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CX2SA > SATDIG 07.06.11 04:24l 769 Lines 22485 Bytes #999 (0) @ WW
BID : AMSATBB6309
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Subj: AMSAT-BB-digest V6 309
Path: IZ3LSV<IK2XDE<DB0RES<ON0AR<ZL2BAU<CX2SA
Sent: 110607/0220Z @:CX2SA.LAV.URY.SA #:9684 [Minas] FBB7.00e $:AMSATBB6309
From: CX2SA@CX2SA.LAV.URY.SA
To : SATDIG@WW
Today's Topics:
1. Re: SO67 Over the Americas (Giacobbe Lauser)
2. Getting back into Sats- current state of affairs (Tim Goodrich)
3. PSK v. APRS (Greg Dober)
4. Re: COMPASS Heard? (PA3GUO)
5. Re: Broadcasting (APRS for communication) (PA3GUO)
6. Re: Getting back into Sats- current state of affairs (PA3GUO)
7. Re: COMPASS Heard? (Alan Cresswell)
8. Re: PSK v. APRS (Nigel Gunn G8IFF/W8IFF)
9. Re: PSK v. APRS (Trevor .)
10. Re: PSK v. APRS (Greg Dober)
11. ISS digi QSO (Jeremy Bomkamp)
12. Re: HR 607 Efforts - Thank you (Peter Portanova)
13. FunCube Dongle on Ebay (Rick Tejera)
14. Re: PSK v. APRS (John Becker)
15. Re: PSK v. APRS (Greg Dober)
16. Re: PSK v. APRS (Justin Pinnix)
17. Re: Broadcasting (Eric H. Christensen)
18. Re: PSK v. APRS (Tony Langdon)
----------------------------------------------------------------------
Message: 1
Date: Mon, 6 Jun 2011 12:23:03 -0700
From: Giacobbe Lauser <23tauri@xxxxx.xxx>
Subject: [amsat-bb] Re: SO67 Over the Americas
To: amsat-bb@xxxxx.xxx
Message-ID: <BANLkTimMonKGO0RH1JyZKfc3K-m1BdYANw@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Thanks, Hans! We're looking forward to it!
- Jake, KK6L
------------------------------
Message: 2
Date: Mon, 6 Jun 2011 12:28:27 -0700
From: "Tim Goodrich" <tim@xxxxxxxxxxx.xxx>
Subject: [amsat-bb] Getting back into Sats- current state of affairs
To: <amsat-bb@xxxxx.xxx>
Message-ID: <014601cc247f$e94bb080$bbe31180$@xxx>
Content-Type: text/plain; charset="US-ASCII"
Hi All,
It's been a few years since I've posted here, but just bought a Yaesu 736R
over the weekend and am back to experimenting with the birds. Looking at the
AMSAT page, it's sad to see how few birds are operational, including the
once stellar AO-51 and also HO-68 (which I never got to work).
I did hear VO-52 and the APRS on ISS last night. However, this morning, I
tried to activate SO-50 during the 9:07PST pass and I didn't hear anything.
Is there a problem with this bird, is it too weak for me to hear, or was
there just no activity? I should have been able to hear myself after
activating it with the tones on full duplex, but didn't.
Thanks,
Tim
K6TW (formerly KI6VBY)
Yaesu FT-736R
2m and 70cm homebrew Quadralfilar Helixes, 50ft LMR-400
------------------------------
Message: 3
Date: Mon, 6 Jun 2011 16:07:44 -0400
From: "Greg Dober" <almetco@xxxxxxx.xxx>
Subject: [amsat-bb] PSK v. APRS
To: <amsat-bb@xxxxx.xxx>
Message-ID: <000001cc2485$65ef65a0$31ce30e0$@xxx>
Content-Type: text/plain; charset="us-ascii"
Bob,
Guess the APRS dilemma was like splitting the atom. The real use and the
unintended use.
Could a system like the ISS be switched to a PSK31 or similar mode in the
future? How well would PSK work with Doppler etc? I use it on HF, but was
wondering if FM and satellites could be feasible. I believe this was
mentioned as possibly being part of Fox's system.
73
Greg
N3MVF
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of Bob Bruninga
Sent: Monday, June 06, 2011 2:41 PM
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: Broadcasting
> but isn't 99.9% of all APRS broadcasting?
> You never really expect a response from anyone...
> Most of it is amateurs BROADCASTING their locations,
> no emergency traffic...
That is simply because too many people were completely mislead into thinking
of APRS as a vehicle tracking system which is just wrong. It was nothing of
the kind. It evolved from the 1980's desire to get away from one-on-one
packet BBS's with NO human contact back to HUMAN-to-HUMAN live information
exchange.
But then in the mid 1990's GPS came out and so did a lot of stupid trackers
and now we are stuck with this light's-on-nobody-home scenario in a lot of
people's minds. See how wrong these assumptions are:
http://aprs.org/APRS-tactical.html
My focus in APRS has always been about live contact. That is why now all
new APRS radios not only communicate the position of the other stations, but
also their voice contact frequency in every packet. See:
http://aprs.org/localinfo.html
Bob, Wb4APR
_______________________________________________
Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 4
Date: Mon, 6 Jun 2011 22:25:42 +0200
From: "PA3GUO" <pa3guo@xxxxx.xxx>
Subject: [amsat-bb] Re: COMPASS Heard?
To: <amsat-bb@xxxxx.xxx>
Message-ID: <000001cc2487$e9f2cc50$bdd864f0$@xxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"
Hi Bob,
Compass sounds like this:
<http://www.pa3guo.com/compass_pa3guo_30apr08_0920utc_cw_437.275.mp3>
http://www.pa3guo.com/compass_pa3guo_30apr08_0920utc_cw_437.275.mp3
Regarding demo purposes, here is a demo of how to turn on the CW beacon:
http://youtu.be/dwELlPwExsQ
I would suggest to contact Mike, DK3WN, for details on Compass operations.
Actually, there is a world-wide team monitoring Compass on a daily basis:
http://www.dk3wn.info/p/?cat=5
Henk, PA3GUO
------------------------------
Message: 5
Date: Mon, 6 Jun 2011 22:30:34 +0200
From: "PA3GUO" <pa3guo@xxxxx.xxx>
Subject: [amsat-bb] Re: Broadcasting (APRS for communication)
To: <amsat-bb@xxxxx.xxx>
Message-ID: <000501cc2488$98033140$c80993c0$@xxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"
Regarding APRS usage:
We did use the ANDE-1 APRS capabilities for transmission of telemetry from
the satellite,
commanding the satellite, as well as for 'regular' communication between
radio-stations:
http://www.pa3guo.com/ande.html
1223082942: PA3GUO-8]APRS,ANDE-1*,qAO,PA3GUO::OE5RPP : QSL de Henk
1223082941: OE5RPP]APU25N,ANDE-1*,WIDE7-7,qAO,PA3GUO:]230756zvy73 from
Attergau, Austria via SAT de Peter
1223082928: PA3GUO-8]APRS,ANDE-1*,qAO,PA3GUO::G7THL : QSL de Henk
!S 08:28:11 !G7THL>APU25N,ANDE-1*::PE1ITR-3 :QSL? 73s Dave G7THL{38
1223082901: PA3GUO-8]APRS,ANDE-1*,qAO,PA3GUO::F8NHA : QSL de Henk
1223082851: F8NHA]T4QQP0,ANDE-1*,TRACE,qAo,EI7IG:`xK l
-/]F8NHA@xxxxxxxxx.xxx
1223082849: PA3GUO-8]APRS,ANDE-1*,qAO,PA3GUO::F4BVC : QSL de Henk
1223082842:
F4BVC-7]TY1YQ5,ANDE-1*,WIDE,qAO,PA3GUO:`waGm!U]/]"4$}f8kgk.dyndns.org
1223082934: DL8DR]APRSAT,ANDE-1*,qAO,PA3GUO:=5328.17N/00949.92EyANDE
deorbit, pse QSL {UISS51}
1223082856: PE1ITR-3]APRS,ANDE-1*,ARISS,qAo,EI7IG::F4BVC-7 :59 here de Rob
pe1itr@xxxxx.xxx
Henk, PA3GUO
------------------------------
Message: 6
Date: Mon, 6 Jun 2011 22:35:47 +0200
From: "PA3GUO" <pa3guo@xxxxx.xxx>
Subject: [amsat-bb] Re: Getting back into Sats- current state of
affairs
To: <amsat-bb@xxxxx.xxx>
Message-ID: <000a01cc2489$51e54080$f5afc180$@xxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"
Hi Tim,
Welcome back !
An excellent place to track cubesat status (updated daily):
http://www.dk3wn.info/p/
http://oscar.dcarr.org/ lists status of all the amateur radio satellites
Henk, PA3GUO,
------------------------------
Message: 7
Date: Mon, 6 Jun 2011 20:39:40 -0000
From: "Alan Cresswell" <alancresswell@xxxx.xx.xx>
Subject: [amsat-bb] Re: COMPASS Heard?
To: "'Bob Bruninga'" <bruninga@xxxx.xxx>, <amsat-bb@xxxxx.xxx>
Message-ID: <72B220A1F6C348E394F3CAC6639E0106@xxxxxxxxx>
Content-Type: text/plain; charset="iso-8859-1"
Hi Bob,
Not only is the Compass beacon alive and well with housekeeping information
every three minutes but if you care to send it a few DTMF tones when it is
sunlit it will respond with beacons, housekeeping data at 4800 etc. DK3WN
has decoders on his website.
A typical beacon decode:
Solar Cell Voltage 4.84 V
Solar Panel 6 Cur (+Z) 112.94 mA
Solar Panel 2 Cur (+Y) 0.00 mA
Solar Panel 3 Cur (-X) 0.00 mA
Solar Panel 4 Cur (-Y) 0.00 mA
Solar Panel 5 Cur (-Z) 43.92 mA
EPS Reset Counter 1
Power Level Battery Charging
Heater Active Battery Heater OFF
Power Safe Counter 2
Emergency Mode Counter 0
Battery Voltage 4.00 V
Battery Current 0.00 mA
Battery Temperature 7 ?C
73
Alan
ZL2BX
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of Bob Bruninga
Sent: Monday, 6 June 2011 18:54
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] COMPASS Heard?
Think I heard COMPASS-1 today?
Today while listening to the clean tones of CO-65, another very warbly CW
signal came up right on top of it. I did a quick scan of all other AMSATS
and found that Compass was over at the same time.
I notice it is listed as semi-operational. I guess this was one of those
Semi's?
Or is it on all the time and I can add it to my list of Demo satellites?
Bob, WB4APR
_______________________________________________
Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
-----
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------------------------------
Message: 8
Date: Mon, 06 Jun 2011 20:55:25 +0000
From: Nigel Gunn G8IFF/W8IFF <nigel@xxxxx.xxx>
Subject: [amsat-bb] Re: PSK v. APRS
To: Greg Dober <almetco@xxxxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Message-ID: <4DED3EBD.5030400@xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
It could but it would require a dedicated computer. Packet just works within
the TNC or radio.
On 06-Jun-11 20:07, Greg Dober wrote:
>
>
> Could a system like the ISS be switched to a PSK31 or similar mode in the
> future?
------------------------------
Message: 9
Date: Mon, 6 Jun 2011 22:38:31 +0100 (BST)
From: "Trevor ." <m5aka@xxxxx.xx.xx>
Subject: [amsat-bb] Re: PSK v. APRS
To: amsat-bb@xxxxx.xxx
Message-ID: <928631.10138.qm@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=iso-8859-1
My pet hate is AX.25 1200bps FM which every satellite seems to use, it uses
too much bandwidth, too much power and has no forward error correction.
BPSK systems such as that to be used on ARISSat-1 can provide 1000 bps with
error correction in less than 1/10th the bandwidth.
But the reason AX.25 1200bps FM is still used for new satellites is because
there's so much infrastructure, TNC's, PC software etc, already inplace,
it's the easy option.
Currently there is no single standard for sending data using BPSK not even
the data rate is standardized. I believe the BPSK telemetry on FOX will use
a different standard to ARISSat. FUNcube and UKube-1 will also use different
versions running 1200bps and 9600bps respectively.
Personally I think 9600bps BPSK will be the one to go for in the long term
but none of these BPSK systems are flying yet. So until they are and are
proven to work in space I think AX.25 1200 FM will continue to be used.
Getting new equipment on the ISS has an incrediably long lead time and of
course relies on someones goodwill to pay some $5,000 a kilo freight
charges, so realistically I can't see any significant changes to the ISS
equipment for sometime to come.
73 Trevor M5AKA
--- On Mon, 6/6/11, Greg Dober <almetco@xxxxxxx.xxx> wrote:
> Bob,
>
> Guess the APRS dilemma was like splitting the atom.?
> The real use and the
> unintended use.
>
>
> Could a system like the ISS be switched to a PSK31 or
> similar mode in the
> future?? How well would PSK work with Doppler
> etc?? I use it on HF, but was
> wondering if FM and satellites could be feasible.? I
> believe this was
> mentioned as possibly being part of Fox's system.
>
> 73
> Greg
> N3MVF
------------------------------
Message: 10
Date: Mon, 6 Jun 2011 17:55:45 -0400
From: "Greg Dober" <almetco@xxxxxxx.xxx>
Subject: [amsat-bb] Re: PSK v. APRS
To: <amsat-bb@xxxxx.xxx>
Message-ID: <000301cc2494$7d7dadd0$78790970$@xxx>
Content-Type: text/plain; charset="iso-8859-1"
Trevor et al,
Thanks for your responses. Very enlightening.
Greg
N3MVF
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of Trevor .
Sent: Monday, June 06, 2011 5:39 PM
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: PSK v. APRS
My pet hate is AX.25 1200bps FM which every satellite seems to use, it uses
too much bandwidth, too much power and has no forward error correction.
BPSK systems such as that to be used on ARISSat-1 can provide 1000 bps with
error correction in less than 1/10th the bandwidth.
But the reason AX.25 1200bps FM is still used for new satellites is because
there's so much infrastructure, TNC's, PC software etc, already inplace,
it's the easy option.
Currently there is no single standard for sending data using BPSK not even
the data rate is standardized. I believe the BPSK telemetry on FOX will use
a different standard to ARISSat. FUNcube and UKube-1 will also use different
versions running 1200bps and 9600bps respectively.
Personally I think 9600bps BPSK will be the one to go for in the long term
but none of these BPSK systems are flying yet. So until they are and are
proven to work in space I think AX.25 1200 FM will continue to be used.
Getting new equipment on the ISS has an incrediably long lead time and of
course relies on someones goodwill to pay some $5,000 a kilo freight
charges, so realistically I can't see any significant changes to the ISS
equipment for sometime to come.
73 Trevor M5AKA
--- On Mon, 6/6/11, Greg Dober <almetco@xxxxxxx.xxx> wrote:
> Bob,
>
> Guess the APRS dilemma was like splitting the atom.?
> The real use and the
> unintended use.
>
>
> Could a system like the ISS be switched to a PSK31 or
> similar mode in the
> future?? How well would PSK work with Doppler
> etc?? I use it on HF, but was
> wondering if FM and satellites could be feasible.? I
> believe this was
> mentioned as possibly being part of Fox's system.
>
> 73
> Greg
> N3MVF
_______________________________________________
Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 11
Date: Mon, 6 Jun 2011 16:09:18 -0700 (PDT)
From: Jeremy Bomkamp <wa113y3s@xxxxx.xxx>
Subject: [amsat-bb] ISS digi QSO
To: amsat-bb@xxxxx.xxx
Message-ID: <693195.61257.qm@xxxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
What requirements are there for a valid QSO over the ISS digi? Is it the same
as AO-51 where it is just an exchange of callsign and grid? Can it be done
through the Comment text of an APRS HT like the VX8GR or THD72? Or is a tnc
needed or software like UISS?
------------------------------
Message: 12
Date: Mon, 06 Jun 2011 19:22:26 -0400
From: "Peter Portanova" <wb2oqq@xxxxxxx.xxx>
Subject: [amsat-bb] Re: HR 607 Efforts - Thank you
To: "Bryan Green" <bag@xxx.xxx>
Cc: AMSAT-BB@xxxxx.xxx
Message-ID: <573C3675E53743F6A295952D2659D8DD@xxxx>
Content-Type: text/plain; format=flowed; charset=iso-8859-1;
reply-type=original
Hello Bryan,
I appreciate you're thoughtful comments on our visit with Congressman King,
I thought of the passage by Hillel, If Not Now When? Amateur Radio
Operators have been without a true friend in Washington since the halcyon
days of Barry Goldwater, let's hope we can build a bridge to help protect
our spectrum, thank you.
Regards,
Peter, WB2OQQ
------------------------------
Message: 13
Date: Mon, 6 Jun 2011 16:22:42 -0700
From: "Rick Tejera" <saguaroastro@xxx.xxx>
Subject: [amsat-bb] FunCube Dongle on Ebay
To: <amsat-bb@xxxxx.xxx>
Message-ID:
<20110606232302.YPCZ17030.fed1rmfepo101.cox.net@xxxxxxxxxxxx.xxx.xxx>
Content-Type: text/plain; charset="us-ascii"
All, A few days ago I warned of a seller on Ebay who, after not getting his
hoped for price from my friend, sent him the dongle, but only after taking a
hammer to it. Just happens Chris works as a senior systems engineer for
Ebay. He gave me the guys details to post here so you can avoid him if you
are bidding on a FCD:
User ID: aaronm10000
Name: Aaron D. McClure
City: Fremont
State:CA
Country: US
Phone: (510) 366-8710
Registered Since: Saturday, Jun 10, 2000 22:47:28 PDT
Clear Skies
Rick Tejera
Saguaro Astronomy Club
Phoenix, Arizona
www.saguaroastro.org <http://www.saguaroastro.org/>
saguaroastro@xxx.xxx
K7TEJ, AMSAT 38452
------------------------------
Message: 14
Date: Mon, 06 Jun 2011 18:22:59 -0500
From: John Becker <w0jab@xxxxxxxxx.xxx>
Subject: [amsat-bb] Re: PSK v. APRS
To: amsat-bb@xxxxx.xxx
Message-ID: <5.2.0.9.2.20110606182107.026be0b0@xxxx.xxxxxxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"
Sounds just like yet another "anti wide" rant to me.
John, W0JAB
------------------------------
Message: 15
Date: Mon, 6 Jun 2011 19:43:47 -0400
From: "Greg Dober" <almetco@xxxxxxx.xxx>
Subject: [amsat-bb] Re: PSK v. APRS
To: <amsat-bb@xxxxx.xxx>
Message-ID: <000001cc24a3$957fed80$c07fc880$@xxx>
Content-Type: text/plain; charset="us-ascii"
Hi John,
I'm not so sure it's an anti-wide rant. It is a discussion on a possible
way to get more efficient use from the limited bandwidth and power on the
bird. I love playing with RTTY on HF and packet on VHF, but when you head
down to 14.070 and see all the stations on the sliver of band qso'ing, it
seems appealing to use to eliminate overcrowding on a satellite.
Greg
N3MVF
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of John Becker
Sent: Monday, June 06, 2011 7:23 PM
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: PSK v. APRS
Sounds just like yet another "anti wide" rant to me.
John, W0JAB
_______________________________________________
Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 16
Date: Mon, 6 Jun 2011 21:42:22 -0400
From: Justin Pinnix <justin@xxxxxxxxxxxxx.xxx>
Subject: [amsat-bb] Re: PSK v. APRS
To: Greg Dober <almetco@xxxxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Message-ID: <BANLkTimOJY=qPRhpeM=irqX-DNKdk9OH+Q@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Greg, you're overlooking something - the time dimension.
Yes, packet is a one-at-a-time affair, but those packets move quickly -
1200bps vs 31bps for PSK31. So, each station only has the bird tied up for
a short period of time. You could think of it as a form of time division
multiplexing.
73 de AJ4MJ
On Mon, Jun 6, 2011 at 7:43 PM, Greg Dober <almetco@xxxxxxx.xxx> wrote:
> Hi John,
>
> I'm not so sure it's an anti-wide rant. It is a discussion on a possible
> way to get more efficient use from the limited bandwidth and power on the
> bird. I love playing with RTTY on HF and packet on VHF, but when you head
> down to 14.070 and see all the stations on the sliver of band qso'ing, it
> seems appealing to use to eliminate overcrowding on a satellite.
>
> Greg
> N3MVF
>
> -----Original Message-----
> From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
> Behalf Of John Becker
> Sent: Monday, June 06, 2011 7:23 PM
> To: amsat-bb@xxxxx.xxx
> Subject: [amsat-bb] Re: PSK v. APRS
>
> Sounds just like yet another "anti wide" rant to me.
>
> John, W0JAB
>
>
>
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
>
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
>
------------------------------
Message: 17
Date: Mon, 6 Jun 2011 21:42:26 -0400
From: "Eric H. Christensen" <eric@xxxxxxxxxxxxxxxx.xx>
Subject: [amsat-bb] Re: Broadcasting
To: Jeremy Bomkamp <wa113y3s@xxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Message-ID: <20110607014226.GA3979@xxxxxxxxxxxxxxxx.xx>
Content-Type: text/plain; charset=us-ascii
On Sun, Jun 05, 2011 at 05:57:01PM -0700, Jeremy Bomkamp wrote:
> Bash Kevin if you want, but isn't 99.9% of all APRS broadcasting? You never
> really expect a response from anyone, and what true purpose does the digi
on the
> ISS perform? Most of it is amateurs BROADCASTING their locations, no
emergency
> traffic, the only real protocol is to ID and no swearing which both KF7MYK
and
> KF7BUZ complied with, at least it wasn't HI HI, roger, roger
I for one love making APRS contacts over the ISS and other satellites.
Sure, I send my position reports but I also send messages and actually
communicate. I've had many hams come back to my CQ messages. Maybe you
should try it.
73
Eric W4OTN
------------------------------
Message: 18
Date: Tue, 07 Jun 2011 12:17:18 +1000
From: Tony Langdon <vk3jed@xxxxx.xxx>
Subject: [amsat-bb] Re: PSK v. APRS
To: Justin Pinnix <justin@xxxxxxxxxxxxx.xxx>, Greg Dober
<almetco@xxxxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Message-ID: <4ded8a38.e21b440a.55a4.067a@xx.xxxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"; format=flowed
At 11:42 AM 6/7/2011, Justin Pinnix wrote:
>Greg, you're overlooking something - the time dimension.
>
>Yes, packet is a one-at-a-time affair, but those packets move quickly -
>1200bps vs 31bps for PSK31. So, each station only has the bird tied up for
>a short period of time. You could think of it as a form of time division
>multiplexing.
Of course, if everyone is using computer frequency control, then
dozens, if not hundreds of simultaneous QSOs can take place. In
other words, frequency division multiplexing.
73 de VK3JED / VK3IRL
http://vkradio.com
------------------------------
_______________________________________________
Sent via amsat-bb@xxxxx.xxx. Opinions expressed are those of the author.
Not an AMSAT member? Join now to support the amateur satellite program!
http://amsat.org/mailman/listinfo/amsat-bb
End of AMSAT-BB Digest, Vol 6, Issue 309
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