[amsat-bb] Re: Subject: Was, Is there anyway to get a linear transponder on the ISS?

[Stefan Wagener]

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  wrote:

> El 03/06/13 07:00, M5AKA escribió:
>
>  --- On Mon, 3/6/13, K5VOU  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
>
> __**_
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[amsat-bb] Re: Subject: Was, Is there anyway to get a linear transponder on the ISS?

[Ing. Pavel Milanes Costa]

El 03/06/13 07:00, M5AKA escribió:

--- On Mon, 3/6/13, K5VOU  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
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[amsat-bb] Re: Subject: Was, Is there anyway to get a linear transponder on the ISS?

[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  wrote:
> To: AMSAT-BB@amsat.org, k5...@amsat.org
> Date: Monday, 3 June, 2013, 12:00
> --- On Mon, 3/6/13, K5VOU 
> 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
> 
> 

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[amsat-bb] Re: Subject: Was, Is there anyway to get a linear transponder on the ISS?

[M5AKA]

--- On Mon, 3/6/13, K5VOU  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


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[amsat-bb] Re: Subject: Was, Is there anyway to get a linear transponder on the ISS?

[Jeff Moore]

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


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