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CX2SA > SATDIG 12.05.09 01:44l 434 Lines 13749 Bytes #999 (0) @ WW
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To : SATDIG@WW
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Today's Topics:
1. Hygain Sat antenna RC/LC switching (Norman W Osborne)
2. Traffic Relay From Peru (ScottOlitsky@xxx.xxxx
3. Fwd: Final Reminder for 2009 TAPR/AMSAT Banquet at Dayton
Hamvention (Mark Thompson)
4. Call for Papers--2009 ARRL/TAPR Digital Communications
Conference (Mark Thompson)
5. A word of caution - Hygain DB-218SAT Sat Antenna's (Allan Saul)
6. Re: AO-10 (WILLIAMS MICHAEL) (Armando Mercado)
7. shuttle launch (w7lrd@xxxxxxx.xxxx
8. VX-8R (Bob Herrell)
9. Re: VX-8R (Amir Findling K9CHP)
----------------------------------------------------------------------
Message: 1
Date: Sun, 10 May 2009 20:49:46 -0400
From: Norman W Osborne <ve3cje@xxxxx.xxx>
Subject: [amsat-bb] Hygain Sat antenna RC/LC switching
To: AMSAT-BB@xxxxx.xxx
Message-ID:
<4fa78c6b0905101749t528373ap7fb6b0e3092a2b10@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
I have a question about wiring these antenna's for RC/LC switching.
Would there be a problem feeding the power to the relays along the boom (7
foot fiberglass) instead of coming off
the end of the antenna's ?
Also I am going to be using the myer's barbucue dish for 2.4gh antenna,
would like to mount all on
this 7 foot boom, would there be a problem with interaction with the 2m and
440 sat antenna's?
I concerned with the distance between all these antenna's.
Again thank you all for your suggestions.
Norman.
------------------------------
Message: 2
Date: Mon, 11 May 2009 00:02:15 EDT
From: ScottOlitsky@xxx.xxx
Subject: [amsat-bb] Traffic Relay From Peru
To: amsat-bb@xxxxx.xxx
Message-ID: <c92.48d3e4d7.3738fd47@xxx.xxx>
Content-Type: text/plain; charset="US-ASCII"
I will be in Peru next month on the Inca Trail and am considering bringing
my HT. I would like to be able to get messages back to family via email.
Is there anyone in the southern part of the US (possibly Texas?) that could
help me with this? It looks like there would be some footpaths that would
cover several minutes on most days. Please respond directly to me.
Thanks
Scott
AC3A
**************Recession-proof vacation ideas. Find free things to do in
the U.S.
(http://travel.aol.com/travel-ideas/domestic/national-tourism-
week?ncid=emlcntustrav00000002)
------------------------------
Message: 3
Date: Sun, 10 May 2009 20:11:38 -0700 (PDT)
From: Mark Thompson <wb9qzb_groups@xxxxx.xxx>
Subject: [amsat-bb] Fwd: Final Reminder for 2009 TAPR/AMSAT Banquet at
Dayton Hamvention
To: amsat-bb@xxxxx.xxx
Message-ID: <617007.47592.qm@xxxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=iso-8859-1
-----Original Message-----
From: John Ackermann N8UR <jra@xxxx.xxx>
To: tapr-announce@xxxx.xxx
Sent: Wed, 6 May 2009 6:13 pm
Subject: [tapr-announce] Final Reminder: Sign up now for the 2009 TAPR/AMSAT
Banquet at Dayton Hamvention
Time is almost up! Orders for Banquet tickets have to be made by?
Monday, May 11 -- no exceptions!?
----?
2009 TAPR/AMSAT Banquet at Dayton Hamvention?
?
The third annual joint TAPR/AMSAT Banquet will be held Friday evening,?
May 15, 2008 during the Dayton Hamvention.?
?
The Banquet will be in the Jefferson Room at the Kohler Presidential?
Banquet Center, Kettering, OH (just south of Dayton).?
?
Reservations are required and must be made by Monday, 11 May 2009.?
Seating is limited, so make your reservations early.?
?
TICKETS WILL *NOT* BE AVAILABLE AT HAMVENTION; YOU *MUST* REGISTER IN?
ADVANCE!?
?
The price for the Banquet is $30 per person. Reserved tickets may be?
picked up at the AMSAT booth at Hamvention on Friday, or at the door.?
?
You may make reservations for the 2009 TAPR/AMSAT Banquet online in the?
AMSAT Store or contact Martha at the AMSAT office. You can reach Martha?
from 10:00 AM to 6:00 PM EST/EDT at (301) 589-6062, or in the US toll?
free at (888) 322-6728.?
?
For additional information contact Martha at the AMSAT office?
(martha@xxxxx.xxxx.x
?
----?
?
6:30 PM Doors open and Cash bar is available with Beer, Wine, Liquor and?
soft drinks.?
?
7:15 PM Buffet Dinner service begins. The Center has a justly deserved?
reputation for good food and service.?
?
?
_______________________________________________?
tapr-announce mailing list?
?
NOTE: This list includes all addresses currently subscribed to any TAPR
mailing list. Please don't try to manually unsubscribe from this list; it
won't work. If you unsubscribe from all other TAPR mailing lists, you will
automatically be unsubscribed from this one.?
------------------------------
Message: 4
Date: Sun, 10 May 2009 20:13:04 -0700 (PDT)
From: Mark Thompson <wb9qzb_groups@xxxxx.xxx>
Subject: [amsat-bb] Call for Papers--2009 ARRL/TAPR Digital
Communications Conference
To: amsat-bb@xxxxx.xxx
Message-ID: <819650.33485.qm@xxxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=iso-8859-1
Call for Papers--2009 ARRL/TAPR Digital Communications Conference
? ? Posted by: "Ford, Steve,? WB8IMY" sford@xxxx.xxx
? ? Date: Wed May 6, 2009 6:47 am ((PDT))
Technical papers are solicited for presentation at the 28th Annual ARRL
and TAPR Digital Communications Conference to be held September 25-27,
2009 in Chicago, Illinois. These papers will also be published in the
Conference Proceedings (you do NOT need to attend the conference to have
your paper included in the Proceedings). The submission deadline is July
31, 2009. Please send papers to:
Maty Weinberg
ARRL
225 Main St
Newington, CT 06111
or you can make your submission via e-mail to: maty@xxxx.xxx
Papers will be published exactly as submitted and authors will retain
all rights.
73 . . . Steve, WB8IMY
ARRL
------------------------------
Message: 5
Date: Mon, 11 May 2009 07:31:48 +0200
From: Allan Saul <allan@xxxxxxxx.xx.xx>
Subject: [amsat-bb] A word of caution - Hygain DB-218SAT Sat
Antenna's
To: Norman W Osborne <ve3cje@xxxxx.xxx>
Cc: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Message-ID:
<693682E7994243418EFDBB1692138DAC019B124B202D@xxxxx.xxxxxxxx.xx.xx>
Content-Type: text/plain; charset="us-ascii"
Hi Norman,
You mention the use of the Hy-Gain Sat Antennas
in you setup. I was foolish enough to purchase this
Oscar Link combination of the VB-216SAT 2m 16 element
cross Yagi and the UB-7030SAT 70cm Cross Yagi.
The antennas themselves are basically OK, but there
are serious technical issues with the "Polarization Switch"
they supply for changing from LHCP to RHCP.
First of all, as supplied by Hy-Gain, these switches
could never work by design.
Some technical explanation - As the T-Match they use on the
Horizontal and Vertical driven element presents an impedance
of 200 ohms this needs to be transformed at the feed point
down to 50 ohms using a 4:1 balanced to unbalanced balun using
a 1/4 wavelength piece of co-axial. These seem cut to the
right length using the thin RG-316.
As per the Satellite Experimenters Handbook and RSGB VHF/UHF handbook, the
idea is then to transform this 50 ohms
at the feedpoint up to 100 ohms at the switch using a 1/4 wavelength
run of 75 ohms co-ax (normally RG-6/U). The two 100 ohms from the
V and H will them be in parallel and be 50 ohms again.
So what's wrong with the Hy-Gain switches you ask ?
1: They use RF-303/u 50 Ohm cable from the feedpoint baluns to the
Polarization switch, not 75 Ohm cable. This means that at best
you will get a 2:1 VSWR through the switch, even if the antenna
is perfectly matched. This was confirmed by putting the switch
on a Agilent Network Analyzer which I have at work.
2: The cables they use are of equal length. The problem with this
is that when you open the switch up, the designers neglected to
take into account the extra phase delay through the cheap Tyco
Dc relay they use. This meant the phase match between the H and V
was off by at least 40-90 degrees from the ideal 180. This means
those guys using the switch as it exists will have anything but
circular polarization.
To fix the problem I had to practically rebuild the Switching Network by
replacing the RG303 with RG-6. The 1/2 wavelength coax
inside the switch used to add 180 degrees phase also has to be replaced with
RG-6. The 1/4 wave legs then needed to be adjusted by measuring the phase
delay on the Agilent Network Analyzer until you get a perfect 180 degree
switch between RHCP and LHCP.
This a way beyond the capabilities of the average Radio Amateur. Emails sent
to Hy-Gain (MFJ) about this issue went un-answered off course.
Other issues :
1: I found that the 70cm antenna had a VWSR dip at around
440 MHz and nothing I did with the match could get it any lower
2: On one of the feed point baluns the "Red" marking on the
solder lugs was different from the other 3. This means if assembled
as instructed, you would never get circular polarization. There
is no way I could have know this. It was only discovered when I picked out the
Silicone RTV from the balun and saw the
manufacturing mistake on their part.
3: I seriously question the Hy-Gain claim on the data Sheet
"True RF, 50 Ohm switching relays are rated for 200W PEP and contribute to
improved VSWR". They use cheap Tyco DC switching
relays in the design and they are definitely not RF Relays.
My intention is to replace the antennas with the M2 versions
in the summer. From the data sheets and correspondence I have
has with them it looks like they have done the job properly.
73's
Allan Saul
ZS1LS
South Africa.
------------------------------
Message: 6
Date: Mon, 11 May 2009 09:21:22 -0400
From: "Armando Mercado" <am25544@xxxxxx.xxx>
Subject: [amsat-bb] Re: AO-10 (WILLIAMS MICHAEL)
To: <amsat-bb@xxxxx.xxx>
Message-ID: <493B9FA7E7AF46709214DDDCC6AD693B@xxxxx>
Content-Type: text/plain; format=flowed; charset="Windows-1252";
reply-type=original
Hello,
I listened for AO-10 10 May, 2009 at 2100UTC
for about 45 mins. with negative results.
Also had Spectran running and saw nothing
that displayed a dopper shift.
73, Armando N8IGJ
Date: Sun, 10 May 2009 01:22:32 +0200
From: "pb0ahx" <info@xxxxxx.xx>
Subject: [amsat-bb] 1. To: <amsat-bb@xxxxx.xxx>
Message-ID: <C13CDC3076AF43C0956B42FD8D247D8B@xxxxxx>
Content-Type: text/plain; charset="iso-8859-1"
yes the beacon i heard him
last day's
------------------------------
Message: 7
Date: Mon, 11 May 2009 18:12:09 +0000 (UTC)
From: w7lrd@xxxxxxx.xxx
Subject: [amsat-bb] shuttle launch
To: amsat-bb@xxxxx.xxx
Message-ID:
<2069836547.7800141242065529747.JavaMail.root@xxxxxxx.xxxxxxxxxx.xx.xxxx
.xxxxxxx.xxx>
Content-Type: text/plain; charset=utf-8
Just watched?the ?launch on TV.? Fascinating everytime.? Glad I could help
<grin>.
73 Bob W7LRD
------------------------------
Message: 8
Date: Mon, 11 May 2009 11:23:59 -0700 (PDT)
From: Bob Herrell <nk7i@xxxxx.xxx>
Subject: [amsat-bb] VX-8R
To: amsat-bb@xxxxx.xxx
Message-ID: <300391.86148.qm@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
Hi all,
Is anyone using the Yaesu VX-8R for handheld satellite work?
73,
Bob Herrell, AJ5C
AMSAT #36645
------------------------------
Message: 9
Date: Mon, 11 May 2009 14:41:00 -0400
From: Amir Findling K9CHP <sarlabs@xxxxx.xxx>
Subject: [amsat-bb] Re: VX-8R
To: Bob Herrell <nk7i@xxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Message-ID: <4A08713C.9050308@xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Hi Bob:
I have used my VX-8 for satellite work, off a cruise ship, using a Pryme
AL-800 whip. Definitely the bare minimum equipment, but very portable. I
made a few contacts here and there, as time allowed. Ham radio was not
the focus of that trip and I did not want to have to
assemble/disassemble an Arrow or Elk before each pass.
The VX-8 performed very well. Note though that the earphone plug is a
recessed one that likes earphones used by iPods and such. I recommend
using a splitter so you can connect a small voice recorder to record
QSOs. This is much easier than trying to write them on a piece of paper.
Battery life was good (on the 1800 mAmp one).
The only unfortunate thing is that the built-in GPS only gives you your
location in lat/long and not in Maidenhead, so I had to use a different
GPS to get my current location.
* 73 de K9CHP Amir Findling, Member ARRL, ARRL/ W5YI VE, WAC, WAS
* Website: www.K9CHP.net <http://www.k9chp.net> Blog:
http://k9chp.blogspot.com <http://k9chp.blogspot.com/>
* Senior K9 Handler, Eagle Valley Search Dogs http://evdogs.org
<http://evdogs.org/>
* K9 Certification Tester, NYS Federation of SAR Teams
* 1st Special Response Group (1SRG) www.1srg.org <http://www.1srg.org/>
Bob Herrell wrote:
> Hi all,
>
> Is anyone using the Yaesu VX-8R for handheld satellite work?
>
> 73,
> Bob Herrell, AJ5C
> AMSAT #36645
>
>
>
> _______________________________________________
> 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!
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>
------------------------------
_______________________________________________
Sent via amsat-bb@xxxxx.xxx. Opinions expressed are those of the author.
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End of AMSAT-BB Digest, Vol 4, Issue 219
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