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@people.net.au http://www.tech-software.net
I have heard in the past that it is 10 W.
Zach Schrempp KM7I
On Dec 29, 2007 7:08 AM, Andrew Rich vk4tec@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@people.net.au http://www.tech-software.net
Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
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@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@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@people.net.au http://www.tech-software.net
Sent via AMSAT-BB@amsat.org. Opinions expressed
are those of the author.
Not an AMSAT-NA member? Join now to support the
amateur satellite program!
Subscription settings:
http://amsat.org/mailman/listinfo/amsat-bb
Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
____________________________________________________________________________________ Looking for last minute shopping deals? Find them fast with Yahoo! Search. http://tools.search.yahoo.com/newsearch/category.php?category=shopping
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@yahoo.com To: "Zachary Schrempp" zach.km7i@gmail.com; vk4tec@people.net.au Cc: "Amsat-Bb@Amsat. Org" amsat-bb@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@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@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@people.net.au http://www.tech-software.net
Sent via AMSAT-BB@amsat.org. Opinions expressed
are those of the author.
Not an AMSAT-NA member? Join now to support the
amateur satellite program!
Subscription settings:
http://amsat.org/mailman/listinfo/amsat-bb
Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
Looking for last minute shopping deals? Find them fast with Yahoo! Search. http://tools.search.yahoo.com/newsearch/category.php?category=shopping _______________________________________________ Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
On Jan 2, 2008, at 11:14 AM, Charlie Schlieper wrote:
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.
Don't forget, for *convective* cooling, you need gravity. There is no consistent gravity vector aboard the ISS that will cause cold air to fall, and warm air to rise, sufficient for convective cooling.
Rick Mann wrote:
On Jan 2, 2008, at 11:14 AM, Charlie Schlieper wrote:
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.
Don't forget, for *convective* cooling, you need gravity. There is no consistent gravity vector aboard the ISS that will cause cold air to fall, and warm air to rise, sufficient for convective cooling.
There is a distinction between free convection and forced convection. Free convection requires gravity and doesnt work in microgravity while forced convection with a fan does. Both are types of convective heat transfer.
Jim KB3KJ
On Jan 2, 2008, at 12:01 PM, James C. Mankin wrote:
There is a distinction between free convection and forced convection. Free convection requires gravity and doesnt work in microgravity while forced convection with a fan does. Both are types of convective heat transfer.
Fair 'nough. I tend to think of the unqualified "convection" as free convection, but you're right. In any case, I would think that (on this radio) the forced convection for the fan greatly eclipses the free convection one would get in a uniform gravity field, making cooling requirements a bit of a non-issue in this case.
participants (6)
-
Andrew Rich -
Charlie Schlieper -
James C. Mankin -
MM -
Rick Mann -
Zachary Schrempp