Yup.  Log base 10 of 5 is 0.69891.  Therefore 7db is right.

Mike Freeman < K 7 U I J >


----- Original Message -----
From: "Steve" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Friday, August 29, 2003 5:56 PM


> Michael,
>
> I can't answer the last question, but recall that doubling of power is
a 3DB
> gain, if I remember my theory correctly.  An S-unit is about 6DB.  So,
> doubling of power isn't that significant.  But, obviously, an increase
from
> 100 to 500 watts is about a 7DB gain, if I recall my tables correctly.
>
> Steve
> K8sp
>
>
> ----- Original Message -----
> From: "Michael Ryan" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Friday, August 29, 2003 10:05 AM
>
>
> Hi all:
>
> Is there a rule of thumb that can be used?
> IE:  you have a perfectly resonant antenna with 100W out.  What power
is
> needed to get an improvement on the signal strength?  Will 200W make
much
> difference or to receive an actual increase in signal strength, a
power
> gain of lets say, 500W is required? Will a power output of 800/KW give
much
> improvements to a 500W signal strength?  Also, If you have an amp
rated at
> 400W continuous or digital mode,  what would the PEP SSB rating be?
>
> Thanks to all & 73:
> Michael VO1RYN
>