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CX2SA > SATDIG 14.07.09 01:01l 404 Lines 14257 Bytes #999 (0) @ WW
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Subj: AMSAT-BB-digest V4 336
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Sent: 090713/2257Z @:CX2SA.LAV.URY.SA #:51140 [Minas] FBB7.00e $:51140-CX2SA
From: CX2SA@CX2SA.LAV.URY.SA
To : SATDIG@WW
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Today's Topics:
1. Packet Operator needed - TN / NC / VA (Bob Bruninga )
2. Polarity switching question (w6zkh@xxxxxxx.xxxx
3. Re: LVB (Howard Long)
4. Re: Polarity switching question (Gordon JC Pearce)
5. Re: Polarity switching question (Nigel Gunn G8IFF/W8IFF)
6. Re: Paccomm information (Howard Long)
7. Delaware Operation FM29ft (John Papay)
8. Pass predictions and differences in software (kd8bxp@xxx.xxxx
9. G5500 Rotor Drift Issue (Mark Spencer)
----------------------------------------------------------------------
Message: 1
Date: Sun, 12 Jul 2009 23:24:12 -0400 (EDT)
From: "Bob Bruninga " <bruninga@xxxx.xxx>
Subject: [amsat-bb] Packet Operator needed - TN / NC / VA
To: amsat-bb@xxxxx.xxx
Message-ID: <20090712232412.AKC43354@xxx.xxxxxxx.xxxx.xxx>
Content-Type: text/plain; charset=us-ascii
AMSAT out-doors operators:
We need a field packet operator on a mountain top near the corner of TN, NC,
VA on the weekend of 26 July.
This is off topic for AMSAT, but we are running out of options to find a
packet operator to drive to the top of Roan Mountain, and operate a portable
D700 packet radio for 4 hours.
This is a critical link in our first attempt on 26 July to digipeat the first
2000 mile golden packet from Georgia to Maine (all RF). We have volunteers
for the other 14 mountain tops (most are drive-up). See the event web pages
starting with the summary:
www.aprs.org/at-golden-packet.html
But due to a fluke with the buraucracy our existing volunteer may need a
backup. See details specifically on Roan Mountain:
www.aprs.org/hamtrails/roan.html
If you have access to a D700 and a 8 amp-hour battery and some kind of
portable 16' mast, and have that Sunday Afternoon free, please let me know.
Sorry for the off topic post, but many AMSAT folks use D700 radios so we need
to ask. They are desired because of consistent performance with packet down to
-117 dBm and are all factory aligned so this eliminates all the problems with
external TNC's on random radios... We only get one shot, and so we need all
14 portable digipeater sites to work with predictible performance!
Bob, WB4APR
------------------------------
Message: 2
Date: Mon, 13 Jul 2009 14:51:30 +0000 (UTC)
From: w6zkh@xxxxxxx.xxx
Subject: [amsat-bb] Polarity switching question
To: amsat-bb <amsat-bb@xxxxx.xxx>
Message-ID:
<205192620.1040621247496690076.JavaMail.root@xxxxxxx.xxxxxxxxxxx.xx.xxxx
.xxxxxxx.xxx>
Content-Type: text/plain; charset=utf-8
I recently obtained a pair of KLM yagi's for satellite work. They both have
the KLM polarity switching box mounted and wired up. Since I havent put them
up yet, and not well versed in the subject, I got out my ohm meter just to see
what was what on this item. I noticed that both driven elements have continuty
to the center pin of the coax at the same time. I was under the impression
that the relay switched back and forth the driven elements to give either RH
or LH polarity. I havent applied the 12 volts to the box yet to check that
out, but was just curious. One thing I have noticed while using the downlink
yagi is that I get very little fade due to polarity when I turn the antenna. I
hope that is a good thing?? I havent checked the uplink yagi to see if it has
the same results.
I hope someone can enlighten me abit.
73 de John W6ZKH
------------------------------
Message: 3
Date: Mon, 13 Jul 2009 15:57:07 +0100
From: "Howard Long" <howard@xxxxxxxxxx.xxx>
Subject: [amsat-bb] Re: LVB
To: "'myles landstein'" <myles.landstein@xxxxx.xxx>,
<amsat-bb@xxxxx.xxx>
Message-ID: <1FF40E51E82644F7B10709BF3453AE9E@xxxxxxx>
Content-Type: text/plain; charset="us-ascii"
Hi Myles
> Just wondering if anyone out there using the LVB, could drop me a
> line and let me know their opinions and experience with it
I can only say good things about the LVB Tracker ;-)
73, Howard G6LVB
------------------------------
Message: 4
Date: Mon, 13 Jul 2009 16:01:06 +0100
From: Gordon JC Pearce <gordonjcp@xxxx.xxx>
Subject: [amsat-bb] Re: Polarity switching question
To: amsat-bb <amsat-bb@xxxxx.xxx>
Message-ID: <1247497266.12932.9.camel@xxxxx>
Content-Type: text/plain
On Mon, 2009-07-13 at 14:51 +0000, w6zkh@xxxxxxx.xxx wrote:
> I recently obtained a pair of KLM yagi's for satellite work. They both
> have the KLM polarity switching box mounted and wired up. Since I
> havent put them up yet, and not well versed in the subject, I got out
> my ohm meter just to see what was what on this item. I noticed that
> both driven elements have continuty to the center pin of the coax at
> the same time. I was under the impression that the relay switched back
> and forth the driven elements to give either RH or LH polarity. I
> havent applied the 12 volts to the box yet to check that out, but was
> just curious. One thing I have noticed while using the downlink yagi
> is that I get very little fade due to polarity when I turn the
> antenna. I hope that is a good thing?? I havent checked the uplink
> yagi to see if it has the same results.
>
> I hope someone can enlighten me abit.
If it's circular-polarised then both elements should be wired, with one
going through a 1/4-wavelength loop of wire. That way, the 90-degree
rotation of the circular polarised signal translates into a 90-degree
phase shift between the horizontal and vertical elements.
Imagine trying to thread a corkscrew through the elements along the
length of the boom, and you'll get it.
Gordon 2M0YEQ
------------------------------
Message: 5
Date: Mon, 13 Jul 2009 15:13:09 +0000
From: Nigel Gunn G8IFF/W8IFF <nigel@xxxxx.xxx>
Subject: [amsat-bb] Re: Polarity switching question
To: w6zkh@xxxxxxx.xxx
Cc: amsat-bb <amsat-bb@xxxxx.xxx>
Message-ID: <4A5B4F05.5050600@xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8; format=flowed
The relay switches the coax between either end of the phasing line.
w6zkh@xxxxxxx.xxx wrote:
> I recently obtained a pair of KLM yagi's for satellite work. They both have
the KLM polarity switching box mounted and wired up. Since I havent put them
up yet, and not well versed in the subject, I got out my ohm meter just to see
what was what on this item. I noticed that both driven elements have continuty
to the center pin of the coax at the same time. I was under the impression
that the relay switched back and forth the driven elements to give either RH
or LH polarity. I havent applied the 12 volts to the box yet to check that
out, but was just curious. One thing I have noticed while using the downlink
yagi is that I get very little fade due to polarity when I turn the antenna. I
hope that is a good thing?? I havent checked the uplink yagi to see if it has
the same results.
>
> I hope someone can enlighten me abit.
>
------------------------------
Message: 6
Date: Mon, 13 Jul 2009 16:38:36 +0100
From: "Howard Long" <howard@xxxxxxxxxx.xxx>
Subject: [amsat-bb] Re: Paccomm information
To: "'johne tds.net'" <johne@xxx.xxx>, <amsat-bb@xxxxx.xxx>
Message-ID: <D6E9B1376CCD4330B607BFA3B7F33F32@xxxxxxx>
Content-Type: text/plain; charset="us-ascii"
Hi John
> Hi I was wondering if some one has any manuals for the DFM TNC and the
PSK-1 or the the PSK-1+?
Sorry for the delay in replying.
Many lunar cycles ago I scanned in the PSK1 manual for someone else on the
reflector. It's not the best quality, but hopefully it will be of some use.
http://www.g6lvb.com/images/psk1.pdf
73, Howard G6LVB
------------------------------
Message: 7
Date: Mon, 13 Jul 2009 12:50:23 -0400
From: John Papay <john@xxxxxx.xxx>
Subject: [amsat-bb] Delaware Operation FM29ft
To: amsat-bb@xxxxx.xxx
Message-ID: <200907131652.n6DGqFIe012297@xxxx.xxxxxxxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"; format=flowed
Our mini WAS-pedition to Wilmington Delaware FM29
ended with the 7/12/2009 1305-1316z AO51
pass which was only 11 degrees in Delaware.
In just two days approximately 85 different
callsigns were logged (including 4 with
KD4ZGW who operated from his 18 wheeler in
DN90, EM38, EM29 and EM65). If you were
thinking that there are only a few regulars
operating the FM birds, this should make you
rethink that notion. For those that are
chasing grids, there are plenty of new people
showing up in grids that have not been very
active. Many of the "regulars" were not on
during this period, but if they were the total
could have easily gone over 100 different
callsigns worked.
My operation took place from the Days Inn tree
lawn on Concord Pike just south of Naamans Rd for
western passes and the Concord Mall parking lot,
about 1000' south for eastern passes. I was
able to make qso's to the west down to about 5
degrees or less. The AO27 pass on 7/11 at 2041-2051z
was only 7 degrees but it did net 4 stations. The
QRM was heavy and my signal was not strong enough
to get through the many stations that were operating.
KI6YAA was heard but could not be worked. But on
Sunday morning, Larry was up at 6am for the AO51
pass (11 degrees for me) and a qso was easily completed.
The early bird still does get the worm.
Several stations including K7WIN and VE6AB mentioned
that Delaware was the last state they needed. It was
great to be able to give them Delaware. Between Jim's
(ND9M) operation and this one, Delaware should be very
low on the most wanted State list.
There will be a special QSL card for this operation.
Cards will be sent to every station that was worked.
There is no need to send a card or an SASE to me although
you can if you want to. I'll put an announcement on the
BB and my QRZ.com page when the cards are mailed. If you
don't get one and think you worked me, please email me.
All passes have been recorded and can be checked.
Thanks to everyone who worked me. If you want to have some
fun on the birds, try operating from a grid away from home.
And thanks to all of you who do activate these grids and help
us with our VUCC!
73,
John K8YSE
------------------------------
Message: 8
Date: Mon, 13 Jul 2009 18:27:42 +0000
From: kd8bxp@xxx.xxx
Subject: [amsat-bb] Pass predictions and differences in software
To: amsat-bb@xxxxx.xxx
Message-ID:
<831519074-1247509646-cardhu_decombobulator_blackberry.rim.net-
989878884-@xxxxxxx.xxxx.xxxx.xx.xxxxxxxxxx>
Content-Type: text/plain; charset="utf-8"
Good afternoon
I am running gpredict on an ubuntu linux box - I am looking at the SO50
satellite -
It is currently 1412 (1812utc) - I advanced the clock of the software forward
by about 3 hrs (1712 local) and see what looks like a great pass on screen
I went to verify using the webbased prediction on the amsat website, and.
Don't see anything in the list of passes even close to what gpredict says will
happen in the future
I updated the keps thinking maybe they were out day, and got the same results
I then fired up my winXP machine and SatPC32 - and got results that are closer
to what the amsat site says.
When looking at real time, all three show the SO50 in just about the same spot
I think I believe the amsat site and satPC32 software.
Not sure of the question to this post - wondering more or less what factors
effect how the pass predictions work. When they (or at least the two I have
control over) have updated keps shouldn't they give the same information or
realitivly close - as I look at the two programs running side by side I do see
slight differences in where SO50 is located on the map currently. But it is
only slight and may have more to do with the scale of the display maps and not
the software.
If I advance the time thou I don't get the same results. And this confuses me
Thanks,
LeRoy, KD8BXP
http://www.HamOhio.com
Sent on the Now Network? from my Sprint? BlackBerry
------------------------------
Message: 9
Date: Mon, 13 Jul 2009 11:42:50 -0700
From: "Mark Spencer" <mspencer@xxxxxx.xxx>
Subject: [amsat-bb] G5500 Rotor Drift Issue
To: <amsat-bb@xxxxx.xxx>
Message-ID: <20090713184301.286E11944AB@xxxxxxxxxxx.x.xxxxxxxxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"
There have been a couple of recent posts about a G5500 voltage drift issue
and some solutions. I'd like to thank those gentlemen for the posts and the
solutions. I am in a unique position to be able to work with nine G5500
rotors side-by-side in preparation for the Teachers Institute II that I will
hold at the end of the week. I noticed the same warm-up/calibration issue
mentioned in the posts. I discovered that it took on average 10 minutes of
warm up time for the voltage to stabilize, and this voltage is the reference
on which the antenna position indications are based. The difference between
the cold start and warm up position was around 10 degrees for AZ and 4
degrees for EL. Minor but irritating. I thought I'd try the easiest
solution suggested first (changing the output cap on the regulator to .1uF)
before I tried the more dramatic solution of changing out the voltage
regulator. I simply tack soldered the .1uF cap on the exposed leads of the
existing .01uF cap, and it worked like a charm. All nine rotor controllers
fire up at 6.12 volts and hold that voltage throughout the operation of the
rotor. This sure will make instruction of rotor setup and calibration a
heck of a lot easier. Thanks for the suggests.
Mark Spencer, WA8SME
ARRL-The national association for Amateur Radio
Education and Technology Program Coordinator
mspencer@xxxx.xxx
http://www.arrl.org/FandES/tbp/
530-495-9150
------------------------------
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End of AMSAT-BB Digest, Vol 4, Issue 336
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