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[aprssig] Is ISS Digipeater Down?

Steve Noskowicz noskosteve at yahoo.com
Sun Jun 17 04:23:44 UTC 2012



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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