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CX2SA > SATDIG 08.01.10 10:23l 960 Lines 31736 Bytes #999 (0) @ WW
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From: CX2SA@CX2SA.LAV.URY.SA
To : SATDIG@WW
Today's Topics:
1. Re: Winter Project (Roger Kolakowski)
2. Re: Winter Project (Roger Kolakowski)
3. SEEDS - Depuri Near Collision ? (Trevor .)
4. Re: Winter Project (Nigel Gunn G8IFF/W8IFF)
5. Re: SEEDS - Depuri Near Collision ? (ON5UE)
6. Re: Winter Project (Roger Kolakowski)
7. Re: Winter Project (Roger Kolakowski)
8. Re: probably simple (Greg D.)
9. Re: Winter Project (Rocky Jones)
10. Re: Winter Project (Rocky Jones)
11. Re: probably simple (Andrew Glasbrenner)
12. Re: probably simple (Greg D.)
13. Re: probably simple (Bob- W7LRD)
14. Re: probably simple (Greg D.)
15. IC 910H query (Louis House)
16. Re: probably simple (Larry Gerhardstein)
17. Re: HO-68 BBS upload!! (Andrew Rich)
----------------------------------------------------------------------
Message: 1
Date: Thu, 7 Jan 2010 15:59:58 -0500
From: "Roger Kolakowski" <rogerkola@xxx.xxx>
Subject: [amsat-bb] Re: Winter Project
To: <KC9MLN@xxxxx.xxx>, <amsat-bb@xxxxx.xxx>
Message-ID: <002c01ca8fdc$5fe06900$0200a8c0@xxxxxxxx>
Content-Type: text/plain; charset="iso-8859-1"
You didn't say what band or what mode but you could us a couple of FM Prog
Line dual 6146 strips to remove the few parts and have a tube that you can
beat on and still replace with "inexpensive" new tubes or NOS.
If you were just running FM, you could just whip up an input circuit and use
the strip itself as you amp.
Won't take a winter though...
Roger
WA1KAT
----- Original Message -----
From: "Douglas Anoman" <danoman@xxxxx.xxxxxxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Sent: Thursday, January 07, 2010 10:56 AM
Subject: [amsat-bb] Winter Project
>
> I'm looking for a winter project can any one point me in the direction of
a 2 meter tube amp nothing crazy about 25-50 out, 1-10 in. I have never used
or played with a tube circuit so i thougt winter why not. Thanks 73
>
> Thank You
> Douglas Anoman
> KC9MLN
> KC9MLN@xxxxx.xxx
> Amsat #37043
>
>
>
>
>
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
>
------------------------------
Message: 2
Date: Thu, 7 Jan 2010 16:02:11 -0500
From: "Roger Kolakowski" <rogerkola@xxx.xxx>
Subject: [amsat-bb] Re: Winter Project
To: <KC9MLN@xxxxx.xxx>, <amsat-bb@xxxxx.xxx>
Message-ID: <003f01ca8fdc$aedee220$0200a8c0@xxxxxxxx>
Content-Type: text/plain; charset="iso-8859-1"
Ah...I now see that you wanted the amp for 2 meters...eyes are getting old
or I have been staring at RF tuning adjustments too long...
A "GE Prog Line" will drop right down for you.
Roger
Wa1KAT
----- Original Message -----
From: "Douglas Anoman" <danoman@xxxxx.xxxxxxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Sent: Thursday, January 07, 2010 10:56 AM
Subject: [amsat-bb] Winter Project
>
> I'm looking for a winter project can any one point me in the direction of
a 2 meter tube amp nothing crazy about 25-50 out, 1-10 in. I have never used
or played with a tube circuit so i thougt winter why not. Thanks 73
>
> Thank You
> Douglas Anoman
> KC9MLN
> KC9MLN@xxxxx.xxx
> Amsat #37043
>
>
>
>
>
> _______________________________________________
> 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: 3
Date: Thu, 7 Jan 2010 18:39:55 +0000 (GMT)
From: "Trevor ." <m5aka@xxxxx.xx.xx>
Subject: [amsat-bb] SEEDS - Depuri Near Collision ?
To: amsat-bb@xxxxx.xxx
Message-ID: <767699.89908.qm@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=utf-8
>From the JARL website http://tinyurl.com/JapanJARL
http://translate.google.co.uk/translate?u=http%3A%2F%2Fwww.jarl.or.jp%2F&sl=ja
&tl=en&hl=en&ie=UTF-8
"The saying, SEEDS is to suggest the possibility of a collision with Depuri"
73 Trevor M5AKA
------------------------------
Message: 4
Date: Thu, 07 Jan 2010 21:43:39 +0000
From: Nigel Gunn G8IFF/W8IFF <nigel@xxxxx.xxx>
Subject: [amsat-bb] Re: Winter Project
To: Roger Kolakowski <rogerkola@xxx.xxx>
Cc: KC9MLN@xxxxx.xxxx amsat-bb@xxxxx.xxx
Message-ID: <4B46558B.9030200@xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8; format=flowed
Yes he did.
He specified 2 meter, that's 145MHZ to most of us.
On 07-Jan-10 20:59, Roger Kolakowski wrote:
> You didn't say what band or what mode
------------------------------
Message: 5
Date: Thu, 7 Jan 2010 23:36:31 +0100
From: "ON5UE" <on5ue@xxxxxx.xx>
Subject: [amsat-bb] Re: SEEDS - Depuri Near Collision ?
To: <amsat-bb@xxxxx.xxx>
Message-ID: <91FAA8EDAC2147D1A46982C04F2F8A15@xxxxxxxxxxx>
Content-Type: text/plain; charset="us-ascii"
The near miss was at January 7, 2010 08:02:30UTC
SEEDS is still alive and kicking. Hear the beacon load and clear at 22:30utc.
73
Dan ON5UE
-----Oorspronkelijk bericht-----
Van: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx Namens
Trevor .
Verzonden: donderdag 7 januari 2010 19:40
Aan: amsat-bb@xxxxx.xxx
Onderwerp: [amsat-bb] SEEDS - Depuri Near Collision ?
>From the JARL website http://tinyurl.com/JapanJARL
http://translate.google.co.uk/translate?u=http%3A%2F%2Fwww.jarl.or.jp%2F&sl=ja
&t
l=en&hl=en&ie=UTF-8
"The saying, SEEDS is to suggest the possibility of a collision with Depuri"
73 Trevor M5AKA
_______________________________________________
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!
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------------------------------
Message: 6
Date: Thu, 7 Jan 2010 17:53:42 -0500
From: "Roger Kolakowski" <rogerkola@xxx.xxx>
Subject: [amsat-bb] Re: Winter Project
To: "wrb" <wrb@xxxxxxxxxxxxx.xxx>, <KC9MLN@xxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Message-ID: <000a01ca8fec$443eca60$0200a8c0@xxxxxxxx>
Content-Type: text/plain; charset="iso-8859-1"
"...I'm looking for a winter project can any one point me in the direction
of a 2 meter tube amp nothing crazy about 25-50 out, 1-10 in. I have never
used or played with a tube circuit so i thougt winter why not..."
I believe the power supply will be your biggest obsticle...in the "old
days," "suitable" transformers were found in every TV set (sometimes you had
to use 2 ;-)
With everything now solid state, and the surplus market for higher voltage
stuff shrinking, your power supply will probably cost more than the
amp...unless you can grab one from someone else's abandoned project. Your
output requirements are quite conservative so that may be a less costly
solution.
Roger
WA1KAT
----- Original Message -----
From: "wrb" <wrb@xxxxxxxxxxxxx.xxx>
To: <KC9MLN@xxxxx.xxx>
Cc: <amsat-bb@xxxxx.xxx>
Sent: Thursday, January 07, 2010 11:28 AM
Subject: [amsat-bb] Re: Winter Project
> I would try to locate old QSTs or Amateur Radio Handbooks that contained
> such circuits. Tubes such as 6146, 829, etc. were good candidates. Also
> the 4x/4CX150 would give up to 100+ out with just a few watts in. Newer
> handbooks or magazines still provide you with he necessary theory to
> build one from scratch. Building a tube amp is quite simple, just need
> to have 300 - 1000 volts dc supply based on tube and power out. Also,
> usually a 6.3vc transformer for filaments. Nothing wrong with tube amps.
> I have an old Johnson 6n2 unit that runs about 150 watts. Neat old rig.
> Find an old rig as I mentioned above and go online to the various manual
> websites and obtain the manual for an old rig. You can use that as your
> example.
>
> Reid, W4UPD
>
>
> Douglas Anoman wrote:
> > I'm looking for a winter project can any one point me in the direction
of a 2 meter tube amp nothing crazy about 25-50 out, 1-10 in. I have never
used or played with a tube circuit so i thougt winter why not. Thanks 73
> >
> > Thank You
> > Douglas Anoman
> > KC9MLN
> > KC9MLN@xxxxx.xxx
> > Amsat #37043
------------------------------
Message: 7
Date: Thu, 7 Jan 2010 18:01:58 -0500
From: "Roger Kolakowski" <rogerkola@xxx.xxx>
Subject: [amsat-bb] Re: Winter Project
To: <amsat-bb@xxxxx.xxx>
Message-ID: <000c01ca8fed$6a8fa3a0$0200a8c0@xxxxxxxx>
Content-Type: text/plain; charset="iso-8859-1"
Actually, 2 Meters is 149.896229 MHz...since we are picking nits...
Roger
WA1KAT
------------------------------
Message: 8
Date: Thu, 7 Jan 2010 19:34:12 -0800
From: "Greg D." <ko6th_greg@xxxxxxx.xxx>
Subject: [amsat-bb] Re: probably simple
To: <glasbrenner@xxxxxxxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Message-ID: <BLU133-W1796B42E95550E86A2EBCCA9700@xxx.xxx>
Content-Type: text/plain; charset="iso-8859-1"
Hi Drew,
SatPC32 is probably an excellent program (I'm on Linux here, so can't use
it), and if you've got the automation available, that's certainly the best
way to go. And, by definition, the lower the elevation, the farther away
the satellite is, so your DX contacts are going to be at the edges of the
pass.
But any pass where you are really stretching the footprint is going to be a
low elevation pass. The more you stretch, the lower the pass. In the
limit, I think Bob's ultimate pass has a peak at .001-degrees for both
stations. If you're doing that, then you're at TCA, and zero doppler.
That's all I meant to convey,
Greg KO6TH
> Date: Thu, 7 Jan 2010 05:53:13 -0500
> From: glasbrenner@xxxxxxxxxx.xxx
> To: ko6th_greg@xxxxxxx.xxx
> CC: w7lrd@xxxxxxx.xxxx amsat-bb@xxxxx.xxx
> Subject: Re: [amsat-bb] Re: probably simple
>
> Greg D. wrote:
> > Hi Bob,
> >
> > Whatever the satellite, if you're trying to stretch the footprint, your
sked is always going to be at the peak of elevation, for that fleeting
moment when the satellite is a few degrees above the horizon. That means
that you're always going to be at zero doppler shift, and the math will
always be the same. Find yourself once at TCA on any pass, and lock them
in. The numbers will be the same for your sked.
> >
> > Good luck,
> >
> > Greg KO6TH
> >
> >
> I wouldn't agree with that statement at all. Most of my long haul
> contacts on AO-7, FO-20 and 29, and now HO-68, are right after AOS or
> just before LOS, certainly not at TCA. Use my recent QSOs on HO-68 with
> Argentina as an example. Even when I work Europe on AO-7 it is at the
> beginning or end of a pass...not the middle.
>
> Bob, SatPC32 will show you the frequency with Doppler shift, and the
> Doppler shift. A little subtraction or addition and you have what you want.
>
> 73, Drew KO4MA
_________________________________________________________________
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------------------------------
Message: 9
Date: Thu, 7 Jan 2010 23:20:16 -0600
From: Rocky Jones <orbitjet@xxxxxxx.xxx>
Subject: [amsat-bb] Re: Winter Project
To: <kc9mln@xxxxx.xxx>, Amsat BB <amsat-bb@xxxxx.xxx>
Message-ID: <COL106-W5F445D3FE82AD50A6E0C6D6700@xxx.xxx>
Content-Type: text/plain; charset="Windows-1252"
my "project" along your lines came from the third edition of the ARRL VHF
handbook...page 102 it is an 829B amp for 144mhz. I've built a couple of
them over the years...and they all played pretty easy just following the
instructions in the article. There are some other "'easy amps" the 6360 was
a little hard to make play (it was my first OSCAR amp) but a good learning
experience. I can (it will take a few days) scan some of this in and ship
it to you if you would find that helpful. Power supplies are a little
tricky. Fair has some transformers but they are "ouch"...I prowl garage
sales and find OLD really old tv's that have tubes in them and are toast.
the transformer is usually "OK".
The other day I had the Drake ML-2 and the 829 up (with a 40673 preamp) up
as the space station roared over...it was kind of fun with the kids to have
a back and forth with it as it flew over all with gear that is a few decades
old...
anyway let me know if the copies would help Robert WB5MZO
> From: danoman@xxxxx.xxxxxxxx.xxx
> To: amsat-bb@xxxxx.xxx
> Date: Thu, 7 Jan 2010 15:56:29 +0000
> Subject: [amsat-bb] Winter Project
>
>
> I'm looking for a winter project can any one point me in the direction of
a 2 meter tube amp nothing crazy about 25-50 out, 1-10 in. I have never used
or played with a tube circuit so i thougt winter why not. Thanks 73
>
> Thank You
> Douglas Anoman
> KC9MLN
> KC9MLN@xxxxx.xxx
> Amsat #37043
>
>
>
>
>
> _______________________________________________
> 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
_________________________________________________________________
Hotmail: Trusted email with Microsoft?s powerful SPAM protection.
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------------------------------
Message: 10
Date: Thu, 7 Jan 2010 23:21:53 -0600
From: Rocky Jones <orbitjet@xxxxxxx.xxx>
Subject: [amsat-bb] Re: Winter Project
To: <rogerkola@xxx.xxx>, <kc9mln@xxxxx.xxx>, Amsat BB
<amsat-bb@xxxxx.xxx>
Message-ID: <COL106-W29A13A75174AC525D78C15D6700@xxx.xxx>
Content-Type: text/plain; charset="Windows-1252"
Nothing wrong with the old Prog line...still the Bay Area repeater backup
machine and have a couple here at the house! Robert WB5MZO
> From: rogerkola@xxx.xxx
> To: KC9MLN@xxxxx.xxxx amsat-bb@xxxxx.xxx
> Date: Thu, 7 Jan 2010 16:02:11 -0500
> Subject: [amsat-bb] Re: Winter Project
>
> Ah...I now see that you wanted the amp for 2 meters...eyes are getting old
> or I have been staring at RF tuning adjustments too long...
>
> A "GE Prog Line" will drop right down for you.
>
> Roger
> Wa1KAT
> ----- Original Message -----
> From: "Douglas Anoman" <danoman@xxxxx.xxxxxxxx.xxx>
> To: <amsat-bb@xxxxx.xxx>
> Sent: Thursday, January 07, 2010 10:56 AM
> Subject: [amsat-bb] Winter Project
>
>
> >
> > I'm looking for a winter project can any one point me in the direction of
> a 2 meter tube amp nothing crazy about 25-50 out, 1-10 in. I have never used
> or played with a tube circuit so i thougt winter why not. Thanks 73
> >
> > Thank You
> > Douglas Anoman
> > KC9MLN
> > KC9MLN@xxxxx.xxx
> > Amsat #37043
> >
> >
> >
> >
> >
> > _______________________________________________
> > 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
_________________________________________________________________
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------------------------------
Message: 11
Date: Fri, 08 Jan 2010 00:30:44 -0500
From: Andrew Glasbrenner <glasbrenner@xxxxxxxxxx.xxx>
Subject: [amsat-bb] Re: probably simple
To: "Greg D." <ko6th_greg@xxxxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Message-ID: <4B46C304.9070106@xxxxxxxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
>
> But any pass where you are really stretching the footprint is going to
> be a low elevation pass. The more you stretch, the lower the pass.
> In the limit, I think Bob's ultimate pass has a peak at .001-degrees
> for both stations. If you're doing that, then you're at TCA, and zero
> doppler.
>
> That's all I meant to convey,
>
> Greg KO6TH
I understand, but with all due respect your assumption is incorrect that
long distance QSOs are always at TCA and zero Doppler, even
theoretically . This is only the case when the two stations are at near
right angles to the track of the satellite.
Use the following example. If I want to work LU5BOJ/O in FG75 from EL88
on HO-68, my only windows are at either LOS or AOS, depending on whether
it is an ascending or descending pass. Neither pass will be a low pass
for either station, and neither QSO will occur at TCA or zero Doppler.
In Bob's case, let's look at his next possible window with Paul, 2E1EUB
in IO92. Bob is in CN76. At the beginning of the 1 minute window
tomorrow at 1251Z, Bob's Doppler shift on 432 is -3.68 khz.
On the next mutual window at 1452Z, the beginning Doppler is -7.93 khz.
On the next, at 2020Z, it's -8.3 khz. None of these windows are over 2
degrees elevation, and none are at TCA for either station.
When you have 60s to make the QSO, being right dead on frequency is
essential.
Respectfully,
Drew KO4MA
------------------------------
Message: 12
Date: Thu, 7 Jan 2010 21:41:45 -0800
From: "Greg D." <ko6th_greg@xxxxxxx.xxx>
Subject: [amsat-bb] Re: probably simple
To: <glasbrenner@xxxxxxxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Message-ID: <BLU133-W26D17B4DF26B4F10F3AFEA9700@xxx.xxx>
Content-Type: text/plain; charset="iso-8859-1"
Hi Drew,
Oh, my. You are correct; I was picturing a satellite running between two
stations, versus running overhead from one and on to the other. In that
case, in the limit, one station would be at AOS, and the other at LOS, and
neither at zero doppler.
Sorry, and thanks for your patience!
Greg KO6TH
> Date: Fri, 8 Jan 2010 00:30:44 -0500
> From: glasbrenner@xxxxxxxxxx.xxx
> To: ko6th_greg@xxxxxxx.xxx
> CC: w7lrd@xxxxxxx.xxxx amsat-bb@xxxxx.xxx
> Subject: Re: [amsat-bb] Re: probably simple
>
>
> >
> >
> > But any pass where you are really stretching the footprint is going to
> > be a low elevation pass. The more you stretch, the lower the pass.
> > In the limit, I think Bob's ultimate pass has a peak at .001-degrees
> > for both stations. If you're doing that, then you're at TCA, and zero
> > doppler.
> >
> > That's all I meant to convey,
> >
> > Greg KO6TH
> I understand, but with all due respect your assumption is incorrect that
> long distance QSOs are always at TCA and zero Doppler, even
> theoretically . This is only the case when the two stations are at near
> right angles to the track of the satellite.
>
> Use the following example. If I want to work LU5BOJ/O in FG75 from EL88
> on HO-68, my only windows are at either LOS or AOS, depending on whether
> it is an ascending or descending pass. Neither pass will be a low pass
> for either station, and neither QSO will occur at TCA or zero Doppler.
>
> In Bob's case, let's look at his next possible window with Paul, 2E1EUB
> in IO92. Bob is in CN76. At the beginning of the 1 minute window
> tomorrow at 1251Z, Bob's Doppler shift on 432 is -3.68 khz.
>
> On the next mutual window at 1452Z, the beginning Doppler is -7.93 khz.
> On the next, at 2020Z, it's -8.3 khz. None of these windows are over 2
> degrees elevation, and none are at TCA for either station.
>
> When you have 60s to make the QSO, being right dead on frequency is
> essential.
>
> Respectfully,
> Drew KO4MA
_________________________________________________________________
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------------------------------
Message: 13
Date: Fri, 8 Jan 2010 05:58:39 +0000 (UTC)
From: Bob- W7LRD <w7lrd@xxxxxxx.xxx>
Subject: [amsat-bb] Re: probably simple
To: Andrew Glasbrenner <glasbrenner@xxxxxxxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Message-ID:
<646095242.8676491262930319557.JavaMail.root@xxxxxxx.xxxxxxxxxx.xx.xxxx.xxxxxx
x.xxx>
Content-Type: text/plain; charset=utf-8
Hi Greg, Drew, etc
This conversation is starting to make my head hurt!? My example is to
connect with some of our European friends.? Some of them I share maybe a 60
second window, with PA1TNO it is less than 30 seconds.? I have had several
false starts in that I heard Paul 2E1EUB, by the time I located my downlink
on his, he was gone.? I want to predetermine where to set my uplink for a
given downlink.? There just is no the time be looking around.? Like I said
this is probably simple I'm just have trouble getting my thinking around the
concept.? Also if say I am planning on a downlink of 145.950 will Paul be
looking at the same frequency?? In the past these concepts never concerned
me as there was always plenty of time to yak it up with the locals on AO-7.
73 Bob W7LRD
CN87 Seattle, Wa.
----- Original Message -----
From: "Andrew Glasbrenner" <glasbrenner@xxxxxxxxxx.xxx>
To: "Greg D." <ko6th_greg@xxxxxxx.xxx>
Cc: w7lrd@xxxxxxx.xxxx amsat-bb@xxxxx.xxx
Sent: Thursday, January 7, 2010 9:30:44 PM GMT -08:00 US/Canada Pacific
Subject: Re: [amsat-bb] Re: probably simple
>
>
> But any pass where you are really stretching the footprint is going to
> be a low elevation pass. ?The more you stretch, the lower the pass. ?
> In the limit, I think Bob's ultimate pass has a peak at .001-degrees
> for both stations. ?If you're doing that, then you're at TCA, and zero
> doppler.
>
> That's all I meant to convey,
>
> Greg ?KO6TH
I understand, but with all due respect your assumption is incorrect that
long distance QSOs are always at TCA and zero Doppler, even
theoretically . This is only the case when the two stations are at near
right angles to the track of the satellite.
Use the following example. If I want to work LU5BOJ/O in FG75 from EL88
on HO-68, my only windows are at either LOS or AOS, depending on whether
it is an ascending or descending pass. Neither pass will be a low pass
for either station, and neither QSO will occur at TCA or zero Doppler.
In Bob's case, let's look at his next possible window with Paul, 2E1EUB
in IO92. Bob is in CN76. At the beginning of the 1 minute window
tomorrow at 1251Z, Bob's Doppler shift on 432 is -3.68 khz.
On the next mutual window at 1452Z, the beginning Doppler is -7.93 khz.
On the next, at 2020Z, it's -8.3 khz. None of these windows are over 2
degrees elevation, and none are at TCA for either station.
When you have 60s to make the QSO, being right dead on frequency is
essential.
Respectfully,
Drew KO4MA
------------------------------
Message: 14
Date: Thu, 7 Jan 2010 22:16:02 -0800
From: "Greg D." <ko6th_greg@xxxxxxx.xxx>
Subject: [amsat-bb] Re: probably simple
To: <w7lrd@xxxxxxx.xxx>, <glasbrenner@xxxxxxxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Message-ID: <BLU133-W8F9EB0BCEE3DC14BE4AF6A9700@xxx.xxx>
Content-Type: text/plain; charset="iso-8859-1"
Hi all,
Here's my (updated!) answer:
I think you're going to need to
depend on a computer prediction program. I use Predict on Linux, but
there is also a PC version. Predict, at least, can tell you what the
doppler-adjusted up and downlink would be for a specific satellite-perceived
frequency pair. I have mine set
up for mid-bandpass up and down on the linear birds, i.e. what the zero
doppler values are for the satellite itself. The program then tells me
what I should tune the radios to, so that the satellite hears my
signal at mid-bandpass, and I hear the return at the correct pitch.
Then, if your sked is at some other frequency you'll need to add or
subtract to compensate. For example, if the sked is set up for 10 khz
above mid-passband, I think you can just add 10 khz from your
computer-predicted uplink, and subtract 10 khz from the predicted
downlink (for an inverting passband), and be really close. If the sked
is 10 khz below mid-band, subtract 10 from the up, and add 10 to the
down. Both you and the other station will need to do the same thing,
both focusing on the satellite's perception of your signals. Your
individual numbers could be very different.
I hope I've got it right this time,
Greg KO6TH
Date: Fri, 8 Jan 2010 05:58:39 +0000
From: w7lrd@xxxxxxx.xxx
To: glasbrenner@xxxxxxxxxx.xxx
CC: amsat-bb@xxxxx.xxxx ko6th_greg@xxxxxxx.xxx
Subject: Re: [amsat-bb] Re: probably simple
Hi Greg, Drew, etc
This conversation is starting to make my head hurt! My example is to
connect with some of our European friends. Some of them I share maybe a 60
second window, with PA1TNO it is less than 30 seconds. I have had several
false starts in that I heard Paul 2E1EUB, by the time I located my downlink
on his, he was gone. I want to predetermine where to set my uplink for a
given downlink. There just is no the time be looking around. Like I said
this is probably simple I'm just have trouble getting my thinking around the
concept. Also if say I am planning on a downlink of 145.950 will Paul be
looking at the same frequency? In the past these concepts never concerned
me as there was always plenty of time to yak it up with the locals on AO-7.
73 Bob W7LRD
CN87 Seattle, Wa.
----- Original Message -----
From: "Andrew Glasbrenner" <glasbrenner@xxxxxxxxxx.xxx>
To: "Greg D." <ko6th_greg@xxxxxxx.xxx>
Cc: w7lrd@xxxxxxx.xxxx amsat-bb@xxxxx.xxx
Sent: Thursday, January 7, 2010 9:30:44 PM GMT -08:00 US/Canada Pacific
Subject: Re: [amsat-bb] Re: probably simple
>
>
> But any pass where you are really stretching the footprint is going to
> be a low elevation pass. The more you stretch, the lower the pass.
> In the limit, I think Bob's ultimate pass has a peak at .001-degrees
> for both stations. If you're doing that, then you're at TCA, and zero
> doppler.
>
> That's all I meant to convey,
>
> Greg KO6TH
I understand, but with all due respect your assumption is incorrect that
long distance QSOs are always at TCA and zero Doppler, even
theoretically . This is only the case when the two stations are at near
right angles to the track of the satellite.
Use the following example. If I want to work LU5BOJ/O in FG75 from EL88
on HO-68, my only windows are at either LOS or AOS, depending on whether
it is an ascending or descending pass. Neither pass will be a low pass
for either station, and neither QSO will occur at TCA or zero Doppler.
In Bob's case, let's look at his next possible window with Paul, 2E1EUB
in IO92. Bob is in CN76. At the beginning of the 1 minute window
tomorrow at 1251Z, Bob's Doppler shift on 432 is -3.68 khz.
On the next mutual window at 1452Z, the beginning Doppler is -7.93 khz.
On the next, at 2020Z, it's -8.3 khz. None of these windows are over 2
degrees elevation, and none are at TCA for either station.
When you have 60s to make the QSO, being right dead on frequency is
essential.
Respectfully,
Drew KO4MA
_________________________________________________________________
Hotmail: Free, trusted and rich email service.
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------------------------------
Message: 15
Date: Thu, 7 Jan 2010 13:24:22 -0800 (PST)
From: Louis House <kd5gm@xxxxxxxxx.xxx>
Subject: [amsat-bb] IC 910H query
To: amsat-bb@xxxxx.xxx
Message-ID: <815296.3496.qm@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=iso-8859-1
I plan to commission my new IC 910 H on Saturday this week.? I plan to drive
the radio with the "RigTalk" and CIV cable from a USB port. Has anyone
experienced any negative function from this data control system type??? In
setting up the SatPC32 software, the addresses that appeared by default are
"$60" (in all four?boxes in?the "Radio Set Screen").? Does this $60 setting
work OK??? The read me file is not very clear concerning the selection for
"RTS + 12V", does the?IC 910 H need this setting?selected to work
correctly????? Any other known problems would also be most helpful.?
Thanks for listening.
Louis, KD5GM
CW ;-) The Original Digital
------------------------------
Message: 16
Date: Fri, 08 Jan 2010 00:42:56 -0700
From: Larry Gerhardstein <gerhardstein@xxxxxxx.xxx>
Subject: [amsat-bb] Re: probably simple
To: Bob- W7LRD <w7lrd@xxxxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Message-ID: <4B46E200.8090109@xxxxxxx.xxx>
Content-Type: text/plain; charset=UTF-8; format=flowed
Bob W7LRD,
I disagree that Doppler shift will be zero when your window to work
northern EU is optimum.
In SatPC32, I just did a Tracking->Preview and determined that when the
AO-07 footprint includes both the northwest USA and northern Europe, the
down link Doppler is +2.8 and up link Doppler is -8.3.
Note, the numbers +2.8 and -8.3 were for orbit #60844. I also
determined that if a different orbit, then you get different Doppler
shifts. Determine the pass that you wish to attempt a contact and use
the Doppler numbers you get from Tracking->Preview for that pass.
Next pick a frequency using VFO mode in SatPC32 and do some
experimenting. You may need to waste a window of opportunity, but using
a ratio of -8.3/2.8 uplink to downlink Doppler, you should be able to do
a respectable calculation.
Another problem: The Doppler for the station in northern-EU will likely
be different than yours. This means you might wish to coordinate with
the station over there as you attempt contact. When I tried to enter
grid JPnn into SatPC32, it would not accept it. It calculated NAN (not
a number) for latitude. Don't know what that's about.
However if you're using CW & not SSB, this may make little difference.
As long as you're getting a CW signal in the band pass of your RX, you
should be able to copy.
And remember, the squeaky wheel gets the oil. Keep making noise about
this on this BB until something works.
I know you wanted a simpler answer. Hope this does not seem too
complicated. The Trig/Math to work this out is possible, but tricky.
Good luck.
73, Larry W7IN (home=DN27 Plains, Montana)
------------------------------
Message: 17
Date: Fri, 8 Jan 2010 18:17:57 +1000
From: "Andrew Rich" <vk4tec@xxxxxxxxxxxxx.xxx>
Subject: [amsat-bb] Re: HO-68 BBS upload!!
To: "Dave Aitch" <dave@xxxxx.xxx>, <amsat-bb@xxxxx.xxx>
Message-ID: <1CE49ED2A2F24933A58E43F2A9CCED22@xxxxxxxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Can these satellite protocols be used on earth ?
Station to station ?
Andrew VK4TEC
----- Original Message -----
From: "Dave Aitch" <dave@xxxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Sent: Friday, January 08, 2010 3:29 AM
Subject: [amsat-bb] HO-68 BBS upload!!
>I also uploaded a file with WiSP. Hope you can download it OK.
>
> It would be nice if other voice users did not transmit until the
> packet transmission has stopped though.
>
> Patience gentlemen, please.
>
> 73, Dave. G1OCN.
> AMSAT 5766
>
>
> Subject: [amsat-bb] HO-68 BBS upload!!
>
> I succeeded in upload a file into BBS using WiSP, the file number was
> 'CB'.
>
> http://www.ne.jp/asahi/hamradio/je9pel/xw1_digi.htm#bottom
>
> JE9PEL, Mineo Wakita
>
> _______________________________________________
> 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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