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G0FTD > INFO 11.03.03 03:06l 83 Lines 3036 Bytes #999 (0) @ WW
BID : F10474G0FTD
Read: DG8NGN DB0FHN GUEST
Subj: More Pioneer 10 info.
Path: DB0FHN<DB0RGB<OK0PPL<RZ6HXA<SP7MGD<ZL2TZE<GB7PZT<GB7YKS<GB7MAX<GB7COV<
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Sent: 030310/1803Z @:GB7SXE.#38.GBR.EU #:11837 [Hastings] FBB7.00i $:F10474G0FT
From: G0FTD@GB7SXE.#38.GBR.EU
To : INFO@WW
I had an interesting SP from VK3EUB (thanks Brian), who sent me a copy
of a bulletin he had sent last year. It contains some interesting figures.
I wish I had seen this earlier, would have saved me a lot calculations :-)
Now to the accuracy of my calculation.
My erp figure went wrong (now I have retraced my steps on the scrap paper
I used), when I tried to convert the figure in watts to more manageable
units and got confused (as pointed out by PE1AUK!).
If I had stuck to just using the actual wattage figure I would have
come up with -131dbm instead of -161dbm. Thats the 30db that PE1AUK
pointed out - nice to know someone is taking an interest).
This figure now ties up with the official figures stated below from
Brian, VK3EUB's info (0.7db difference!)
So the free space path loss and antenna gain calculation was correct,but
I messed up the uplink erp when converting the watts with many zero's to other
manageable units :-)
Can I claim my lost point because I worked out what kind of billion was
being used :-) ??
Below is Brians info:
Interesting to see the the earth receiver resolving a signal at -183dbm
for 0.5db signal to noise ratio.
---
PIONEER 10 LIVES ON
~~~~~~~~~~~~~~~~~~~
AFTER 30 YEARS FROM LAUNCH AT CAPE CANAVERAL ON MARCH 2, 1972, PIONEER 10
DATA WAS RECEIVED AT MADRID
GOLDSTONE
~~~~~~~~~
On 1 March 2002, DSS 14 transmitted an uplink, and two no-op commands at
200 kw to the spacecraft.
MADRID
~~~~~~
22 hours later, from 79.4 AU, DSS 63 acquired the downlink on time at
-183 dbm. After peaking the signal to -178.5 dbm, they locked the
telemetry at 16 bps with SNR of -0.5 db.
ARICEBO
~~~~~~~
SETI Institute also acquired the same signal at Puerto Rico. SETI has
been using Pioneer 10 as a reference signal.
PIONEER SPACECRAFT IS HEALTHY
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Very cold with most temperature readings at the bottom of their scale.
Bus voltage about 26 volts (nominal is 28). Uplink received from DSS 14
at -131.7 dbm. Two commands received, both confirmed as executed. Geiger
Tube Telescope Instrument on, and data received.
Above from report given to JPL by Bob Ryan
Project Phoenix has been observing Pioneer 10 at Arecibo in Puerto Rico
through the auspices of the SETI Institute. The signal from Pioneer 10
was also picked up at Arecibo on 2 March 2002.
---
Ah well, it's been an interesting topic for a few days...whats next ?
ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿
³ 73 - Andy ³
³ G0FTD ³
³ Psion Revo owner ³
³Msg sent 10-03-2003³
³ ÚÄÄÄÄÄÄÄÄÄÄÄÄÄ¿ ³
³ ³ Û ³ ³
ÀÄÄÁÄÄÄÄÄÄÄÄÄÄÄÄÄÁÄÄÄÙ
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