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CX2SA > SATDIG 29.09.09 21:17l 935 Lines 26810 Bytes #999 (0) @ WW
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To : SATDIG@WW
Today's Topics:
1. quadrafilar helix for 70cm- ambiguous design specs (Tim Goodrich)
2. Re: Cute 1.7 Re-Entry (John Heath)
3. Re: Satellite Orbit Prediction in Python (Josh Smith)
4. Icom 910H for sale (Gordon Bousman)
5. (no subject) (Ronald A. Stunden )
6. FT-897D Fine Tuning (Randy)
7. Sill question (Randy)
8. Fox Delta ST2 (Randy)
9. Re: Sill question (Andrew Glasbrenner)
10. Re: Fox Delta ST2 (Jim Jerzycke)
11. Road trip to DM07 this weekend. (Steve Bluemel)
12. Re: Cute 1.7 Re-Entry (Jeff Yanko)
13. Re: Fox Delta ST2 (Lowell White)
14. Re: quadrafilar helix for 70cm- ambiguous design specs (i8cvs)
15. Re: Fox Delta ST2 (David Wing)
16. RS-22, RS-30, Unid (PY2ZX)
17. Re: quadrafilar helix for 70cm- ambiguous design specs
(Franklyn A. Ballentine, jr)
----------------------------------------------------------------------
Message: 1
Date: Mon, 28 Sep 2009 12:45:38 -0700
From: "Tim Goodrich" <tim@xxxxxxxxxxx.xxx>
Subject: [amsat-bb] quadrafilar helix for 70cm- ambiguous design
specs
To: <amsat-bb@xxxxx.xxx>
Message-ID: <00cf01ca4074$418c2cd0$c4a48670$@xxx>
Content-Type: text/plain; charset="us-ascii"
Hi All,
The house I just bought precludes me from even using my arrow inside as
there must be something un-RF friendly in the walls. Therefore, I was
looking for a roof antenna and the October QST article on the QFH inspired
me to build one. However, after doing some research, I have come up with two
sets of design specs and I'm unsure which one is correct.
I converted everything from you're the 146Mhz QST model to 436Mhz. However,
when I plug that info into http://www.jcoppens.com/ant/qfh/calc.en.php
The values it puts out are different in the "compensated length" field. The
only difference is this model calculates for a full turn as opposed to a
half turn, but the lengths shouldn't be as different as it says. Under the
QST model, I get a wavelength of 688mm, but under the website's model, it
gives me a "compensated wavelength" of 729mm.
The values I used to calculate are:
436
1
1
15
2
.23
Can anyone tell me which specs to use and/or explain this compensated
wavelength issue?
Thank you,
Tim
KI6VBY
------------------------------
Message: 2
Date: Mon, 28 Sep 2009 14:19:24 -0700 (PDT)
From: John Heath <g7hia@xxxxxxxxxx.xxx>
Subject: [amsat-bb] Re: Cute 1.7 Re-Entry
To: Nigel Gunn G8IFF/W8IFF <nigel@xxxxx.xxx>
Cc: Amsat <amsat-bb@xxxxx.xxx>
Message-ID: <576948.94612.qm@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=iso-8859-1
Hi Nigel,
Thanks for alerting me, and the list, to the upcommong re-entry.
I have been tracking the orbital changes of the Castor Pollux pair with an
interest.
Their mass differences are showing up quite clearly in the?Mean Motion.
Cute 1.7 is different again being such a small mass, and adds another level
of interest.
Glad to have your prediction to add to the table.
73 John G7HIA
?
________________________________
From: Nigel Gunn G8IFF/W8IFF <nigel@xxxxx.xxx>
To: John Heath <g7hia@xxxxxxxxxx.xxx>
Cc: Amsat <amsat-bb@xxxxx.xxx>
Sent: Monday, 28 September, 2009 6:36:55 PM
Subject: [amsat-bb] Re: Cute 1.7 Re-Entry
I posted the following on this a week or so ago:
Spacetrack is predicting that CUTE 1.7 will decay on 10th October.
My predix software predicts that the first time the satellite hits terra
firma will be 19th December.
What do others think?
John Heath wrote:
> Hi
>
> Based on day 271 keps from Celestrak the Perigee height? for Cute 1.7
Object 28941 has now dropped below 300km.
>
> Re-entry probably early October. Anyone care to predict the date and time?
>
> If you would,? how about sending it to me off list.? g7hia@xxxxxxxxxx.xxx
I will complile a table and provide a small prize for the person who is
nearest.
>
> Closing date midnight utc last day of September.
>
>
> 73 John G7HIA
>
>
> ------------------------------------------------------------------------
>
> _______________________________________________
> 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
>
>
> ------------------------------------------------------------------------
>
>
> No virus found in this incoming message.
> Checked by AVG - www.avg.com
> Version: 8.5.409 / Virus Database: 270.13.113/2400 - Release Date:
09/28/09 05:51:00
>
--
Nigel A. Gunn,? 1865 El Camino Drive, Xenia, OH 45385-1115, USA.? tel +1 937
825 5032
Amateur Radio G8IFF W8IFF (was KC8NHF),? e-mail nigel@xxxxx.xxxx ? ? www?
http://www.ngunn.net
Member of? ARRL, GQRP #11396, QRPARCI #11644, SOC #548,? Flying Pigs QRP
Club International #385,
? ? ? ? ? ? Dayton ARA #2128, AMSAT-NA LM-1691,? AMSAT-UK 0182, MKARS,? ALC,
GCARES, XWARN.
_______________________________________________
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: Mon, 28 Sep 2009 18:12:18 -0400
From: Josh Smith <juicewvu@xxxxx.xxx>
Subject: [amsat-bb] Re: Satellite Orbit Prediction in Python
To: Bryan Klofas <bklofas@xxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Message-ID:
<d3bf5a870909281512p790dc7a0q369ae23b94ac613e@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
Bryan,
Thanks for the link especially to the source as I am very interested
in implementing something very similar. (for my QTH of course)
Thanks
Josh Smith
KD8HRX
email/jabber: juicewvu@xxxxx.xxx
phone: 304.237.9369(c)
On Mon, Sep 28, 2009 at 2:41 PM, Bryan Klofas <bklofas@xxxxx.xxx> wrote:
> Hey Mark--
>
> We also use pyephem for web-based pass times calculations at Cal Poly.
> http://mstl.atl.calpoly.edu/~ops/passtimes/
>
> Source is here, but it was written a few years back, and uses the older
> (now depreciated) ephem.Body attributes. It also sometimes has trouble
> with the formatting on the webpage, although that may be a firefox bug,
> I'm not sure.
> http://mstl.atl.calpoly.edu/~ops/passtimes/passtimes.py
> --
> Bryan Klofas, KF6ZEO
>
>
> Mark VandeWettering wrote:
>> I just thought I'd drop a quick note here about some fun I've been
>> having today with satellite orbit prediction in Python. ? When I
>> started mucking around with satellites, I used "predict", which was
>> pretty good, but at some point I wanted to answer some questions which
>> weren't easy to answer using predict. ? Questions like "when will
>> AO-51 be visible from both my home in CM87 and locations in Hawaii",
>> or "what was the radius of the circle of visibility for AO-7 compared
>> to ISS"?
>>
>> Luckily, I'm a programmer. ? In fact, I'm a programmer who programs
>> for fun. ? So, I did a bit of research, and then coded up a version of
>> G3RUH's "Plan 13" algorithm in Python, and then wrote some scripts to
>> download elements from celestrak, and then a simple one to print data
>> on the next pass of any named satellite. ? ? And, they worked pretty
>> good. ?I've used them for the last year or so to do all my pass
>> predictions. ? But there are still a couple of minor issues with the
>> library. ?It didn't handle geosynchronous satellites very well. ? It
>> implemented only the most basic of orbital models. ? I was never
>> confident that the "is this satellite in eclipse" stuff working
>> exactly right.
>>
>> Luckily though, it turns out that someone else has been busy writing a
>> more complete library: PyEphem http://rhodesmill.org/pyephem/
>>
>> It's a library whose primary purpose is to calculate the positions of
>> astronomical objects. ? ?I've used it a couple of times to (for
>> instance) figure out the size of Mars compared to Jupiter, and found
>> it very easy to use. ? But today, I realized that it had a full
>> implementation of the SGP4 and SDP4 orbital models built in, and could
>> be used to predict satellite passes. ? ?As a proof of concept, I
>> hacked together a 23 line script that could print the details of
>> upcoming ISS passes. ? It seems to work great, and is really quite
>> easy to use.
>>
>> You can find some of the simple example code at my blog:
>>
>>
http://brainwagon.org/2009/09/27/how-to-use-python-to-predict-satellite-locati
ons/
>>
>> I'll probably be porting all of my existing scripts to use this soon.
>> ?In the mean time, if you have a similar task, you might look to it to
>> solve your custom satellite prediction problems.
>>
>> 73 Mark K6HX
>> _______________________________________________
>> 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
> _______________________________________________
> 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: Mon, 28 Sep 2009 15:12:55 -0700
From: Gordon Bousman <nw7d.ham@xxxxx.xxx>
Subject: [amsat-bb] Icom 910H for sale
To: amsat-bb@xxxxx.xxx
Message-ID:
<9acda2d0909281512s242ea972i782da3bbca62c29b@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
I have relisted my 910H for sale on Ebay ; it has the 1.2 gHz module
installed along with two (2) DSP modules and includes two (2) pre-amps for
mast mounting. The Ebay listing number is 130333300500.
73's Gordon, NW7D
------------------------------
Message: 5
Date: Mon, 28 Sep 2009 16:41:23 -0700
From: "Ronald A. Stunden " <ve7yc@xxxx.xx>
Subject: [amsat-bb] (no subject)
To: amsat-bb@xxxxx.xxx
Message-ID: <4AC149A3.4090403@xxxx.xx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
------------------------------
Message: 6
Date: Mon, 28 Sep 2009 19:55:11 -0400
From: "Randy" <RSwart1@xxxxx.xx.xxx>
Subject: [amsat-bb] FT-897D Fine Tuning
To: <amsat-bb@xxxxx.xxx>
Message-ID: <003e01ca4097$1de69310$0301a8c0@xxxx>
Content-Type: text/plain; charset="us-ascii"
Does the use of a CAT cable and Ham Radio Deluxe allow me to tune the vfo
with
Better resolution than the current 10Hz? That's what I currently get with
the
Dial set to FINE . Ordered the cable and programming software, but was
curious.
I like doing the FMT's and would like to have more resolution ..
Randy - N2CUA
------------------------------
Message: 7
Date: Mon, 28 Sep 2009 19:56:49 -0400
From: "Randy" <RSwart1@xxxxx.xx.xxx>
Subject: [amsat-bb] Sill question
To: <amsat-bb@xxxxx.xxx>
Message-ID: <003f01ca4097$58123cb0$0301a8c0@xxxx>
Content-Type: text/plain; charset="us-ascii"
Has anyone tried any digital modes thru the satellites?
Uhmmm not APRS .. I mean like RTTY or PSK31 ??
I guess you would have to try that on a linear bird ..
But I am guessing that the doppler would be a major problem?
Like I said .. Silly question..
Randy - N2CUA
------------------------------
Message: 8
Date: Mon, 28 Sep 2009 19:58:53 -0400
From: "Randy" <RSwart1@xxxxx.xx.xxx>
Subject: [amsat-bb] Fox Delta ST2
To: <amsat-bb@xxxxx.xxx>
Message-ID: <004001ca4097$a2287440$0301a8c0@xxxx>
Content-Type: text/plain; charset="us-ascii"
I am thinking about getting this interface to control my rotor.
Was wondering if others have it and if so , how do you like it?
Other rotor controller preferences?
Randy - N2CUA
------------------------------
Message: 9
Date: Mon, 28 Sep 2009 21:53:02 -0400
From: Andrew Glasbrenner <glasbrenner@xxxxxxxxxx.xxx>
Subject: [amsat-bb] Re: Sill question
To: RSwart1@xxxxx.xx.xxx
Cc: amsat-bb@xxxxx.xxx
Message-ID: <4AC1687E.5050005@xxxxxxxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Randy wrote:
> Has anyone tried any digital modes thru the satellites?
> Uhmmm not APRS .. I mean like RTTY or PSK31 ??
> I guess you would have to try that on a linear bird ..
> But I am guessing that the doppler would be a major problem?
>
> Like I said .. Silly question..
>
> Randy - N2CUA
>
Hellschreiber works really well, I've used it several times. There has
been a fair amount of SSTV over the years as well.
73, Drew KO4MA
------------------------------
Message: 10
Date: Mon, 28 Sep 2009 19:52:10 -0700 (PDT)
From: Jim Jerzycke <kq6ea@xxxxxxx.xxx>
Subject: [amsat-bb] Re: Fox Delta ST2
To: amsat-bb@xxxxx.xxxx RSwart1@xxxxx.xx.xxx
Message-ID: <740229.75663.qm@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
I bought one a couple of months ago, but haven't had time to build it yet.
Looks very nice, all quality parts, and the shipping was quite fast,
considering it came from India.
Jim KQ6EA
--- On Mon, 9/28/09, Randy <RSwart1@xxxxx.xx.xxx> wrote:
> From: Randy <RSwart1@xxxxx.xx.xxx>
> Subject: [amsat-bb] Fox Delta ST2
> To: amsat-bb@xxxxx.xxx
> Date: Monday, September 28, 2009, 4:58 PM
> I am thinking about getting this
> interface to control my rotor.
> Was wondering if others have it and if so , how do you like
> it?
> Other rotor controller preferences?
>
> Randy - N2CUA
>
>
> _______________________________________________
> 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: Tue, 29 Sep 2009 05:42:42 +0000
From: "Steve Bluemel" <stevebluemel@xxxxx.xxx>
Subject: [amsat-bb] Road trip to DM07 this weekend.
To: amsat-bb@xxxxx.xxx
Message-ID:
<405227837-1254202876-cardhu_decombobulator_blackberry.rim.net-421298510-@xxxx
xx.xxxx.xxxx.xx.xxxxxxxxxx>
Content-Type: text/plain
Hey all,
I will be working every possible pass of ao27, so5o, and ao-51 starting
noonish friday oct 2 pacific time. We will end mid day on sunday.
This and DM08 may be valuable to some. I will sql each call that needs one.
Have a great weekend
Steve. KI6OQU
Sent via BlackBerry by AT&T
------------------------------
Message: 12
Date: Mon, 28 Sep 2009 23:37:26 -0700
From: "Jeff Yanko" <wb3jfs@xxx.xxx>
Subject: [amsat-bb] Re: Cute 1.7 Re-Entry
To: "John Heath" <g7hia@xxxxxxxxxx.xxx>, "Nigel Gunn G8IFF/W8IFF"
<nigel@xxxxx.xxx>
Cc: Amsat <amsat-bb@xxxxx.xxx>
Message-ID: <9D2F36ABAE2E40128E8D6031400EC91F@xxxxxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Reminds me of the Chicken Little Contests when Vern Riportella was around.
It was quite fun.
73,
Jeff WB3JFS
----- Original Message -----
From: "John Heath" <g7hia@xxxxxxxxxx.xxx>
To: "Nigel Gunn G8IFF/W8IFF" <nigel@xxxxx.xxx>
Cc: "Amsat" <amsat-bb@xxxxx.xxx>
Sent: Monday, September 28, 2009 2:19 PM
Subject: [amsat-bb] Re: Cute 1.7 Re-Entry
Hi Nigel,
Thanks for alerting me, and the list, to the upcommong re-entry.
I have been tracking the orbital changes of the Castor Pollux pair with an
interest.
Their mass differences are showing up quite clearly in the Mean Motion.
Cute 1.7 is different again being such a small mass, and adds another level
of interest.
Glad to have your prediction to add to the table.
73 John G7HIA
________________________________
From: Nigel Gunn G8IFF/W8IFF <nigel@xxxxx.xxx>
To: John Heath <g7hia@xxxxxxxxxx.xxx>
Cc: Amsat <amsat-bb@xxxxx.xxx>
Sent: Monday, 28 September, 2009 6:36:55 PM
Subject: [amsat-bb] Re: Cute 1.7 Re-Entry
I posted the following on this a week or so ago:
Spacetrack is predicting that CUTE 1.7 will decay on 10th October.
My predix software predicts that the first time the satellite hits terra
firma will be 19th December.
What do others think?
John Heath wrote:
> Hi
>
> Based on day 271 keps from Celestrak the Perigee height for Cute 1.7
> Object 28941 has now dropped below 300km.
>
> Re-entry probably early October. Anyone care to predict the date and time?
>
> If you would, how about sending it to me off list. g7hia@xxxxxxxxxx.xxx I
> will complile a table and provide a small prize for the person who is
> nearest.
>
> Closing date midnight utc last day of September.
>
>
> 73 John G7HIA
>
>
> ------------------------------------------------------------------------
>
> _______________________________________________
> 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
>
>
> ------------------------------------------------------------------------
>
>
> No virus found in this incoming message.
> Checked by AVG - www.avg.com
> Version: 8.5.409 / Virus Database: 270.13.113/2400 - Release Date:
> 09/28/09 05:51:00
>
--
Nigel A. Gunn, 1865 El Camino Drive, Xenia, OH 45385-1115, USA. tel +1 937
825 5032
Amateur Radio G8IFF W8IFF (was KC8NHF), e-mail nigel@xxxxx.xxx www
http://www.ngunn.net
Member of ARRL, GQRP #11396, QRPARCI #11644, SOC #548, Flying Pigs QRP Club
International #385,
Dayton ARA #2128, AMSAT-NA LM-1691, AMSAT-UK 0182, MKARS, ALC, GCARES,
XWARN.
_______________________________________________
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
_______________________________________________
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: 13
Date: Tue, 29 Sep 2009 08:57:14 -0500
From: "Lowell White" <whiteld@xxx.xxx>
Subject: [amsat-bb] Re: Fox Delta ST2
To: Jim Jerzycke <kq6ea@xxxxxxx.xxx>, <amsat-bb@xxxxx.xxx>,
<RSwart1@xxxxx.xx.xxx>
Message-ID: <129NiCN5o6650S08.1254232634@xxxxxxxx.xxx.xxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
I'm interested in hearing more about it. Please do keep the bb informed.
Enjoy!
Lowell
K9LDW
------ Original Message ------
Received: Mon, 28 Sep 2009 09:56:38 PM CDT
From: Jim Jerzycke <kq6ea@xxxxxxx.xxx>
To: amsat-bb@xxxxx.xxxx RSwart1@xxxxx.xx.xxx
Subject: [amsat-bb] Re: Fox Delta ST2
> I bought one a couple of months ago, but haven't had time to build it yet.
> Looks very nice, all quality parts, and the shipping was quite fast,
considering it came from India.
> Jim KQ6EA
>
> --- On Mon, 9/28/09, Randy <RSwart1@xxxxx.xx.xxx> wrote:
>
> > From: Randy <RSwart1@xxxxx.xx.xxx>
> > Subject: [amsat-bb] Fox Delta ST2
> > To: amsat-bb@xxxxx.xxx
> > Date: Monday, September 28, 2009, 4:58 PM
> > I am thinking about getting this
> > interface to control my rotor.
> > Was wondering if others have it and if so , how do you like
> > it?
> > Other rotor controller preferences?
> >
> > Randy - N2CUA
> >
> >
> > _______________________________________________
> > 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
> >
> _______________________________________________
> 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: 14
Date: Tue, 29 Sep 2009 17:17:35 +0200
From: "i8cvs" <domenico.i8cvs@xxx.xx>
Subject: [amsat-bb] Re: quadrafilar helix for 70cm- ambiguous design
specs
To: "Tim Goodrich" <tim@xxxxxxxxxxx.xxx>, "AMSAT-BB"
<amsat-bb@xxxxx.xxx>
Message-ID: <001501ca4117$f9e57c20$0201a8c0@xxx.xx>
Content-Type: text/plain; charset="iso-8859-1"
----- Original Message -----
From: "Tim Goodrich" <tim@xxxxxxxxxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Sent: Monday, September 28, 2009 9:45 PM
Subject: [amsat-bb] quadrafilar helix for 70cm- ambiguous design specs
> Hi All,
>
> The house I just bought precludes me from even using my arrow inside as
> there must be something un-RF friendly in the walls. Therefore, I was
> looking for a roof antenna and the October QST article on the QFH inspired
> me to build one. However, after doing some research, I have come up with
two
> sets of design specs and I'm unsure which one is correct.
>
>
>
> I converted everything from you're the 146Mhz QST model to 436Mhz.
However,
> when I plug that info into http://www.jcoppens.com/ant/qfh/calc.en.php
>
> The values it puts out are different in the "compensated length" field.
The
> only difference is this model calculates for a full turn as opposed to a
> half turn, but the lengths shouldn't be as different as it says. Under the
> QST model, I get a wavelength of 688mm, but under the website's model, it
> gives me a "compensated wavelength" of 729mm.
>
>
>
> The values I used to calculate are:
>
> 436
>
> 1
>
> 1
>
> 15
>
> 2
>
> .23
>
>
>
> Can anyone tell me which specs to use and/or explain this compensated
> wavelength issue?
>
>
>
> Thank you,
>
> Tim
>
> KI6VBY
>
Hi Tim, KI6VBY
Read please the book "REFLECTION" Transmission Lines and Antennas by
M. Walter Maxwell, W2DU Chapter 22 The Quadrifilar Helix Antenna pages
22-1 to 22-23 and also
"Experimental Investigation of Quadrifilar Helix Antennas for 2400 MHz" The
AMSAT Journal May/June 2004
In a separate email I have sent to you both articles as an attachement.
73" de
i8CVS Domenico
------------------------------
Message: 15
Date: Tue, 29 Sep 2009 08:30:42 -0700
From: "David Wing" <david@xxxxxx.xxx>
Subject: [amsat-bb] Re: Fox Delta ST2
To: <amsat-bb@xxxxx.xxx>
Message-ID: <00353C05D4E34F5C84D59E308ACBA5E0@xxxxx>
Content-Type: text/plain; charset="us-ascii"
I have been using the ST2 for about 6 months...it was very easy to set up
and has worked flawlessly.
73,
David
K6CDW
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of Randy
Sent: Monday, September 28, 2009 4:59 PM
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Fox Delta ST2
I am thinking about getting this interface to control my rotor.
Was wondering if others have it and if so , how do you like it?
Other rotor controller preferences?
Randy - N2CUA
_______________________________________________
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: 16
Date: Tue, 29 Sep 2009 12:59:35 -0300
From: PY2ZX <py2zx.ham@xxxxx.xxx>
Subject: [amsat-bb] RS-22, RS-30, Unid
To: amsat-bb@xxxxx.xxx
Cc: hearsat@xxxxxxx.xxx.xxx
Message-ID: <4AC22EE7.5080503@xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Mike, Andy,
TLM from RS-30 seems to be very similar to RS-22 too.
RS-22, RS-30 and one unidenfied were heard last week:
http://archangelo.net/misc/sat/unk/1/view.htm
Flavio PY2ZX
Andy,
CW telemetry is similar, but not identical
rs30 us160 ibs12 usun0 isun0 itxa8 itxb1 ttxa65 ttxb66 tnap80 tab66 msep0
mcon53 sma83 smb63 mrxa2 mrxb2
rs30 us159 isb12 usun1 isun0 itxa8 itxb0 ttxa65 ttxb66 tnap80 tab66 msep0
mcon53 sma86 smb71 mrxa2 mrxb2
rs28 ubs164 uaba166 uabb166 ibs3 iaba126 iabb126 ispa0 ispb126 taba133
tabb131 tsep136 mcon69 sma138 smb100 mra6 mrb30
rs28 ubs164 uaba172 uabb177 ibs2 iaba134 iabb134 ispa5 ispb133 taba132
tabb131 tsep136 mcon69 sma93 smb82 mra6 mrb30
73, Mike
------------------------------
Message: 17
Date: Tue, 29 Sep 2009 12:45:07 -0400
From: "Franklyn A. Ballentine, jr" <art.ballentine@xxxxx.xxx>
Subject: [amsat-bb] Re: quadrafilar helix for 70cm- ambiguous design
specs
To: i8cvs <domenico.i8cvs@xxx.xx>
Cc: AMSAT-BB <amsat-bb@xxxxx.xxx>
Message-ID:
<da51b1700909290945v7bee08f7r985d6acd70a02ac3@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
I have a question along the same line. Is the QHA in the ARRL
Satellite Handbook \ Antenna handbook, a good starting place?
Thanks,
Frank B.
KB1QZH
On Tue, Sep 29, 2009 at 11:17 AM, i8cvs <domenico.i8cvs@xxx.xx> wrote:
> ----- Original Message -----
> From: "Tim Goodrich" <tim@xxxxxxxxxxx.xxx>
> To: <amsat-bb@xxxxx.xxx>
> Sent: Monday, September 28, 2009 9:45 PM
> Subject: [amsat-bb] quadrafilar helix for 70cm- ambiguous design specs
>
>> Hi All,
>>
>> The house I just bought precludes me from even using my arrow inside as
>> there must be something un-RF friendly in the walls. Therefore, I was
>> looking for a roof antenna and the October QST article on the QFH inspired
>> me to build one. However, after doing some research, I have come up with
> two
>> sets of design specs and I'm unsure which one is correct.
>>
>>
>>
>> ?I converted everything from you're the 146Mhz QST model to 436Mhz.
> However,
>> when I plug that info into http://www.jcoppens.com/ant/qfh/calc.en.php
>>
>> The values it puts out are different in the "compensated length" field.
> The
>> only difference is this model calculates for a full turn as opposed to a
>> half turn, but the lengths shouldn't be as different as it says. Under the
>> QST model, I get a wavelength of 688mm, but under the website's model, it
>> gives me a "compensated wavelength" of 729mm.
>>
>>
>>
>> The values I used to calculate are:
>>
>> 436
>>
>> 1
>>
>> 1
>>
>> 15
>>
>> 2
>>
>> .23
>>
>>
>>
>> Can anyone tell me which specs to use and/or explain this compensated
>> wavelength issue?
>>
>>
>>
>> Thank you,
>>
>> Tim
>>
>> KI6VBY
>>
> Hi Tim, KI6VBY
>
> Read please the book "REFLECTION" Transmission Lines and Antennas by
> M. Walter Maxwell, W2DU Chapter 22 The Quadrifilar Helix Antenna pages
> 22-1 to 22-23 and also
> "Experimental Investigation of Quadrifilar Helix Antennas for 2400 MHz" The
> AMSAT Journal May/June 2004
> In a separate email I have sent to you both articles as an attachement.
>
> 73" de
>
> i8CVS Domenico
>
>
>
> _______________________________________________
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>
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