[amsat-bb] Re: [Mw] Satellite to carry Amateur Radio 5840.00 MHz telemetry beacon

Stan stan at capecod.com
Wed Jan 27 07:25:42 PST 2010


This satellite holds some promise of a decent and doable microwave 
technical challenge.

It will be possible to use our 5760 Transverters for a RX only 
application, maybe with minor tweaking.

The LO is 5616 MHz, with the RF of 5840 MHz, the IF is 224 MHz, right in 
the US 222 MHz band.

Maybe with a bigger dish, and a very low noise figure preamplifier, 
optimized at 5840 MHz,
we could be in the UNITEC-1 deep space telemetry collection business.

The DEMI A32 LO  with an external 10 MHz reference, can add the 
frequency stability needed.
Or maybe Steve, N5AC, can preprogramm the A32 for a 5,840-145= 5,695 / 5 
= 1,139.0 MHz

A reasonable challenge this winter morning, as I sip my lukewarm tea at 
the dining room table.

But more questions are raised:

1. Keplerian elements are great for satellites, but once UNITEC1 enters 
deep space,
what do we use to calculate and predict the path for our accurate tracking ?

2. Is there anything special about the modulation scheme ?

Stan, W1LE     Cape Cod    FN41sr






Trevor . wrote:
> On May 20 Japan is planning to launch four "CubeSats". The largest of them, UNITEC-1, will carry a 15 watt Amateur Radio 5840.00 MHz telemetry beacon and travel into deep space towards Venus 
>
> Three of the satellites will carry Amateur Radio payloads. On the AMSAT bulletin board Mineo Wakita JE9PEL writes  
>
> Four CubeSats in Japan are planned to launch at 20 May 2010
> together with PLANET-C which belongs to JAXA by H-IIA rocket.
>   http://www.jaxa.jp/index_e.html
>
> UNITEC-1, NPO UNISEC (University Space Engineering Consortium)
>   5.8GHz
>   http://www.unisec.jp/unitec-1/en/top.html
>
> Negai*", Soka University
>   437.305MHz CW, Packet 1200bps FSK AX.25
>   http://kuro.t.soka.ac.jp/main.html
>
> WASEDA-SAT2, Waseda University
>   437.485 MHz CW(FM), PCM-FSK(FM) 9600bps
>   http://www.miyashita.mmech.waseda.ac.jp/Waseda-Sat2/index.htm
>
> KSAT, Kagoshima University
>   Uplink: S-band(2GHz, 10kbps), Downlink: Ku-band(13.275GHz, 10kbps/1Mbps)
>   http://www.sci.kagoshima-u.ac.jp/~nishio/download/Ukaren2008Nishio.pdf
>
> IARU Amateur Satellite Frequency Coordination information 
> Unitec-1 http://www.amsat.org.uk/iaru/finished_detail.asp?serial=141 
> Negai http://www.amsat.org.uk/iaru/finished_detail.asp?serial=90 
> WASEDA-SAT2 http://www.amsat.org.uk/iaru/finished_detail.asp?serial=123 
>
> AMSAT Bulletin Board AMSAT-BB
> http://www.amsat.org/amsat-new/tools/maillist/
>
> AMSAT-UK publish a colour A4 newsletter, OSCAR News, that is full of Amateur Satellite information.
> Join online at https://secure.amsat.org.uk/subs_form/ 
> ----
> 73 Trevor M5AKA
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