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CX2SA > SATDIG 30.05.09 23:07l 477 Lines 16234 Bytes #999 (0) @ WW
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Today's Topics:
1. Re: Re eggbeater performance - mobile (Edward Cole)
2. Re: Mobile Coax? (Edward Cole)
3. Re: GO-32 status (Shamai "SAM" Opfer)
4. Re: eggbeater rx performance MM (Gordon JC Pearce)
5. Re: FT-847 vs IC-910 (Art McBride)
6. Re: Re eggbeater performance - mobile (Art McBride)
7. Re: Re eggbeater performance - mobile (Bob Bruninga )
----------------------------------------------------------------------
Message: 1
Date: Sat, 30 May 2009 08:06:32 -0800
From: Edward Cole <kl7uw@xxxxxxxxx.xxx>
Subject: [amsat-bb] Re: Re eggbeater performance - mobile
To: "Bob Bruninga " <bruninga@xxxx.xxx>, mikehooles
<mikehooles@xxxxxxxxxx.xxx>, amsat-bb@xxxxx.xxx
Message-ID: <200905301606.n4UG6Wri002916@xxxx.xxxxxxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"; format=flowed
At 04:19 AM 5/30/2009, Bob Bruninga wrote:
> > For mobile work on AO27, SO50, AO51
> > a 2 metre quarter wave whip is all
> > you need... to work the LEO's mobile
> > and the satellite is 15 degrees or
> > more above the horizon,
>
>Absolutely, For a 19.5" whip in center of roof:
>
>1) Has 5 dBi gain above 20 deg on 2m
>2) Has 7+ dBi gain above 30 deg on 70cm
>3) Is an omni
>4) does not sacrifice 3 dB for circular
>5) Above 25 deg, satellite is 6 to 10 dB closer!
>6) works the birds solid for the center of high passes
>7) Simplicity at its best!
>
>Read about it: www.aprs.org/rotator1.html
>
>Disadvantage: The only disadvantage is TIME. On the above web page
>you can also see that satellites spend 70% of their daily pass times
>below 25 degrees. BUT! For those best passes in the morning and
>the evening (or whenever) you can make solid contacts while mobile
>for about 5 minutes.
>
>Also note, that you do NOT need any tracking program to predict
>passes. AO51 schdule repeats evry 5 days for example. Just write
>down the CENTER pass of the morning and evening for each day for 5
>days. Update those 10 times on a small 3/5" card on the dash about
>once a month or so will predict all passes whenever you are
>mobile. There will be a pass 100 minutes earlier and 100 minutes
>later each day too. So you can predict all 6 passes a day from
>those same 10 times.
>
>See how: www.aprs.org/MobileLEOtracking.html
>
>Bob, WB4APR
I've posted this before, but maybe it helps to repeat. When AO-51
launched, I used a 19-inch mag-mount mobile whip on a steel ground
plane to copy telemetry on 435-MHz using a preamp. Signals were
quite adequate. Probably low horizon AOS/LOS was limited (too long
ago to remember). But very simple to implement and use as Bob
states. I have two Lindenblad antennas under construction so will
play with them (using my 435 preamp) when I get them up. I am
preoccupied with finishing my 1296-eme station with 16-foot dish. In
July, I should be able to re-assemble the old AO-40 tracking
super-array of antenna as can be seen on my website.
***********************************************************
73, Ed - KL7UW BP40iq, 6m - 3cm
144-EME: FT-847, mgf-1801, 4x-xp20, 8877-600w
1296-EME: DEMI-Xvtr, 0.30 dBNF, 4.9m dish, 60/300W (not QRV)
http://www.kl7uw.com AK VHF-Up Group
NA Rep. for DUBUS: dubususa@xxxxxxx.xxx
***********************************************************
------------------------------
Message: 2
Date: Sat, 30 May 2009 08:15:21 -0800
From: Edward Cole <kl7uw@xxxxxxxxx.xxx>
Subject: [amsat-bb] Re: Mobile Coax?
To: Amsat BB <amsat-bb@xxxxx.xxx>
Message-ID: <200905301615.n4UGFLMT003356@xxxx.xxxxxxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"; format=flowed
At 06:48 AM 5/30/2009, Bob Bruninga wrote:
> > Other Car Tips:
> > Convert from RG-58 to LMR-240-UF
> > or RG-213.
>
>I'd take that with a grain of salt. The length of coax in a car is
>about say 10 feet. The loss of 100 feet of RG-58 is say 5 dB? and
>the loss of fancy stuff might be 3 db? But the diffrence for only a
>10 foot run is only .5 dB versus .3 dB or only 0.2 dB. Nothing at
>all to even consider compared to all the work it will take, and the
>lack of flexibility and trying to run something almost like pipe
>through places where a simple wire (RG-58) fits.
>
>My lesson was learned 40 years ago when I go my first 100 lb UHF
>mobile rig (tubes) just after highschool. The boat anchor filled
>the entire trunk of my MGB. But the first thing I did when we go
>the lot of them in my club was spend a day replacing the 8" internal
>piece of RG-58 in mine from the Transmitter output over to the
>chassis connector with a 8" run of RG-8. It was hard work getting
>that 8" piece of RG-8 coax inside the radio and routed all around
>the internal chassis.
>
>The elmer at the time laughed. He said you just wasted a day and
>all that work to save 0.01% of loss. So now your radio works at
>100% where as before it worked at 99.99%. Losing 3 dB of course is
>one thing (50%), but trying to worry about that last 1% when the
>effort is tremendous is just not effective.
>
>Anyway, just my 2 cents...
>
>Bob, Wb4APR
Yep. Commercial NMO mount mobile VHF/UHF antennas typically come
with 17-feet of RG-58 and a connector to install when coax is trimmed
for the particular installation. I have way too many 100w mobile
installs in my past ;-) Of course, FM repeater design is for
overkill on signal margins so no one sweats coax loss for mobiles.
The repeater sites may see 100-150 foot hardline runs, though. I
have one 120-ffot tower with 17 antennas and the coax are 1/2 or 7/8
inch Heliax with the longest run 180-feet.
73, Ed - KL7UW
------------------------------
Message: 3
Date: Sat, 30 May 2009 19:16:28 +0300
From: "Shamai \"SAM\" Opfer" <4z1ws.sam@xxxxx.xxx>
Subject: [amsat-bb] Re: GO-32 status
To: "Mark L. Hammond" <marklhammond@xxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Message-ID:
<e0a093a90905300916h41a48d29r9e1e848ad36d0836@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Hi,
I downloaded and tried to run the program, but it gives me an error message
pop up: "Component 'MSCHRT20.OCX' or one of its dependencies not correctly
registered: a file is missig or invalid". Any idea? (I am running Windows
XP)
thanks & 73
Shamai
4Z1WS
On Thu, May 28, 2009 at 10:14 PM, Mark L. Hammond
<marklhammond@xxxxx.xxx>wrote:
> Hello David,
>
> For what seems like an eternity GO-32 has been sending a telemetry
> packet at 9600 baud one per minute. So, NO, the BBS isn't open (and
> hasn't been for a long time).
>
> You can decode the telemetry GO-32 frames thanks to Mike DK3WN!
> Actually, he has decoders for just about every satellite ever launched
> ;) at http://www.dk3wn.info/software.shtml
>
>
> 73,
> --
> Mark L. Hammond [N8MH]
>
>
>
> ______
>
>
> Hello All,
>
> What is the status of GO-32? Is the BBS back up and running?
>
> 73 de David VK5DG
> _______________________________________________
> 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: Sat, 30 May 2009 17:46:21 +0100
From: Gordon JC Pearce <gordonjcp@xxxx.xxx>
Subject: [amsat-bb] Re: eggbeater rx performance MM
To: Amsat BB <amsat-bb@xxxxx.xxx>
Message-ID: <1243701981.1093.29.camel@xxxxx>
Content-Type: text/plain
On Sat, 2009-05-30 at 07:04 -0700, MM wrote:
> You will need to Pick your orbits in advance. I would usually only
> attempt orbits that were 45 degrees elevation or better from my Car.
Bah. Must be nice to live so far south.
I've only ever heard ISS on voice once, and that was Richard Garriot
talking to a school in the south of England.
Gordon MM3YEQ
------------------------------
Message: 5
Date: Sat, 30 May 2009 10:27:12 -0700
From: "Art McBride" <kc6uqh@xxx.xxx>
Subject: [amsat-bb] Re: FT-847 vs IC-910
To: <APBIDDLE@xxxxxxx.xxx>, <amsat-bb@xxxxx.xxx>
Message-ID: <A33686988EEB4CD89410964124265199@xxxxxx>
Content-Type: text/plain; charset="us-ascii"
To All,
Once the phase noise of local oscillator has been addressed the IF filter
becomes the next most important element in the receiving system for audio
clarity.
Having a flat amplitude response in the filter pass band gives a clear
quality to the voice. Most ceramic filters and some crystal filters have
poor pass band responses leaving the audio on the muddy side. Collins
mechanical filters have for several decades been the benchmark for receiver
IF filter technology.
SDR has eliminated the need for IF filtering at the expense of poor image
responses in cases where high level signals are present in adjacent
channels. SDR works best in satellite and cell phone environments where
signal levels are controlled either by distance or minimum power necessary
for communications.
Amateur radios of the future may emulate cell phone power control
technology, but until that is widely in use, a hybrid system with a roofing
filter and SDR IF currently offers the best performance.
Art, KC6UQH
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of Alan P. Biddle
Sent: Saturday, May 30, 2009 12:29 AM
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: FT-847 vs IC-910
I would also strongly recommend better filters than the stock ceramic
filters to do a comparison. When I bought FT-847 in 1998, Inrad did not
have compatible filters, so I bought the Collins mechanical filters which
were available. I did not do extensive testing, but the HF reception was
remarkably better than the stock filters.
Alan
WA4SCA
_______________________________________________
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------------------------------
Message: 6
Date: Sat, 30 May 2009 10:36:02 -0700
From: "Art McBride" <kc6uqh@xxx.xxx>
Subject: [amsat-bb] Re: Re eggbeater performance - mobile
To: "'Bob Bruninga '" <bruninga@xxxx.xxx>, "'mikehooles'"
<mikehooles@xxxxxxxxxx.xxx>, <amsat-bb@xxxxx.xxx>
Message-ID: <C1E43C50247D4D458307E3D2C172E1E0@xxxxxx>
Content-Type: text/plain; charset="us-ascii"
Bob,
It also has a null on an overhead pass.
Art, KC6UQH.
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of Bob Bruninga
Sent: Saturday, May 30, 2009 5:19 AM
To: mikehooles; amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: Re eggbeater performance - mobile
> For mobile work on AO27, SO50, AO51
> a 2 metre quarter wave whip is all
> you need... to work the LEO's mobile
> and the satellite is 15 degrees or
> more above the horizon,
Absolutely, For a 19.5" whip in center of roof:
1) Has 5 dBi gain above 20 deg on 2m
2) Has 7+ dBi gain above 30 deg on 70cm
3) Is an omni
4) does not sacrifice 3 dB for circular
5) Above 25 deg, satellite is 6 to 10 dB closer!
6) works the birds solid for the center of high passes
7) Simplicity at its best!
Read about it: www.aprs.org/rotator1.html
Disadvantage: The only disadvantage is TIME. On the above web page you can
also see that satellites spend 70% of their daily pass times below 25
degrees. BUT! For those best passes in the morning and the evening (or
whenever) you can make solid contacts while mobile for about 5 minutes.
Also note, that you do NOT need any tracking program to predict passes.
AO51 schdule repeats evry 5 days for example. Just write down the CENTER
pass of the morning and evening for each day for 5 days. Update those 10
times on a small 3/5" card on the dash about once a month or so will predict
all passes whenever you are mobile. There will be a pass 100 minutes
earlier and 100 minutes later each day too. So you can predict all 6 passes
a day from those same 10 times.
See how: www.aprs.org/MobileLEOtracking.html
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
__________ Information from ESET NOD32 Antivirus, version of virus signature
database 4116 (20090529) __________
The message was checked by ESET NOD32 Antivirus.
http://www.eset.com
__________ Information from ESET NOD32 Antivirus, version of virus signature
database 4116 (20090529) __________
The message was checked by ESET NOD32 Antivirus.
http://www.eset.com
------------------------------
Message: 7
Date: Sat, 30 May 2009 14:20:47 -0400 (EDT)
From: "Bob Bruninga " <bruninga@xxxx.xxx>
Subject: [amsat-bb] Re: Re eggbeater performance - mobile
To: "'mikehooles'" <mikehooles@xxxxxxxxxx.xxx>, amsat-bb@xxxxx.xxx
Message-ID: <20090530142047.AJV91346@xxx.xxxxxxx.xxxx.xxx>
Content-Type: text/plain; charset=us-ascii
> It also has a null on an overhead pass.
But that is quite insignificant. Looking at the gain plot of a 3/4 wave
vertical (the 19.5" whip on 70cm) it is only down say 6 to 10 dB above 85
degrees. BUT the satellie is 10 dB or more closer when it is above 50 degrees
which more than makes up for any loss of gain straight up. see plots on
www.aprs.org/rotator1.html
But yes, there can be a complete fade when it is perfectly directly overhead
(extremely rare). But since the satellite is only above 50 degrees only 5% of
the time, it is only above 85 degrees only 1/8th of that 5%, or much less than
1% of all access times. Again, losing less than 1% of access time due to a
possible less than 1% chance of a fade is nothing to be concerned about. Just
2 cents worth...
Bob, Wb4APR
>> For mobile work on AO27, SO50, AO51
>> a 2 meter quarter wave whip is all
>> you need...
>
>Absolutely, For a 19.5" whip in center of roof:
>
>1) Has 5 dBi gain above 20 deg on 2m
>2) Has 7+ dBi gain above 30 deg on 70cm
>3) Is an omni
>4) does not sacrifice 3 dB for circular
>5) Above 25 deg, satellite is 6 to 10 dB closer!
>6) works the birds solid for the center of high passes
>7) Simplicity at its best!
>
>Read about it: www.aprs.org/rotator1.html
>
> Disadvantage: The only disadvantage is TIME.
> On the above web page you can also see that
> satellites spend 70% of their daily pass
> times below 25 degrees. BUT! For those best
> passes in the morning and the evening (or
> whenever) you can make solid contacts while
> mobile for about 5 minutes.
>
> Also note, that you do NOT need any tracking
> program to predict passes. AO51 schdule
> repeats evry 5 days for example. Just write
> down the CENTER pass of the morning and
> evening for each day for 5 days. Update
> those 10 times on a small 3/5" card on the
> dash about once a month or so will predict
> all passes whenever you are mobile. There
> will be a pass 100 minutes earlier and 100
> minutes later each day too. So you can
> predict all 6 passes a day from those same
> 10 times.
>
> See how: www.aprs.org/MobileLEOtracking.html
>
> Bob, WB4APR
------------------------------
_______________________________________________
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 4, Issue 248
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