Re: ISS HamTV Frequencies
The AMSAT-UK page at http://amsat-uk.org/2013/05/12/hamtv-from-the-iss/ provides the links, they are:
Facebook https://www.facebook.com/Hamtvproject
More information at http://www.amsat.it/Amsat-Italia_HamTV_brochure.pdf and http://www.amsat.it/Amsat-Italia_HamTV.pdf
The HamTV.pdf gives the link budget, looks like there's 7dB of coax/connector losses to overcome between the ISS transmitter and the antenna. That document indicates a 90cm dish should be sufficient.
I believe that it's going up on ATV 4 which is currently slated for June 5.
73 Trevor M5AKA
--- On Sun, 12/5/13, R Oler orbitjet@hotmail.com wrote:
From: R Oler orbitjet@hotmail.com Subject: RE: [amsat-bb] ISS HamTV Frequencies To: "M5AKA" m5aka@yahoo.co.uk Date: Sunday, 12 May, 2013, 17:46
Trevor...I have been so busy with our family moving to our new farm and ferrying a bunch of airplanes to Bangladesh and India...that I have not read a lot on this. Do you have a link on the topic?
I am about to get both a VU and SL2 license and will put both active on at least AO7 and VU 52...
thanks in advance. Robert G. Oler WB5MZO
Date: Sun, 12 May 2013 17:01:46 +0100 From: m5aka@yahoo.co.uk To: amsat-bb@amsat.org Subject: [amsat-bb] ISS HamTV Frequencies
The IARU Amateur Satellite Frequency Coordination Panel have announced frequencies of 2422.0 MHz and 2437.0 MHz.
See http://amsat-uk.org/2013/05/12/hamtv-from-the-iss/
73 Trevor M5AKA AMSAT-UK website http://amsat-uk.org/ Facebook https://www.facebook.com/pages/AMSAT-UK/208113275898396
Twitter https://twitter.com/AMSAT_UK
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
HamTV - Houston Power Point slides http://www.amsat.org/amsat/ariss/Meetings/2011_Houston/Presentations/11%20Pr...
Some addition information plus a video of a presentation given by AMSAT-Italia (video in Italian) is on the ESA website at http://www.esa.int/About_Us/ESRIN/Radio_hams_at_ESRIN_with_AMSAT_Italia/%28p...
I understand the HamTV equipment will be carried to the ISS on the ATV 4 spacecraft currently planned to launch on June 5.
BTW Italy also has an Astronaut Luca Parmitano KF5KDP heading to the ISS. Luca is planned to launch from Baikonur in Kazhakstan to the ISS on May 28 and is also mentioned in his post - USA High School Student’s RocketHub Project http://amsat-uk.org/2013/05/11/high-school-students-rockethub-project/
73 Trevor M5AKA
--- On Sun, 12/5/13, M5AKA m5aka@yahoo.co.uk wrote:
The AMSAT-UK page at http://amsat-uk.org/2013/05/12/hamtv-from-the-iss/ provides the links, they are:
Facebook https://www.facebook.com/Hamtvproject
More information at http://www.amsat.it/Amsat-Italia_HamTV_brochure.pdf and http://www.amsat.it/Amsat-Italia_HamTV.pdf
The HamTV.pdf gives the link budget, looks like there's 7dB of coax/connector losses to overcome between the ISS transmitter and the antenna. That document indicates a 90cm dish should be sufficient.
I believe that it's going up on ATV 4 which is currently slated for June 5.
73 Trevor M5AKA
Anybody off the top of their heads know how many degrees a second swing are (is?) required for direct aim at the ISS? I know there are beam width tolerances, altitude variations and degree above horizon variations but I'm looking at Bob B's fixed antenna aiming of 15-20 degrees above horizon to evaluate swinging a dish without torque eating up the drive train...
Roger WA1KAT On 5/12/2013 5:01 PM, M5AKA wrote:
The AMSAT-UK page at http://amsat-uk.org/2013/05/12/hamtv-from-the-iss/ provides the links, they are:
Facebook https://www.facebook.com/Hamtvproject
More information at http://www.amsat.it/Amsat-Italia_HamTV_brochure.pdf and http://www.amsat.it/Amsat-Italia_HamTV.pdf
The HamTV.pdf gives the link budget, looks like there's 7dB of coax/connector losses to overcome between the ISS transmitter and the antenna. That document indicates a 90cm dish should be sufficient.
I believe that it's going up on ATV 4 which is currently slated for June 5.
73 Trevor M5AKA
A dish like in the picture probably has a beam-width of 15-ish degrees. I used a 30 inch BBQ grill antenna for AO-40, and would notice a drop-off when mis-aimed by about that much. ISS moves VERY quickly compared to AO-40, so some sort of active positioning on both axis is going to be required.
I need to get that dish back up on the rotisserie...
Greg KO6TH
Roger wrote:
Anybody off the top of their heads know how many degrees a second swing are (is?) required for direct aim at the ISS? I know there are beam width tolerances, altitude variations and degree above horizon variations but I'm looking at Bob B's fixed antenna aiming of 15-20 degrees above horizon to evaluate swinging a dish without torque eating up the drive train...
Roger WA1KAT On 5/12/2013 5:01 PM, M5AKA wrote:
The AMSAT-UK page at http://amsat-uk.org/2013/05/12/hamtv-from-the-iss/ provides the links, they are:
Facebook https://www.facebook.com/Hamtvproject
More information at http://www.amsat.it/Amsat-Italia_HamTV_brochure.pdf and http://www.amsat.it/Amsat-Italia_HamTV.pdf
The HamTV.pdf gives the link budget, looks like there's 7dB of coax/connector losses to overcome between the ISS transmitter and the antenna. That document indicates a 90cm dish should be sufficient.
I believe that it's going up on ATV 4 which is currently slated for June 5.
73 Trevor M5AKA
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
Roger, A SWAG, (Wild Guess) 1 degree per second at a Zenith of 90 degrees. Anything less than 90 degrees will be slower with several minutes spent near the horizon. You can use an orbital program to get exact numbers. With a wide beam width antenna, the lag overhead may never require the antenna to move with the object, as there will be time for the antenna system to catch up after passing overhead. Art, KC6UQH
-----Original Message----- From: amsat-bb-bounces@amsat.org [mailto:amsat-bb-bounces@amsat.org] On Behalf Of Roger Sent: Sunday, May 12, 2013 2:34 PM To: amsat-bb@amsat.org Subject: [amsat-bb] Re: ISS HamTV Frequencies
Anybody off the top of their heads know how many degrees a second swing are (is?) required for direct aim at the ISS? I know there are beam width tolerances, altitude variations and degree above horizon variations but I'm looking at Bob B's fixed antenna aiming of 15-20 degrees above horizon to evaluate swinging a dish without torque eating up the drive train...
Roger WA1KAT On 5/12/2013 5:01 PM, M5AKA wrote:
The AMSAT-UK page at http://amsat-uk.org/2013/05/12/hamtv-from-the-iss/
provides the links, they are:
Facebook https://www.facebook.com/Hamtvproject
More information at http://www.amsat.it/Amsat-Italia_HamTV_brochure.pdf and http://www.amsat.it/Amsat-Italia_HamTV.pdf
The HamTV.pdf gives the link budget, looks like there's 7dB of
coax/connector losses to overcome between the ISS transmitter and the antenna. That document indicates a 90cm dish should be sufficient.
I believe that it's going up on ATV 4 which is currently slated for June
5.
73 Trevor M5AKA
_______________________________________________ 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
participants (4)
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Art McBride -
Greg D -
M5AKA -
Roger