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CX2SA > SATDIG 01.08.13 21:00l 287 Lines 9326 Bytes #999 (0) @ WW
BID : AMSATBB8249
Read: GUEST
Subj: AMSAT-BB-digest V8 249
Path: IZ3LSV<IK2XDE<ON4HU<CX2ACB<CX2SA
Sent: 130801/1902Z @:CX2SA.SAL.URY.SA #:9213 [Salto] FBB7.00e $:AMSATBB8249
From: CX2SA@CX2SA.SAL.URY.SA
To : SATDIG@WW
Today's Topics:
1. Re: Alpha Spid Big-RAS AZ & EL Rotator (Sion Chow Q. C. (9W2QC))
2. D Star net (damon runion)
3. Re: D-STAR net (Dennis Griffin)
4. Re: V/U Linear Transponder (William Leijenaar)
----------------------------------------------------------------------
Message: 1
Date: Wed, 31 Jul 2013 20:17:03 -0400
From: "Sion Chow Q. C. (9W2QC)" <9w2qc@xxxxx.xxx>
To: Stefan Wagener <wageners@xxxxx.xxx>
Cc: AMSAT BB <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: Alpha Spid Big-RAS AZ & EL Rotator
Message-ID: <20130731201703.200024q6vkq0i9ms@xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; DelSp="Yes";
format="flowed"
Hi Stefan,
Thank you for the reply and also to those who have replied privately.
I have taken a look the high resolution version and though I agree
that this is a better option to go, cost is unfortunately prohibitive
at this time. Anyhow will still re-evaluate the options and perhaps
in a long run this would better, since I have intention to work EME in
the future.
73, Sion, 9M2CQC, WQ2C
Quoting Stefan Wagener <wageners@xxxxx.xxx>:
> Hi Sion,
>
> Look at the images at:
> http://www.rfhamdesign.com/products/antennerotor/bigrashr/index.html
>
> there is one picture with the terminal box open on the rotor. Also, the
> rotors are now available with a high resolution option (0.1 degree). If you
> get a new one, might as well do that. We are planning on doing the same for
> a station here in Winnipeg. Also, compare prices for the rotor. Even with
> shipping and taxes the above mentioned source is still far less expensive
> then anyone in NA.
>
> Hope that helps,
>
> Stefan VE4NSA
>
>
> On Wed, Jul 31, 2013 at 3:11 AM, Sion Chow Q. C. (9W2QC)
> <9w2qc@xxxxx.xxx>wrote:
>
>> Dear All,
>>
>> I understand that the Alpha Spid Big-RAS AZ & EL Rotator requires 4
>> control cables each for it Azimuth and Elevation control.
>>
>> However, I am not able to find out if the connector on the outdoor rotator
>> end consist of 2 separate connectors for the AZ and EL motor (like the
>> Yaesu G-5500) or if they are connected all together at one point. Also
>> would be great if someone could advice if the connection point consists of
>> screw on terminals or some kind of connector plug is used.
>>
>> This is in preparation of ISS HAM TV reception and would like to
>> understand the above before deciding if I should purchase this rotor.
>>
>> Thank you.
>>
>> 73,
>> Sion Chow Q. C.,
>> 9M2CQC, WQ2C
>>
>> ______________________________**_________________
>> 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<http://amsat.org/mailman/listinfo
/amsat-bb>
>>
>
------------------------------
Message: 2
Date: Thu, 1 Aug 2013 08:21:31 -0500
From: damon runion <damonwa4hfn@xxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] D Star net
Message-ID:
<CACNBj2pmRCkrLhdBQ-7Vk31y+XYwK=nugKX_tjOC_t3zfJ5mZQ@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
D Star Amsat users net tonight at
01;00 UTC on REF 60 B
Hope to see you there with news about grid trips new operators and
things you may want to sell or buy
Damon
WA4HFN em55
Memphis, TN
------------------------------
Message: 3
Date: Thu, 1 Aug 2013 08:39:08 -0700
From: Dennis Griffin <eagleeyedennis@xxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: D-STAR net
Message-ID: <C269ADF3-CF28-4D23-9553-E92773F4A936@xxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
FYI, D-STAR is an acronym for Digital Smart Technology for Amateur Radio,
just as AMSAT is an acronym, and to save confusion, acronyms should always
be expressed in all caps.
73 de Dennis KD7CAC
Scottsdale, AZ
------------------------------
Message: 4
Date: Thu, 1 Aug 2013 05:26:52 -0700 (PDT)
From: William Leijenaar <leijenaarelectronics@xxxxx.xxx>
To: Tanan Rangseeprom HS1JAN <hs1jan@xxxxxx.xxx>, "amsat-bb@xxxxx.xxxx
<amsat-bb@xxxxx.xxx>, PE1RDW <sats@xxxxxx.xxxxx.xx>, "g0mrf@xxx.xxxx
<g0mrf@xxx.xxx>
Cc: "hs2jfw@xxxxx.xxxx <hs2jfw@xxxxx.xxx>, "hs5igy@xxxxxxx.xxxx
<hs5igy@xxxxxxx.xxx>, "chawalit@xxxxxxx.xx.xxx
<chawalit@xxxxxxx.xx.xx>, "thidad1@xxxxx.xxxx <thidad1@xxxxx.xxx>
Subject: [amsat-bb] Re: V/U Linear Transponder
Message-ID:
<1375360012.85951.YahooMailNeo@xxxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=iso-8859-1
Dear Tanan,
I am sorry when I didn't noticed your email before.
The choice between FM transponder or linear transponder depends on the
purpose of the satellite.
FM transponders can only adress one station at a time (the one with the
biggest uplink power will win), and can only do FM, which is available to
all hams, which makes it even more crowded on this one channel.
On the other hand it is easy to make (one chip solution).
Linear transponders use some more DC power, but can address multiple
stations, in multiple modes (CW, SSB, FM, BPSK, etc), it also leaves room
for new (experimental) modes (as long as it fits in the bandpass).
The disadvantage is the more difficult RF circuitry, which needs quiet some
RF knowlegde and RF experience.
To overcome these disadvantages I put my experiences in the developed of the
small linear transponder LE005-R2.
It can save development time and development cost on (satellite) projects a
lot.
Kind regards,
William Leijenaar
PE1RAH
www.leijenaarelectronics.nl
________________________________
From: Tanan Rangseeprom HS1JAN <hs1jan@xxxxxx.xxx>
To: amsat-bb@xxxxx.xxxx leijenaarelectronics@xxxxx.xxxx PE1RDW
<sats@xxxxxx.xxxxx.xx>; g0mrf@xxx.xxx
Cc: thidad1@xxxxx.xxxx hs5igy@xxxxxxx.xxxx chawalit@xxxxxxx.xx.xxx
hs2jfw@xxxxx.xxx
Sent: Tuesday, July 30, 2013 6:04 PM
Subject: Re: [amsat-bb] V/U Linear Transponder
Dear All
Thanks respond for help to me
1.Thailand has regular to forbid for transmitt UHF band but can receive the
signal for amateur radio satellites only. we need to used VHF band same like
transponder? of Japanes (FO-29) , AmSat AO-51 , Saudiarabia SO-50 and other
satellites. for interference from China Thailand and other countries on VHF
is normal.
2.Ok, I do not have knowledge 100 khz bandwidth is too much for the over
power. please advice me for 30 khz uplink 145.90-145.92 MHz VHF / 435.10 -
435.12 MHz UHF of? liner transponder.
3.We have to design FM repeater use to modify HX1 / RX2A RADIOMETRIX VHF /
UHF transmitter module we have change x-tal to 145.90 MHz / 13.59 MHz and
used MC3361 with x-tal 10.245 MHz and CML IC FX465 CTCSS Encode/Decode build
test it to be successful.
We and technical team of TAMSAT group would like to help and advice for
circuit diagram of V/U transponder same like transponder
of Japanes (FO-29) and other satellites. We had mail to Mr.William
Leijenaar PE1RAH? but do not have respond feedback. Mrs Thida of 100watts
ham radio magazine of thailand sugges me to know Mr.William.because she meet
him on Tokyo ham fair 2009.
On this time we and technical team of TAMSAT group need help very urgent. we
need advice of circuit diagram or datasheet? IC for build V/U Liner
transponder? for payload 1U cubesat of JAISAT satellite project.
best regards
Tanan Rangseeprom HS1JAN
Project Manager of JAISAT-1
member of RAST
email : hs1jan@xxxxxx.xxx
----- Original Message ----- From: <g0mrf@xxx.xxx>
To: <hs1jan@xxxxxx.xxx>
Sent: Monday, July 29, 2013 5:24
PM
Subject: Re: [amsat-bb] V/U Linear Transponder
Dear Tanan.
Thanks for the mail via AMSAT.org
My name is David Bowman? G0MRF and I'm a member of the team building
FUNcube, due for launch this November.
I can help with transponder design, but there are some points which you
need to consider.
1) The use of V band for the uplink will be a poor choice for your
location.? The interference from China and other countries on 145MHz
will mean the transponder will not be usable.? Using U band for the
uplink is a much better choice.
2) The 100kHz bandwidth is too much for the typical power available
from a CubeSat. If you get your RF team to do a link budget analysis,
you will see the cubesat power budget will not support 100kHz of
bandwidth. Ususally 30kHz is as much as you can do with a 1U cube.
3) You may want to
consider a FM 'repeater' as there is now only 1 in
orbit, while there are several linear transponder satellites ready to
be launched.
The FM design will allow you to run a very efficient power amplifier
(70%) and power can be saved over oceans and areas of low population by
using a 67Hz access tone (CML FX465)
I can assist with design but would need to know if you are planning a
1U 2U or 3U design.
William PE???? is good, but will probably just offer to sell you a
transponder.
Regards
David? G0MRF
some old info is available at? www.g0mrf.com/transponder.htm
The attached powerpoint has some pictures of the UV transponder and
other boards in FUNcube from AMSAT-UK
------------------------------
_______________________________________________
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 8, Issue 249
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