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CX2SA > SATDIG 11.11.08 01:47l 589 Lines 17720 Bytes #999 (0) @ WW
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Sent: 081110/2328Z @:CX2SA.LAV.URY.SA #:48280 [Minas] FBB7.00e $:48280_CX2SA
From: CX2SA@CX2SA.LAV.URY.SA
To : SATDIG@WW
Today's Topics:
1. LH or RH in unswitched? (Michael J. Wolthuis)
2. LH or RH circular polarization (Jim Danehy)
3. Re: Stacked loops? (Roger Kolakowski)
4. ao-51 radio programming (Eric Fort)
5. Re: LH or RH in unswitched? (Dave Guimont)
6. Re: ao-51 radio programming (Andrew Glasbrenner)
7. difference between LH and RH Circular Polarization (Jim Danehy)
8. ao-51 radio programming (Eric Fort)
9. Re: ao-51 radio programming (Andrew Glasbrenner)
10. SSTV on AO-51 (John Marranca, Jr)
11. Re: ao-51 radio programming (Gordon JC Pearce MM3YEQ)
12. Re: ao-51 radio programming (Alan P. Biddle)
13. Circular Polarized Antennas For Sale (Don Roland)
14. Re: SSTV on AO-51 (Andrew Glasbrenner)
15. Office Closed (Martha)
16. Re: SSTV on AO-51 (Andrew Glasbrenner)
----------------------------------------------------------------------
Message: 1
Date: Sun, 09 Nov 2008 16:59:19 -0500
From: "Michael J. Wolthuis" <wolthui3@xxx.xxx>
Subject: [amsat-bb] LH or RH in unswitched?
To: amsat-bb@xxxxx.xxx
Message-ID: <49175D37.1060306@xxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
I am building my first set of crossed yagis for sat work. I have the
option when connecting to setup the "unswitched (without DC applied)" to
either Left Hand or Right Hand Circular Polarization.
Which one do I want the unswitched set to? Is there any explination out
there somewhere of how you know what to set it as and when to change it
as a sat flies by?
Thanks for the help BB,
Mike
kb8zgl
------------------------------
Message: 2
Date: Sun, 9 Nov 2008 17:18:58 -0500
From: "Jim Danehy" <jdanehy@xxxxx.xx.xxx>
Subject: [amsat-bb] LH or RH circular polarization
To: <amsat-bb@xxxxx.xxx>
Message-ID: <D422434EF0C942F2A920C58C8084350A@xxxxxxx>
Content-Type: text/plain; charset="iso-8859-1"
Good question. Are you using M Square ? They come with instructions which have
you connect the yagis for RH circular polarization.
The satellites vary as to the "sense" (RH or LH) circular polarization. It
depends on which satellite you are using. That is the broad answer. If you
would want to email off line I would be willing to give you the benefit of my
struggle with the issue. I am no expert on this issue but I have worked
through it with help from some on this BB.
There really is no place for you to go and research which bird is using what.
There are some places which cover a few. The "sense" (RH or LH) is not a
static condition but a dynamic (often changing).
Jim W9VNE
EM 79 tb
------------------------------
Message: 3
Date: Sun, 9 Nov 2008 17:34:38 -0500
From: "Roger Kolakowski" <rogerkola@xxx.xxx>
Subject: [amsat-bb] Re: Stacked loops?
To: "Jim Leder" <k8cxm@xxxx.xxx>, "Amsat" <AMSAT-BB@xxxxx.xxx>
Message-ID: <002001c942bb$5a040420$0200a8c0@xxxxxxxx>
Content-Type: text/plain; charset="iso-8859-1"
I've seen stacked turnstiles...probably in some of the ARRL VHF
literature...might be a good place to start
Roger
WA1KAT
----- Original Message -----
From: "Jim Leder" <k8cxm@xxxx.xxx>
To: "Amsat" <AMSAT-BB@xxxxx.xxx>
Sent: Sunday, November 09, 2008 12:29 PM
Subject: [amsat-bb] Stacked loops?
> This may be a dumb question, but has anyone had any experience or luck
using stacked 432 and 144 loops? Seems they offer a little gain and a nice
omni directional pattern. If they are high enough off the ground, some of
the lesser lobes would point near straight up. I have used a 0 gain dual
band loop (E-factor) with some success on the closer in passes of VO52, FO29
and AO7, but it has been not very effective with AO51. Of course, I know
nothing would compare with a high gain, parasitic array, but not all of us
have the means nor the location to do that. Stacked loops seem like a good
idea, but I've never seen anyone mention it.
>
> Thanks ....
>
> Jim Bob Buckeye
> AKA
> **** Jim Leder****
> K8CXM since 1961
> IBM retiree since 1999
>
> There are 10 types of people in this world -- those who understand binary
> and those who don't.
>
> _______________________________________________
> 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, 9 Nov 2008 14:40:34 -0800
From: "Eric Fort" <eric.fort@xxxxx.xxx>
Subject: [amsat-bb] ao-51 radio programming
To: AMSAT-BB <amsat-bb@xxxxx.xxx>
Message-ID:
<2ad2af430811091440v63de9422x702e0100fbd1296b@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
I have a vx-6 I'd like to set up to work ao-51. what frequency pairs should
go into the memories?
Eric
------------------------------
Message: 5
Date: Sun, 09 Nov 2008 14:45:27 -0800
From: Dave Guimont <dguimon1@xxx.xx.xxx>
Subject: [amsat-bb] Re: LH or RH in unswitched?
To: "Michael J. Wolthuis" <wolthui3@xxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Message-ID:
<20081109224529.YMIW28878.cdptpa-omta02.mail.rr.com@xxxx.xxx.xx.xxx>
Content-Type: text/plain; charset="us-ascii"; format=flowed
>I am building my first set of crossed yagis for sat work. I have the
>option when connecting to setup the "unswitched (without DC applied)" to
>either Left Hand or Right Hand Circular Polarization.
>
>Which one do I want the unswitched set to?
In my experience with various birds RHCP seems to predominate, but
really doesn't make that much difference...power consumption is in mils.
>Is there any explination out
>there somewhere of how you know what to set it as and when to change it
>as a sat flies by?
Your ears will tell you...
73, Dave, WB6LLO
dguimon1@xxx.xx.xxx
Disagree: I learn....
Pulling for P3E...
------------------------------
Message: 6
Date: Sun, 9 Nov 2008 17:48:17 -0500
From: "Andrew Glasbrenner" <glasbrenner@xxxxxxxxxx.xxx>
Subject: [amsat-bb] Re: ao-51 radio programming
To: <eric.fort@xxxxx.xxx>, "AMSAT-BB" <amsat-bb@xxxxx.xxx>
Message-ID: <840130CBB1574ACF9DA8CC0773BB47E6@xxxxxxxxxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
You are likely to get some varying answers, but 145.92 paired with 435.310,
.305, .300, .295, and .290 for the normal repeater, and 145.88 with 435.160,
.155, .150, .145, .140 for the qrp repeater when active. Some folks like to
put in the uplink +/- 5khz Doppler shift too, but it's really fine either
way.
73, Drew KO4MA
----- Original Message -----
From: "Eric Fort" <eric.fort@xxxxx.xxx>
To: "AMSAT-BB" <amsat-bb@xxxxx.xxx>
Sent: Sunday, November 09, 2008 5:40 PM
Subject: [amsat-bb] ao-51 radio programming
>I have a vx-6 I'd like to set up to work ao-51. what frequency pairs
>should
> go into the memories?
>
> Eric
> _______________________________________________
> 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, 9 Nov 2008 18:28:17 -0500
From: "Jim Danehy" <jdanehy@xxxxx.xx.xxx>
Subject: [amsat-bb] difference between LH and RH Circular
Polarization
To: <amsat-bb@xxxxx.xxx>
Message-ID: <7F2FA1BB14E74051B826E6F64B42DB17@xxxxxxx>
Content-Type: text/plain; charset="iso-8859-1"
from experience I can tell you that the difference can be minor to major. On
two meters I have the ability to switch polarity from LH to RH circular
polarization. I have heard differences from ZERO to ~ -30db . . . . . . I am
not currently set up on 440 mhz to switch but should be soon. As an example :
AO 7 will switch polarity on you depending on where it is . . . Western
passes for me indicate that receiving on RH is better but normally LH is used
on AO 7. DO64 is a strange ( interesting ) bird as it changes and changes back
as it goes from one end of the horizon to the other. I have never made a QSO
on DO64 because I have only listened to it when it has been in the beacon mode
. . . again DO 64 is 2 meters and I am only receiving where I only have the
ability to switch senses.
The difference between all vertical and all horizontal is 3 db difference. So
if you are using a vertical antenna and the station you are copying is using a
horizontal you will be 3 db down . . . . circular polarization is used to
mitigate the fading that you will get with using straight vertical or straight
horizontal BUT the kicker is that if you are on the wrong SENSE (that is
the terminology to differentiate) then the down side is up to - 30 db down . .
. . so with circular polarization the downside can be a lot bigger but nil
fading . . . .
I hope this helps
Jim W9VNE
------------------------------
Message: 8
Date: Sun, 9 Nov 2008 19:24:35 -0800
From: "Eric Fort" <eric.fort@xxxxx.xxx>
Subject: [amsat-bb] ao-51 radio programming
To: AMSAT-BB <amsat-bb@xxxxx.xxx>
Message-ID:
<2ad2af430811091924l6a19e4bbhe341e97260dc8a6@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Thanks to all who responded so far. These are the frequencies as I
understand them:
145.92 435.310 not needed for low passes
145.92 435.305
145.92 435.300
145.92 435.295
145.92 435.290 not needed for low passes
qrp repeater
145.88 435.160
145.88 435.155
145.88 435.150
145.88 435.145
145.88 435.140
Does ao-51 need a tone?
also qrp. is that on the satellite end or the ground station end? (to use
the qrp mode do I need flea power and a wet string or an LNA cooled by
liquid helium and a 305M dish? - ok I'm being facicous but you get the
idea...)
Eric
af6ep
Eric
af6ep
On Sun, Nov 9, 2008 at 2:48 PM, Andrew Glasbrenner <
glasbrenner@xxxxxxxxxx.xxx> wrote:
> You are likely to get some varying answers, but 145.92 paired with 435.310,
> .305, .300, .295, and .290 for the normal repeater, and 145.88 with 435.160,
> .155, .150, .145, .140 for the qrp repeater when active. Some folks like to
> put in the uplink +/- 5khz Doppler shift too, but it's really fine either
> way.
>
> 73, Drew KO4MA
>
> ----- Original Message ----- From: "Eric Fort" <eric.fort@xxxxx.xxx>
> To: "AMSAT-BB" <amsat-bb@xxxxx.xxx>
> Sent: Sunday, November 09, 2008 5:40 PM
> Subject: [amsat-bb] ao-51 radio programming
>
>
> I have a vx-6 I'd like to set up to work ao-51. what frequency pairs
>> should
>> go into the memories?
>>
>> Eric
>> _______________________________________________
>> 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: 9
Date: Sun, 9 Nov 2008 22:32:01 -0500
From: "Andrew Glasbrenner" <glasbrenner@xxxxxxxxxx.xxx>
Subject: [amsat-bb] Re: ao-51 radio programming
To: <eric.fort@xxxxx.xxx>, "AMSAT-BB" <amsat-bb@xxxxx.xxx>
Message-ID: <DC7A7A2E7E4246DC8E5624632A2C0B45@xxxxxxxxxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
>
> Does ao-51 need a tone?
Not for the foreseeable future, but it wouldn't hurt to program a 67Hz tone
in case we do go back to using it.
> also qrp. is that on the satellite end or the ground station end? (to use
> the qrp mode do I need flea power and a wet string or an LNA cooled by
> liquid helium and a 305M dish? - ok I'm being facicous but you get the
> idea...)
In this case, QRP means we ask the users to restrict themselves to 10w and
omni or handheld antennas. The satellite output is anywhere from 300 to 800
milliwatts, depending on the current eclipse season.
73, Drew KO4MA
------------------------------
Message: 10
Date: Mon, 10 Nov 2008 06:30:04 -0500
From: "John Marranca, Jr" <jmarranca@xxxxxxxxx.xxx>
Subject: [amsat-bb] SSTV on AO-51
To: amsat-bb <amsat-bb@xxxxx.xxx>
Message-ID:
<8edcdb130811100330uf3e8f5dl75548310f3a0c555@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Good morning everyone!
For this month, AO-51 will be allowing SSTV operation. The AO-51 page says
Robot 36 mode only, but might we use a mode that's even shorter, such as one
of the Black and White modes, as well???
John KB2HSH
--
_______________________________
John Marranca, Jr
PBX Technician/Shop Steward CWA Local 1122
BN Systems, Inc
Orchard Park, NY
(716)972-2006
------------------------------
Message: 11
Date: Mon, 10 Nov 2008 12:14:40 +0000
From: Gordon JC Pearce MM3YEQ <gordonjcp@xxxx.xxx>
Subject: [amsat-bb] Re: ao-51 radio programming
To: amsat-bb@xxxxx.xxx
Message-ID: <491825B0.6090709@xxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Eric Fort wrote:
> Thanks to all who responded so far. These are the frequencies as I
> understand them:
I just stick the up and down frequencies into a memory, and copy the
downlink frequency to the VFO so I can tune in 5kHz steps.
> Does ao-51 need a tone?
>
> also qrp. is that on the satellite end or the ground station end? (to use
> the qrp mode do I need flea power and a wet string or an LNA cooled by
> liquid helium and a 305M dish? - ok I'm being facicous but you get the
> idea...)
I use a homebrew "Arrow"-type antenna with a 3-element 2m yagi and a
5-element 70cm yagi, HB9ABX diplexer and a Kenwood TH-F7E. It's light
and portable enough to aim by hand.
You need a 67Hz subtone to activate the repeater.
Gordon
------------------------------
Message: 12
Date: Mon, 10 Nov 2008 06:21:55 -0600
From: "Alan P. Biddle" <APBIDDLE@xxxxxx.xxx>
Subject: [amsat-bb] Re: ao-51 radio programming
To: "'Gordon JC Pearce MM3YEQ'" <gordonjcp@xxxx.xxx>,
<amsat-bb@xxxxx.xxx>
Message-ID: <C0024F2B60D74245BB7E40601BE45C94@xxxxxx>
Content-Type: text/plain; charset="us-ascii"
Gordon,
They took the tone access off AO-51 almost 2 years ago. Unfortunately, it
is still shown on at least one of the AMSAT-NA pages, but of course it does
not hurt to have a tone on.
Alan
WA4SCA
------------------------------
Message: 13
Date: Mon, 10 Nov 2008 10:47:45 -0400
From: "Don Roland" <dmroland@xx.xxxxx.xxx>
Subject: [amsat-bb] Circular Polarized Antennas For Sale
To: <amsat-bb@xxxxx.xxx>
Message-ID: <000901c94343$7649fd00$ab16ba89@xxxxxxxx>
Content-Type: text/plain; charset="Windows-1252"
I have for sale on Ebay the following two items:
KLM 2M-22C Satellite Circular Polarized 2 Meter Antenna
Item Id: 150308354011
KLM 435-40CX Satellite Circular Polarized 440 MHz Antenna
Item Id: 150308358654
Just put the item ID number into the Ebay search box to
get the details. Both auctions end this coming Wednesday.
Thanks
Don -VE1AOE-
------------------------------
Message: 14
Date: Mon, 10 Nov 2008 10:01:04 -0500
From: "Andrew Glasbrenner" <glasbrenner@xxxxxxxxxx.xxx>
Subject: [amsat-bb] Re: SSTV on AO-51
To: "John Marranca, Jr" <jmarranca@xxxxxxxxx.xxx>, "amsat-bb"
<amsat-bb@xxxxx.xxx>
Message-ID: <178CBA2124CC43B1AFAF49A73A2D9084@xxxxxxxxxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
> For this month, AO-51 will be allowing SSTV operation. The AO-51 page
> says
> Robot 36 mode only, but might we use a mode that's even shorter, such as
> one
> of the Black and White modes, as well???
Just to clarify, we are trying V/U SSTV on the 435.150 downlink this week.
The schedule as posted:
November 10 - November 12
FM Repeater, L/S
Uplink: 1268.700 MHz FM
Downlink: 2401.200 MHz FM
SSTV FM Repeater (Robot 36 only, maximum 1 image transmitted per pass)
Uplink: 145.860 MHz FM
Downlink: 435.150 MHz FM
November 13 - November 16
FM Repeater, V/S
Uplink: 145.880 MHz FM
Downlink: 2401.200 MHz FM
SSTV FM Repeater (Robot 36 only, maximum 1 image transmitted per pass)
Uplink: 145.860 MHz FM
Downlink: 435.150 MHz FM
The intention was to standardize the mode so there is no confusion, and to
include those using the Kenwood VC-H1s. I think we should stick to this for
this session. If there isn't a lot of traffic, I think more than one image
is OK, but we want to give everyone an opportunity to participate. So...use
some common sense if you feel motivated to send more than one image. How
well everyone cooperates using this will determine if and how often the mode
is repeated!
73, Drew KO4MA
AMSAT-NA VP Operations
------------------------------
Message: 15
Date: Mon, 10 Nov 2008 10:33:47 -0500
From: Martha <martha@xxxxx.xxx>
Subject: [amsat-bb] Office Closed
To: "Board of Directors" <bod@xxxxx.xxx>, amsat-bb@xxxxx.xxx
Message-ID:
<956751cf0811100733u5edbb2ebxb73e0c79ea4917c0@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
The AMSAT Office will be closed tomorrow, November 11th in observance of
Veterans' Day
--
73- Martha
------------------------------
Message: 16
Date: Mon, 10 Nov 2008 11:15:18 -0500
From: "Andrew Glasbrenner" <glasbrenner@xxxxxxxxxx.xxx>
Subject: [amsat-bb] Re: SSTV on AO-51
To: <amsat-bb@xxxxx.xxx>
Message-ID: <A9BF08F5B97740A9A42F27D38D54336C@xxxxxxxxxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
That's the intention, I'll clarify on the webpage. If there is no other
activity, more is OK. I just want everyone to have a chance if it gets as
busy as I think it might.
73, Drew
> Drew...
> Is thyat one image per station per pass?
>
------------------------------
_______________________________________________
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 3, Issue 580
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