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CX2SA > SATDIG 14.03.11 18:20l 869 Lines 28744 Bytes #999 (0) @ WW
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To : SATDIG@WW
Today's Topics:
1. Re: Want to see the ND9M/MM QTH? (Ted)
2. Re: FT-8800R new toy (Ari Kosonen)
3. Re: FT-8800R new toy (Gregg Wonderly)
4. VX-8x or TH-D72A, which is better for working satellites?
(Eric Christensen)
5. Re: VX-8x or TH-D72A, which is better for working satellites?
(Andrew Glasbrenner)
6. Re: ISS Digipeaer over Japan (TEMPn-N) (Bob Bruninga )
7. Re: VX-8x or TH-D72A, which is better for working satellites?
(Eric Christensen)
8. ND9M/MM Op Sked: Tonight (Clary, James T, Civilian)
9. Using Preamps In Shack (Paul Delaney - K6HR)
10. Re: Using Preamps In Shack (Mark Spencer)
11. ND9M/MM Op Sked: 14 March (Clary, James T, Civilian)
12. Re: Using Preamps In Shack (Edward R. Cole)
13. National Science Week -Special Event Stations UK (GW1FKY@xxx.xxxx
14. Is it 100% impossible to work a satellite belowthehorizon?
(Ellis Foley)
15. Fair Lawn a Success! (Clint Bradford)
16. Re: Using Preamps In Shack (i8cvs)
----------------------------------------------------------------------
Message: 1
Date: Sun, 13 Mar 2011 12:38:48 -0700
From: "Ted" <k7trkradio@xxxxxxx.xxx>
Subject: [amsat-bb] Re: Want to see the ND9M/MM QTH?
To: <amsat-bb@xxxxxx.xxx>, <amsat-bb@xxxxx.xxx>
Message-ID: <BCAA7BFD20A4486BB922EA393D4BE3A2@xxxxxxxxxxx>
Content-Type: text/plain; charset="us-ascii"
Wow ! not sure I would like to be running around on that heli deck with an
Arrow and my HT !! bet I'd walk right off the edge..Jim defiantly has Sea
Legs !!
Thanks for the pixs Patrick
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of Patrick STODDARD (WD9EWK/VA7EWK)
Sent: Saturday, March 12, 2011 9:59 PM
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Want to see the ND9M/MM QTH?
Hi!
While I was just in California recently, I drove to Oceanside -
along the coast north of San Diego, next to the huge Marine Corps
Base Camp Pendleton. I was hoping to see the USNS Sgt. William
R. Button, the ship Jim ND9M has been on and operating from
lately. After some driving around, I was able to see his ship
offshore on Friday morning before I left the San Diego area.
I had seen photos of the ship on the Internet, so I had an idea
what to look for.
After seeing an e-mail from ND9M on Friday, I considered myself
lucky to see his ship. It had gone out to deeper water, in advance
of the tsunami from the recent earthquake in Japan. It had come
back to its anchorage by the time I went out there. I was able
to see the ship, and took several photos of it in the 1800-1900
UTC (1000-1100 local time) hour. I posted a couple of those
photos at:
http://www.qsl.net/wd9ewk/pics/nd9m/
The first photo was taken at the north end of Oceanside Harbor,
very close to Camp Pendleton. The second photo was taken about
1/2 mile (almost 1km) south of that location, on the beach. The
helicopter deck on the rear of the ship was visible, which is
where Jim has been operating from. These two photos are at a
lower resolution than the original 7-megapixel photos, so they
don't take much time to download. If anyone wants to see the
originals, please e-mail me directly and I'll send them to you.
More information about Jim's ship is available at (among other
places):
http://www.msc.navy.mil/inventory/ships.asp?ship=21
http://en.wikipedia.org/wiki/Maritime_Prepositioning_ship#2nd_Lieutenant_Joh
n_P._Bobo_Class
73!
Patrick WD9EWK/VA7EWK
http://www.wd9ewk.net/
_______________________________________________
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: Sun, 13 Mar 2011 23:28:02 +0200
From: Ari Kosonen <ari.kosonen@xxxxx.xxx>
Subject: [amsat-bb] Re: FT-8800R new toy
To: amsat-bb@xxxxx.xxxx w7lrd@xxxxxxx.xxx
Message-ID:
<AANLkTimAJF3=X5i5tsSznDEV-wiYwkA5S64YvNm5FaYC@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
2011/3/13 Bob- W7LRD <w7lrd@xxxxxxx.xxx>
> Not wanting to reinvent the wheel. Anyone using the FT-8800R mobile for
> satellites have any hints or sugestions, antennas etc. Email direct-thanks.
>
Hi,
I am using FT-8900R (practically same as '8800 plus 6m and 10m) for working
satellites
from my car. My antenna is a Diamond NR770 dualband whip on the trunk lid of
my car.
While this setup is ok for usual mobile FM operation and APRS, it is
probably not optimal
for satellite ops. I have got better results on satellites with a dual band
mag whip on the roof the my car. Especially when the satellite is below ~60
degrees it can be reached easily when
I can hear it (thanks to 50 watts on the uplink). When the sat is higher
than that the whip
is not so good.
I have been working mainly on AO-51 and I have preprogrammed the
uplink/downlink
channel pairs with different doppler values so it is easy to follow the
sweet spot while
the sat first approaches (above the nominal frequency on downlink) and the
starts to fly
away (below the nominal freq). Programming goes easily with FTB8900 software
by
G4HFQ. As same channel pairs are available both on the left and right side
of the
radio, I usually transmit and listen on the left side of the radio and try
to listen my
own signal on downlink with the right side of the rig. With a single mobile
whip
the sensitivity of the downlink rx is usually not good enough during the
transmission.
This might be better with separate antennasa for uplink and downlink.
I have planned to use my Arrow yagi with FT-8900R. As the Arrow's diplexer
is rated only
max 10 watts, I bought 100w rated separate diplexer to be used with '8900
instead.
But I have not tried this combination yet.
73 de Ari OH3KAV / OH7KA
Tampere, Finland (grid: KP11)
------------------------------
Message: 3
Date: Sun, 13 Mar 2011 17:40:33 -0500
From: Gregg Wonderly <greggwon@xxxxx.xxx>
Subject: [amsat-bb] Re: FT-8800R new toy
To: Ari Kosonen <ari.kosonen@xxxxx.xxx>
Cc: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Message-ID: <1F6B79E0-CE8C-412C-85AB-EEA93ACC481F@xxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
For sat ops mobile, you will get the most success out of a 1/4 wave antenna
on a good ground plane. It will give you a hemispherical emission pattern
so that any direction in LOS is equally covered.
Gregg
W5GGW
Sent from my iPhone
On Mar 13, 2011, at 4:28 PM, Ari Kosonen <ari.kosonen@xxxxx.xxx> wrote:
> 2011/3/13 Bob- W7LRD <w7lrd@xxxxxxx.xxx>
>
>> Not wanting to reinvent the wheel. Anyone using the FT-8800R mobile for
>> satellites have any hints or sugestions, antennas etc. Email
direct-thanks.
>>
> Hi,
>
> I am using FT-8900R (practically same as '8800 plus 6m and 10m) for working
> satellites
> from my car. My antenna is a Diamond NR770 dualband whip on the trunk lid of
> my car.
> While this setup is ok for usual mobile FM operation and APRS, it is
> probably not optimal
> for satellite ops. I have got better results on satellites with a dual band
> mag whip on the roof the my car. Especially when the satellite is below ~60
> degrees it can be reached easily when
> I can hear it (thanks to 50 watts on the uplink). When the sat is higher
> than that the whip
> is not so good.
>
> I have been working mainly on AO-51 and I have preprogrammed the
> uplink/downlink
> channel pairs with different doppler values so it is easy to follow the
> sweet spot while
> the sat first approaches (above the nominal frequency on downlink) and the
> starts to fly
> away (below the nominal freq). Programming goes easily with FTB8900 software
> by
> G4HFQ. As same channel pairs are available both on the left and right side
> of the
> radio, I usually transmit and listen on the left side of the radio and try
> to listen my
> own signal on downlink with the right side of the rig. With a single mobile
> whip
> the sensitivity of the downlink rx is usually not good enough during the
> transmission.
> This might be better with separate antennasa for uplink and downlink.
>
> I have planned to use my Arrow yagi with FT-8900R. As the Arrow's diplexer
> is rated only
> max 10 watts, I bought 100w rated separate diplexer to be used with '8900
> instead.
> But I have not tried this combination yet.
>
> 73 de Ari OH3KAV / OH7KA
> Tampere, Finland (grid: KP11)
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 4
Date: Sun, 13 Mar 2011 20:29:21 -0400
From: Eric Christensen <eric@xxxxxxxxxxxxxxxx.xx>
Subject: [amsat-bb] VX-8x or TH-D72A, which is better for working
satellites?
To: amsat-bb@xxxxx.xxx
Message-ID: <1300062561.6795.32.camel@xxxxxxxxx.xxxxxxxxxxx>
Content-Type: text/plain; charset="UTF-8"
I'm thinking about purchasing a couple of new HTs for the XYL and I to
carry around but I'd like to make sure that whatever I get works well
with the birds.
Being that APRS is a must I narrowed down my choices to the Yaesu VX-8DR
and the Kenwood TH-D72A. If I were just using the radio for terrestrial
purposes I'd probably go with the Yaesu as the addition of 6m and 1.25m
is a great feature for me.
If you have one of these units and have used it on the birds I'd love to
hear your feedback.
73,
Eric W4OTN
------------------------------
Message: 5
Date: Sun, 13 Mar 2011 21:28:45 -0400
From: Andrew Glasbrenner <glasbrenner@xxxxxxxxxx.xxx>
Subject: [amsat-bb] Re: VX-8x or TH-D72A, which is better for working
satellites?
To: Eric Christensen <eric@xxxxxxxxxxxxxxxx.xx>
Cc: amsat-bb@xxxxx.xxx
Message-ID: <4D7D6F4D.407@xxxxxxxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
On 3/13/2011 8:29 PM, Eric Christensen wrote:
>
> Being that APRS is a must I narrowed down my choices to the Yaesu VX-8DR
> and the Kenwood TH-D72A.
D-72 is full duplex, and the VX-8 is not. Easy decision if it were mine
to make. Full duplex makes FM birds so much easier, for both the op, and
the other users.
73, Drew KO4MA
------------------------------
Message: 6
Date: Sun, 13 Mar 2011 21:29:36 -0400 (EDT)
From: "Bob Bruninga " <bruninga@xxxx.xxx>
Subject: [amsat-bb] Re: ISS Digipeaer over Japan (TEMPn-N)
To: "Bob Bruninga" <bruninga@xxxx.xxx>, amsat-bb@xxxxx.xxx
Message-ID: <20110313212936.AHV60452@xxxxx.xxxx.xxx>
Content-Type: text/plain; charset=us-ascii
Toyo san,
One last idea.... Every D710 APRS mobile is automatically a digipeater by
default 1) by its own callsign, and 2) in support of TRACEn-N.
So if someone is in a disaster or otherwise out of range of the normal
WIDEn-N network, he can always send his packet via TRACE7-7 and he might get
lucky and hit a nearby D710 or other APRS mobile.
Only the D710 comes with that enabled by defualt (so we can count on it
always being there).. But since 2004 we have requested ALL APRS mobiles
that can digipeat (includes tens of thousands of D700's) to set UITRACE TEMP
so that all mobiles support this path. But not very many people have done
this, so we do not have this reliable invivible backup network in many places.
To understand how it works, see www.aprs.org/TEMPn-N.html
Bob, WB4APR
---- Original message ----
>Date: Sun, 13 Mar 2011 11:28:39 -0400 (EDT)
>From: amsat-bb-bounces@xxxxx.xxx (on behalf of "Bob Bruninga "
<bruninga@xxxx.xxx>)
>Subject: [amsat-bb] Re: ISS Digipeaer over Japan
>To: amsat-bb@xxxxx.xxx
>
>Toyo san,
>
>A few more ideas. It is easy to manually estimate ISS pass times every day
once you have heard a pass.
>See: http://aprs.org/MobileLEOtracking.html
>
>1) ISS over Japan today is between about 0830 to 1830 JST.
>
>2) When you hear the first pass, then you will have additional passes every
91 minutes or so that day.
>
>3) Each day a given GOOD pass is 23 minutes later.
>
>4) But overall-long-term pattern is moving earlier every other day by 51
minutes.
>
>5) So in one week from now, the time window will be 0600 to 1600
>
>6) The pass pattern is about the same. First 2 passes peak to the SE,
then NW. Then a low northern pass, then the last two passes are NE and then
SW.
>
>You can get EXACT pass times from http://heavens-above.com and select a
city. However, this web page does not show the 1 or 2 low passes each day
below 10 degrees elevation.
>
>The problem with using the ISS digipeater is that the survivors in the
devistated area do not know the frequency (145.825). One way to solve this
is to look for opportunity for someone to take a portable digipeater on an
airplane over devistated area. The new TH-D72 HT can digipeat now! So have
someone with a D72 catch a ride in an aircraft one day.
>
>The D72 can BEACON on 144.64 a MESSAGE BULLETIN with info about the ISS
digipeater and the time-window. WHile it is aloft, it can also act as a
digipeater on Japanese APRS channel 144.64 and can also capture a list of
any APRS stations or mobiles on the air.
>
>The short bulletins might say something like this:
>
>TO: BLN1
>MSG: ISS Digi on 145.825 between 0830 to 1830
>
>TO: BLN2
>MSG: Passes are 6 min long every 91 minutes
>
>TO: BLN3
>MSG: Every day, passes are 23 minutes later
>
>TO: BLN4
>MSG: Time window moves EARLIER 51m every 2 days
>
>Keep bulletins to under 45 characters to make sure that every radio display
can see the full bulletin (D7 screen limit).
>
>But in small area like Japan, I think it might be easier just to try to
drive APRS mobiles (acting as digipeaters) to nearby hill tops on 144.64
normal APRS Japanese Frequency and keep everyone on same frequency without
confusion.
>
>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: 7
Date: Sun, 13 Mar 2011 21:34:34 -0400
From: Eric Christensen <eric@xxxxxxxxxxxxxxxx.xx>
Subject: [amsat-bb] Re: VX-8x or TH-D72A, which is better for working
satellites?
To: Andrew Glasbrenner <glasbrenner@xxxxxxxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Message-ID: <1300066474.6795.42.camel@xxxxxxxxx.xxxxxxxxxxx>
Content-Type: text/plain; charset="UTF-8"
On Sun, 2011-03-13 at 21:28 -0400, Andrew Glasbrenner wrote:
> On 3/13/2011 8:29 PM, Eric Christensen wrote:
> >
> > Being that APRS is a must I narrowed down my choices to the Yaesu VX-8DR
> > and the Kenwood TH-D72A.
>
> D-72 is full duplex, and the VX-8 is not. Easy decision if it were mine
> to make. Full duplex makes FM birds so much easier, for both the op, and
> the other users.
>
> 73, Drew KO4MA
Ewww... I didn't know the VX-8 wasn't full duplex. Yeah, full duplex
is definitely a must.
Thanks Drew!
73,
Eric W4OTN
------------------------------
Message: 8
Date: Mon, 14 Mar 2011 02:24:00 -0000
From: "Clary, James T, Civilian" <James.T.Clary.civ@xxx.xxxx.xxx>
Subject: [amsat-bb] ND9M/MM Op Sked: Tonight
To: <amsat-bb@xxxxx.xxx>
Message-ID:
<91BA9771DE57884FBCD59E08A62C65A8881DA0@xxxxxxxxxxxx.xxxxxxxx.xxx.xxxx.xxx>
Content-Type: text/plain; charset="us-ascii"
I'll be QRV from DM11 for one more pass very shortly; this one is VO52
at 14/0229Z. It's a low pass here.
Then the next VO52 pass at 14/0402Z will be the only time I'll be on
from the next grid square south, DM10. After that, I'll be on FO29 from
DL19 at 14/0928Z.
I'll work up an op sked for tomorrow's grids once I check the navigation
charts later this evening.
73,
Jim, ND9M / VQ9JC
Grid DM11
------------------------------
Message: 9
Date: Sun, 13 Mar 2011 21:36:27 -0700
From: "Paul Delaney - K6HR" <paul.hamradio@xxxxxxx.xxx>
Subject: [amsat-bb] Using Preamps In Shack
To: <amsat-bb@xxxxx.xxx>
Message-ID: <B3C2D86D39274F9F9FDCC0AC567A191F@xxxxxx>
Content-Type: text/plain; charset=us-ascii
Does anyone have their preamps in the shack as opposed to mast mount?
Any major disadvantage to having the preamps in the shack?
I just acquired two AR2 SPxxxVDG preamps and understand they are not
weatherproof and would need an enclosure to mount near antennas, which for
the time being is not possible. Any thoughts would be appreciated.
Paul Delaney - K6HR
paul.hamradio@xxxxxxx.xxx
http://k6hr.dyndns.org:8080
------------------------------
Message: 10
Date: Sun, 13 Mar 2011 21:44:31 -0700
From: Mark Spencer <mspencer12345@xxxxx.xx>
Subject: [amsat-bb] Re: Using Preamps In Shack
To: Paul Delaney - K6HR <paul.hamradio@xxxxxxx.xxx>
Cc: "<amsat-bb@xxxxx.xxx>" <amsat-bb@xxxxx.xxx>
Message-ID: <5AD78CA8-A40B-4718-A7EC-371DD9C8BF90@xxxxx.xx>
Content-Type: text/plain; charset=us-ascii
Yes I have done this. The feed line loss will essentially add to the noise
figure of the pre amp, which is not desirable, but in my case with a 70 foot
run of 9913F7 the arr gasfet preamplifier was still worth using on 70 cm.
Sent from my iPad
On 2011-03-13, at 9:36 PM, "Paul Delaney - K6HR" <paul.hamradio@xxxxxxx.xxx>
wrote:
>
> Does anyone have their preamps in the shack as opposed to mast mount?
> Any major disadvantage to having the preamps in the shack?
> I just acquired two AR2 SPxxxVDG preamps and understand they are not
> weatherproof and would need an enclosure to mount near antennas, which for
> the time being is not possible. Any thoughts would be appreciated.
>
> Paul Delaney - K6HR
> paul.hamradio@xxxxxxx.xxx
> http://k6hr.dyndns.org:8080
>
>
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 11
Date: Mon, 14 Mar 2011 06:06:15 -0000
From: "Clary, James T, Civilian" <James.T.Clary.civ@xxx.xxxx.xxx>
Subject: [amsat-bb] ND9M/MM Op Sked: 14 March
To: <amsat-bb@xxxxx.xxx>
Message-ID:
<91BA9771DE57884FBCD59E08A62C65A8881DA3@xxxxxxxxxxxx.xxxxxxxx.xxx.xxxx.xxx>
Content-Type: text/plain; charset="us-ascii"
Today's departure started off with a disappointing run through DM02 when
I couldn't hear AO27 well at all. The satellite only got up to 6 degrees
at my QTH, but I've worked that satellite a lot of times at lower
elevations, so I really couldn't figure out why I had such difficulty.
The next pass was much better, although it didn't help the stations in
the eastern areas that were out of the footprint, but nearly two dozen
stations got DM02 in their logs.
I was able to put DM01 on the air for one full AO27 pass followed by
part of an AO51 pass during which my ship crossed into DM11; several
stations who'd worked me early in the pass called later in the same pass
after I crossed the grid line and got two grids! Later on, I was on from
DM10 as well.
For the oh-dark-thirty bunch, I'll be on FO29 tonight for the only pass
that I'll be on from DL19. Here's the schedule and the grids that I'm
looking (or hoping) to operate from tomorrow:
Planned Passes
FO29 - 14/0938Z - DL19
AO7 - 14/1441Z - DL18
AO51 - 15/0012Z - DL26
FO29 - 15/0022Z - DL26 (after finishing with AO51)
Probable
AO27 - 14/2036Z - DL17, possibly DL27
SO50 - 14/2325Z - DL27
Maybe
VO52 - 14/1555Z - DL18
AO7 - 14/1636Z - DL18
VO52 - 14/1732Z - DL18
AO27 - 14/2216Z - DL26
AO51 - 14/2234Z - DL26
FO29 - 14/2238Z - DL26
73,
Jim, ND9M / VQ9JC
Grid DM10
------------------------------
Message: 12
Date: Sun, 13 Mar 2011 22:54:59 -0800
From: "Edward R. Cole" <kl7uw@xxxxxxxxx.xxx>
Subject: [amsat-bb] Re: Using Preamps In Shack
To: "Paul Delaney - K6HR" <paul.hamradio@xxxxxxx.xxx>,
<amsat-bb@xxxxx.xxx>
Message-ID: <201103140654.p2E6sxta013193@xxxxxx.xxxxxxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"; format=flowed
Paul,
The main advantage of a preamp is increasing your sensitivity by
lowering the noise figure of your receiving system. You lose some of
that by locating the preamp in the shack. Any coax loss between the
preamp and antenna adds directly to the overall NF: 80-foot of
LMR-400 is 1.2 dB loss and added to a 0.5 dB NF preamp nets you a
system NF = 1.2+0.5 = 1.7 dB.
But it will still increase the sensitivity of most radios that have
NF in the 6 to 12 dB range.
Recently I lost one of my eme preamps on my tower and used a preamp
at the shack. My normal system NF = 0.76 dB. In the shack I had
0.25 + 1.7 dB cable loss = 1.95 dB NF. That lowered my sensitivity
by about 5 dB but I still received eme signals.
I would suggest you make a comparison for yourself. Try the preamp
in the shack and try it near the antenna and see how much that
affects your receiving ability. It is not hard to enclose a preamp
inside a plastic box for outside use (a small sandwich box works).
73, Ed - KL7UW
At 08:36 PM 3/13/2011, Paul Delaney - K6HR wrote:
>Does anyone have their preamps in the shack as opposed to mast mount?
>Any major disadvantage to having the preamps in the shack?
>I just acquired two AR2 SPxxxVDG preamps and understand they are not
>weatherproof and would need an enclosure to mount near antennas, which for
>the time being is not possible. Any thoughts would be appreciated.
>
>Paul Delaney - K6HR
>paul.hamradio@xxxxxxx.xxx
>http://k6hr.dyndns.org:8080
>
>
>_______________________________________________
>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
73, Ed - KL7UW, WD2XSH/45
======================================
BP40IQ 500 KHz - 10-GHz www.kl7uw.com
EME: 144-1.4kw, 432-100w, 1296-testing*, 3400-winter?
DUBUS Magazine USA Rep dubususa@xxxxxxx.xxx
======================================
------------------------------
Message: 13
Date: Mon, 14 Mar 2011 09:14:32 -0400 (EDT)
From: GW1FKY@xxx.xxx
Subject: [amsat-bb] National Science Week -Special Event Stations UK
To: amsat-bb@xxxxx.xxxx glyndxis@xxxxxxxx.xxx
Message-ID: <2dedd.371cd1a6.3aaf6eb8@xxx.xxx>
Content-Type: text/plain; charset="US-ASCII"
Hi all,
Apologies for this very late notification.
During this week events are taking place as part of the "National Science
Week " and this years title is
"Communication" - a very significant and key player especially in our
modern day life.
It is also a great opportunity to fly the flag for our hobby "Amateur Radio
" and role that it also plays along with other services.
Here in "Wales" - UK -members of the "Barry Amateur Radio Society " are
putting on two special event stations at separate schools near Cardiff - South
Wales.
The event stations will operate from the schools on Wednesday 16th March
2011, but are restricted to the hours of school attendance.
We will be making a school link up using amateur radio and also
demonstrating the many modes of operation that are now used and how it has
progressed
with technology.
This will also include making contact with as many stations throughout the
world with an exchange of a special QSL card designed by the students of
the schools. They are also competing for an award.
The special event call signs that will be used are GB2SCD and GB2SCP.
I shall be operating with call GB2SCD which is St.Cyres School in Dynas
Powys. Locator: IO81jk
The main operation will be on the HF bands I would also like to make
some contacts using the
amateur satellites available in the timescale.
As I stated we are limited to the hours of school attendance which limits
my operation to available pass
times - Sadly SO-67 is not scheduled for Europe and HO -68 only in beacon
mode.
With the kindness of operators -mainly in Europe - I will try to operated
with a limited set up for the early
passes of AO-7 and VO-52, may also be OK for the first afternoon pass of
AO-51.
To get as many contacts in these short passes I would be obliged if
operators would just confirm their
calls sign and exchange a signal report. My locator as stated is IO81jk.
The second station GB2SCP located in Penarth but will operate HF and
digital modes.
QSL manger for both of these events is: GW0ANA ( Glyn Jones )
Thanking you for your time.
Ken Eaton
GW1FKY
Amsat -UK
Amsat NA
------------------------------
Message: 14
Date: Mon, 14 Mar 2011 07:37:25 -0700 (PDT)
From: Ellis Foley <wa1rks@xxxxx.xxx>
Subject: [amsat-bb] Is it 100% impossible to work a satellite
belowthehorizon?
To: amsat-bb@xxxxx.xxx
Message-ID: <346985.73090.qm@xxxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=iso-8859-1
Return Mail to wa1rks@xxxxx.xxx
Back in the late 70's I was working AO7 mostly on Mode A, two radios,same
stacked 11's,and tri-bander for HF.? had few passes that were below my
horizon,no problem for F2 downlink, but was able to get into it on 2m, with
passive reflections off nearby MT Greylock,from 1100ft el. to 4k el.
discovered it by accident one day, and duplicated it two or three times
after.But only on passes aligned with the reflected 2m uplink.Where there is
a will, there is a way! 73 ud dx'ing! de Ellis/Wa1rks.
------------------------------
Message: 15
Date: Mon, 14 Mar 2011 09:05:11 -0700
From: Clint Bradford <clintbrad4d@xxxxxxxxx.xxx>
Subject: [amsat-bb] Fair Lawn a Success!
To: AMSAT BB <amsat-bb@xxxxx.xxx>
Cc: ARISS-ops OPS <ariss-ops@xxxxx.xxx>
Message-ID: <E57D2EA9-3939-4B93-86AD-FD9A4AC374AC@xxxxxxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
All 10 questions - PLUS one extra - asked and answered.
And as Principal Marcella took the stage, he announced the passing our of
our NASA surveys to complete!
Clint Bradford, K6LCS
NASA / ARISS
909-241-7666
------------------------------
Message: 16
Date: Mon, 14 Mar 2011 17:09:14 +0100
From: "i8cvs" <domenico.i8cvs@xxx.xx>
Subject: [amsat-bb] Re: Using Preamps In Shack
To: "Paul Delaney - K6HR" <paul.hamradio@xxxxxxx.xxx>, "Amsat - BBs"
<amsat-bb@xxxxx.xxx>, "Edward R. Cole" <kl7uw@xxxxxxxxx.xxx>
Message-ID: <009b01cbe262$2a0c1b60$0401a8c0@xxxxxx>
Content-Type: text/plain; charset="iso-8859-1"
----- Original Message -----
From: "Edward R. Cole" <kl7uw@xxxxxxxxx.xxx>
To: "Paul Delaney - K6HR" <paul.hamradio@xxxxxxx.xxx>; <amsat-bb@xxxxx.xxx>
Sent: Monday, March 14, 2011 7:54 AM
Subject: [amsat-bb] Re: Using Preamps In Shack
> Recently I lost one of my eme preamps on my tower and used a preamp
> at the shack. My normal system NF = 0.76 dB. In the shack I had
> 0.25 + 1.7 dB cable loss = 1.95 dB NF. That lowered my sensitivity
> by about 5 dB but I still received eme signals.
>
> 73, Ed - KL7UW
>
Hi Ed, KL7UW
When you write that your sensitivity lowered by about 5 dB you are
absolutely correct and infact I played with numbars to verify your
statement.
Your normal system NF = 0.76 dB
Your normal system noise factor F = 10E (0.76/10) = 1.19
Your normal sys. noise temp. T = ( F-1) x 290 = 0.19 x 290 = 55 kelvin
In the shack system NF = 1.95 dB
In the shack system noise factor F = 10E (1.95/10) = 1.56
In the shack sys noise temp. T = ( F-1) x 290 = 0.56 x 290 = 164 kelvin
Your actual reduction in S/N ratio = 10 log (55 / 164 ) = - 4.74 dB
10
You can check your actual S/N reduction of 4.74 dB receiving Sun Noise
or your own Moon echoes.
By the way a reduction of about 5 dB receiving EME signals is a big S/N
deterioration and so put again the preamplifier at the antenna is mandatory.
When I was on 432 MHz EME early 1977 to 1980 my array was 16 x 21
element yagi and using an antenna mounted home brewed preamplifier
with a GaAsFET V-244 the Sun Noise was about 15 dB at that epoch time
and it was possible for me to receive my own CW echoes from the Moon
Using a more noisy home brewed preamplifier with a bipolar transistor
FJ-203F from Fujitsu antenna mounted the Sun Noise was about 10 dB but
it was absolutely impossible to receive my own echoes from the moon even
using my 1 kW K2RIW power amplifier.
Nice to remember but unfortunately a big storm destroyed my array at the
end of 1980 !
In a separate email I have sent a picture of it.
Best 73" de
i8CVS Domenico
------------------------------
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End of AMSAT-BB Digest, Vol 6, Issue 154
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