| |
CX2SA > SATDIG 30.07.14 06:17l 689 Lines 24084 Bytes #999 (0) @ WW
BID : AMSATBB9261
Read: GUEST
Subj: AMSAT-BB-digest V9 261
Path: IW8PGT<IZ3LSV<IQ5KG<IK1NHL<CX2SA
Sent: 140730/0406Z @:CX2SA.SAL.URY.SOAM #:8742 [Salto] FBB7.00e $:AMSATBB9261
From: CX2SA@CX2SA.SAL.URY.SOAM
To : SATDIG@WW
Today's Topics:
1. Loss of Cubesat Designer? (Robert Bruninga)
2. Re: Loss of Cubesat Designer? (M5AKA)
3. Re: Loss of Cubesat Designer? (Larry Koziel)
4. ARRL Convention - follow-up (Patrick STODDARD (WD9EWK/VA7EWK))
5. SAT PC 32 question (Jim Heck)
6. XE3DX trip through central Mexico, this week on SO-50
(Patrick STODDARD (WD9EWK/VA7EWK))
7. Re: SatPC32 question (Alan)
8. activation of Grids (David Maciel (XE3DX))
9. New Low-cost Launcher For Satellites (B J)
10. Eggbeater Tuning (Richard Lawn)
11. Re: Eggbeater Tuning (Dino Papas)
12. Re: New Low-cost Launcher For Satellites (M5AKA)
13. Re: New Low-cost Launcher For Satellites (B J)
14. WB5H?? on AO-73 (Paul Stoetzer)
15. Re: FM birds (Phil Karn)
----------------------------------------------------------------------
Message: 1
Date: Tue, 29 Jul 2014 09:53:27 -0400
From: Robert Bruninga <bruninga@xxxx.xxx>
To: amsat bb <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Loss of Cubesat Designer?
Message-ID:
<CALdCfN+NCUZyDz8piY8R-yv9ZaW9nOE-Mj8MQzqsmrmyy3FkMw@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
I heard part of something on the news about one of the victims of the
Aircraft shootdown in the Ukraine was a young Aerospace engineer working on
a design for a constellation of cubesats for low cost communication with
individuals on the ground.
Sounds like a HAMsat project to me. Anyone know the story?
Bob, WB4APR
------------------------------
Message: 2
Date: Tue, 29 Jul 2014 15:52:34 +0100
From: M5AKA <m5aka@xxxxx.xx.xx>
To: Robert Bruninga <bruninga@xxxx.xxx>, amsat bb <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] Loss of Cubesat Designer?
Message-ID:
<1406645554.8181.YahooMailNeo@xxxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=utf-8
Bob,
I presume you are referring to Fatima Dyczynski the 24-year-old aerospace
engineer, a promising young
innovator, who founded her own technology start-up with a vision of making
space accessible to anyone.
She did her degree in aerospace, aeronautical and astronautical engineering
at Delft University of Technology in the Netherlands.
She reportedly worked on the amateur radio satellite Delfi-n3Xt.
http://www.smh.com.au/world/vibrant-life-of-young-space-engineer-cut-short-on-
mh17-flight-20140720-zv0wy.html#ixzz38ruDhWrn
I don't know if she was licensed.
I also saw the stories about the Ukrainian Air Force Pilot ceased by
insurgents and currently held in Russia ????? ????????. Her name
was converted to English by various news sources as either Nadia, Nadezhda,
Nadiya or Natalia Savchenko. She used to be a Military Radio Operator and
her sister said of her "She can repair little problems with electrical
devices". Again may possibly be an amateur.
73 Trevor M5AKA
On Tuesday, 29 July 2014, 14:53, Robert Bruninga <bruninga@xxxx.xxx> wrote:
I heard part of something on the news about one of the victims of the
Aircraft shootdown in the Ukraine was a young Aerospace engineer working on
a design for a constellation of cubesats for low cost communication with
individuals on the ground.
Sounds like a HAMsat project to me.? Anyone know the story?
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: 3
Date: Tue, 29 Jul 2014 10:22:48 -0400
From: Larry Koziel <aptura.larry@xxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] Loss of Cubesat Designer?
Message-ID:
<CAGx61w=aPu=gD07XZ2PLgmpDeyDRUnAD8KRCtCwKfNoidwzbKA@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
Bob,
Unfortunately, it looks like it's true.
http://lmgtfy.com/?q=mh17+aerospace+engineer
She had been a member of the DELFIN3Xt team while at Delft University of
Technology and then was CEO, founder and project manager of Xoterra Space.
See also: http://www.xoterraspace.com/the-team/
<http://www.xoterraspace.com/the-team/>.
Larry K8MU
------------------------------
Message: 4
Date: Tue, 29 Jul 2014 09:04:42 -0700
From: "Patrick STODDARD \(WD9EWK/VA7EWK\)" <amsat-bb@xxxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] ARRL Convention - follow-up
Message-ID:
<1406649882.34086.YahooMailBasic@xxxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
Hi!
Even though we were not permitted to record our presentations during
the ARRL Centennial Convention just over a week ago, I was able to
record the satellite demonstrations done outside the convention center
over those three days. I had attempted to work SO-50 on Friday (18
July) and Saturday (19 July) afternoon from outside the convention,
but could not get through during those passes. AO-7, on the other
hand, saw more success.
This video is a combination of the audio from the AO-7 downlink with
photos from the demonstration and AMSAT's presence at the ARRL
convention. This pass was on Thursday, 17 July, at 2026 UTC - as
our day-long training seminar wrapped up:
https://www.youtube.com/watch?v=G5TjXbuLv5s
On Saturday (19 July) morning, I was able to have a short contact
with astronaut (and US Navy Commander) Reid Wiseman. Again, I
did not have a video, but took the audio from the contact and added
a photo slideshow:
https://www.youtube.com/watch?v=yoFbhPXsUx0
The ISS was passing to the southwest of Hartford, in the direction
where I had the easiest time hearing it. An earlier pass that went
across the northern sky was harder, dealing with the tall buildings
in that direction.
The last video is an actual video of an AO-7 demonstration later in the
day on Saturday. The convention had officially closed about 20 minutes
before the start of this video, and there was a nice crowd that stopped
by to take in the demonstration:
https://www.youtube.com/watch?v=BHd91H_t88o
This video shows an example of AO-7's recent behavior, where it will
switch from mode B to mode A during a pass. Unfortunately, this switch
took place around the time AO-7 was directly over Hartford.
All 3 demonstrations, along with the unsuccessful SO-50 demonstrations,
took place on the plaza in front of the Connecticut Convention Center, in
grid FN31ps. From this location, there was good visibility to the south and
west, and not so much toward the east (looking at the convention center
and its parking garage). The two AO-7 passes had very high elevation
as the satellite passed from south to north, and the ISS pass was a high
pass across the southwestern sky.
If you want to see what was being presented during the day-long training
seminar, and talked about during the rest of the convention, please visit:
http://www.amsat.org/?page_id=2914
The slideshows from those presentations are available in PowerPoint and
PDF formats.
73!
Patrick WD9EWK/VA7EWK
http://www.wd9ewk.net/
------------------------------
Message: 5
Date: Tue, 29 Jul 2014 17:54:29 +0100
From: "Jim Heck" <jimlist@xxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] SAT PC 32 question
Message-ID: <00ac01cfab4d$c510ae70$4f320b50$@xxx>
Content-Type: text/plain; charset="us-ascii"
Hi Folks,
I wish to track two satellites (actually FUNcube and UKube) at the same
time. The TLM for one is in cubesats.txt and the other is in tle-new.txt.
Is there a way of displaying them both in the main window at the same
time? When I select one, the other is automatically removed from the list.
I have tired copying the tles for one into the other's file, and this
works OK, but it rather tedious!
The problem might be resolved when the elements for Ukube are included in
the cubesats.txt file, but they will appear as A and B on the main display
(bottom right hand corner), whereas I would like to display them both on the
map simultaneously. Is there a way of doing this?
Thanks for any help
73s Jim G3WM
------------------------------
Message: 6
Date: Tue, 29 Jul 2014 10:15:21 -0700
From: "Patrick STODDARD \(WD9EWK/VA7EWK\)" <amsat-bb@xxxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] XE3DX trip through central Mexico, this week on
SO-50
Message-ID:
<1406654121.90937.YahooMailBasic@xxxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
Hi!
Omar XE1AO sent me a brief message, saying that David XE3DX
will be on a family trip through central Mexico, and plans to work
SO-50 passes from several grids during the trip this week. The
tentative list of grids David plans to visit are:
EL00 DL90 DL80 DL91 DL92 DL81 DL82 DL83 DK99 DK89
Omar did not have a schedule showing when David would be on
from those grids. As this is a family trip, David may not be able to
work all possible SO-50 passes during this time. Omar just worked
David earlier this morning from grid EK27, so he hasn't reached
the area of those grids listed above yet.
Good luck, and 73!
Patrick WD9EWK/VA7EWK
http://www.wd9ewk.net/
------------------------------
Message: 7
Date: Tue, 29 Jul 2014 13:20:40 -0500
From: Alan <wa4sca@xxxxx.xxx>
To: <jimlist@xxxx.xxx>, <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] SatPC32 question
Message-ID: <000201cfab59$ce396260$6aac2720$@xxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"
Hi Jim,
You are correct that you need to get the Keps in the same group to display
them at the same time.
They will eventually migrate, and you can request that from Tim Kelso on his
web site to speed the
process up.
As for seeing them simultaneously, use Multitrack. First go to Satellites.
On the Selected list,
use the Show On/Off button to select the ones you want to see
simultaneously. There will be an
asterisk in front of the name. Exit back to the main page, and click the
"M" in the upper left option
panel. That will turn on Multitrack.
73s,
Alan
WA4SCA
<-----Original Message-----
<From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of Jim Heck
<Sent: Tuesday, July 29, 2014 11:54 AM
<To: amsat-bb@xxxxx.xxx
<Subject: [amsat-bb] SAT PC 32 question
<
<Hi Folks,
<
< I wish to track two satellites (actually FUNcube and UKube) at the same
<time. The TLM for one is in cubesats.txt and the other is in tle-new.txt.
<
< Is there a way of displaying them both in the main window at the same
<time? When I select one, the other is automatically removed from the list.
<
< I have tired copying the tles for one into the other's file, and this
<works OK, but it rather tedious!
<
< The problem might be resolved when the elements for Ukube are included in
<the cubesats.txt file, but they will appear as A and B on the main display
<(bottom right hand corner), whereas I would like to display them both on the
<map simultaneously. Is there a way of doing this?
<
<Thanks for any help
<73s Jim G3WM
<
<
<_______________________________________________
<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: 8
Date: Tue, 29 Jul 2014 13:10:31 -0500
From: "David Maciel \(XE3DX\)" <david.xe3dx@xxxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] activation of Grids
Message-ID: <002c01cfab58$63df3d00$2b9db700$@xxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"
Good day, all week I will work on SO-50 will work on DL90 DL80 DL91 EL00
DL92 DL81 DL82 DL83 DK99 DK89 grids,
I have exact days, I can only say it will be all week, greetings and hope to
hear ....
David Maciel
Enviado desde mi IPHONE
------------------------------
Message: 9
Date: Tue, 29 Jul 2014 21:26:14 +0000
From: B J <va6bmj@xxxxx.xxx>
To: amsat-bb <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] New Low-cost Launcher For Satellites
Message-ID:
<CAP7QzkN=ysmtyPVesfaHa7f=74Q+0CfCJN+mib6SXdGJcVpS4g@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
http://www.parabolicarc.com/2014/07/29/rocket-lab-announces-small-satellite-la
uncher/
http://www.stuff.co.nz/technology/gadgets/60372738/kiwi-rocket-company-ready-t
o-blast-off.html
http://www.sbs.com.au/news/article/2014/07/29/kiwi-launches-world-first-cheap-
rocket-0
73s
Bernhard VA6BMJ @ DO33FL
------------------------------
Message: 10
Date: Tue, 29 Jul 2014 17:54:06 -0400
From: Richard Lawn <rjlawn@xxxxx.xxx>
To: Amsat BB <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Eggbeater Tuning
Message-ID:
<CADQmrTFV-wzZ210=7LWzoe1o=5WsGD4O+ebXqLVJAXaXyOcjeQ@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
I was just attempting to work a station on AO-7 using my lake house setup -
FT-847, eggbeaters, and Ubuntu with Wine running SatPC32, I noticed power
was quite low on the 70cm output. I learned by tuning around the band and
running output checks that apparently the rig doesn't like the SWR at
around 432-433 mhz. I don't recall that there is any way to make tuning
adjustments on the eggbeaters, but please tell me if I'm wrong.
Rick
W2JAZ
------------------------------
Message: 11
Date: Tue, 29 Jul 2014 18:14:30 -0400
From: Dino Papas <kl0s@xxx.xxx>
To: AMSAT-BB <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] Eggbeater Tuning
Message-ID: <1CB5E1E8-7402-474C-A947-AB14CDDE453E@xxx.xxx>
Content-Type: text/plain; charset=windows-1252
Rick - this may be totally unrelated but just in case?
I had a very similar problem with my Icom IC-910H and the M2 430 MHz double
yagi I use here. I found that the power output at several of the MHz
increments between 430 and 440 MHz was down from the 75W it should have
been, usually down to ~50W. Straight into a dummy load I get full output
regardless of the operating frequency.
At first I thought it must be the antenna, coax, cross polarization switch,
preamp etc?never thought it was the rig?UNTIL I was talking to the Icom
service guy who had just repaired the 432MHz driver on the rig. I asked
about the issue and he told me that the 910H on 432 was (1) particularly
sensitive to SWR bumps and that (2) there wasn?t any way to fix it! He
actually didn?t like working on them (the 432 part) because even on the test
bench any impedance bump along the way would in some cases cause the SWR
power fold-back circuit to reduce the output. He went so far as to say that
he would only connect them directly to his service monitor without any other
gear in the line like a Bird wattmeter so that he could work on them and not
have that happen.
Again, don?t know if this applies, but now that you?ve mentioned it I?m
going to have to hook up my recently acquired (and not tested except on the
bench) FT-847 to see if I get similar results with my antenna system.
BTW, my M2 eggbeaters (both 2m and 432) both look absolutely flat and we
used it for our ARISS school contact as our backup antenna back in January.
If you?re using a M2 eggbeater check the SO-239 connection at the base; my
original base actually had the coax center conductor break off internally
after tightening the PL-259. M2 sent me a new base although I was able to
repair it myself just prior to our ARISS event and we actually ended up
making the QSO on the eggbeater after problems with the primary setup.
Anyway, just a thought.
73 - Dino KL0S
On Jul292014, at 1754 PM, Richard Lawn <rjlawn@xxxxx.xxx> wrote:
> I was just attempting to work a station on AO-7 using my lake house setup -
> FT-847, eggbeaters, and Ubuntu with Wine running SatPC32, I noticed power
> was quite low on the 70cm output. I learned by tuning around the band and
> running output checks that apparently the rig doesn't like the SWR at
> around 432-433 mhz. I don't recall that there is any way to make tuning
> adjustments on the eggbeaters, but please tell me if I'm wrong.
>
> Rick
> W2JAZ
------------------------------
Message: 12
Date: Tue, 29 Jul 2014 23:32:27 +0100
From: M5AKA <m5aka@xxxxx.xx.xx>
To: va6bmj@xxxxx.xxxx AMSAT BB <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] New Low-cost Launcher For Satellites
Message-ID:
<1406673147.16282.YahooMailMobile@xxxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=utf-8
It's another company that has yet to demonstrate it can actually achieve
successful satellite launches, there must be about half a dozen such
companies by now. But I guess there's a good chance some of them may
succeed in launching a satellite in the next 5 or so years. The more launch
capacity the better.
Getting launches at under $100,000 per kilo is hard which is why even
unproven companies can attract interest from sat groups desperate to launch.
They are charging $4.9 million for a 110kg payload into a very low 500 km
orbit. That's about $45,000 per kilo.
73 Trevor M5AKA
------------------------------
Message: 13
Date: Wed, 30 Jul 2014 00:51:13 +0000
From: B J <va6bmj@xxxxx.xxx>
To: M5AKA <m5aka@xxxxx.xx.xx>
Cc: AMSAT BB <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] New Low-cost Launcher For Satellites
Message-ID:
<CAP7QzkMGuhzt5qUivjJDhT5cMb4UTsWkmcWMattK9-BUyB_05A@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
On 7/29/14, M5AKA <m5aka@xxxxx.xx.xx> wrote:
> It's another company that has yet to demonstrate it can actually achieve
> successful satellite launches, there must be about half a dozen such
> companies by now. But I guess there's a good chance some of them may
> succeed in launching a satellite in the next 5 or so years. The more launch
> capacity the better.
>
> Getting launches at under $100,000 per kilo is hard which is why even
> unproven companies can attract interest from sat groups desperate to launch.
<snip>
I know of one such company. Its booster is several years behind
schedule and has yet to fly. Its launch facility has still under
construction, as far as I know. However, I also know of someone
looking to put a bird into orbit and it appears that this company will
put it there for them. From what I understand, the price offered to
that client was, relatively speaking, dirt cheap. I guess someone's
desperate for business.
Personally, if I was doing something like that, I'd rather pay a
higher cost but know that I'm dealing with a launch service that has a
proven track record.
73s
Bernhard VA6BMJ @ DO33FL
------------------------------
Message: 14
Date: Tue, 29 Jul 2014 23:46:44 -0400
From: Paul Stoetzer <n8hm@xxxx.xxx>
To: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] WB5H?? on AO-73
Message-ID:
<CABzOSOp57DrbR1r0Mq+LxcY29BiLKFTFJP=Mdsh4tZRBbuN+zw@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
Good evening,
I heard a station calling CQ on CW at the upper end of the passband on
AO-73 at around 0318Z. He drifted up and out of the passband before I
could get the full call, but I'm reasonably certain it was WB5H??.
No other activity but the sound of my voice was heard for the six
usable minutes before the satellite entered sunlight.
Was it anyone here? Or does anyone know who that might have been.
Admittedly, my CW is not very good.
73,
Paul, N8HM
------------------------------
Message: 15
Date: Tue, 29 Jul 2014 21:05:08 -0700
From: Phil Karn <karn@xxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] FM birds
Message-ID: <53D86EF4.5020307@xxxx.xxx>
Content-Type: text/plain; charset=windows-1252
On 07/27/2014 09:57 AM, Jim Sanford wrote:
> Tracking doppler on 2m and 70cm was hard enough at field day. I like
> 2GHz and up, but do not want to even think about the doppler.
At least not with analog modes.
High speed digital is very well suited to microwave in LEO as the link
budgets generally support high data rates even with small antennas and
low powers. And it's the ratio of the Doppler to the symbol rate
(channel bit rate) that matters.
Doppler correction of analog signals is inherently difficult even with
computer tuning for the following reasons:
1. Inexact knowledge of satellite position, especially for high-drag
situations (small cubesats in low orbits).
2. FM can be closed-loop DC tracked if there no low frequency modulating
components, but SSB has no pilot or carrier for closed-loop tracking.
3. Hard-to-model ionospheric delay variations.
Computer tuning of standard analog radios is problematic for the
following additional reasons:
1. Little standardization (none across vendors) in radio control
interfaces. Most seem to still use slow RS-232 type links.
2. No standardization in how the radios respond to a tuning command. How
long does it take to settle on the new frequency? What trajectory does
the instantaneous frequency take to get there?
3. If the signal is an appreciable fraction of the (usually narrow)
receiver bandwidth, frequent retuning is necessary, aggravating the
problems of #2.
A wideband software-defined-radio (SDR) front end operating on a
well-designed digital signal is much better, especially when the A/D
bandwidth is significantly greater than the signal bandwidth (as it
usually is). Then only an occasional and relatively large tuning step
need be made as necessary to keep the signal within the passband.
Most SDRs have fast USB or Ethernet interfaces so the demodulator can
time each retune to occur when it will do the least damage, such as
between frames after frame sync has already been acquired. Even if some
damage is done to the signal, it can usually be corrected by the FEC.
Most SDRs produce a "complex" (two channel, quadrature, I&Q) digital
stream that allows the signal to be converted directly to a
near-zero-frequency IF without zero-frequency folding or aliasing. (This
was a common problem with old analog direct-conversion receivers.) I.e.,
quadrature sampling distinguishes negative and positive frequencies.
The SDR doesn't need to actually keep the incoming frequency exactly
centered at 0 Hz; it only need be somewhere within +/-0.5 times the
sampling rate. For example, the Ettus USRPs being used at Arecibo and
Bochum to receive the ISEE-3 telemetry signal use an effective complex
sampling rate of 250 KHz. As long as the signal is somewhere between
-125 kHz and +125 kHz, nothing is lost.
Like the vast majority of deep space probes ISEE-3 transmits residual
carrier PM, so my first step is to locate the carrier with a FFT. It is
typically around +16 kHz in the Arecibo signals, varying slowly due to
Doppler as the earth turns. I then "spin down" the signal frequency so
that the carrier is at exactly 0 Hz and on the I (inphase) signal axis.
The BPSK data lands on the Q (quadrature) axis, with the sidebands
symmetrical around 0 frequency. I do this by multiplying the input
samples by a complex sinusoid, all in software, set from the results of
the FFT. This gives me extremely precise control of the instantaneous
carrier phase and frequency, with no uncontrolled jumps.
I included a hook, as yet unused, to "chirp" the digitally-generated
carrier precisely in frequency to track slowly varying Doppler. Although
I'm not actually using it yet, I could generate this chirp from
calculations of what the Doppler should be (subject to the above
limitations on knowledge of the orbit, the effects of the ionosphere, etc).
Not only is this a much better way to demodulate satellite signals, but
it can be considerably cheaper too when you eliminate all the
unnecessary components of a typical "conventional" receiver.
The ironic thing is that many modern ham rigs work much like this
internally, but they were designed specifically for the traditional
analog (and slow digital) modes and most don't give the user any easy
way to gain access to the internal DSP mechanisms. They try hard to make
their radios look purely conventional, and they succeed.
Phil
------------------------------
_______________________________________________
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 9, Issue 261
****************************************
Read previous mail | Read next mail
| |
