[ARC5] Speaking of Scarce....

[Neil Barnett]

> If you look at other military gear, you see the same sort of thing (a WS 
> 19 for
> example, rated 10 W, typically 14 W). I think it's a conservative number.
> Remember, the input to the dyno was not necessarily always 28 VDC in an
> airplane. I suspect (but don't know) that the set could well put out that 
> power
> at an input of 22 or 24 VDC. (Aircraft power spec was about 22 to 32 VDC 
> in the
> '60s) The dyno is roughly linear so could be expected to put out roughly 
> 400 to
> 425 V at 22 VDC in.
>
> FWIW,
> -John


Hi John
When the aircraft is sitting on the ground with the engine not running, such
as while undergoing maintenance or in an emergency after making a forced
landing, the battery would be considered flat at 21V (based on the lower
limit for a car battery of 10.5V).  The voltage at the radio might be a 
little
over 20V, when cabling losses are taken into account.

You may well be correct that the apparently low power outputs quoted for
CW and AM are conservative and reflect operation at that very low level.
In other words, the quoted power outputs are guaranteed for flat-battery
operation, and will be considerably higher when the aircraft engine is 
running
or the battery is in a better state of charge.

73 de Neil ZL1ANM