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CX2SA > SATDIG 02.03.17 06:20l 543 Lines 18364 Bytes #999 (0) @ WW
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To : SATDIG@WW
Today's Topics:
1. ISS Boosting It's Orbit (JoAnne K9JKM)
2. VUCC Awards for February 2017 (John Papay)
3. Re: BY70-1 (Phil Karn)
4. Re: Solid State conversion (tube equivalents)? END
(Robert Bruninga)
5. Re: BY70-1 (Phil Karn)
6. AO-73 is ROCKING (Mark Lunday)
7. EL39 3/2 (R.T.Liddy)
8. Re: Still trying to decode NO-84 (Mark Lunday)
9. Re: Still trying to decode NO-84 (Paul Stoetzer)
10. Re: TS-2000 Strange behavior (Mike Thompson)
11. Re: BY70-1 (Howie DeFelice)
----------------------------------------------------------------------
Message: 1
Date: Wed, 1 Mar 2017 15:25:19 -0600
From: JoAnne K9JKM <joanne.k9jkm@xxxxx.xxx>
To: AmsatBB <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] ISS Boosting It's Orbit
Message-ID:
<CANOtx_fcvCkKkyWGhAJibF8FC7oMW1s=bQVBTgj4PFD9N8hc6Q@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
Update your ISS keps:
The International Space Station will boost its orbit Wednesday night to get
ready for a crew swap next month. Three Expedition 50 crew members will
complete their mission and a new two-person crew will launch to the station
in April.
https://blogs.nasa.gov/spacestation/2017/03/01/station-boosting-orbit-for-apri
l-crew-swap/
Watch the line wrap ... the -bb kills long URLs.
--
73 de JoAnne K9JKM
k9jkm@xxxxx.xxx
------------------------------
Message: 2
Date: Wed, 01 Mar 2017 16:24:57 -0500
From: John Papay <john@xxxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] VUCC Awards for February 2017
Message-ID: <20170301215532.5C53E95CE@xxxxxxxxxx.xxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"; format=flowed
Congratulations to the following satellite operators
who were awarded endorsements for Satellite VUCC by the
ARRL during the period 1Feb2017 thru 1Mar2017:
WA4NVM-1413
KD8CAO-1200
W5PFG-982
N8RO-918
N7SFI-829
K4FEG-711
N8HM-608
N4UFO-601
KG5CCI-452
N9IP-417
K5ND-200
W7QL-180
W4DTA-151
AI6GS-136
N6RFM-107
There were 2 new VUCC awards:
WI7P - 829
AK4WQ (EN34) - 106
The ARRL VUCC Award is the most prestigious and sought after
award for satellite operators. The award is
what inspires all of the roving activity here in the United
States and around the world. A special thanks to all rovers
who make the effort to operate away from home. The Central
States VHF Society sponsors the reverse VUCC award for rovers
who operate in 100 or more grids away from home. Some of our
current rovers are already eligible or close to being eligible
for this award. Recipients so far include N7SFI, N5AFV, ND9M and
KD4ZGW. (as of 5July2016 www.csvhfs.org)
73,
John K8YSE
---
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------------------------------
Message: 3
Date: Wed, 1 Mar 2017 14:21:03 -0800
From: Phil Karn <karn@xxxx.xxx>
To: Howie DeFelice <howied231@xxxxxxx.xxx>, "amsat-bb@xxxxx.xxxx
<amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] BY70-1
Message-ID: <be59359f-cb8a-1558-2790-18742f011c99@xxxx.xxx>
Content-Type: text/plain; charset=windows-1252
On 2/27/17 10:37, Howie DeFelice wrote:
> Thanks Phil, that explanation cleared up many questions. I had been
> thinking about ways to use the earths magnetic field to raise perigee by
> storing energy in capacitors and pulsing something along the lines of a
> magnetorquer with a high current pulse at the right time and vector. The
> problem, I think, is that I would need to generate the thrust at apogee
> where the earths magnetic field is weakest.
If you're going to use the earth's magnetic field to change orbit, you
want a linear force, not a torque as you'd use for attitude control.
A straight conductor will experience a Lorentz force perpendicular to
both the current flow and the ambient magnetic field. Problem is, how do
you close the circuit to keep the current flowing? If you run a second
conductor through the same magnetic field, it will experience an equal
and opposite Lorentz force. If it's physically separated from the first
conductor (i.e. forming a loop), the result will be a net torque, not a
net linear force.
So you need one of two things. Option #1 is a gradient in the magnetic
field. If your "forward" conductor is in a stronger part of the field,
it will experience a greater Lorentz force for a given current than the
"return" conductor in a weaker part of the field. You'll then get a net
linear force, along with plenty of torque.
The other possibility is to use something not attached to your
spacecraft as the return conductor so you won't feel the opposing
Lorentz force. But what conductor is there in space??
LEO is actually within the ionosphere, and that's your return path. This
is in fact how tethers have been used so far to either add or remove
energy from a satellite orbit.
Some years ago N6NKF and I looked at how much linear force you could get
from a practical magnetorquer coil. (I think it was when Oscar 13 was
decaying, so that was 20 years ago!) I don't remember the exact result
but I do remember it being negligible.
Here's a wild idea I just had. I wonder if it would be practical to
build an ion thruster for use in the ionosphere that uses the ambient
ions as your reaction mass? Think of it as vaguely analogous to the
Bussard Ramjet in science fiction. You'd collect both protons and
electrons and accelerate the protons rearward and the electrons forward
to maintain charge balance. The protons, being much more massive, would
result in a net forward thrust. You could also see this as analogous to
an airplane, only the "propellers" are electric fields that work on an
ambient atmosphere that is ionized.
Phil
------------------------------
Message: 4
Date: Wed, 1 Mar 2017 18:26:21 -0500
From: Robert Bruninga <bruninga@xxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] Solid State conversion (tube equivalents)? END
Message-ID: <b107d16ba2c72c7c06f5530354dac0b4@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
Here is the conclusion to this thread with great feedback from James
Duffey and Diane Bruce...
> I picked up an old boatanchor LM-21 Frequency Meter at a Hamfest over
the weekend. I original asked people here about converting the 3 tubes to
solid state. But they said, why bother. Just use it with the tubes...
and were curious how well it was calibrated now compared to its 85 year
old design age (1930's)?
So today I just powered it up with the tubes and it was within 150 Hz at 2
MHz after not being used since 1976. Not bad. In fact when I first
compared it to the modern sig gen, I thought it wasn't even working
because the 150 Hz was so close to zero beat I didn't hear it at first
until I dithered the dial!
I have no idea why I am doing this, but it sure brings back the good ole
days...
Bob, WB4APR
-----Original Message-----
From: James Duffey [mailto:jamesduffey@xxxxxxx.xxxx
... why bother converting to solid state? The LM/BC-221 frequency meters
are, as you note, very nice frequency meters/sources. They don't drift
when warmed up and are very solid mechanically. They age well and you are
likely to have performance now very close to what they were new.
If you insist on converting it to solid state, here is one article
describing how:
< http://www.hanssummers.com/images/stories/bc221t/bc221.pdf >
< http://hanssummers.com/bc221t.html >
including schematics and the manual.
But I doubt performance will be substantially better, if any, than the
tube unit you start out with.
Enjoy it. Technologically it is a wonderful thing to have just the way it
is. It is still a very useful laboratory quality instrument. - Duffey
KK6MC
------------------------------
Message: 5
Date: Wed, 1 Mar 2017 15:27:11 -0800
From: Phil Karn <karn@xxxx.xxx>
To: Howie DeFelice <howied231@xxxxxxx.xxx>, "amsat-bb@xxxxx.xxxx
<amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] BY70-1
Message-ID: <7ed1e14e-fc9c-585f-be82-9ea7446f1580@xxxx.xxx>
Content-Type: text/plain; charset=utf-8
On 3/1/17 14:57, Howie DeFelice wrote:
> "You'd collect both protons and
> electrons and accelerate the protons rearward and the electrons forward
> to maintain charge balance. The protons, being much more massive, would
> result in a net forward thrust"
>
>
> sort of like the atomic equivalent of electrolysis ? So unlike current
> ion thrusters, you wouldn't need to carry a medium to ionize.
Right.
The Holy Grail of space travel seems to be propulsion with energy but no
propellant mass, at least propellant mass you have to carry with you.
You can make as much energy as you want from solar panels if you're
patient. Or use a nuclear reactor if you're less than patient, but
ultimately energy in space is nearly unlimited.
Mass is the big problem, because by definition space contains very
little of it (if any). So if there *is* any mass around you, however,
small, you should try to figure out a way to use it.
I also think about all the mass that's sent to the ISS only to be
wasted: upper stages of launch vehicles, complete cargo vessels, etc.
This waste won't get us to the planets. Everything sent into space
should be (re)used as many times as possible. Cargo ships and even spent
rocket stages should become permanent additions to the station, for
storage if nothing else.
Even trash could be used as reaction mass to reboost the station's orbit
if you can figure out how to accelerate it. A big electromagnetic
slingshot running the length of the station, for example.
Phil
------------------------------
Message: 6
Date: Thu, 2 Mar 2017 02:09:58 +0000
From: Mark Lunday <wd4elg@xxxxxxx.xxx>
To: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] AO-73 is ROCKING
Message-ID:
<CO2PR06MB4917C5C933DED7D30D79DFF95280@xxxxxxxxxxxx.xxxxxxxx.xxxx.xxxxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"
Wow, 0200 UTC pass over east central US. I heard my downlink CW CQ
throughout the pass, very strong! Too bad no one else was on that I could
hear. Right on alignment: center of passband up = center of passband down.
Fabulous.
Mark Lunday, WD4ELG
Greensboro, NC FM06be
wd4elg@xxxx.xxx
http://wd4elg.blogspot.com
SKCC #16439 FISTS #17972
------------------------------
Message: 7
Date: Thu, 2 Mar 2017 02:37:29 +0000 (UTC)
From: "R.T.Liddy" <k8bl@xxxxxxxxx.xxx>
To: AMSAT BB <amsat-bb@xxxxx.xxx>, Starcom <starcom-bb@xxxxxxxx.xxx>
Subject: [amsat-bb] EL39 3/2
Message-ID: <40689839.95342.1488422249338@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
I've had several requests for EL39 before I skiptown. So, it'll be tomorrow
on FO29 1600Z pass.Look 10-15 KHz above center.CUL, ? Bob ?K8BL
------------------------------
Message: 8
Date: Thu, 2 Mar 2017 02:35:48 +0000
From: Mark Lunday <wd4elg@xxxxxxx.xxx>
To: Greg D <ko6th.greg@xxxxx.xxx>, "amsat-bb@xxxxx.xxxx
<amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] Still trying to decode NO-84
Message-ID:
<CO2PR06MB4916F7E5D28A7C931D897FC95280@xxxxxxxxxxxx.xxxxxxxx.xxxx.xxxxxxx.xxx>
Content-Type: text/plain; charset="utf-8"
0230 UTC pass, saw the bear claw PSK 31 waveform again. Anyone else able to
see the PSK dowllink? I am seeing 7 parallel traces, almost like the
transmission is overloading the receiver.
Attempting to attach the file to this email with a capture of what my SDR
receiver is seeing...
On a positive note, APRS is working perfectly on NO84 even at low passes.
Mark Lunday, WD4ELG
Greensboro, NC FM06be
wd4elg@xxxx.xxx
http://wd4elg.blogspot.com
SKCC #16439 FISTS #17972
------------------------------
Message: 9
Date: Wed, 1 Mar 2017 21:57:14 -0500
From: Paul Stoetzer <n8hm@xxxx.xxx>
To: Mark Lunday <wd4elg@xxxxxxx.xxx>
Cc: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] Still trying to decode NO-84
Message-ID:
<CABzOSOpKywE8Ee9GhEed55iFhJYs4rmamebP7ikjnuv=qn5xzg@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
Mark,
Is your receiver set to FM mode for the downlink?
73,
Paul, N8HM
On Wed, Mar 1, 2017 at 9:35 PM, Mark Lunday <wd4elg@xxxxxxx.xxx> wrote:
> 0230 UTC pass, saw the bear claw PSK 31 waveform again. Anyone else able
to see the PSK dowllink? I am seeing 7 parallel traces, almost like the
transmission is overloading the receiver.
>
> Attempting to attach the file to this email with a capture of what my SDR
receiver is seeing...
>
> On a positive note, APRS is working perfectly on NO84 even at low passes.
>
> Mark Lunday, WD4ELG
> Greensboro, NC FM06be
> wd4elg@xxxx.xxx
> http://wd4elg.blogspot.com
> SKCC #16439 FISTS #17972
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions
expressed
> are solely those of the author, and do not reflect the official views of
AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 10
Date: Wed, 1 Mar 2017 21:21:04 -0600
From: Mike Thompson <zryder94@xxxxx.xxx>
To: Paul Stoetzer <n8hm@xxxx.xxx>
Cc: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] TS-2000 Strange behavior
Message-ID:
<CAGD5MUHPyyr26d1Bs8Ne0jWwAOSvuek4eXcMgxbPfWOvepOnug@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
Full microprocessor reset via the previous mentioned procedure did not fix
the problem.
On Wed, Mar 1, 2017 at 7:26 AM, Paul Stoetzer <n8hm@xxxx.xxx> wrote:
> Did you do a full microprocessor reset by pressing [A=B]+[Power]?
>
> 73,
>
> Paul, N8HM
>
> On Wed, Mar 1, 2017 at 8:20 AM, Mike Thompson <zryder94@xxxxx.xxx> wrote:
> > Thank you for the help.
> > I shot another short video showing some more symptoms of my problem
> >
> > https://youtu.be/_jSYL8UdeLc
> >
> > Thank's for the help.
> > Mike, AE0MT
> >
> > On Tue, Feb 28, 2017 at 11:06 PM, Jerry Buxton <n0jy@xxxxx.xxx> wrote:
> >
> >> AO-85 and Fox-1B/Cliff/D will start the transmitter "hang timer" when
> >> they detect the CTCSS. The tone must be again detected within 60
> >> seconds in order to reset the hang timer else the downlink transmission
> >> will stop. By having your tone on your uplink signal all the time, each
> >> time someone keys it resets the hang timer.
> >>
> >> Jerry Buxton, N?JY
> >>
> >> On 2/28/2017 18:45, Andrew Glasbrenner wrote:
> >> > Actually the PL tone on AO-85 just turns the repeater on. Once it's
> on,
> >> there's no tone required until it times out...that's why you hear the
> noise
> >> on the uplink.
> >>
> >> _______________________________________________
> >> Sent via AMSAT-BB@xxxxx.xxx. AMSAT-NA makes this open forum available
> >> to all interested persons worldwide without requiring membership.
> Opinions
> >> expressed
> >> are solely those of the author, and do not reflect the official views of
> >> AMSAT-NA.
> >> Not an AMSAT-NA member? Join now to support the amateur satellite
> program!
> >> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
> >>
> > _______________________________________________
> > Sent via AMSAT-BB@xxxxx.xxx. AMSAT-NA makes this open forum available
> > to all interested persons worldwide without requiring membership.
> Opinions expressed
> > are solely those of the author, and do not reflect the official views of
> AMSAT-NA.
> > Not an AMSAT-NA member? Join now to support the amateur satellite
> program!
> > Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
>
------------------------------
Message: 11
Date: Thu, 2 Mar 2017 04:12:41 +0000
From: Howie DeFelice <howied231@xxxxxxx.xxx>
To: Phil Karn <karn@xxxx.xxx>, "amsat-bb@xxxxx.xxxx
<amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] BY70-1
Message-ID:
<BN6PR17MB09779C495110C948FA4D1926E7280@xxxxxxxxxxxxx.xxxxxxxx.xxxx.xxxxxxx.xx
x>
Content-Type: text/plain; charset="utf-8"
We could have probably built a maglev space elevator in less time and for
less money than Constellation/Orion spacecraft. The recurring cost savings
of not launching "dead weight" would have paid for the whole thing over time.
- Howie AB2S
________________________________
From: Phil Karn <karn@xxxx.xxx>
Sent: Wednesday, March 1, 2017 6:27 PM
To: Howie DeFelice; amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] BY70-1
On 3/1/17 14:57, Howie DeFelice wrote:
> "You'd collect both protons and
> electrons and accelerate the protons rearward and the electrons forward
> to maintain charge balance. The protons, being much more massive, would
> result in a net forward thrust"
>
>
> sort of like the atomic equivalent of electrolysis ? So unlike current
> ion thrusters, you wouldn't need to carry a medium to ionize.
Right.
The Holy Grail of space travel seems to be propulsion with energy but no
propellant mass, at least propellant mass you have to carry with you.
You can make as much energy as you want from solar panels if you're
patient. Or use a nuclear reactor if you're less than patient, but
ultimately energy in space is nearly unlimited.
Mass is the big problem, because by definition space contains very
little of it (if any). So if there *is* any mass around you, however,
small, you should try to figure out a way to use it.
I also think about all the mass that's sent to the ISS only to be
wasted: upper stages of launch vehicles, complete cargo vessels, etc.
This waste won't get us to the planets. Everything sent into space
should be (re)used as many times as possible. Cargo ships and even spent
rocket stages should become permanent additions to the station, for
storage if nothing else.
Even trash could be used as reaction mass to reboost the station's orbit
if you can figure out how to accelerate it. A big electromagnetic
slingshot running the length of the station, for example.
Phil
------------------------------
Subject: Digest Footer
_______________________________________________
Sent via amsat-bb@xxxxx.xxx.
AMSAT-NA makes this open forum available to all interested persons worldwide
without requiring membership. Opinions expressed
are solely those of the author, and do not reflect the official views of
AMSAT-NA.
Not an AMSAT member? Join now to support the amateur satellite program!
http://www.amsat.org/mailman/listinfo/amsat-bb
------------------------------
End of AMSAT-BB Digest, Vol 12, Issue 58
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