SOME AX 25 BBS STUFF

AO-10 FREQUENTIES

because of some freq measurements to ao-10 i worked out the following formulas : ( from a basic one : downlink = 581.004 - uplink )
perhaps you could use this formulas hi so i placed this msg in the bbs

A - RX = 581.004 - ( TX + ds70 ) + ds70/3
B - TX = 581.004 - ( RX - ds70/3 ) - ds70

581.004 : 581 MHz and 004 kHz

ds70 ds2 dopplershift ( resp 435 MHz, 145 MHz )

and ofcourse : ds70 = 3.ds2 and ds2 = ds70/3

RX : freq groundstation listening *
TX : freq groundstation transmitting *

* dopplershift ( ds70 of ds2 ) ACTUAL .....

and : when reading out freq low tol : looking out fr doppler shift
belonging to a certain time and qth loc : ( check )

ds70_AT/QTHLOC = 1,5 . ( 581.004 - [ RX + TX ] )
ds02_AT/QTHLOC = 0,5 . ( 581.004 - [ RX + TX ] )

however, formula A and B could be interesting, only RX or TX with actual
doppler shift into the formula and you know the exact TX or RX freq hihi

basic formula : downlink = 581.004 - uplink ( 581 MHz en 004 kHz )

( info abt ao-10 transponder - how to operate ao-10 )

vy 73 pa3gje (leon) ((-,O))

TEPR

because of some questions i received * abt TEPR ( timed eclips power
regulation ) states : a short expl. ( only state 4 and 5 )

* msg sunsat voice1/2/3 ( ps : AO-27 TEPR settings etc. )

TEPR state 4 : ao-27 enters sunlight, coming out of eclipse
TEPR state 5 : ao-27 still in the light of the sun

4 : start charge batteries ( ONLY charge )
5 : during state 5 * TX works fr a certain time

* footprint => latitudes - US

in this case you could say : start state 4 and 5 at the same moment, nl :
when sat comes out of eclips ( ^leaving^, end of TEPR state 3 )

1 - during state 4 only charging
2 - at the END of state 4 start TX, time OVER ( state 5 ) = time TX
is working ( sat qrv )

pe : state 4 : 18
state 5 : 36 thus : time ( TX = ON ) : (36-18) / 2 = 9 min
( TEPR states expressed in 30-second increments )

with help of yr sat track prgr you will see now when ao-27 is qrv .....
suppose : ao-27 is rising above horizon ( AOS ) but ^arrived^ only 3 minutes
earlier in sunlight : you must wait 6 minutes till sat is qrv !
( when 4 : 18 5 : 36, see example )

why TEPR states ? because : it gives a good condition of the batteries and
a longer lifetime, i think it works very well !

more abt TEPR states

55 73 pa3gje (leon) ((-,O))

ps : AO-27 TEPR settings ( current )

See http://www.amsat.org/amsat/news/ans2001/wsr01292.html#ao-27