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CX2SA > SATDIG 30.12.08 00:26l 153 Lines 5002 Bytes #999 (0) @ WW
BID : 62607_CX2SA
Read: GUEST
Subj: AMSAT-BB-digest V3 680
Path: IZ3LSV<IK2XDE<DB0RES<DK0WUE<SP7MGD<CX2SA
Sent: 081229/2320Z @:CX2SA.LAV.URY.SA #:62607 [Minas] FBB7.00e $:62607_CX2SA
From: CX2SA@CX2SA.LAV.URY.SA
To : SATDIG@WW
Today's Topics:
1. ISS Repeater (Scott Schmautz)
2. Re: I hear WA4SCA calling CQ via ISS (Alan P. Biddle)
3. ISS Repeater (Ron Miles)
4. Re: ISS Repeater (Ransom, Kenneth G. (JSC-OC)[BAR])
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Message: 1
Date: Mon, 29 Dec 2008 10:29:24 -0500
From: "Scott Schmautz" <wb2uzr@xxxxx.xxx>
Subject: [amsat-bb] ISS Repeater
To: amsat-florida@xxxxx.xxxx amsat-bb@xxxxx.xxx
Message-ID:
<11b740b70812290729q2c759ad5s15c7a6c0b16fa312@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Just heard WA4SCA calling CQ on what I assume is still L/V. Not much else
heard, one other station heard prior to that.
Scott/WB2UZR
--
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Message: 2
Date: Mon, 29 Dec 2008 10:06:45 -0600
From: "Alan P. Biddle" <APBIDDLE@xxxxxx.xxx>
Subject: [amsat-bb] Re: I hear WA4SCA calling CQ via ISS
To: <amsat-bb@xxxxx.xxx>
Message-ID: <FC0090742379430BB443709C22381B00@xxxxxx>
Content-Type: text/plain; charset="us-ascii"
Morning,
Had a great QSO with myself on the 1520 UTC pass. I mostly did some
checking of the home equipment, but have some general thoughts on this mode.
As background, I can get about 50-60 watts to my M2 23CM35EZ linear beam,
rated at 18 dbd.
In comparison with AO-51 L modes, as expected there is little or no "spin
modulation." Obviously the ISS isn't spinning (!!!) and the ISS CP antenna
took care of orientation issues with my beam. I quick BOTE calculation
shows that the shorter path loss due to the lower orbit more than
compensates for the 3 db polarization mismatch. On the other hand, I had to
hit it much harder to get in at all. I am _guessing_ that the squelch is
set tight. (I had full quieting, even when running just barely enough power
to bring up the repeater.) With AO-51 I can work horizon to horizon with
_much_ less than full power, usually 5-10 watts, and a watt or so on an
overhead pass. With the ISS, I needed almost everything below 5 degrees,
though I have a messy, attenuating local horizon. At TCA it still took 5
watts or so to break the squelch. Considering the lossy feed line on the
ISS, my qualitative feeling is this is all in the ballpark.
One thing I did determine is that the uplink frequency needs to be properly
centered. On AO-51 I can go +/- 5 kHz and still get it, whereas with the
ISS I got nothing, even around TCA. +/- 3 kHz is probably more like it, and
of course depends on your power. Probably the RX bandwidth to the ISS rig
is narrower, and of course the signal strength is down for reasons discussed
above.
I know this is out there, but does anybody have off the top of their head a
reference on the ISS antenna orientation, and what its view is WRT the
direction of flight?
Alan
WA4SCA
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Message: 3
Date: Mon, 29 Dec 2008 09:58:48 -0800
From: "Ron Miles" <conimicut@xxxxx.xxx>
Subject: [amsat-bb] ISS Repeater
To: amsat-bb@xxxxx.xxx
Message-ID:
<ca0df3900812290958r100e6390ueeb44aeeb36a90f2@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Heard nothing on the ~16:47UTC pass today. Elevation 47 degrees. Could
not key up the L band repeater at any power level. Yaesu FT 736R set for
67Hz PL tone and using SATPC32 doppler steering frequency pairs:
ISS,145800,1269650,FM,FM,NOR,0,0.
Is uplink tone necessary when operating either ISS L/V or V/U??
Thanks,
Ron n6paa
------------------------------
Message: 4
Date: Mon, 29 Dec 2008 12:31:38 -0600
From: "Ransom, Kenneth G. (JSC-OC)[BAR]" <Kenneth.G.Ransom@xxxx.xxx>
Subject: [amsat-bb] Re: ISS Repeater
To: "Ron Miles" <conimicut@xxxxx.xxx>, <amsat-bb@xxxxx.xxx>
Message-ID:
<A2862DA1C49F4145AF6C2A452829403501C91B05@xxxxxxxxxx.xxx.xxxx.xxx>
Content-Type: text/plain; charset="iso-8859-1"
PL is only required for VHF uplink.
Kenneth - N5VHO
________________________________
From: amsat-bb-bounces@xxxxx.xxx on behalf of Ron Miles
Sent: Mon 12/29/2008 11:58 AM
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] ISS Repeater
Heard nothing on the ~16:47UTC pass today. Elevation 47 degrees. Could
not key up the L band repeater at any power level. Yaesu FT 736R set for
67Hz PL tone and using SATPC32 doppler steering frequency pairs:
ISS,145800,1269650,FM,FM,NOR,0,0.
Is uplink tone necessary when operating either ISS L/V or V/U??
Thanks,
Ron n6paa
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End of AMSAT-BB Digest, Vol 3, Issue 680
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