In connection with the new decoder and satellite, it became necessary to modify the receiver. Was based on the old sheme HPR-137. The modification consists of adding a new selector KSH-148, control module (ATMega8+LCD16x2) and the necessary switching.
Assembled receiver HPR-137 with Aoyama decoder:
Figure of printed circuit boards here >>>.
In CPU module using ATMega8 (TQFP32) . I recomended LCD WH1602J.
Firmware and sources >>>.
The receiver used in conjunction with the downconverter converts the 1691 MHz to 137.5 MHz. Thus IF = 1553.5 MHz. Supported frequencies, and switches (for the decoder):
Frequency |
Satellite |
Mode |
Switches |
| 1700.4 MHz | FY-1D | CHRPT | SW-A(off) SW-B(on) |
| 1702.5 MHz | NOAA-15 | HRPT | SW-A(on) SW-B(on) |
| 1698.0 MHz | NOAA-19/17/16 | HRPT | SW-A(on) SW-B(on) |
| 1707.0 MHz | NOAA-18 | HRPT | SW-A(on) SW-B(on) |
| 1700.0 MHz | Meteor-M N1 | MHRPT | SW-A(on) SW-B(off) |
| 1704.5 MHz | FY-3A / 3B | HRPT | SW-A(on) SW-B(on) |
| 1701.3 MHz | Metop-A | HRPT | SW-A(on) SW-B(on) |
| 1691.0 MHz | Meteosat-7 / 8 | HRPT | SW-A(on) SW-B(on) |
| 1695.15MHz | Meteosat - 9 | HRPT | SW-A(on) SW-B(on) |
| 1707.9 MHz | TATYANA2 | HRPT | SW-A(on) SW-B(on) |
Img1. During the reception, Meteor-M N1.
Excellent image obtained with Meteor-M N1, NOAA, FY1D.
Meteor-M N1 2011-01-13 10h34m rgb-corrected
NOAA19 2011-01-12 13h18m rgb-corrected
**************************Update****************************
The original level meter was working very badly because temperature drift. I've updated this unit by adding a U10 LT5537 chip.
The result - was a very accurate measuring:
A new scheme:
I spent the calibration level, using the Rohde&Schwarz FSL-6 analyzer:
Here: dBm - level at the receiver input, V - RSSI voltage, S - data displayed on the LCD.
There is no temperature dependence. Stable readings.
New firmware and source are available here....
Also, LCD has been replaced, with a new backlight:
New summer image:
2012-06-30T141504-NOAA-18
------------------------Upd. Jul 2012-----------------------
