John,
We should have omni antennas for perigee commanding. That tends to
work when
all else fails.
Rick
W2GPS
AMSAT LM2232
-----Original Message-----
From: [email protected] [mailto:[email protected]] On
Behalf Of
John B. Stephensen
Sent: Saturday, September 23, 2006 12:10 PM
To: Robert McGwier
Cc: 'EAGLE'
Subject: [eagle] Re: IF switching
Bob:
In Mirek's design there is an L-band receiver PCB and a command
receiver or
command detector PCB mounted in one module. The two connect via
the 10.7 MHz
IF. Command detectors could be connected to both the U and L
receivers.
Are you suggesting one L receiver connected to an omni antenna and
used only
for the command link and a second L receiver connected to a gain
antenna and
only used for the transponders? A smaller solution would be one L
receiver
with an antenna relay.
73,
John
KD6OZH
----- Original Message ----- From: "Robert McGwier"
<[email protected]>
To: "Robert McGwier" <[email protected]>
Cc: "'EAGLE'" <[email protected]>
Sent: Saturday, September 23, 2006 04:25 UTC
Subject: [eagle] Re: IF switching
Robert McGwier wrote:
Robert McGwier wrote:
The downlinks in Lyle's SDX block diagram are two-fold. S and
V. The
only change I would make for Eagle is to make both of them
HELAPS. This
might prevent both of them being used simultaneously as HELAPS
but it
might not. We might choose to do a "delay only" version of the
HELAPS
for the second transmitter.
I would like to suggest that we use Mirek's command receiver to
feed the
exact same command receive technology to be used for P3E and
that is the
SDR/FIQ channel on the IHU-3. The less work we have to
repeat, the
better. I believe we should have stand alone command receivers
independent of the transponder antennas. I would like to hear
from John
Errrrr. Uhhhh. We might need antennas. I meant independent
of the
transponder receiver antennas.
I am definitely going to bed now. Independent of the transponder
RECEIVERS. That only took 3 times to get right.
and Mirek on this. Mirek's command receiver is nicely done.
Bob
--
AMSAT VP Engineering. Member: ARRL, AMSAT-DL, TAPR, Packrats,
NJQRP/AMQRP, QRP ARCI, QCWA, FRC. ARRL SDR Wrk Grp Chairman
"You see, wire telegraph is a kind of a very, very long cat.
You pull his tail in New York and his head is meowing in Los
Angeles. Do you understand this? And radio operates exactly
the same way: you send signals here, they receive them there.
The only difference is that there is no cat." - Einstein
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_______________________________________________
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[email protected]
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<Transponder Architecture - L RX.pdf>