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CX2SA > SATDIG 29.05.08 04:35l 822 Lines 26554 Bytes #999 (0) @ WW
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From: CX2SA@CX2SA.LAV.URY.SA
To : SATDIG@WW
Today's Topics:
1. Re: AO-51 2nd repeater operational (Dennis Griffin)
2. JUBILEE and other frustrations (pcalvi(AT)bluewin.ch)
3. Re: Test Gear for 1.2/2.4Ghz Equipment (i8cvs)
4. Re: JUBILEE and other frustrations (i8cvs)
5. 1,2g ts2000 Module (Pedro Cruz)
6. WD9EWK from DM34 and DM25/DM35, 31 May
(Patrick STODDARD (WD9EWK/VA7EWK))
7. I: JUBILEE and other frustrations (Francesco Grappi)
8. Re: AO-51 2nd repeater operational (Jeff Moore)
9. 70cm Mast mounted preamp (Bill Bruno)
10. Re: SatPC32 12.8 released (Ronald G. Parsons)
11. 70cm mast mounted preamp for sale (Bill Bruno)
12. RS-30 receive (John Price)
13. Re: JUBILEE and other frustrations (John Wright)
14. Re: SatPC32 12.8 released (Alan P. Biddle)
15. Re: AO-51 2nd repeater operational (Dennis Griffin)
16. Re: JUBILEE and other frustrations (Bruce Robertson)
----------------------------------------------------------------------
Message: 1
Date: Wed, 28 May 2008 12:12:39 -0700
From: Dennis Griffin <eagleeyedennis(AT)yahoo.com>
Subject: [amsat-bb] Re: AO-51 2nd repeater operational
To: Andrew Glasbrenner <glasbrenner(AT)mindspring.com>
Cc: amsat-bb(AT)amsat.org
Message-ID: <F70D832F-5DCD-47AA-A627-DE842278B0F9(AT)yahoo.com>
Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed
435.300 downlink? I thought it was 435.150.
Thanks for the reply. I've heard ISS just fine with the same setup,
but I see that AO-51 is a bit over twice as high. I'll try open
squelch next time and Doppler tuning on rx. I don't understand,
however, why I didn't hear myself on the nominal 435.150 at peak of
pass, unless rx is actually 435.300. I have the W-32 set for Full
Duplex, so receive mute wasn't active.
73 de Dennis KD7CAC
On May 28, 2008, at 9:23 AM, Andrew Glasbrenner wrote:
> You should try to listen with the squelch off, the satellite signal
> is usually not strong enough to crack it. It also might be that
> there was no one on during that pass. Could you hear anything on
> the 435.300 downlink?
>
> 73, Drew
>
> ----- Original Message ----- From: "Dennis Griffin"
> <eagleeyedennis(AT)yahoo.com>
> To: "Andrew Glasbrenner" <glasbrenner(AT)mindspring.com>
> Cc: <amsat-bb(AT)amsat.org>
> Sent: Wednesday, May 28, 2008 11:42 AM
> Subject: Re: [amsat-bb] AO-51 2nd repeater operational
>
>
>> Thanks, Drew. I tried it on a straight overhead pass with my IC-
>> W32 on high power, thru an Arrow II Satellite handheld antenna,
>> but no joy. The squelch did open for a few minutes during the
>> peak of the pass, but I was unable to discern any audio.
>>
>> 73 de Dennis KD7CAC
>> Scottsdale, AZ
>>
>>
>> On May 28, 2008, at 7:51 AM, Andrew Glasbrenner wrote:
>>
>>> 145.86 is the old 2m digital uplink. 145.88 is the 2nd repeater
>>> voice uplink.
>>>
>>> 73, Drew
>>>
>>> ----- Original Message ----- From: "Dennis Griffin"
>>> <eagleeyedennis(AT)yahoo.com>
>>> To: "Andrew Glasbrenner" <glasbrenner(AT)mindspring.com>
>>> Sent: Wednesday, May 28, 2008 10:48 AM
>>> Subject: Re: [amsat-bb] AO-51 2nd repeater operational
>>>
>>>
>>>> MacDoppler Pro has the tx as 145.860. Can you confirm which it
>>>> is? A good pass coming up here in my area.
>>>>
>>>> 73 de Dennis KD7CAC
>>>> Scottsdale, AZ
>>>>
>>>>
>>>> On May 28, 2008, at 6:47 AM, Andrew Glasbrenner wrote:
>>>>
>>>>> Just a reminder that the 2nd repeater is active on AO-51,
>>>>> 145.880 uplink and
>>>>> 435.150 downlink. It is not restricted to QRP this time, but
>>>>> we do ask that
>>>>> only FM voice be used. Those that have been reluctant to use
>>>>> the FM
>>>>> satellites should give it a try, there is no contention. Last
>>>>> night on the
>>>>> first east coast pass, there were only 3 stations the entire pass.
>>>>>
>>>>> 73, Drew KO4MA
>>>>> AMSAT VP Operations
>>>
>
------------------------------
Message: 2
Date: Wed, 28 May 2008 19:24:28 +0000 (GMT)
From: "pcalvi(AT)bluewin.ch" <pcalvi(AT)bluewin.ch>
Subject: [amsat-bb] JUBILEE and other frustrations
To: amsat-bb(AT)amsat.org
Message-ID:
<28323248.837621212002668903.JavaMail.webmail(AT)ps20zhh.bluewin.ch>
Content-Type: text/plain;charset="UTF-8"
Honestly, if somebody has put a 45 kg amateur satellite into a 1,500 km plus
orbit and has NOT included a
transponder,
then this hobby has really become a joke! What's the weight of a transponder
module? And the cost? What's the
problem
in giving us something more like a "real" satellite? (and this is said with
enormous love and affection for the old
girl - which I use daily - and plenty of respect for HamSat).
Yes - I am quite angry. We are kept in complete darkness as to real progress
and launch opportunities for P3E -
something I have repeatedly and completely uselessly complained about several
times on this BB. I find this
absolutely
incredible. I have repeatedly said that I have the utmost respect for the work
of AMSAT DL and I am quite keen to
support it financially, bit I cannot see any reason for this total blackout on
communication, which has been going
on
since the beginning of the project. I appreciate that AMSAT DL themselves must
be quite uncertain, but the DO TELL
US,
for God's sake! Keep us informed on negotiations, progress, prospects. That
fuels enthusiasm, attracts resources
and
somewhat cures frustration. We live on tiny bits of information - mostly
speculations and rumours. How is this
possible?
And now, talking about frustration, somebody invest considerable resources to
put a new bird in orbit and do not
include a transponder? Tell me that's not true, PLEASE.
73. Piero
________________________
Piero Calvi-Parisetti MM0TWX
currently also HB9DSU
for music, Ham Radio and more
visit http://www.chmusiq.com/ham
------------------------------
Message: 3
Date: Wed, 28 May 2008 22:45:08 +0200
From: "i8cvs" <domenico.i8cvs(AT)tin.it>
Subject: [amsat-bb] Re: Test Gear for 1.2/2.4Ghz Equipment
To: "John Henderson N4NAB" <jah(AT)ec.rr.com>, "AMSAT-BB"
<amsat-bb(AT)amsat.org>
Message-ID: <005401c8c103$b76a0360$0201a8c0(AT)tin.it>
Content-Type: text/plain; charset="iso-8859-1"
----- Original Message -----
From: "John Henderson N4NAB" <jah(AT)ec.rr.com>
To: <AMSAT-BB(AT)amsat.org>
Sent: Wednesday, May 28, 2008 2:59 PM
Subject: [amsat-bb] Test Gear for 1.2/2.4Ghz Equipment
> Need some advice on test gear, signal source, swr measurement for L and
S
> band. Just got 1.2 board for 910H and have unit on order for 2.4 from SSB.
> Home brewing antennas and need some way to check/adjust. My MFJ is only
good
> for up thru 70cm.
>
> John
>
> John Henderson N4NAB
>
> 212 Bayside Drive
>
> Cape Carteret, NC 28584
>
Hi John, N4NAB
To make with easy reliable measurements of the Incident Power ,Reflected
Power and SWR from 1 watt to 250 watt at 1260 MHz and from 1 watt to
25 watt at 2300 MHz I suggest you to buy a BIRD Thruline Model 43 RF
Directional Wattmeter with the approprate standard measuring elements
depending on your needs.
This unit is a professional instrument well know to all radio engineers and
you can move it with easy from the shack to the antennas only screwing two N
connectors.
Using the appropriate measuring elements you can extend the frequency range
from 0.45 to 2300 MHz
I have two BIRD 43 since 1976 and I am very happy with them.
73" de
i8CVS Domenico
------------------------------
Message: 4
Date: Wed, 28 May 2008 22:56:46 +0200
From: "i8cvs" <domenico.i8cvs(AT)tin.it>
Subject: [amsat-bb] Re: JUBILEE and other frustrations
To: "Piero Calvi-Parisetti" <pcalvi(AT)bluewin.ch>, "AMSAT-BB"
<amsat-bb(AT)amsat.org>
Message-ID: <009d01c8c105$57b5f940$0201a8c0(AT)tin.it>
Content-Type: text/plain; charset="iso-8859-1"
----- Original Message -----
From: <pcalvi(AT)bluewin.ch>
To: <amsat-bb(AT)amsat.org>
Sent: Wednesday, May 28, 2008 9:24 PM
Subject: [amsat-bb] JUBILEE and other frustrations
>
> Honestly, if somebody has put a 45 kg amateur satellite into a 1,500 km
plus orbit and has NOT included a
> transponder,
> then this hobby has really become a joke! What's the weight of a
transponder module? And the cost? What's the
> problem
> in giving us something more like a "real" satellite? (and this is said
with enormous love and affection for the old
> girl - which I use daily - and plenty of respect for HamSat).
>
> Yes - I am quite angry. We are kept in complete darkness as to real
progress and launch opportunities for P3E -
> something I have repeatedly and completely uselessly complained about
several times on this BB. I find this
> absolutely
> incredible. I have repeatedly said that I have the utmost respect for the
work of AMSAT DL and I am quite keen to
> support it financially, bit I cannot see any reason for this total
blackout on communication, which has been going
> on
> since the beginning of the project. I appreciate that AMSAT DL themselves
must be quite uncertain, but the DO TELL
> US,
> for God's sake! Keep us informed on negotiations, progress, prospects.
That fuels enthusiasm, attracts resources
> and
> somewhat cures frustration. We live on tiny bits of information - mostly
speculations and rumours. How is this
> possible?
>
> And now, talking about frustration, somebody invest considerable resources
to put a new bird in orbit and do not
> include a transponder? Tell me that's not true, PLEASE.
>
> 73. Piero
> ________________________
> Piero Calvi-Parisetti MM0TWX
> currently also HB9DSU
> for music, Ham Radio and more
> visit http://www.chmusiq.com/ham
>
Hi Piero, HB9DSU
The future will be again bright for all of us and for the Amateur Satellite
Service only when tanks to AMSAT-DL P3-E will be placed in orbit.
Be patient and prepare for the future.
73" de
i8CVS Domenico
------------------------------
Message: 5
Date: Wed, 28 May 2008 19:55:52 -0000
From: "Pedro Cruz" <pccu2jx(AT)sapo.pt>
Subject: [amsat-bb] 1,2g ts2000 Module
To: <amsat-bb(AT)amsat.org>
Message-ID: <D244BBBA3F57455590B89492418F8751(AT)pedro>
Content-Type: text/plain; charset="iso-8859-1"
HI to all
I?m planing order the 1,2G for my TS2000 , any one as instal it and knows and
problem on this instalation (in kenwood Dealer).
Best 73 !
Pedro Cruz - cu2jx
------------------------------
Message: 6
Date: Wed, 28 May 2008 14:06:08 -0700 (PDT)
From: "Patrick STODDARD \(WD9EWK/VA7EWK\)" <amsat-bb(AT)wd9ewk.net>
Subject: [amsat-bb] WD9EWK from DM34 and DM25/DM35, 31 May
To: amsat-bb(AT)amsat.org
Message-ID: <795403.58211.qm(AT)web56101.mail.re3.yahoo.com>
Content-Type: text/plain; charset=us-ascii
Hi!
On Saturday, 31 May 2008, I will have an AMSAT table at the hamfest
in Prescott, Arizona (grid DM34). More information about the hamfest
is available from these links:
http://www.w7yrc.org/ham_fest.htm
http://www.vvara.org/hamfest.html
During the morning, I will have on-air demonstrations using the
AO-51 satellite. There is a nice pass to the east just before
the start time for this hamfest (0800 local/1500 UTC) that I will
be on, as well as the subsequent western pass, using my callsign
WD9EWK.
After the hamfest, I will drive toward Kingman in northwestern
Arizona (on I-40 and old US 66) to find a good spot on the
DM25/DM35 grid boundary near that city. I plan on being there
for AO-51 passes Saturday evening (early Sunday, UTC) both to
the east and west, for anyone interested in making a contact with
those grids.
I am not sure if I will be on for AO-27 or SO-50 passes during
the afternoon or early evening on Saturday. I will review pass
times for those satellites, to see if those passes work with my
travel plans.
73!
Patrick WD9EWK/VA7EWK
http://www.wd9ewk.net/
------------------------------
Message: 7
Date: Wed, 28 May 2008 23:37:20 +0200
From: "Francesco Grappi" <f.grappi(AT)tin.it>
Subject: [amsat-bb] I: JUBILEE and other frustrations
To: <amsat-bb(AT)amsat.org>
Message-ID: <D97FC06F574141C093CB0306AE0063EE(AT)master>
Content-Type: text/plain; charset="iso-8859-1"
..Yes Piero..
I agree with you...
73 Francesco IW4DVZ
-----Messaggio originale-----
Da: amsat-bb-bounces(AT)amsat.org [mailto:amsat-bb-bounces(AT)amsat.org] Per
conto
di pcalvi(AT)bluewin.ch
Inviato: mercoled? 28 maggio 2008 21.24
A: amsat-bb(AT)amsat.org
Oggetto: [amsat-bb] JUBILEE and other frustrations
Honestly, if somebody has put a 45 kg amateur satellite into a 1,500 km plus
orbit and has NOT included a
transponder,
then this hobby has really become a joke! What's the weight of a transponder
module? And the cost? What's the
problem
in giving us something more like a "real" satellite? (and this is said with
enormous love and affection for the old
girl - which I use daily - and plenty of respect for HamSat).
Yes - I am quite angry. We are kept in complete darkness as to real progress
and launch opportunities for P3E -
something I have repeatedly and completely uselessly complained about
several times on this BB. I find this
absolutely
incredible. I have repeatedly said that I have the utmost respect for the
work of AMSAT DL and I am quite keen to
support it financially, bit I cannot see any reason for this total blackout
on communication, which has been going
on
since the beginning of the project. I appreciate that AMSAT DL themselves
must be quite uncertain, but the DO TELL
US,
for God's sake! Keep us informed on negotiations, progress, prospects. That
fuels enthusiasm, attracts resources
and
somewhat cures frustration. We live on tiny bits of information - mostly
speculations and rumours. How is this
possible?
And now, talking about frustration, somebody invest considerable resources
to put a new bird in orbit and do not
include a transponder? Tell me that's not true, PLEASE.
73. Piero
________________________
Piero Calvi-Parisetti MM0TWX
currently also HB9DSU
for music, Ham Radio and more
visit http://www.chmusiq.com/ham
_______________________________________________
Sent via AMSAT-BB(AT)amsat.org. 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: 8
Date: Wed, 28 May 2008 15:20:45 -0700
From: "Jeff Moore" <tnetcenter(AT)gmail.com>
Subject: [amsat-bb] Re: AO-51 2nd repeater operational
To: <amsat-bb(AT)amsat.org>
Message-ID: <016e01c8c111$13b34660$088464d0(AT)TNTCENTER>
Content-Type: text/plain; charset="iso-8859-1"
The 435.300 freq is the primary FM downlink channel which is almost always
crowded with signals. I think the suggestion was to try listening to that
to see if you're hearing the satellite. The 2nd channel downlink is 435.150
(tune for doppler) and leave the squelch off.
Jeff Moore -- KE7ACY
CN94
----- Original Message -----
From: "Dennis Griffin" <eagleeyedennis(AT)yahoo.com>
435.300 downlink? I thought it was 435.150.
[snip]
73 de Dennis KD7CAC
------------------------------
Message: 9
Date: Wed, 28 May 2008 18:44:11 -0400
From: "Bill Bruno" <billbruno(AT)earthlink.net>
Subject: [amsat-bb] 70cm Mast mounted preamp
To: "Amsat-bb(AT)amsat.org" <amsat-bb(AT)amsat.org>
Message-ID: <007301c8c114$593177e0$0300a8c0(AT)billslaptop>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
SSB SP-7000 Mast mounted preamp for sale, with manual $190, and Bias T
DCC-12, with DC cable $45. Specs can be found on ssbusa.com website. If
interested please contact me off list.
Bill KB2RC
------------------------------
Message: 10
Date: Wed, 28 May 2008 17:12:39 -0500
From: "Ronald G. Parsons" <w5rkn(AT)amsat.org>
Subject: [amsat-bb] Re: SatPC32 12.8 released
To: "amsat-bb" <amsat-bb(AT)amsat.org>
Message-ID: <E445AD6A6F1146E6969D6724B144E1B4(AT)HPm9080n>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
The version of 12.8 for ISS (SatPC32ISS) does not start with the
QTH/Registration dialog. I can find no way to enter my Lat/Long.
I did follow the instructions for upgrading from 12.7.
Also there is no Setup menu.
Is there something I am missing?
Ron W5RKN
> Date: Wed, 28 May 2008 08:30:07 -0500
> From: "Alan P. Biddle" <APBIDDLE(AT)UNITED.NET>
> Subject: [amsat-bb] Re: SatPC32 12.8 released
> To: <amsat-bb(AT)amsat.org>
> Message-ID: <DC0F8D0D76ED4BE99254D9C2BE9F9083(AT)WA4SCA>
> Content-Type: text/plain; charset="us-ascii"
>
> NB, this is one of those upgrades which can NOT be simply installed over
> the
> previous version.
>
> ============================================================================
> ===
> SatPC32 V. 12.8 contains significant changes regarding the storage of data
> files.
> Previous program versions stored program data in the SatPC32 program
> folder
> and
> its sub folders. Beginning with version 12.8 SatPC32 stores program
> application
> data in a sub folder 'SatPC32' of the Windows system folder for
> application
> data
> (the path of that folder is displayed in the foot line of the menu
> 'Satellites').
>
> Therefore don't install V. 12.8 over a previous installation! That would
> leave
> all previous data files in the SatPC32 program folder and its sub folders.
> If you want to keep an old installation make a backup copy of the entire
> SatPC32 program folder before you uninstall the previous version. Rename
> the
> copy 'SatPC32_127' or similar. In this folder you can run the old programs
> and look for your previous program configuration if necessary.
>
> Then uninstall the previous version. The Windows uninstaller will possibly
> leave some files and sub folders in the SatPC32 program folder. Remove
> these
> files
> and sub folders with Windows Explorer or another file manager.
>
> Then start the new setup program and follow the instructions.
> ============================================================================
> ===
>
>
> Alan
> WA4SCA
>
>
------------------------------
Message: 11
Date: Wed, 28 May 2008 19:02:00 -0400
From: "Bill Bruno" <billbruno(AT)earthlink.net>
Subject: [amsat-bb] 70cm mast mounted preamp for sale
To: "Amsat-bb(AT)amsat.org" <amsat-bb(AT)amsat.org>
Message-ID: <008d01c8c116$d6171f60$0300a8c0(AT)billslaptop>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
SSB SP-7000 Mast mounted preamp for sale, with manual $190, and Bias T
DCC-12, with DC cable $45. Specs can be found on ssbusa.com website. If
interested please contact me off list.
Bill KB2RC
------------------------------
Message: 12
Date: Wed, 28 May 2008 19:10:56 -0400
From: "John Price" <n4qwf1(AT)gmail.com>
Subject: [amsat-bb] RS-30 receive
To: "amsat-bb(AT)amsat.org" <amsat-bb(AT)amsat.org>
Message-ID:
<8d1b8e80805281610tb25b571kda3f19f05cd9f8c6(AT)mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
Just copied the last pass of the satellite RS-30. The CW signal was
very strong here in FM07. Copied LOS right down to 5 degrees. The
doppler was about 5 kc higher than expected. Looked to be about
435.317 center. Sure wish that thing could talk. 73's << John
--
N4QWF Amateur Radio Operator
AO-7,AO-16,AO-27,SO-50,AO-51,VO-52
Internet N4QWF(AT)AMSAT.ORG
Formerly KC4AHW VK3FEZ
Amsat Member #27845
DXCC #33,478
VUCC SAT #135
WAS SAT #296
51 on 51 #13
LON -79.25 LAT 37.45 Grid FM07
>From the Foothills of the Blueridge
*Life should not be a journey to the grave with the intention of
arriving safely in a pretty and well preserved body, but rather to
skid in broadside, thoroughly used up, totally worn out, and loudly
proclaiming - "WOW, What a ride!"
------------------------------
Message: 13
Date: Thu, 29 May 2008 00:17:28 +0100
From: John Wright <ham(AT)g4dmf.co.uk>
Subject: [amsat-bb] Re: JUBILEE and other frustrations
To: amsat-bb(AT)amsat.org
Message-ID: <0ML21M-1K1Utd14j4-0000gN(AT)mrelayeu.kundenserver.de>
Content-Type: text/plain; charset="us-ascii"; format=flowed
>>SNIP
> > Honestly, if somebody has put a 45 kg amateur satellite into a 1,500 km
>plus orbit and has NOT included a
> > transponder,
<<SNIP
There seems to be a proliferation of satellites using the Amateur
bands as cheap down link frequencies, and using Radio Amateurs as a
cheap way of collecting their data. It is MY personal belief that a
satellite should only use our hard-earned and much coveted
frequencies if they REALLY do carry an Amateur Radio payload... I.E.
a Transponder! , or, at the end of their commercial life, should be
put to real amateur use, I.E. a Transponder, promised several times
but not often delivered.
OK there are many out there who get satisfaction from getting signals
from anything that is orbiting, to them, I raise my hat
BUT.. if it is in an amateur band, it should be a REAL amateur satellite.
This is my view, and I stand here to be shot down.....
------------------------------
Message: 14
Date: Wed, 28 May 2008 18:44:18 -0500
From: "Alan P. Biddle" <APBIDDLE(AT)UNITED.NET>
Subject: [amsat-bb] Re: SatPC32 12.8 released
To: "'amsat-bb'" <amsat-bb(AT)amsat.org>
Message-ID: <57B91B84E28542F49E25D99BB44CCB9C(AT)WA4SCA>
Content-Type: text/plain; charset="us-ascii"
Ron,
SATPCISS, like the supplemental programs, "inherits" all the basic data from
the Setup process in SATPC32. I did the full install, configured SATPC32,
and SATPCISS came up fine. There are a couple of additional options to
tweak, as is the case with most of the supplemental programs.
Alan
WA4SCA
------------------------------
Message: 15
Date: Wed, 28 May 2008 17:43:03 -0700
From: Dennis Griffin <eagleeyedennis(AT)yahoo.com>
Subject: [amsat-bb] Re: AO-51 2nd repeater operational
To: Jeff Moore <tnetcenter(AT)gmail.com>
Cc: amsat-bb(AT)amsat.org
Message-ID: <087B59E6-A9D3-46BD-ACA9-DA20E94F2388(AT)yahoo.com>
Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed
Thanks for the reply, Jeff. I only had half the picture when I asked
this, earlier today, until Drew was kind enough to get me on track.
But now, I'm curious - if the first channel is so busy, why isn't the
second used more? Did it only recently became available? Can they
not operate concurrently? Does channel 1 have better ears &/or more
power? I'll listen in on WD9EWK's activity this coming Saturday and
maybe I'll learn a thing or two more.
73 de Dennis KD7CAC
On May 28, 2008, at 3:20 PM, Jeff Moore wrote:
> The 435.300 freq is the primary FM downlink channel which is almost
> always
> crowded with signals. I think the suggestion was to try listening
> to that
> to see if you're hearing the satellite. The 2nd channel downlink
> is 435.150
> (tune for doppler) and leave the squelch off.
>
> Jeff Moore -- KE7ACY
> CN94
>
> ----- Original Message -----
> From: "Dennis Griffin" <eagleeyedennis(AT)yahoo.com>
>
>
> 435.300 downlink? I thought it was 435.150.
>
> [snip]
> 73 de Dennis KD7CAC
------------------------------
Message: 16
Date: Wed, 28 May 2008 23:21:19 -0300
From: "Bruce Robertson" <ve9qrp(AT)gmail.com>
Subject: [amsat-bb] Re: JUBILEE and other frustrations
To: "John Wright" <ham(AT)g4dmf.co.uk>
Cc: AMSAT <amsat-bb(AT)amsat.org>
Message-ID:
<49657a760805281921u53551d45pc87a36e76760ada(AT)mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
On Wed, May 28, 2008 at 8:17 PM, John Wright <ham(AT)g4dmf.co.uk> wrote:
> >>SNIP
>
>
>> > Honestly, if somebody has put a 45 kg amateur satellite into a 1,500 km
>>plus orbit and has NOT included a
>> > transponder,
>
> <<SNIP
>
> There seems to be a proliferation of satellites using the Amateur
> bands as cheap down link frequencies, and using Radio Amateurs as a
> cheap way of collecting their data. It is MY personal belief that a
> satellite should only use our hard-earned and much coveted
> frequencies if they REALLY do carry an Amateur Radio payload... I.E.
> a Transponder! , or, at the end of their commercial life, should be
> put to real amateur use, I.E. a Transponder, promised several times
> but not often delivered.
>
> OK there are many out there who get satisfaction from getting signals
> from anything that is orbiting, to them, I raise my hat
> BUT.. if it is in an amateur band, it should be a REAL amateur satellite.
>
> This is my view, and I stand here to be shot down.....
>
John:
I'm not going to shoot you down. With some moderation, your views
represent many of us. But I want to suggest another way forward, one
that is audible on our radios right now. Delfi C3 is a project that
makes a fair trade between the college projects' desire for data from
our unequaled network of receiving stations and the amateurs' desire
for a transponder. Even if a few other cubesats go up at the same time
-- and I have to confess that as a university professor (though in the
humanities), I love to collect telemetry from these, because I can
imagine the enthusiastic young people behind them -- even if these
others without a transponder go up at the same time, we stand to
benefit greatly (admittedly, in LEO) from this sort of trade-off.
I understand William PE1RAH is working on a transponder design that
will fit within the cubesat format, too.
Here's my optimistic summary (again, apropos LEO). Cubesats have
created a low-cost, frequent ride to space. The experimenters have
developed a standard ejection system, and a well-known set of
parameters for power, etc. We know a linear transponder can ride on
one of these. At the same time, I'd say that on the whole our
groundstations are improving (with antenna design and low-noise
preamps) that we can compensate slightly for lower power in space. We
should get behind these cubesat projects and be in the position to
offer a SDX transponder that can, during their science phase, be used
as a data downlink. Here: it's yours. Just let us turn on the
transponder in a year or so.
I'll end with a challenge to continue this thread. Cubesats tend to be
launched into low LEO orbits. What experimental schemes could be put
on board to boost their orbits, say to the height of FO-29? The ION
cubesat was meant to look into alternate propulsion. These probably
should not be tried-and-true systems, since such would not be of
interest to the cubesat research teams. We offer the comms, we cheer
on the science, and even if the boost engine doesn't work, we have
another low LEO transponder.
73, Bruce
VE9QRP
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End of AMSAT-BB Digest, Vol 3, Issue 268
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