[NLRS] Power supply and Battery

[mike]

You know all this thinking about power supplys has me thinking of my 
setup which is a 15A Lambda linear power supply floating SLA batteries 
at 13.8 volts.  When I transmitt the system voltage sags a little, how 
much depends on how much current is drawn.  I know bricks and amps in 
general are quite sensitive to voltage relative to the power output and 
that got me to wondering when SSB peaks occure what sort of compression 
effects I might have happening.  These numbers are speculation but might 
be useful for discussion purposes, say with no audio the voltage is 13.4 
and Po=X and with peak audio the voltage sags to 12.9 Po=Y it seems as 
though this has in a sense formed a clipper circuit.  Would this make 
the frickatives in speach difficult to understand?

Any thoughts?  I could measure this with an audio generator and power 
meter at the transmitt end but how could you measure it at the receive end?

Thanks
Mike
KB0ozn