All posts by Tom

Another ISS SSTV event this weekend

Another series of SSTV transmissions from the International Space Station is under way, running throughout this weekend.

Listen out on 145.800 FM. A handheld up to a smartphone’s mic will yield fairly good results.

Passes below – though it’s not expected to be on for every orbit, just select orbits that favour Moscow.

Amateur Radio ISS contact next week at Gilwell Park

A contact between the International Space Station and youngsters at Gilwell Park, north London, is scheduled for Tuesday 8 August (next week), as part of Youngsters on the Air 2017.

The youngsters will take part in a Q&A session with astronaut Paolo Nespoli, IZØJPA, Flight Engineer of Expedition 52/53, lasting around 10 minutes.

The contact will be at 1838 UTC (that’s 1938 local time) on 2m FM, likely on the standard ARISS frequency of 145.800 MHz, and should be readily receivable using handheld Yagis, turnstiles, or even rubber duck antennas over the UK and northern Europe.

A simultaneous HamTV transmission is also planned, with live pictures from ISS coming down via DVB-S, streamed live via the BATC website.

Some more information provided by Southgate ARC here.

Many thanks to the ARISS team for once again coming together to make this event happen – we look forward to seeing the results.

ISS SSTV 2m FM transmissions this weekend

This weekend, ARISS is celebrating its 20th anniversary with a series of SSTV transmissions from the ISS – International Space Station.

Transmissions will be on 145.800 FM in PD 120 or PD180.

These should be easily receivable on a handheld tuned to 145.800 with anything better than the stock whip. Last time around they were loud! A 3 element tape measure yagi will work very well for this, and it’s not much effort to knock one together. Full quieting signal should be achievable.
Images can be decoded live during the passes on a smartphone using, for example, “SSTV Slow Scan TV” by Black Cat Systems for iPhone, or “Robot36 – SSTV Image Decoder” on Google Play for Android. A cable will help, but holding the mic up to the HT speaker should work okay. Alternatively recording the audio through whatever means will allow you to play around decoding later.
Passes for the weekend can be found on http://www.heavens-above.com as well as other sources. Be sure to set your location. Some key passes:

Thu 23:23:21
Fri 00:58:35
Fri 22:32:15
Sat 00:06:25
Sat 23:14:23
Sun 00:50:21
Sun 22:22:34
Sun 23:58:03
Mon 01:34:30

Event is scheduled to end at 18:00 UTC on Monday 24 July.

Most of the passes this weekend are visible, so assuming no cloud, antenna pointing shouldn’t be a problem 🙂
 
Most favourable pass taking into account the time looks like Sat 23:14:23 BST.
 
For those of you who have not spotted ISS in the night sky as yet, at its peak it is second only in brightness to the moon in the night sky, appearing as a solid bright white point typically low in the south-western sky from the UK, appearing to move across the sky about the same speed as an airplane at altitude. At its highest point, on a high pass, it really is hard to miss – easily brighter than Venus or Jupiter. Some passes it will fade into shadow, some it will pass across the whole sky brightly reflecting full sunlight, well into the late night down here.
 
If the same format is followed this time around as last, there will be 2.5 ish images per pass with a few tens of seconds gap in between, with no carrier.
 
Happy sat spotting…
Update
In the end I slept through most of the passes! However here’s the one image I did capture:
I put together a simple cable to connect my Wouxun handy to my iPhone based on this circuit,  used an inexpensive Nagoya NA-771 whip, and for aiming, I listened for ISS on a second handy on its stock antenna, held closely and parallel to the Wouxun, broadside to ISS. Almost perfect copy, up to at least S6 or so. Great fun!
Did you capture anything? Tell us @MX0AAA!