I would like to turn on the 9420 and Hercules II from the 4 pin transceiver
connector on the 9420. I've seen older posts but didn't quite get an answer or
at least I couldn't figure it out.
According to the power supply (9420) manual page 3-7 second paragraph:
"... This voltage is used to pull in the main power on relays, K1 and K2, by
one of two methods. When the 420 amplifier is switched on +15 VDC is routed
back down the amplifier power cable to J7 and on to Q7, the relay switching
transistor. Q7 pulls in the main power-on relays and powers up the four high
current regulators. Alternatively, the amplifier can be off and and if a load
is connected to the POWER ON pin of the TRANSCEIVER CONNECTOR (pin 3), Q7 will
be biased on and will provide the power-on signal to Q7. In this way the supply
can detect when a transceiver has been turned on and will automatically power
itself up"
I did not hook up a transceiver. I faked it with a resistor to present a load,
a 1.2K then a 600 ohm, pin 3 to pin 1. Sure enough relays clicked. The power
supply hummed. The Hercules II did not power up.
There is confusion about the pin numbers:
Silk screened on amplifier and FIGURE 2-2 in the manual:
1: GND
2: PWR ON
3: +13.5V LO
4: +13.5V 20A
Schematic:
1: XCVR PWR (HI I)
2: XCVR PWR (LO I)
3: Power ON
4: XCVR GND
Text
POWER ON (pin 3)
Two have it one way. Two have it the other way.
Any help would be greatly appreciated.
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