[TenTec] ALC Indicator

[ac5e at comcast.net]

Hmmm  - Bob's comments make me wonder if somthing on that order may be the reason I have not observed some of the other things Orion owners have commented on. 

My shack is powered by a pair of RM-70's that are on 24/7, backed by a very fast changeover to battery relay when the AC drops out.  So my Orion always comes on to full or nearly full voltage; where just turning the power supply off without turning the Orion on  would power up the Orion before the PS voltage really stabilized.  Guess I will drag the Tektronix home and look at the keying waveform as well as the PS' initial stability. 

And for another thought, it might be profitable to take a good hard look at the Molex power connector. I have seen a lot of those whose pins are on the loose side giving an intermittant poor contact on power up. 

73  Pete Allen  AC5E


> Regarding power supplies, these comments make me wonder if the power supply
> is turned on an allowed to stabilize a few milliseconds or more before the
> Orion is powered on.  It just may be that if the Orion is on and then the
> power supply is turned on the rise time of the voltage from the PSU may be
> allowing the processor to initialize incorrectly during power ramp up.
> Powering down the Orion and then back up seems to successfully correct the
> concern.
> 
> Again, one tends to point to the new version of software as being the
> problem when in reality with any version, timing issues change and thus
> certain artifacts may become apparent that were not apparent previous or
> later versions.
> 
> Micor P's which use PDI circuits are specially prone to these kinds of
> faults.
> 
> 73
> Bob, K4TAX
> 
>