# weather satelite receiver and decoder

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#### ghettoman

##### Full Member level 1

im curently building a receiver to receive weather satelites pictures.if anyone is interested please post a relpy or email me to exchange opinions.

#### Hardwarekiller

##### Member level 1

Hi !

When will an 100% Wether Picture must have an verry expensiv Elektronik (2500 Euro)
An auto Dish is needet, for Profi Wetherrecive !
For the first testing recive an Wetherpicture whis low buget ist this a cheep Circuit
For an easy Reciver take this
The Wether Sattelit give 2 russian Sattelit (OKEAN and METEOR)
Recive on 137 MHz.
For the Satellitentracker­Programm take "STS­Plus" for the Kepler Data.
https://www.dransom.com/stsplus.html
For the Antenna take an 1,20 Meter Dish
I hope i can help you ?

Excuse my
My English is not good, i am german

By

Mike

#### twinsen

##### Full Member level 1

Are you busy with a receiver for APT on 137Mhz or HRPT on 1.7Ghz?

Before you go to too much trouble there are a few 137Mhz receiver designs on the web... There are not too many downconverter designs for 1.7Ghz though (In fact I havent found one...)

#### ghettoman

##### Full Member level 1

Hardwarekiller thank you for the links you provided but there are usles.firs of all the receiver if shoud have a 30 khz bandwith and second the link is just an ordinarydownconverter for 50 mhz.

most of the weather receivers use mc 3362 a double IF exchange fm receiver for the pll control they use a so42 or a mc145106(not available in romania ) controled by a pic or by a dide matrix.the hard to find piece is a 455khz filter with a banwith of 30khz made by murata or toko.

Yes im now interested in apt reception because the decoder for hrpt is hard to build(fcpga&stuff)

twinsen there are schematics for convertors from 1g to 130m for hrpt
i~v find some but i dont have the links so do a google :wink: search yourself

#### ghettoman

##### Full Member level 1
hrpt decoder

https://ozon.homepage.dk/engelsk.htm
https://www.emgola.cz/gb_137141/photogallery_gb.htm
and i have the schematics of one of the first wefax receivers presented in tele-satellit by doctor dish but is in pdf version.the schematic has a lot of ci (old times :lol: )

for the dutch receiver build only the receiver section the pll synth can be made more easy with new circuits.just do a google search

#### Gian

##### Junior Member level 1

Hi,

Now I work in a development of a Meteosat receiver (1.7 GHz) and a software to decoder HPRT (I will use programs found in internet that use a soundcard to decode image).

This receiver will be added a NOAA station (137 MHz) made 3 years ago (but now need a new decoding software). Now, I'm studying use of a Yagi antenna because is cheaper than a parabolic dish.

Project goal is convert 1.7 Ghz to 137 MHz in order to use NOAA station. I've designed a LNA, band pass filter and local oscillator (all with discrete components). Actually I work in a downconverter design, I will decide use a IC or a discrete component (dual gate FET).

#### ghettoman

##### Full Member level 1
137 mhz yagi

very interesting.do you have a web page or something to show youre equipment.by the way what ic did you use for the receiver and the bandpas filters are home-made or do you use the toko 30khz bandwith filter

#### toonafishy

##### Full Member level 6
turnstyle+antenna

For 137MHz the design is not hard. Signals are strong > -100dBm. I built one with a GasFET LNA and a P/h/i/l/i/p/s FM backend chip and a M/o/t/o synth chip. I used M/u/r/a/t/a cheap ceramic filters (30kHz). With a simple turnstyle antenna, I could copy the satellites if they were at least 15 degrees above the horizon. The W/e/a/t/h/e/r S/a/t/e/l/l/i/t/e H/a/n/b/o/o/k (A/R/R/L) by Dr T/a/g/g/a/r/d is the book you need.

#### Gian

##### Junior Member level 1

Ghuettoman,

In this moment, i dont have any web page to show my project. Finally, I will use IAM91563 from HP, like a mixer. I've implemented LNA with two transistors (GaAs FET Siemens CFH120-08) connected in cascade to achieve a 24 dB gain and a 0.2 dB noise figure.

The oscillator was designed by me, a VCO (connect to ground) with -70 dBc noise phase (this VCO was designed for a MVDS application, and I've profited it for this project).

Band pass filter is CFL455AG2 from Murata.

If you want more information, no doubt to ask me.

#### Gian

##### Junior Member level 1
weather sat receviers

With Antenna are two options:

A Yagi with 55 elements that provide 20 dB of gain (3 m length), and a yagi with dish like basic element (smaller than 55 element's yagi). Both options are in studying.

I've forgett attach transistors data sheet in last post. They are here:

#### runner100

##### Junior Member level 3
137 mhz filter

Thanx for all the info I will try to build one of these systems myself.

Runner100

#### mirvidon

##### Member level 1
if circult in weather receiver

Hi,

I need a progam in Matlab to decote de signal of a noaa satellite. I have a .wav file with the signal and I need the picture. Anyone can help me?.

Regards.

#### azie

##### Newbie level 3

Hye..
Now I am doing my final year project, design satellie receiver using SA602..can anybody help me or give me a guidance? Im really confusing right now. thank u

#### rfmw

##### Advanced Member level 2
weather sat pll

Any good HRPT receivers or decoders on the web? VHDL code?

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