[amsat-bb] Re: ISS power output ? MM

[Charlie Schlieper]

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" <ka1rrw at yahoo.com>
To: "Zachary Schrempp" <zach.km7i at gmail.com>; <vk4tec at people.net.au>
Cc: "Amsat-Bb at Amsat. Org" <amsat-bb at amsat.org>
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 <zach.km7i at gmail.com> wrote:
>
>> I have heard in the past that it is 10 W.
>>
>> Zach Schrempp
>> KM7I
>>
>> On Dec 29, 2007 7:08 AM, Andrew Rich
>> <vk4tec at people.net.au> 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
>> > vk4tec at people.net.au
>> > http://www.tech-software.net
>> >
>> >
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