Subject: Was, Is there anyway to get a linear transponder on the ISS?
Thanks for all the input regarding the FM 'repeater' on the ISS. Further research into the issues has enlightened me on the machinations of getting things done on the ISS and the complicated processes of working with such varied national interests. It is obviously way above my pay grade and with these comments I sadly end the quest with a feeling of not going anywhere.
The Kenwood TM-D700 portion of the Phase 2 Hardware system is apparently overheating. Possibly because of a lack of airflow over the heat sinks. Possibly because when it is made available, the duty cycle rises to near 100% and the unit consumes too much power from the ISS power budget. Since the other parts of the Phase 2 system are fulfilling the needs of the ISS and NASA agenda, there are no resources available to correct the problems with the TM-D700. Indeed, replacing it with a linear transponder of equal bandwidth and much reduced power consumption may be a much better solution but there do not appear to be any benefits to the ARISS program to drive the solution. There was a mention in the paper produced circa 2002-3 of a third phase of the ARISS hardware system to be mounted outside but no mention of such a program since then has been located.
Should others want to pursue a program of getting a linear transponder mounted on the outside of the ISS, I wish you luck and refer you to the document; "Amateur Radio on the International Space Station - Phase 2 Hardware System" by Frank H. Bauer, KA3HDO, Lou McFadin, W5DID, Bob Bruniga, WB4APR, and Hiroto Watarikawa. Sergej Samburov, RV3DR was also listed but this call sign now returns as belonging to Energia in Russia. The document was found at http://www.ariss-eu.org/phase_2_document.pdf on the internet. Frank is a new Amsat VP in this area, Bob is a participant in this list and Lou is still around too I think. Maybe one or all of them can help.
73,
Tom K5VOU
Notwithstanding the difficulties and complexities of getting something up to and installed on the ISS, why would we want to put an obsolete radio up there anyway?
Seems to me that a TM-D710 would be a much better replacement for the D700. For one thing, it has a built in cooling fan which should take care of the cooling concerns. It's obviously not a linear transponder, but then most hams don't have the equipment to use one anyway while most of us have VHF and UHF FM equipment.
Coupled with a laptop, it could be used for WL2K comms, APRS and straight up packet in addition to plain old voice comms.
Jeff Moore -- KE7ACY
On 6/2/2013 6:23 PM, K5VOU wrote:
Thanks for all the input regarding the FM 'repeater' on the ISS. Further research into the issues has enlightened me on the machinations of getting things done on the ISS and the complicated processes of working with such varied national interests. It is obviously way above my pay grade and with these comments I sadly end the quest with a feeling of not going anywhere.
The Kenwood TM-D700 portion of the Phase 2 Hardware system is apparently overheating. Possibly because of a lack of airflow over the heat sinks. Possibly because when it is made available, the duty cycle rises to near 100% and the unit consumes too much power from the ISS power budget. Since the other parts of the Phase 2 system are fulfilling the needs of the ISS and NASA agenda, there are no resources available to correct the problems with the TM-D700. Indeed, replacing it with a linear transponder of equal bandwidth and much reduced power consumption may be a much better solution but there do not appear to be any benefits to the ARISS program to drive the solution. There was a mention in the paper produced circa 2002-3 of a third phase of the ARISS hardware system to be mounted outside but no mention of such a program since then has been located.
Should others want to pursue a program of getting a linear transponder mounted on the outside of the ISS, I wish you luck and refer you to the document; "Amateur Radio on the International Space Station - Phase 2 Hardware System" by Frank H. Bauer, KA3HDO, Lou McFadin, W5DID, Bob Bruniga, WB4APR, and Hiroto Watarikawa. Sergej Samburov, RV3DR was also listed but this call sign now returns as belonging to Energia in Russia. The document was found at http://www.ariss-eu.org/phase_2_document.pdf on the internet. Frank is a new Amsat VP in this area, Bob is a participant in this list and Lou is still around too I think. Maybe one or all of them can help.
73,
Tom K5VOU
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 Mon, 3/6/13, K5VOU k5vou2@verizon.net wrote:
Possibly because when it is made available, the duty cycle rises to near 100% and the unit consumes too much power from the ISS power budget.
Hi, I'm baffled as to why you mention the ISS power budget. Do you have any references, ARISS or elsewhere, to confirm that the ISS power budget has ever been raised as an issue ? The one thing the ISS appears to have in abundance is Solar Power.
The equipment to be installed on the ISS for the HAM-TV project will consume far more power than the Kenwood TM-D700 ever did.
The KuPS power supply that was built to power the HAM-TV transmitter was designed to supply power to up to three separate payloads.
73 Trevor M5AKA
The ARISS minutes for August 21, 2012 record that a new Kenwood TM-D710 has been upmassed to the ISS for use with Russian SSTV experiments, see
http://ariss.rac.ca/arisstel2012-08-21.htm
73 Trevor M5AKA
--- On Mon, 3/6/13, M5AKA m5aka@yahoo.co.uk wrote:
To: AMSAT-BB@amsat.org, K5VOU@amsat.org Date: Monday, 3 June, 2013, 12:00 --- On Mon, 3/6/13, K5VOU k5vou2@verizon.net wrote:
Possibly because when it is made available, the duty cycle rises to near 100% and the unit consumes too much power from the ISS power budget.
Hi, I'm baffled as to why you mention the ISS power budget. Do you have any references, ARISS or elsewhere, to confirm that the ISS power budget has ever been raised as an issue ? The one thing the ISS appears to have in abundance is Solar Power.
The equipment to be installed on the ISS for the HAM-TV project will consume far more power than the Kenwood TM-D700 ever did.
The KuPS power supply that was built to power the HAM-TV transmitter was designed to supply power to up to three separate payloads.
73 Trevor M5AKA
El 03/06/13 07:00, M5AKA escribió:
--- On Mon, 3/6/13, K5VOUk5vou2@verizon.net wrote:
Possibly because when it is made available, the duty cycle rises to near 100% and the unit consumes too much power from the ISS power budget.
Hi, I'm baffled as to why you mention the ISS power budget. Do you have any references, ARISS or elsewhere, to confirm that the ISS power budget has ever been raised as an issue ? The one thing the ISS appears to have in abundance is Solar Power.
The equipment to be installed on the ISS for the HAM-TV project will consume far more power than the Kenwood TM-D700 ever did.
The KuPS power supply that was built to power the HAM-TV transmitter was designed to supply power to up to three separate payloads.
73 Trevor M5AKA
The issue of the Kenwood radio being "power hungry" in this thread is my fault...
I remember to read a info related to this in some place time ago, but now I can't point you to a reliable source, maybe I'm remembering a comment in a forum post elsewhere and this (wrong) idea stick to my mind...
Sorry to all about that.
73 de CO7WT
Keep in mind that there are many great folks working behind the scenes on their own time to make things work. ARISS members and the ARISS board are a great example of dedicated folks working on our behalf. Things happen in due time. You can always contact your ARISS rep for your region and get updates.
73, Stefan, VE4NSA
On Tue, Jun 4, 2013 at 6:58 PM, Ing. Pavel Milanes Costa <co7wt@frcuba.co.cu
wrote:
El 03/06/13 07:00, M5AKA escribió:
--- On Mon, 3/6/13, K5VOUk5vou2@verizon.net wrote:
Possibly because when it is made available, the duty cycle rises to near 100% and the unit consumes too much power from the ISS power budget.
Hi, I'm baffled as to why you mention the ISS power budget. Do you have any references, ARISS or elsewhere, to confirm that the ISS power budget has ever been raised as an issue ? The one thing the ISS appears to have in abundance is Solar Power.
The equipment to be installed on the ISS for the HAM-TV project will consume far more power than the Kenwood TM-D700 ever did.
The KuPS power supply that was built to power the HAM-TV transmitter was designed to supply power to up to three separate payloads.
73 Trevor M5AKA
The issue of the Kenwood radio being "power hungry" in this thread is my fault...
I remember to read a info related to this in some place time ago, but now I can't point you to a reliable source, maybe I'm remembering a comment in a forum post elsewhere and this (wrong) idea stick to my mind...
Sorry to all about that.
73 de CO7WT
______________________________**_________________ 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-bbhttp://amsat.org/mailman/listinfo/amsat-bb
participants (5)
-
Ing. Pavel Milanes Costa -
Jeff Moore -
K5VOU -
M5AKA -
Stefan Wagener