In article ,
Tom Ring wrote:

ml wrote:


question is what is that value how do i calculate how big a battery i
need at the know constants?



Rich the reason i thought of cap's was both the short key down time and
the article in cq of this new powersupply that uses a few 5farads it
got me thinking if it could be modified to do dc to dc regulation
rather than 120v ....maybe i was pushing it, then i thought of
supercapacitors i dunno

I got the pricing from jadoo's site for the unit plus 6 container combo.
And you will still need something to refill.

On the battery, when we used to VHF contest with a light (600W)
generator and power supplies, we would put a 25AH battery across each 15
amp supply and we could draw 40 or 50 amps on CW/SSB peaks with no
issues. So you would probably be well served by one of the 7AH UPS
batteries from a place such as Batteries Plus. They cost about $25 and
are about 7"Lx2"Wx4"H.

tom
K0TAR

gosh, i sure do appreciate everybody's help, sincerely, but alas, i
still have no concise way to calculate what size battery or cap i need

but i can add a few things, even thou it's sorta a different topic
many here seem concerned about the size of the canisters and refilling
them, this is not a concern as the unit will be feed directly off a
large Hydrogen tank, not the little canisters i do not need to
calculate how long the unit(jado) will run at load vs fuel supply this
is already a known constant and published thats the easy part

the unit does 12v unregulated at about 7amps if you hit 7amps for long
voltage goes down to 10v so i will add some regulator if needed

when i said my radio(2m mobile) will be ""putting out 5w on low pwr""
i ment 5w rf output not current draw sorry

so rich since your calculation was for ah what would it be for for
the correct above spec's?? amps or 100w (no ah)?

i would have to have a battery big enough to be -drained little enough
so that the jado would be able to recharge it during the rx time(least
load) from what tx drained the battery obv if the battery is too
big then the jado wouldn't be able to recharge it or float it

right now i have 2 G27(parallel) and i float them at less than 1amp

naturally when i say recharge i don't mean from anything other than a
slight drain as in normal tx /rx

so the question become how do i calculate that? and would a ultra cap
fit in ?

i thought it would be kinda simple, gut wise i can guess but what i
was hoping for here was a more precise calculation of what would do
the trick

again thanks all for taking the time to respond , i always learn
something


ml