HRPT - first images! - and my setup
I got into HRPT some time ago and was able to receive some nice images so far. My setup is not optimal at all, but it works quite well already. I post most of my HRPT images and other sat related stuff on my Twitter profile, follow me if you are interested :)
If you have questions, just send me an Email or contact me on Twitter etc.
First of all here is my Video about it, additional information and a few images follow further down this page.
I found a good and quite cheap low loss cable that works really well, even on those high frequencies named CFD200 / LMR200. You can source it from Amazon Germany, as I also did, or search on ebay etc. But i would still recommend to use as short of a cable as possible.
Try to point the Antenna as accurate as possible, that is very important and will decide if you can decode the signal or not! This is not as hard as it sounds on low elevation passes (under 50°), but it can get quite tricky on higher passes. It is also very important to have no obstructions between the Dish and the Satellite. Even a small tree can almost kill your signal, a (Brick wall) house will definitely do that.
You can use a stationary satellite (any type of inmarsat is quite good around the world), like Alphasat here in europe on 25°W, to test and optimize your setup.
For predicting the Satellite passes you can use WXTrack or Orbitron on a pc. I also like to use the app ISS-Detector for any sorts of satellite prediction these days.
Pro Tipp: Don't DROP your Feed...it will break ;) (yeah that happend to me...)
- 1.2m (before 80cm) offset Dish with my 3D printed Feed (7 windings) ->
- SMA male to male adapter ->
- 2x SPF5189Z LNAs (cheap from china) connected by a SMA m. to m. adapter ->
- SMA m. to m. adapter -> Airspy Mini ->
- 3m long USB extension cable -> Notebook
The Two LNAs are powered by USB cable that is then extended by another 3m usb cable to my Notebook.
My Feed has 7 turns that are 20mm spaced, the fisrt 1/4 is paralel to the Groundplane as a match.
You can find information about not 3D printable feeds on the following websites:
- uhf-satcom.com(easy 3 turn helical feed, same as my v1 §D printable Feed)
- inode.at (HRPT feed with 7 windings, part of my v2 design)
HRPT Satellites and Frequencies
Here is a short list of all HRPT Sat's that are known, can be helpful i think.
- NOAA-15 - 1702.5mhz - HRPT (weak due to omni antenna)
- NOAA-18 - 1707mhz - HRPT
- NOAA-19 - 1698mhz - HRPT
- MetOp-A - 1707mhz - AHRPT
- MetOp-B - 1701.3mhz - AHRPT
- FengYun-3B - 1704.5mhz - CHRPT
- FengYun-3C - 1698mhz - CHRPT
Two of my images
Both images where Received out of my back yard where anything below 20° or so is blocked by brick houses and trees.I had a Buffer overflow on the second image, as you can see there is a cut in Great Britain. There is a RGB and IR image for each of the both passes down below.