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CX2SA > SATDIG 08.07.08 23:47l 480 Lines 15628 Bytes #999 (0) @ WW
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Subj: AMSAT-BB-digest V3 338
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Sent: 080708/2153Z @:CX2SA.LAV.URY.SA #:16357 [Minas] FBB7.00e $:16357_CX2SA
From: CX2SA@CX2SA.LAV.URY.SA
To : SATDIG@WW
Today's Topics:
1. F.S. (Anna Osborn)
2. Review of FD ST1 computer interface to Yaesu 5400/5500
rotators (Ronald G. Parsons)
3. Re: Fw: Re: NASA's American Student Moon Orbiter...
(John B. Stephensen)
4. Re: IC-W2A as sat rig? (Chris Maness)
5. Re: IC-W2A as sat rig? (John Mock KD6PAG)
6. Kiwisat Status (Rafael Valdez G.)
7. SSB LNA435 preamp and Arrow Satellite Antenna (Allen Vinegar)
8. blown preamplifier (Angus)
9. G500 / KR500 parts needed (K & R Yoksh)
----------------------------------------------------------------------
Message: 1
Date: Mon, 7 Jul 2008 12:37:13 -0700 (PDT)
From: Anna Osborn <ws4z1(AT)yahoo.com>
Subject: [amsat-bb] F.S.
To: amsat-bb(AT)amsat.org
Message-ID: <423751.65460.qm(AT)web35105.mail.mud.yahoo.com>
Content-Type: text/plain; charset=us-ascii
Yaesu 5400 rotor & control box, fiberglass mast mounted thru rotor, rotor has
mounting bracket, both units mounted togather. Have manual. $350.00
2 mtr 2m-cp22 only 1 circularity. manual. 60.00
KLM 420-450-18c relay & relay box bad. It works in 1 circularity position.
manual, 50.00
Antennas are dismounted, and in 3 sections.
NO SHIPPING, contact off Amsat bb
Pick up in Bushnell, Fl. Abt 60 miles N of Tampa, fl just off I 75.
Anna Osborn,ws4z NA Amsat 1298A ws4z1(AT)yahoo.com Ph.352-793 3439.
.
------------------------------
Message: 2
Date: Mon, 7 Jul 2008 14:58:47 -0500
From: "Ronald G. Parsons" <w5rkn(AT)amsat.org>
Subject: [amsat-bb] Review of FD ST1 computer interface to Yaesu
5400/5500 rotators
To: "amsat-bb" <amsat-bb(AT)amsat.org>
Message-ID: <5706D8A9B0354843B7E6680FF269B472(AT)HPm9080n>
Content-Type: text/plain; charset="iso-8859-1"
I just completed testing of a Fox Delta ST1 computer interface for Yaesu G5400
and G5500 antenna rotators. I purchased this kit as a backup to our GS-232
interface for our ARISS school contact on July 4.
http://www.foxdelta.com/products/st1.htm
The kit was delivered quickly and kit completion took only a couple hours. It
is available with either an RS-232 interface (which I purchased) or a USB
interface (not tested). The only connections required are a serial port on the
computer and a DIN-8 cable to the Yaesu controller. I used SatPC32 software
but it is said to work also with Nova for Windows.
The only calibration required is setting the "OUTPUT VOLTAGE ADJ." for both Az
and El on the Yaesu controller. The instructions say to set this voltage to
4.5V, but with this setting, the controller tried to rotate the antenna beyond
its limit. I got a hint from WA8SME who programmed the PIC firmware to try
increasing the calibration voltage slightly. I found a value of 4.7V worked
properly.
The Az and El rotators are moved sequentially rather that simultaneously as
does the Yaesu GS-232 controller. This slows down large movements in both Az
and El, but since incremental movements are usually small, this should not
matter much.
The unit performed as specified. The price sure beats the Yaesu GS-232 price.
Ron Parsons W5RKN
------------------------------
Message: 3
Date: Tue, 8 Jul 2008 03:20:47 -0000
From: "John B. Stephensen" <kd6ozh(AT)comcast.net>
Subject: [amsat-bb] Re: Fw: Re: NASA's American Student Moon
Orbiter...
To: "i8cvs" <domenico.i8cvs(AT)tin.it>, "AMSAT-BB" <amsat-bb(AT)amsat.org>,
<kl7uw(AT)acsalaska.net>, "Joe" <nss(AT)mwt.net>, "G0MRF David
Bowman"
<g0mrf(AT)aol.com>
Message-ID: <007101c8e0a9$9e85c1c0$0201a8c0(AT)your6bvpxyztoq>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
They're lucky not to live in a restricted area. I had to live with the 1 kW
EIRP restriction for many years. 2 meter or 13 cm uplinks eliminate the
problem.
73,
John
KD6OZH
----- Original Message -----
From: "i8cvs" <domenico.i8cvs(AT)tin.it>
To: "John B. Stephensen" <kd6ozh(AT)comcast.net>; "AMSAT-BB"
<amsat-bb(AT)amsat.org>; <kl7uw(AT)acsalaska.net>; "Joe" <nss(AT)mwt.net>;
"G0MRF
David Bowman" <g0mrf(AT)aol.com>
Sent: Sunday, July 06, 2008 21:35 UTC
Subject: Re: [amsat-bb] Fw: Re: NASA's American Student Moon Orbiter...
> Hi John, KD6OZH
>
> There are many 432 MHz EME stations in USA and probably using big dish
> (33 ft) in the range of 30 dBi gain with a lobe of 5 degrees at -3 dB do
> not
> create interference to PAVE PAWS when the dish is aimed toward the moon.
>
> 73" de
>
> i8CVS Domenico
>
> ----- Original Message -----
> From: "John B. Stephensen" <kd6ozh(AT)comcast.net>
> To: "i8cvs" <domenico.i8cvs(AT)tin.it>; "AMSAT-BB" <amsat-bb(AT)amsat.org>;
> <kl7uw(AT)acsalaska.net>; "Joe" <nss(AT)mwt.net>; "G0MRF David Bowman"
> <g0mrf(AT)aol.com>
> Sent: Sunday, July 06, 2008 2:24 PM
> Subject: Re: [amsat-bb] Fw: Re: NASA's American Student Moon Orbiter...
>
>
>> UV is a problem as hams in much of the U.S. are limited to 1 kW EIRP on
>> 70
>> cm. The military is the primary user of the band. Recently, some
>> repeaters
>> near PAVE PAWS sites have had to reduce power to 5 W due to interference
>> with the return signal from the 4 GW EIRP RADAR.
>>
>> 73,
>>
>> John
>> KD6OZH
>>
>> ----- Original Message -----
>> From: "i8cvs" <domenico.i8cvs(AT)tin.it>
>> To: "AMSAT-BB" <amsat-bb(AT)amsat.org>; <kl7uw(AT)acsalaska.net>; "Joe"
>> <nss(AT)mwt.net>; "G0MRF David Bowman" <g0mrf(AT)aol.com>
>> Sent: Sunday, July 06, 2008 08:53 UTC
>> Subject: [amsat-bb] Fw: Re: NASA's American Student Moon Orbiter...
>>
>>
>> > ----- Original Message -----
>> > From: G0MRF(AT)aol.com
>> > To: nss(AT)mwt.net
>> > Cc: domenico.i8cvs(AT)tin.it ; kl7uw(AT)acsalaska.net
>> > Sent: Saturday, July 05, 2008 1:21 AM
>> > Subject: Re: [amsat-bb] Re: NASA's American Student Moon Orbiter...
>> >
>> >
>> > Hi Joe.
>> >
>> > Looking at 70cm up and 2m down, Dom has shown the 2m path can be
> achieved
>> > with a 13dB gain antenna on the ground and 10 Watts on the satellite.
>> > That's a very small bandwidth transponder
>> >
>> > For the uplink, it's not quite as easy.
>> > I've just run a link budget calculator and it looks like you need
>> > about
>> > 80 Watts and 20dB of antenna gain on 70cm. That produces around 5000
> Watts
>> > ERP (allowing for losses)
>> >
>> > As Dom pointed out, you dont just need a signal thats just above the
>> > noise level at the satellite. Up there you need enough of a signal at
> the
>> > receiver so that the satellites transmitter can generate a decent
>> > amount
>> > of power on 2m.
>> >
>> > The 5kW ERP generates a signal around 16dB above noise at the
> satellite.
>> > With luck, that will be sufficient to produce enough power on the 2m
>> > downlink.
>> >
>> > Of course there are a lot of variables and 'detail' . but 5kW ERP up
> and
>> > a 13dB gain antenna on the downlink are 'In the ballpark' for a minimal
>> > working U/V system.
>> >
>> > Thanks
>> >
>> > David
>> >
>> > Hi David, G0MRF
>> >
>> > Looking at the specifications of AO40 I found that at 435 MHz the
>> > equivalent noise temperature of the RX is
>> > TN (k) = 500 kelvin
>> > The Prx (23) i.e. the power needed by the receiver to develope a
>> > signal
>> > of 23 dB over the noise is -145 dBW
>> > The 435 MHz satellite antenna gain is 14 dBi
>> > It is not specified the transponder output power with a S/N=23 dB
> because
>> > it depends on what transponder is intended to be used for the downlink.
>> > Probably -145 dBW at the RX input is the power needed to get a S/N =
>> > 23
>> > dB at the IF input before to be switched by the matrix to different
>> > transponders.
>> >
>> > By the way the attenuation earth to moon at 435 MHz for 400.000 km is
> 197
>> > dB and going back to calculations
>> > we get :
>> >
>> > TX power at 435 MHz on earth........................ + 20 dBW (100 W)
>> > 435 MHz antenna gain on earth ....................... + 18 dB
>> >
>> > -----------------
>> > EIRP of the ground station................................ + 38 dBW (
> 6.3
>> > kW)
>> >
>> > Attenuation 435 MHz for 400.000 km .............. -197 dB
>> >
>> > ------------------
>> > Power received on a 435 MHz isotropic........... - 159 dBW
>> > antenna at a distance of 400.000 km
>> > Satellite antenna gain ......................................... + 14
> dBi
>> >
>> > ------------------
>> > Received power at RX input for S/N=23 dB.... - 145 dBW
>> >
>> > It seems that both calculations match and 5 kW to 6 kW EIRP up on 70
>> > cm
>> > and 13 dBi antenna gain on the 2 meters downlink are a minimum
>> > necessary
>> > provided that the satellite antennas orbiting around the moon are
>> > constantly directed toward the earth but this is a very difficult task.
>> >
>> > 73" de
>> >
>> > i8CVS Domenico
>> >
>> >
>> >
>> >
>> >
>> >
>> > _______________________________________________
>> > Sent via AMSAT-BB(AT)amsat.org. 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, 7 Jul 2008 21:05:16 -0700
From: "Chris Maness" <christopher.maness(AT)gmail.com>
Subject: [amsat-bb] Re: IC-W2A as sat rig?
To: AMSAT-BB(AT)amsat.org
Message-ID:
<b2e0a4330807072105m1c29fb3dqfa83ca7b1a7d7806(AT)mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
>
> Thanks, John. On further investigation, it seems that
> the W2A will not fully suit my needs, due to an odd
> issue with this rig. It seems that the W2A will work
> cross-band in full duplex mode only, not in half
> duplex (in contrast, the W32A allows you to choose
> between full duplex and half duplex). This means that
> a W2A can only be used for sats with headphones, or
> else there will be feedback. Full duplex with
> headphones is of course the best way to work the sats,
> but sometimes it's just too inconvenient and I'd
> prefer to at least have the option of using the HT on
> half duplex with the speaker. And if the W2A desenses
> as badly as the W32A, then full duplex with headphones
> will be a total waste.
>
> I'll test it out as soon as the charger arrives.
>
> 73, Bill NZ5N
>
I tried this rig (IC-W2A) out tonight on AO-51 and it seemed deaf. I
had a very good pass right over my head, but I could barely hear the
bird. My IC-32AT with the same antenna setup works FB (Arrow
Antenna). Anyone else used the W2A and found that it was lacking in
the sensitivity dept.?
Thanks, Chris KQ6UP
------------------------------
Message: 5
Date: Tue, 08 Jul 2008 07:07:37 -0700
From: John Mock KD6PAG <kd6pag(AT)amsat.org>
Subject: [amsat-bb] Re: IC-W2A as sat rig?
To: amsat-bb(AT)amsat.org
Message-ID: <E1KGDqz-0005RW-Vw(AT)sebastopol.fdns.net>
> I tried this rig (IC-W2A) out tonight on AO-51 and it seemed deaf. I
> had a very good pass right over my head, but I could barely hear the
> bird. My IC-32AT with the same antenna setup works FB (Arrow
> Antenna). Anyone else used the W2A and found that it was lacking in
> the sensitivity dept.?
I used the W2A on AO-27 (which is harder to hear) for several years and
it worked just fine. An Arrow should be good (and is comparable to what
i used). I wonder what was going one...
-- KD6PAG (Networking Old-Timer, Satellite QRPer)
------------------------------
Message: 6
Date: Tue, 8 Jul 2008 08:54:10 -0700
From: "Rafael Valdez G." <rafavaldez(AT)hotmail.com>
Subject: [amsat-bb] Kiwisat Status
To: <amsat-bb(AT)amsat.org>
Message-ID: <BAY111-W2496D1D27929605CD2D013DB970(AT)phx.gbl>
Content-Type: text/plain; charset="iso-8859-1"
For all interested in kiwisat, there is a very nice update in their webpage...
http://www.kiwisat.org.nz/status.html
73's & Dx's
Rafael Valdez Jr.
XE2RV (AT) DL55
10X-52716
QRV V/U Sat
EX-XE2PWF
P Before printing, please think about your responsibilityand commitment with
the ENVIRONMENT. Antes de Imprimir, piensa entu responsabilidad y compromiso
con el MEDIO AMBIENTE
------------------------------
Message: 7
Date: Tue, 8 Jul 2008 13:03:31 -0400
From: "Allen Vinegar" <tokens(AT)myranch.com>
Subject: [amsat-bb] SSB LNA435 preamp and Arrow Satellite Antenna
To: <amsat-bb(AT)amsat.org>
Message-ID: <000d01c8e11c$8d4bfb40$6401a8c0(AT)allen>
Content-Type: text/plain; charset="iso-8859-1"
If I insert an SSB LNA435 preamp between the 70cm antenna and the diplexer
will the suppression of the 2 meter signal from a 5 watt HT be adequate so
that the preamp will not be fried? Or, should I add something like the Ramsey
RF sensing T/R relay to protect the preamp?
Thank you!
73, Al, W8KHP
------------------------------
Message: 8
Date: Tue, 8 Jul 2008 18:29:06 +0100
From: "Angus" <angus(AT)young5769.freeserve.co.uk>
Subject: [amsat-bb] blown preamplifier
To: <amsat-bb(AT)amsat.org>
Message-ID: <CBCD4F0B5F2545ADBA5225F60B0F069E(AT)GusPC>
Content-Type: text/plain; charset="iso-8859-1"
Hi, wonder if anyone has any thoughts on this and what may have happened.
My friend runs a very modest station a 3 element yagi on 2mtrs and 7 ele on
70cms, I think he uses ecoflex 10 coax etc.
He installed a 2mtr preamp which had RF sensing and a BF964 as the active
device inside the preamplifier.
He just this afternoon joined his outers of the coaxes together to form a
common bond, and help reduce his noise figure (which did I think work).
However he has found that the preamplifier has now failed and needs a new
BF964 device fitting.
Anyone know what might have happened?
He was TXing on 2mtrs when the unit failed, what went wrong?
He bonded the outers together at the shack end and the antenna end, and all
seemed fine but obviously something went wrong.
Any thoughts or ideas please let me know and I will try and find him a BF964
and replace it in his preamplifier.
many thanks
regards
Gus M0IKB
--
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------------------------------
Message: 9
Date: Tue, 8 Jul 2008 12:48:23 -0500
From: "K & R Yoksh" <yokshs(AT)sbcglobal.net>
Subject: [amsat-bb] G500 / KR500 parts needed
To: "Amsat BB" <amsat-bb(AT)amsat.org>
Message-ID: <001701c8e122$d1b3fa70$6401a8c0(AT)MAIN>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Hello group,
I've just rebuilt my 'spare' elevation rotator, a Kenpro KR-500. Thanks to
all of those that have
contributed to the knowledge base on these rotators. I found several
articles, including one with very detailed pictures.
I'm planning to swap this one for the Yaesu G500a currently atop the tower.
As you know, these units are identical, and I was hoping someone on the list
had an extra terminal cover (Yaesu p/n s8000279). This is the plastic cover
that protects the terminal strip and wiring from the weather.
Yaesu has discontinued the part, so I was hoping that someone had an extra
or knew of a
source for this part?
I'm also in the market for a set of U-bolts and clamps for the crossboom.
Yaesu has these
in stock, but in case someone wants to sell me these:
U-Bolt s8000223
Clamp s8000224
Please respond off-list to my direct email. Thanks!
73,
Kyle Yoksh
K0KN
Olathe, Kansas
------------------------------
_______________________________________________
Sent via amsat-bb(AT)amsat.org. 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 338
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