A close up of Doppler Shift

My searches about Soppler Effect on Doppler scenarios for low Earth orbiting satellite operation reaches here..

Many amateurs have been confused by the Doppler shift encountered during satellite operation. In essence, Doppler shift is simply the apparent change in frequency that is observed when an object moves towards or away from an observer. It is a property common to wave propagation. Almost everyone has experienced Doppler shift in everyday life. Here's a couple of common examples:

Read on : http://www.qsl.net/vk3jed/doppler.html

China's 1st ever amateur radio satelite XW-1 is in space now!

ANS Special Bulletin AMSAT China Says XW-1 Has Been Launched.

AMSAT China reports it was launched at about around 0230 UTC on December 15, 2009. The beacon was received in Sanya after launch.XW-1 was a secondary payload aboard the CZ-4C rocket from Taiyuan Satellite Launch Center into a sun-synchronous orbit about 1200kilometers high. The primary payload of this launch is the Yaogen-8Remote Sensing Satellite.

The preliminary keplerian elements for the satellite are:

XW-1

1 99999U 09349.11987269 .00000000 00000-0 00000-0 0 00006

2 99999 100.4859 046.2958 0001760 147.4703 038.6343 13.15267150000017

The XW-1 communications payload includes a beacon and three crossband transponders operating in FM, linear, and digital modes.

Here is a Spacecraft Summary:

Common Name: XW-1

Alternate Name: CAS-1

Satellite Type: Microsatellite

Launch Date: TBD

Launch Location: Taiyuan Satellite Launch Center of China

Launch Vehicle: CZ-2C(LM-2C) Rocket

Apogee: 1200km

Perigee: 1200km

Inclination: 105 degrees

Period: 109 minutes

Local time of descending node: 21:30

Weight: 50kg

Frequency Information:

Mode V/U (J) FM Voice Repeater (30 dbm (1 w)):

Uplink: 145.8250 MHz FM, PL 67.0 Hz.

Downlink: 435.6750 MHz FM

Mode V/U (J) Linear Transponder (Inverting) (30 dbm (1 w)):

Uplink:145.9250 - 145.9750 MHz SSB/CW

Downlink:435. 7650 - 435.7150 MHz SSB/CW

Mode V/U (J) PacSat BBS (30 dbm (1 w)):

Uplink:145.8250 MHz AFSK 1200 BPS

Downlink: 435.6750 MHz AFSK 1200 BPS

Mode Beacon (23 dbm (200mw)):

Downlink:435. 7900 MHz CW

You can get XW-1 Telemetry Format at :

http://www.amsat. org/amsat- new/satellites/ documents/ XW-1_Telemetry_ Format.pdf

Details of the XW-1 satellite are available at:

http://www.camsat. cn/index. php?option= com_content& view=article& id=56&Itemid= 67

[ANS thanks David Chen, BD5RV/4 and Alan Kung, BA1DU for the above information]

Courtsy : Mani, VU2WMY