|
Q:
What is the Nulling and Set-up
of the SSA 324 |
A:
FRONT
- gently with 2mm flat blade tweaker
- Set DUCK pot fully clockwise (CW) (# note Ducking)
- Set all other pots to mid point
- Press channel select IN or OUT to convert desired RTS circuit
REAR
- (if not supplied as part of a system)
- Insert the 25 pin D connector into socket J103
- Set 2 Blue switches in OUT position for RTS
- Plug RTS power into 2W in/out sockets
FRONT
- insert headset
- Adjust Volume pot to ¼ max level
- Press in Test button (# note 1)
ADJUST
- Med Pot to reduce test tone around 1kHz centre frequecy (# note 2) Caution!
- Hi pot to reduce test tone around 300Hz centre frequency
- Lo pot to reduce test tone around 3kHz centre frequency
Repeat ADJUST
- Increase Volume Pot to ½ level or more (# note 3)
Repeat ADJUST
- Increase Volume Pot To safe listening Level
Repeat ADJUST
- Now talk on the intercom circuit to the 4 W output and adjust the "From
RTS" level
- Adjust the incoming level , "To RTS" level as required.
Any CHANGES may require further gentle ADJUSTment.
NOTES
# note 1
If no test tone is heard, this is set inside the unit on a "handbag". W2
= Test tone. W3 = headset mic.
# note 2
The Level and frequency will change.
Take the pot through and back the perceived minimum point to estabilish the
best null for each of the Med, Hi and Lo pots.
CAUTION: If the "Med" pot is turned fully ACW there will be no audio on the
4W output.
# note 3
You should only need to make a minor adjustment to the "Med" pot on each
of the repeat ADJUSTments
DUCKING
Ducking will mute the quieter of the 4W signals in order to suppress unwanted "sidetone" between
the 4W in and 4W out. It should only be used as a final last resort. If not
set correctly it will probably result in spurious burbling of audio.
The ducking range is 0db CW to 30dB ACW. |
