UO-14 digital loop test
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Date: Tue, 07 Mar 2000 18:53:34 +0900
From: "M. Wakita" [je9pel@jamsat.or.jp]
To: amsat-bb@amsat.org
Subject: [jamsat-amsat-bb:30675] UO-14 digital loop test
I succeeded to test the digital loop signals on UO-14
at 01:15 - 01:27UTC, 7th Mar 2000.
Then, I set Packet speed 9600bps, RS232C speed 19200bps,
and Mode FSK. And the uplink fixed frequency 145.975MHz,
and the downlink frequency 435.076 - 435.064MHz by doppler.
(1)Set the following example command to TNC:
MODE FSK
HBAUD 9600
ABAUD 19200
AFC OFF
X16 OFF
TXDELAY 70
DWAIT 32
FRACK 8
FULLDUP ON
MAXFRAME 2
PACLEN 128
MONITOR ON
MCON ON
MCOM ON
RESTART
(2)Do into Conversation Mode from Command Mode such as
cmd:K(Enter)
(3)TNC will transmit CQ signals whenever you press enter_key.
(4)When you tune delicately a receiving frequency, you can
hear the clear 'Beep'.
UTC Uplink Downlink
01:15 145.975 435.076 AOS
01:18 145.975 435.073
01:21 145.975 435.070 TCA
01:24 145.975 435.067
01:27 145.975 435.064 LOS
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Date: Tue, 7 Mar 2000 08:58:11 -0500 (EST)
From: Bob Bruninga [bruninga@nadn.navy.mil]
To: "M. Wakita" [je9pel@jamsat.or.jp]
Subject: Re: [amsat-bb] UO-14 digital loop test
Mineo san,
Are you saying that you used packet via the UO-14 in analog bent-pipe
mode and decoded your packets on the downlink? Or are you saying that
the UO-14 is listening for and is "digipeating" (regenerating) packets on
the downlink?
I assume you meant the analog case, and if so, then this is good news
since it shows that the passband of the analog transponder will pass the
9600 baud data. ALthough I doubt that packet will be accepted by most
users..
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Date: Wed, 08 Mar 2000 01:01:37 +0900
From: "M. Wakita" [je9pel@jamsat.or.jp]
To: bruninga@nadn.navy.mil
Subject: Re^2: UO-14 digital loop test
Hello Bob,
Thank you for sending me your very interesting many messages
on 9600bps satellites.
Yes, in this time, I was listening for and was "digipeating" packets
for sounds on the downlink. But I could not decode my packets on the
downlink.
You wrote:
> ALthough I doubt that packet will be accepted by most users..
I think so as UO-14 have only single analog band.
I intend to test on wide band via AO-10 or UO-22 in the next time.
Thank you. 73
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Date: Fri, 10 Mar 2000 18:35:25 +0900
From: "M. Wakita" [je9pel@jamsat.or.jp]
To: amsat-bb@amsat.org
Subject: [amsat-bb:30724] UO-14 digital looptest on 9600bps and 1200bps
A few days ago I succeeded to test the digital loop signals via
UO-14 in 9600bps, FSK mode, uplink fixed frequency 145.975MHz,
and the downlink frequency 435.076 - 435.064MHz by doppler.
Today I succeeded again to test via UO-14, in this time 1200bps.
In this both case of 9600bps and 1200bps, I was listening for
and was digipeating digital packets on the downlink.
But I could not decode my packets on the downlink. It may be
due to the analog transponder of the satellite.
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Date: Fri, 10 Mar 2000 04:34:40 -0800
From: mike_nason@ex.cv.hp.com
To: je9pel@jamsat.or.jp
Subject: RE: [amsat-bb] UO-14 digital looptest on 9600bps and 1200bps
Could the problem with trying to decode your packets be because the
signal was inverted? Just like the old rtty where you sometimes had
to invert the mark and space to copy.
73, Mike KA7HBB
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Date: 10 Mar 00 23:58:43 +1000
From: tlang@freeway.apana.org.au
To: amsat-bb@amsat.org
Subject: [amsat-bb:30730] Re: UO-14 digital looptest on 9600bps and 1200bps
Hello M..
10 Mar 00 18:35, you wrote to ALL:
MW> Today I succeeded again to test via UO-14, in this time 1200bps.
MW>
MW> In this both case of 9600bps and 1200bps, I was listening for
MW> and was digipeating digital packets on the downlink.
MW>
MW> But I could not decode my packets on the downlink. It may be
MW> due to the analog transponder of the satellite.
I'd imagine you'd have fun trying to push 9600 through the bird,
but 1200 could work, as long as the transponder is 'clean' enough.
Tony
.. way memory diffuses fact.
--
|Fidonet: Tony Langdon 3:633/284.18
|Internet: tlang@freeway.apana.org.au
|
| Standard disclaimer: The views of this user are strictly his own.
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Date: Fri, 10 Mar 2000 23:42:54 +0900
From: "M. Wakita" [je9pel@jamsat.or.jp]
To: amsat-bb@amsat.org
CC: tlang@freeway.apana.org.au,
mike_nason@ex.cv.hp.com
Subject: [amsat-bb:30731] Re: UO-14 digital looptest 9600bps and 1200bps
Hello, Mike, Tony, and all,
Thank you for sending me your helpful messages.
I received many mails that it may be set the spectrum inverter
to decord the downlink digital signals from UO-14.
Thank you. 73
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Date: Fri, 10 Mar 2000 08:12:29 -0700
From: Assi Friedman [assib@mainex1.asu.edu]
Subject: RE: [amsat-bb] UO-14 digital looptest on 9600bps and 1200bps
To: "M. Wakita" [je9pel@jamsat.or.jp]
I doubt that the FM repeater on UO-14 is suitable for packet 1200/9600
operation. The repeater was porbably never matched to enable linear
operation for digital modes. Look at the eye pattern you receive on the
downlink. It will probably be all fuzzy. In addition to that, with a
repeater you have to take a hit on Eb/No due to the additive nature of noise
on a repeater.
assi
..............................................................
Assi Friedman, Deputy Program Manager - ASUSat Program
Tel: 480-844-1458 (home)
Tel: 480-965-2474 (ASUSat lab)
Tel: 480-965-2859 (ASUSat office)
Fax: 480-965-0277 (ASUSat lab)
Email: assib@asu.edu
Home Page: http://www.public.asu.edu/~assib
ASUSat Page: http://nasa.asu.edu/asusat
..............................................................
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Date: Fri, 10 Mar 2000 15:13:33 -0000
From: Chris Jackson [c.jackson@eim.surrey.ac.uk]
To: "'M. Wakita'" [je9pel@jamsat.or.jp], amsat-bb@amsat.org
Cc: tlang@freeway.apana.org.au, mike_nason@ex.cv.hp.com
Subject: RE: [amsat-bb] Re: UO-14 digital looptest 9600bps and 1200bps
If by this you mean that it is an inverting transponder, then this a) isn't
correct, and b) doesn't matter. Additionally, remember that UO-14 was the
first satellite to carry 9600bps so the bandwidth is sufficient.
Doing this sort of loopback however isn't efficient and isn't the same as
digipeating. With the analogue loopback the signal is not regenerated in
the way that it is when used via a digipeater.
Just my 2 pence worth...
Chris G7UPN / ZL2TPO
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Date: 11 Mar 00 13:14:11 +1000
From: tlang@freeway.apana.org.au
To: amsat-bb@amsat.org
Subject: [amsat-bb:30754] Re: UO-14 digital looptest 9600bps and 1200bps
Hello Chris.
10 Mar 00 15:13, you wrote to 'M. Wakita':
CJ> Doing this sort of loopback however isn't efficient and isn't the same
CJ> as digipeating. With the analogue loopback the signal is not
CJ> regenerated in the way that it is when used via a digipeater.
You _will_ get degredation of the modulated data waveform, as there is no
regeneration on the satellite now, and any errors in the frequency, phase or
step response of the transponder are additive, as well as Doppler errors and
the like. Also, while the individual Tx and Rx are 9600 baud capable, what
about the analogue interconnection between the two?
Tony
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Date: Sat, 11 Mar 2000 05:29:04 -0500
From: p_perera [p_perera@compuserve.com]
To: Chris Jackson [c.jackson@eim.surrey.ac.uk]
Cc: p_perera [101602.2275@compuserve.com],
"[unknown]" [amsat-bb@amsat.org],
"'M. Wakita'" [je9pel@jamsat.or.jp],
"[unknown]" [mike_nason@ex.cv.hp.com],
"[unknown]" [tlang@freeway.apana.org.au]
Subject: RE: [amsat-bb] Re: UO-14
Hi Chris,
Wondered what the UO-14 operating schedule has been
published recently.At present it seems to be wkg very well
on FM voice communications.I also read somewhere that its on packet also.
If it is ground control from UoS when is it switched between the two
modes.During the last t4weeks when I was out in Sri Lanka and Singapore
we were able to work the satellite on FM. Very good signals too.
Thankful for any further info -could not find any on the UoS website.
73`s
Peter E Perera G4AJG/ 4S7PE
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Date: Mon, 13 Mar 2000 22:58:48 +0900
From: "M. Wakita" [je9pel@jamsat.or.jp]
To: amsat-bb@amsat.org
CC: c.jackson@eim.surrey.ac.uk,
assib@mainex1.asu.edu,
assib@asu.edu,
tlang@freeway.apana.org.au,
p_perera@compuserve.com,
bruninga@nadn.navy.mil,
mike_nason@ex.cv.hp.com
Subject: [jamsat-amsat-bb:30826] Re: UO-14 digital looptest 9600bps
Hello all,
Thank you for many usefully advised mail on UO-14 digital looptest.
I heard that a user in JA succeeded in connecting and digipeating
a few digital 9600bps signals on PC via UO-14.
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Date: Mon, 13 Mar 2000 11:14:15 -0500 (EST)
From: Bob Bruninga [bruninga@nadn.navy.mil]
To: "M. Wakita" [je9pel@jamsat.or.jp]
cc: amsat-bb@amsat.org,
c.jackson@eim.surrey.ac.uk,
assib@mainex1.asu.edu,
assib@asu.edu,
tlang@freeway.apana.org.au,
p_perera@compuserve.com,
mike_nason@ex.cv.hp.com
Subject: Re: UO-14 digital looptest 9600bps
On Mon, 13 Mar 2000, M. Wakita wrote:
> Hello all,
>
> Thank you for many usefully advised mail on UO-14 digital looptest.
> I heard that a user in JA succeeded in connecting and digipeating
> a few digital 9600bps signals on PC via UO-14.
A better translation would avoid the terms "connecting" and "digipeating"
since that means an error free reception and regeneration of a packet.
And there is nothing on UO14 to "connect" to. I think what he meant to
say was that he had tried sending packets through the analog transponder.
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Date: Fri, 17 Mar 2000 13:55:56 -0500 (EST)
From: Bob Bruninga [bruninga@nadn.navy.mil]
To: "M. Wakita" [je9pel@jamsat.or.jp]
Subject: Re: UO-22
On Sat, 18 Mar 2000, M. Wakita wrote:
> Well, I would like to ask you on the digital transponder of
> UO-22. When you received the downlink yourself and anyone
> signals, were you receiving simultaneously the another many
> 'BROADCAST' signals of UO-22 ?
Yes, you see all the other packets from UO-22, but if your packet is
successful, then you will see it just fine...
Bob
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