out. That way if you ever
need to make small adjustments you can use the master gain c
ontrol.
as far as CAS or RUS I prefer CAS, but choose which ever you prefer.
I modified the CAS detector so it would not draw excessive current
from the circuit. Since I built my NHRC2 controller using sockets
for all chips including the opto it was easy. CAS and RUS are active
high (CAS/RUS output is about 9 volts unquenched) I used a resistor
in the input pin on the opto tied to a NPN transistor Base. The
emitter and collector are plugged into the emitter and collector
socket pins of the opto socket.
I used Molex connectors for all connections internally to the systems
board and I found connectors for the Power input. I used no part of
the cable harness. If you would like to try this, get a
squelch/Volume board from NHRC.
If you have tried what I suggested above, have you tried turning up
the deviation level on the exciter board using the pot? Use a
deviation measuring device to set your output.
73 and good luck and let me know how it goes
AC0Y
--- In [email protected], "Loren James"
<[EMAIL PROTECTED]> wrote:
> Hi, have a UHF GE MastrII using as a repeater with a nhrc 2
controller and
> the control head/cable w/ mic hooked up for power.. The audio
level (on the
> output) seems to be low. I have the pickup on pin 20 on J901 and
using
> CAS(pin 9 on J904) for the controller. Or should I use the RUS pin
on 904
> board? The pots on the controller don't seem to have enough
adjustment . Any
> help ALWAYS appreciated. N2LSJ
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