Battery Source

Hi,
Just to dive in here, with a slightly off track comment. The
benefits of extra
voltage on the radio transmit are not worth the effort. A quick trawl
through
the figures shows that you need to make an x10 output improvement in output
to
hear/notice it at the other end.

Changing the coax feeding the antenna to a good quality low loss grade,
followed
by tuning the antenna for the frequency range your using, would give more
useful benefits. The receive improvement gained here, is also not to be
sniffed at.

I wonder how many have put a VSWR meter on their setup? Any SWR above 1.5
is going to be a detrimental. On most gliders I would estimate that the
power reaching
the antenna is only 50% of that, that left the radio!!

Malcolm - G3REM (but only a poor, K6 pilot)



"T o d d P a t t i s t" wrote in message
...
"bumper" wrote:

By the time most modern radios would start to falter, the battery is
already
pretty much discharged. Using an up-converter is this circumstance would
only result in a very limited amount of additional radio use - - along
with
a very discharged battery!

I don't think he was advocating an up-converter to increase
voltage when the battery was dying. I think he was
suggesting it for the additional transmitted power you would
get from 14 volts even when the 12V battery is fresh. Even
if it was practical (which I doubt) you'd be losing battery
capacity to gain the higher voltage - that's probably not a
good trade-off for reasons discussed in Tim Mara's post.


T o d d P a t t i s t - "WH" Ventus C
(Remove DONTSPAMME from address to email reply.)