ISS not heard past 3 days 3/4/2017

Anyone know why the UHF digitpeater has not been active on the ISS? The reboost has been done and I think the supply vessels are not an issue right now so.... any one know?

W8LR – Sat, 2017 – 03 – 04 17:16

Re: ISS digi not heard

Could it be that the crew are using the supporting power supply for experiments as they are posting several on twitter over past days.?
'All radios will be turned off on Feb. 22 while the supporting power supply is being used for an experiment' shown on ariss.org site.
ISS digi was still active on this date and following days. Could it be the late arrival of Dragon delayed that experiment.?

Not sure it would take days to swap out Ericsson handheld vhf and uhf radios being like-for-like once crew find the time.

Submitted by G7HCE on Sun, 2017-03-05 05:12.

Re: ISS not heard past 3 days 3/4/2017

We know that they have to swap from UHF to VHF with the new Ericsson transceiver. Perhaps they are doing this.

Raf IZ0QWM
SysOp of IR0UGN

Submitted by iz0qwm on Sun, 2017-03-05 04:50.

I was wondering if they are

I was wondering if they are in the process of installing the new VHF rig but I do not know why that would effect the UHF rig. I thought they were in different modules and the UHF digipeater could keep operating while the VHF radio was installed. Hope it is back on soon.

Jerry
W8LR

Submitted by W8LR on Sun, 2017-03-05 09:04.

Re:I was wondering if they are

Hi Jerry,

Ericsson VHF handheld radio used for ARISS school contacts and packet digipeater failed and was swapped out with the identical Ericsson UHF radio which was already stowed on the ISS currently used on 437.550Mhz packet digipeater. This radio is located in the Columbus module along with the HamTv video transmitter and both used together for the ARISS school contacts when supported by HamTv video on 437.525Mhz.
Kenwood D710E radio supporting SSTV and VHF ARISS school contacts is located in the Russian segment and is currently being used when not supported by HamTv video on 145.800Mhz.
Once the VHF radio is swapped out with the UHF radio things will return to normal again. ARISS team are looking to replace these radios near end of year with Kenwood TM-D710GA.

Submitted by G7HCE on Sun, 2017-03-05 09:59.

Thanks for the info. What I

Thanks for the info. What I have been reading about VHF, (I'm new to working the ISS), is that on VHF there were so many unattended stations that it was very difficult to even make a contact with a live operator. I hope that this does not reoccur on VHF when it is back up an operational.

Again, Thanks for the info

Jerry W8LR

Submitted by W8LR on Sun, 2017-03-05 12:50.
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