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CX2SA > SATDIG 10.05.08 21:19l 154 Lines 4751 Bytes #999 (0) @ WW
BID : 1982_CX2SA
Read: GUEST
Subj: AMSAT-BB-digest V3 236
Path: IZ3LSV<IQ0LT<IK2XDE<DB0RES<ON0AR<HS1LMV<CX2SA
Sent: 080510/1916Z @:CX2SA.LAV.URY.SA #:1982 [Minas] FBB7.00e $:1982_CX2SA
From: CX2SA@CX2SA.LAV.URY.SA
To : SATDIG@WW
Today's Topics:
1. Re: Mode S Antenna question (Edward Cole)
2. AO7 telemetry (w7lrd(AT)comcast.net)
3. AO& DX (w7lrd(AT)comcast.net)
4. Re: AO& DX (w7lrd(AT)comcast.net)
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Message: 1
Date: Sat, 10 May 2008 10:11:44 -0800
From: Edward Cole <kl7uw(AT)acsalaska.net>
Subject: [amsat-bb] Re: Mode S Antenna question
To: Ronald Nutter <rnutter(AT)networkref.com>, amsat-bb(AT)amsat.org
Message-ID: <200805101811.m4AIBjf1005297(AT)iris.acsalaska.net>
Content-Type: text/plain; charset="us-ascii"; format=flowed
At 05:26 AM 5/10/2008, Ronald Nutter wrote:
>I have been using a 2.4 ghz Vagi antenna for my Mode S antenna the past
>few days. I am seeing quite a bit of signal droppout as AO-51 does a
>little rotating. With a circular polarized antenna do any better ? I
>have found a source for a 2.4ghz 10 db RHCP antenna and thought about
>trying that. I know I cant get it before AO-51 goes back to V/U mode
>but thought I could try that next time. The antenna I found has about a
>50 degree pattern so I should get decent coverage since I have it
>pointed at a fixed elevation because I dont have an az/el rotor.
>
>Ron
>KA4KYI
Ron,
From what I have read on what others are using for 2.4 GHz (mode-S)
on AO-51 (or other Leo sats) a 10-dB circular pol. antenna should
work fine. As far as using it without elevation control I cannot
tell you how that will work. Ten dB may be a bit too narrow for best
operation at all elevations. But the gain would be good to have
for the period of time the satellite is within your beam. I believe
Bob Bruninga has found that a fixed elevation of 20-degrees makes a
good solution when not moving elevation.
If the antenna is accessible you can experiment on what angle works
best by trying it at several angles.
I plan to build my self a simple corner reflector fed with a dipole
which should result in about 10-dB gain. I also have an 85cm dish
with helix feed that was used for AO-40. I have two 2.4 -GHz LNA's
and two Drake converters (123-MHz; 435-MHz output) so that any
combination will be possible when all is re-installed. I have full
az-el tracking.
*****************************************************
73, Ed - KL7UW BP40iq, 6m - 3cm
144-EME: FT-847, mgf-1801, 4x-xp20, 185w
http://www.kl7uw.com AK VHF-Up Group
NA Rep. for DUBUS: dubususa(AT)hotmail.com
*****************************************************
------------------------------
Message: 2
Date: Sat, 10 May 2008 18:41:15 +0000
From: w7lrd(AT)comcast.net
Subject: [amsat-bb] AO7 telemetry
To: AMSAT-BB(AT)amsat.org (AMSAT-BB)
Message-ID:
<051020081841.12232.4825EC4B0004956700002FC822155558840B9D04C999(AT)comc
ast.net>
Content-Type: text/plain
Hello
Why does the telemetry on AO7 work sometimes? I ususally take a quick listen,
also does it respond to any comands. In my opinion it's the best satellite we
have up there! You can actually talk to someone for a reasonable amount of
time.
--
73 Bob W7LRD
AMSAT member 28498
Seattle
------------------------------
Message: 3
Date: Sat, 10 May 2008 18:55:26 +0000
From: w7lrd(AT)comcast.net
Subject: [amsat-bb] AO& DX
To: AMSAT-BB(AT)amsat.org (AMSAT-BB)
Message-ID:
<051020081855.6232.4825EF9E000E3BD90000185822155558840B9D04C999(AT)comca
st.net>
Content-Type: text/plain
Hello
Once again Bob I trying to stretch the footprint. From Seattle Wa. CN97 there
is a mutual footprint to Northern Europe at 1918Z, 2110Z, 2305Z. Downlink
145.958 SSB maybe CW, help me make it happen.
73 Bob W7LRD
--
"if this were easy, everyone would be doing it"
------------------------------
Message: 4
Date: Sat, 10 May 2008 18:56:50 +0000
From: w7lrd(AT)comcast.net
Subject: [amsat-bb] Re: AO& DX
To: AMSAT-BB(AT)amsat.org (AMSAT-BB)
Message-ID:
<051020081856.8967.4825EFF20007C8B90000230722155558840B9D04C999(AT)comca
st.net>
Content-Type: text/plain
TYPO this is for AO-7
--
"if this were easy, everyone would be doing it"
-------------- Original message --------------
From: w7lrd(AT)comcast.net
Hello
Once again Bob I trying to stretch the footprint. From Seattle Wa. CN97 there
is a mutual footprint to Northern Europe at 1918Z, 2110Z, 2305Z. Downlink
145.958 SSB maybe CW, help me make it happen.
73 Bob W7LRD
--
"if this were easy, everyone would be doing it"
------------------------------
_______________________________________________
Sent via amsat-bb(AT)amsat.org. Opinions expressed are those of the author.
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End of AMSAT-BB Digest, Vol 3, Issue 236
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