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[aprssig] Is ISS Digipeater Down?

Greg D ko6th.greg at gmail.com
Sun Jun 17 05:55:44 UTC 2012


Apparently.  But that was the part I wanted to ask more questions about, 
and didn't get a chance to.  I thought it might be the original Ericsson 
rig, but don't know what it has for a TNC.  And, is it using that new 
antenna that we sent up there a while ago?   There are reports 
definitely show it being in Packet mode, so whatever it is, it's working.

Greg  KO6TH


Steve Noskowicz wrote:
>
> So, therefore, they have another radio on board to do UHF APRS on 437.55 ??
> 73, Steve, K9DCI
>
>
>> I asked about it last week during the
>> AMSAT Net (14.282 18:00z Sundays),
>> and got essentially the same answer. HF conditions were
>> really marginal
>> at the time, so I didn't get a chance to go into details.
>>
>> Also looking back at last week's AMSAT News bulletin,
>> there's the
>> following report:
>>
>> Status of ISS Ham Radio Operations
>>
>> ISS Amateur Radio Project Engineer Kenneth Ransom, N5VHO
>> reports the
>> ARISS digipeater has changed frequency from 145.825 MHz
>> (up/down) to
>> 437.550 MHz (up/down). The same digi alias ARISS is still
>> used.
>>
>> This change was started with the docking of the ESA
>> Automated Trans-
>> fer Vehicle (ATV). The ATV is an expendable, unmanned
>> resupply space-
>> craft delivering propellant, water, air, payloads and
>> experimental
>> supplies to the International Space Station (ISS).
>>
>> Packet operations were moved to the Columbus Module UHF
>> radio when
>> the Kenwood D700 radio was recently powered off due to
>> needing an
>> additional air purifier to support the ATV. Normally the air
>> puri-
>> fier is located in the ATV but recent power support issues
>> related
>> to the ATV and ISS necessitated the system be relocated to
>> the Ser-
>> vice Module. The purifier is now using the power outlet that
>> the
>> Kenwood radio normally uses. The Russian team has agreed to
>> briefly
>> power the purifier off for the scheduled ARISS school events
>> but then
>> will re-activate the purifier right afterwards. This appears
>> to be a
>> long term impact as ATV is currently scheduled to depart
>> from ISS in
>> September.
>>
>> [ANS thanks Kenneth Ransom, N5VHO for the above
>> information]
>>
>>
>> I haven't tried it myself, but that's what I know,
>>
>> Greg KO6TH
>>
>>
>> Gregg Wonderly wrote:
>>> The way I read it, is that they needed power for
>> something that was not there before, the air purifier. 
>> If I understand correctly, they are doing this because of
>> the extra vehicle currently attached to the station.  I
>> suspect there are only so many power outlets available at
>> various places in the station, and due to the placement of
>> the purifier, the D700 outlet was the power outlet was
>> chosen to be used, so it is therefore powered off, for now.
>>> Gregg Wonderly
>>>
>>> On Jun 16, 2012, at 10:38 PM, Steve Noskowicz wrote:
>>>
>>>>>> It has moved to 437.550 MHz. Apparently
>> they needed the
>>>>>> power outlet that normally powered a D700
>> for something as
>>>>> trivial as running an air purifier for a while.
>> 8)
>>>>>> www.uk.amsat.org/8136
>>>>>>
>>>>> Interesting...  Apparently then, they have
>> an external
>>>>> TNC up there, along with the one inside the
>> D700.
>>>> I don't understand this.  They're using
>> something other than the D700 that draws less current, or
>> uses another power outlet?
>>>> Could the D700 be moded for European freq range
>> (UHF 430-440)
>>>> 73, Sterve, K9DCI
>>>>
>>>>
>>>>
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