Does the Pegasus work this way as well? I noticed they don't stress for a
tentec PS or a circuit breaker as they did with the older Tentec rigs.
When lightening took out the finals in my Pegasus the power supply (Tentec
961) shut down on voice peaks. Can I assume it would have protected itself
on any supply?
On Wed, 27 Oct 1999, Dave Bowker wrote:
> The collector current to the PA output transistors is monitored as a voltage
> drop across R5 (0.015 Ohm/10W) on the DC input board and fed to op amp U2
> and Q14 on the 9 MHz mixer/IF board. U1B compares the set power level (as
> determined by the front panel RF PWR control) to the preset current (as set
> by R54 with the RF PWR control fully clockwise) and controls a pin-diode
> attenuator consisting of D18/D19. If the PA collector current exceeds a
> preset level of 22 amps the RF drive available at connector-27 (TXD OUT) is
> reduced to protect the PA transistors.
> Essentially, the PA is capabable of operating into a dead short or open, or
> anything between, until the safe collector current point is reached. You
> can always maintain a lower output power under high SWR conditions by
> backing off on the RF PWR control.
> 73, Dave, K1FK
> Fort Kent, ME
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