Hi to All in 2008,
Miles, in saying:
In Space there is NO Convection Cooling, so all electronics run hotter. The primary cooling for the D700 is from the fan mounted to the back of the heat sink.
You are absotulely correct, in a sense, but somewhat in error. The first part is very true-- in the sense of a space environment; however, following it up with the part about FAN cooling sort of gives it away, doesn't it?
To the best of my knowledge, the the RADIO aboard the ISS is located in a life-support (air) environment, and NOT in a vacuum of space.
A sincere THANKS for all you do to support AMSAT and our SATELLITE world! Have a nice 2008.
73, Charlie, N5TD
----- Original Message ----- From: "MM" [email protected] To: "Zachary Schrempp" [email protected]; [email protected] Cc: "Amsat-Bb@Amsat. Org" [email protected] Sent: Wednesday, January 02, 2008 9:31 AM Subject: [amsat-bb] Re: ISS power output ? MM
The Kenwood D700 on ISS has been specially modified not to exceed 25 watts. The stock terrestrial version will run 45-50 watts.
The default software setting on the ISS D700 is set for 10 watts. Every time the crew powers on the radio or hits a PM Key, the power is reset to 10 watts. This setting is for all modes, Packet, Voice, etc. Power levels available to the crew are 5, 10 and 25 watts.
There are tentative plans to reprogram the D700 on ISS and turn down the power to 5 watts. The reason for the change is two fold, the 5 watt signal is good enough for most terrestrial stations running a 0 dBd antenna and the lower letting will keep the radio cooler. In Space there is NO Convection Cooling, so all electronics run hotter. The primary cooling for the D700 is from the fan mounted to the back of the heat sink.
www.marexmg.org
Miles
--- Zachary Schrempp [email protected] wrote:
I have heard in the past that it is 10 W.
Zach Schrempp KM7I
On Dec 29, 2007 7:08 AM, Andrew Rich [email protected] wrote:
Does anyone know what power the ISS is running on
145.825 ?
I see it is a D700, perhaps on 5 watts ?
Andrew Rich VK4TEC [email protected] http://www.tech-software.net
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