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SuitSat, Any Kenwood TH-K2 Experts?

ISS Amateur Radio Status: February 17, 2006


Any Kenwood TH-K2 Experts out there?

By Miles Mann WF1F,

MAREX-MG News   www.marexmg.org
Manned Amateur Radio Experiment

Are there any Kenwood TH-K2 experts out there that
could offer some insight as why the SuitSat
transmitter may be running at 1-10 Milliwatts ERP?

The SutitSat project is supposed to be running at
setting of 500 Milliwatts.  A problem occurred that
caused the power to drop down to the 1 to 10 milliwatt
(ERP) range.  There are few theories, one could be an
antenna feed link problem or it could be a component
failure on the TH-K2.

The component failure theory is supported by the fact
that SuitSat is running longer than expected. 

(Information courtesy of ARISS)
 The original time formula came out to 9 days. 
SuitSat has been running for over 14 days and the
batteries are still over 26.3 volts.
Battery total 45ah  / 0.2 amps = 225 hours or 9.9
days. Adjusted for 50% duty cycle
Assuming 0.079 RX , converter and controller loads
TX load 0.33 amps TX 500 ma.

If the TH-K2 is “Using” less power, then SuitSat will
run longer.
Here is my “Guess”.
The 50% duty cycle of SuitSat may have dropped from
0.2 amps to 0.1 amps.
45ah / 0.1 = 450 hours or 18.75 days.

Suit Sat could still be running February 22, 2006.

What’s your Guess

The questions posted to the TH-K2 Experts:

Is it  possible for a component to fail on the TH-K2
that would result in a TX output of approximately 1 to
10 milliwatts. 

Which components would cause such a problem.

Would the Current draw be reduce with a component
failure and if so, how much less power would be used.

ARISS SuitSat Details

What is Slow Scan TV?
On this web page you will find many links to help you
learn more about
Slow Scan TV

Tips on how to use ISS, SSTV, Packet and Voice

Location of Hardware on ISS
This link will show you images of some of the amateur
radio hardware
already installed on ISS 

Marexmg Web page

73 Miles WF1F MAREX-MG

Until we meet again
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