VK8PDG > PK232 08.08.02 10:24l 22 Lines 933 Bytes #999 (0) @ WW
BID : 20248_VK8PDG
Read: DB0FHN GUEST DG4YDF
Subj: PK-232 can copy satellite telemetry 4 of 5
Path: DB0FHN<DB0ZWI<DB0HOT<OK0PKL<OK0PPL<RZ6HXA<IK1ZNW<HR2PAQ<WB7AWL<HA3PG<
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Sent: 020809/0320z @:VK8PDG.PLM.#NT.AUS.OC [Winlink N T] Z:0830 #:20248
PK232SAT.4 of 5
Frequencies are plus or minus doppler shift. An oscilloscope
connected to the PK-232 will simplify keeping up with the
doppler shifted tones on AO-13 as a shift in the cross pattern
is seen easier than a shift of the PK-232's leds.
Tones do not change with doppler on the Uosat birds as they are
FM AFSK.
RXR does not operate above 300 baud because of hardware limitations.
As Uo-9 sends normal shift this is no problem.
But to copy Uo-11's inverted shift an unused inverter in the
PK-232 (U15 pins 1 and 2) must be wired to a switch in series
with the output to JP4 as follows:
1. Solder a jumper wire between U15's pins 1 and 6.
2. Cut the circuit board trace connecting U15's pin 6 to
the inside pin of JP4.
This trace is easiest to cut where it comes out from under R20
on
the top (component side) of the PC board. Be sure to double check
that this
CONTINUED IN FILE PK232SAT.3
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