Minikits EME117 User manual

SPECIFICATIONS: Frequency Range 135 – 141MHz
Input Sensitivity 0.223uV for 12dB SINAD -120dBm
Bandwidth 1stIF10.7MHz230kHzBW@3dB
2ndIF455kHz30kHzBW@6dB
Frequency Tuning Varicap Tuned VCO with AFC circuit &
Temperaturecompensation.
OptionalExternalPLLSynthesizer.
Audio Output Speaker Output 8 to 32ohms up to 500mW
PC Audio Output Filtered for connection to a
soundcard2vp-p
Power +12vdc100mA
DESCRIPTION: Updated April 2011 to use the replace-
ment BF998R MesFET. The complete Weather Satellite
Receiver is built on a single 95 x 80mm size PC board &
takes around 4 hours to construct. The receiver is designed
around Motorola’s MC13135P double conversion superhet
receiver IC. The IC contains a complete receiver & has a
dual conversion IF, two local oscillators & FM
demodulator. The internal Varicap diode is used on the
first local oscillator for frequency tuning. The circuit board
has been designed for easy connection of an optional PLL
Synthesizer for tuning, & 10.7MHz wideband FM IF
demodulator for WEFAX reception on 1691MHz.
RECEIVER DESIGN: It took many months collecting
information on Weather Satellite reception & receiver
design, before I had some idea of what was required. The
following is a wish list for a receiver design.
1/ Low cost single board design self contained re
ceiver just plug in an antenna & connect to the
computers sound card.
2/ Simple single chip FM receiver design with a low
component count.
3/ PLL synthesizer to allow scanning of the Weather
Satellite frequencies, & a mute circuit to stop scan
ning automatically.
4/ Receiver IF Bandwidth of 40kHz @ 3dB.
5/ PLL FM demodulator to track the IF for Satellite
doppler shift.
6/ Separate adjustable audio output suitable for direct
connection to a computers sound card.
7/ Good receiver sensitivity but able to reject adjacent
channel interference & overload from pagers &
Orbcomms.
8/ Able to be used or modified for use with a
1691MHz downconverter for WEFAX.
Most of the above has been achieved except the use of a
PLL Synthesizer which can be an additional option. A
clever way of tracking doppler shift with a reduced IF
bandwidth requirement has been adoptod, & will be
explained in the circuit description. Most designs use
either the dual conversion MC3362P or MC13135P
Motorola chips as a complete FM receiver. I decided on a
dual conversion FM receiver design using the Motorola
MC13135P chip as the MC3362P was found to be obsolete.
It seems that the MC13135P has recently suffered the same
fate, but there are still plenty available worldwide. The
most important design issue was the IF bandwidth
requirement of the receiver. The only known problem with
a dual conversion design is getting enough bandwidth from
the second IF of 455kHz. Most articles indicated that a
bandwidth of at least 30kHz @ 3dB was required, &
preferably 40kHz @ 3dB to accommodate up to +/- 3kHz
doppler shift. Suitable filters were looked at for 10.7MHz
& 455kHz. The cost was the main consideration, so
ceramic filters were the preferred over high cost crystal
filters. After checking suppliers I finally found some 50kHz
@ 3dB wide 10.7MHz filters in a large quantity. The
455kHz filters were found to be easier to obtain & the
widest bandwidth available was 30kHz @6dB. This is
possibly a little narrow but seems to be the widest available
in 455kHz filters, & have been commonly used in weather
satellite receiver designs for 137MHz. It was only found
out when the prototype receiver was built, that the 50kHz
filters were not usable due to the tolerance of the center
frequency of the filters, & the 10.245MHz computer
crystals. This caused the down mixed IF frequency to be
slightly off 455kHz, & in combination with the 455kHz
filter the 30kHz BW was much reduced. It was then
discovered to get around the problem, most designs used a
wide band 280kHz 10.7MHz filter for the first IF, which
does not seem to affect the performance with the 455kHz
filter doing most of the work. I have opted to use a slightly
narrower 230kHz wide filter as these were easy to obtain.
CIRCUIT DESCRIPTION: Refer to the circuit diagram.
The antenna input signal passes through the input tuned
circuit & is amplified by the BF998R MesFET. The output
is then filtered by a 3 stage 135 to 141MHz bandpass filter.
The filter effectively removes unwanted signals outside the
passband including pager interference on 150MHz before
being input to pin 22 of the MC13135P IC. The input
signal on 137.500MHz is mixed with a free running Voltage
Controlled Oscillator, VCO on 148.200MHz to produce a
10.7MHz IF output on pin 20. The VCO consists of the
.COM.AU 137MHz Weather Satellite Receiver EME117 Ver3
Minikits
®
Copyright © Mini-Kits www.minikits.com.au Revised 17/11/2014
DISCONTINUED PRODUCT

internal oscillator on pins 2 &3, along with the internal
varicap diode on pin 23 & 24, & a number of external
components including the VCO coil L5. The 10.7MHz IF
output on pin 20 is filtered by a 230kHz BW @ 3dB
10.7MHz ceramic filter before going into Pin 18 to the
second mixer. The 10.7MHz IF is then mixed with a fixed
10.245MHz crystal oscillator on pins 5 & 6 to produce a
455kHz IF output on pin 7. The 455kHz IF is then filtered
by a 30Khz BW @ 6dB 455kHz filter before going into pin
9 to the FM limiter & demodulator. The demodulator
consists of the 455kHz demodulator coil along with a
10kohm resistor across the coil to widen the demodulator
BW. The raw audio is then output on pin 17 & goes both
to the AFC & audio amplifier circuits. The AFC circuit is
very effective in keeping the oscillator on frequency with
temperature changes, & being able to track a Satellites
doppler shift. The circuit consists of a high gain BC549C
along with a 4k7 NTC thermistor & associated
components. The 470ohm ( Option 1 ) resistor sets the
capture & hold in range. The capture range is around
40Khz, with the hold in range being much greater. The DC
voltage on pin 17 will vary according to the doppler shift,
or if the signal received is slightly off tuned. The voltage
biases the BC549C & adds or subtracts a small amount of
DC voltage across the tuning pot. The voltage variation is
then fed back to the varicap diode to readjust the VCO
frequency. When the AFC switch is in the normal
position, the AFC circuit still adds some temperature
compensation to the VCO, but cannot capture & hold in a
signal. The tuning circuit consists of a 100kohm 25turn
trimpot for course preset tuning, & a 20kohm trimpot for
fine tuning. The 100kohm is set initially to the prefered
receive frequency, e.g. 137.500MHz , & the 20kohm
finetuning trimpot is used if the received signal cannot
quite be captured by the AFC circuit. For extra receive
channels a rotary switch along with more 100kohm 25 turn
trimpots can be added as shown in the circuit diagram. The
S meter & Squelch circuit uses the Receive Signal Strength
Indicator, RSSI voltage on pin 12 along with the internal
operational amplifier, pins 14, 15, & 16. The Offset2
trimpot sets the DC output on pin 16 to 0 volts when there
is no received signal. When a signal is received, the DC on
pin 16 of the MC13135P increases to drive the meter &
squelch circuits. The 50kohm Squelch trimpot sets the
threshold bias on the BC547 transistor that controls the
operation of the MC34119 Audio Amplifier. As the
voltage increases from pin 16 the transistor is biased on
which lowers the voltage on pin 1 of the MC34119
effectively turning on the audio amplifier to drive the
speaker. The 47uF capacitor on pin 1 slows the mute
circuit for smoother squelch operation. The Mute output is
used to control an optional external PLL Synthesizer to
stop scanning frequencies when a signal is received. The
audio circuit consists of a 2 stage operational amplifier to
drive the MC34119 & PC audio output. The first stage of
the TL072 IC is used to drive the MC34119 audio amplifier
via the main Volume1 trimpot. The second amplifier is
used to increase the audio level to a suitable level to drive a
PC sound card. The Volume2 trimpot sets the audio level
which is filtered by the 470ohm & 10nF capacitor on the
output to cut audio frequencies above 3kHz. This
effectively gets rid of high frequency noise that can degrade
the quality of the Weather Satellite pictures.
CONSTRUCTION:
1. The PC Board supplied is a Professional plated through
hole board. This makes it much easier to construct the Kit &
avoid any potential construction errors. Most components
except the BF998R & SMD 4k7 NTC resistor are soldered
on the top groundplane side of the PC board.
2. Follow the PC Board overlay diagram and circuit
carefully, when checking the components and placing them
onto the board. The first part of construction is to fit the
small EME180 PC board & the BF998R MesFET to the
board. It may be easier to solder the small PC board to
the main EME117 board first before soldering the
BF998R. One lead on the BF998R is fatter & this is the
source connection, ( S ). Next tack solder one lead of the
BF998R to the small board, & check that you have the
MesFET the correct way around before completely soldering
into place.
3. Next fit the small 4k7 NTC SMD, ( Negative Tempera-
ture Coefficient ) resistor to the bottom side of the board.
4. Next start fitting the smaller components to the board that
include the resistors followed by the ceramic capacitors . It
is suggested that you check each resistor with a multime-
ter as the colours are getting more difficult to read due to
poor paint colour before fitting. There are many ceramic
capacitors & care should be taken to make sure that the val-
ues are correct before fitting to the board.
5. Next install the transistors, Integrated circuits, & trim-
pots. Be careful when fitting the MC13135P IC as they
are static sensitive. IC sockets should not be used with
the MC13135P as it can cause instability. A 1uH SMD
RF Choke is not supplied for the Option2 position on the
board. Refer to the notes in the options section.
6. Next fit the Toko coils. When soldering in the coils in
the metal cans, make sure that you identify the cold earth
end of the coil that is indicated by a small cut out in the
metal can. This is the side of the can that has the printed
writing stamped onto it. The input coil L1 should face
towards to BF998R, while the 3 coils L2, L3, & L4 after the
BF998R should face towards the VCO coil L5. The VCO
coil L5, should face towards the AFC/Normal link.
7. A Inline Header is supplied for the wire connections to
the PC board. Simply cut the header to the lengths required
& solder into the board. Alternatively Header Plugs &
Sockets can be purchased & fitted to allow easier
disconnection of the board from external circuitry.
8. Check your construction carefully, checking that you
have no shorts, solder dags etc before applying any power to
the board. Most faults are caused by solder dags &
incorrectly fitted component values.
Copyright © Mini-Kits www.minikits.com.au Revised 17/11/2014
137MHz Weather Satellite Receiver EME117 ver3
DISCONTINUED PRODUCT

1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
A A
B B
C C
D D
E E
F F
3p9
6.8pF
0.09uH
BF998R
100k
100k
47n 47R
0.09uH
10pF
1pF 1pF
0.09uH
12pF
1pF 1pF
0.09uH
10pF
5p6
RFC
0.1uH
+5V
1nF
Option2
47pF120pF 10.245MHz
56
10nF
21
22
12pF
2
1
470pF
4.7pF
24
0.09uH
10pF
23
1uH
1nF
100k
1nF
4.7k
10nF
3
390R
20
18 19
SFE
0.1uF
+5V
0.1uF
4
+5V
10k 455kHz
13
CFU
455B2
30kHz
BW
9
8
7
4k7
1k
20k
Offset2
15
16
1k 0.1uF
12
14
0.1uF
0.1uF
11
10
20k
Meter 10k
S Meter
+5V
4k7
BC547
1k
50k
10k
10k
Squelch
Speaker
PC Audio
10k
1k
10k
1nF
10k
3
2
81
5
67
4
TLO72
1uF
10k
17
10uF
10k
10k
+5V
+5V
10uF
50k
Volume1
10k
Volume2
10uF
470R
10nF
0.1uF 2k7 68k
10uF 4.7uF
2
3
7
8
54
10uF
+12v
6
MC34119
2k2
47uF
+5V
Mute
1
Speaker
Line Out
0.1uF
0.1uF
78L05
5V Regulator
10uF
+5V IN
GND
OUT
1k
47uF
1nF
5k
4k7
4k7
Offset1
+5V
Norm
AFC
1k
1k
4k7 NTC
15k
+5V
BC549C
390R
470R
470R
Option1
+5V
Fine Tuning
100k
Tuning
25Turn 10k
Antenna
Xtal
Demod
10.7MS2
1uF
MC13135P
20k
2nd LO
Demod
+
-
1st LO
Limiter
PLL
VCO
+12V
EME117 137MHz RECEIVER Ver 3
COPYRIGHT MINI-KITS 2011
Not
Fitted
10.7MHz Out To
Sound Input
From External
Demod
External FM Demod
100k100k100k100k
Optional
2 Pole 6 Position
Channel Switch
137.300MHz 137.400MHz 137.500MHz 137.620MHz 137.850MHz
1
234
5
B
C
A
AFC SWITCH
& Mixer
& Mixer
G1
G2 D
S
L1
L2
L3 L4
L5
5x 100k
25 Turn
+12V
1
2
3
4
5
Original
trimpot
DISCONTINUED PRODUCT

TESTING & ALIGNMENT:
1. Alignment is straight forward, although some form of
signal source or VHF signal generator is an enormous help.
Set all 4 ferrite cores in the Toko coils to approximately
3mm below the tops of the cans. The ferrite cores in the
Toko coils are very fragile so only the correct plastic
hex trimmer tool should be used. Metal screwdrivers
etc will easily break the cores.
2. Using a current regulated powersupply apply +12vdc
to the board & check that the current is 100mA or less.
Connect a suitable speaker to the board & turn the
Volume1 trimpot up until noise is heard from the receiver.
Make sure that the Squelch trimpot is turned off,
( Fully Clockwise ).
3. Put the AFC switch in the AFC position. Adjust the
100kohm 25 turn trimpot to the middle of its range. Set the
fine tune trimpot to mid position. Short the antenna input
to ground & measure the DC voltage at the AFC switch
with a multimeter. The switch is now changed to the
Normal position & the Offset1 trimpot is now adjusted to
read the same DC voltage.
4. With the antenna input still shorted, adjust the Offset2
trimpot for 0 Volts on Pin 16 of the MC13135P.
5. The next lot of adjustments 5 to 7 are with the AFC
switch in the normal position. We start with alignment of
the first voltage controlled oscillator, VCO. For a receive
frequency of 137.500MHz, the oscillator is tuned 10.7MHz
higher to a frequency of 148.200MHz. The frequency can
be measured by connecting a frequency counter to the
VCO output pin on the PC board, or by monitoring the
signal on a suitable FM receiver tuned to 148.200MHz.
Adjust the oscillator coil L5 until the local oscillator carrier
is on frequency. The tuning of L5 will be quite large with
only a slight adjustment but just get it close to
148.200MHz. As the VCO is freerunning any movement
of the board, or temperature changes will cause the VCO to
change frequency. It is preferable that the board be
mounted on 10mm or higher PCB spacers on each corner
of the board in a suitable box. For initial alignment, the
board can be supported with the PCB spacers on the
workbench .
6. Next connect a signal generator tuned to 137.500MHz
to the antenna input. Adjust the 100kohm 25turn trimmer
if required until the signal is heard from the speaker.
Adjust Inductors L1 to 4 for maximum output on the signal
meter. Modulate the signal generator with a 2.4kHz
sinewave with 30kHz deviation & adjust the 455kHz
demodulator coil for minimum distortion on the audio
signal from the speaker. An Oscilloscope can be connected
to the audio output & the demodulator coil adjusted for
minimum distortion of the sine wave.
7. If you are using the optional channel switch with
additional 100kohm 25turn trimmers, then set each one to
the required frequencies of 137.300MHz, 137.500MHz,
137.620MHz etc using the signal generator to tune them in.
All frequency tuning should be done with the AFC in the
normal position. When all frequencies have been tuned
then the AFC should be turned on.
8. Most alignment above can be made without test
equipment by receiving a Weather Satellite signal.
RECEIVER BOARD CONNECTIONS:
1. The PC audio output is suitable for connection to a Sound
Blaster or similar card. Use suitable shielded audio cable
with a 3.5mm stereo plug on one end. Connected the center
of the cable to the tab on the plug that corresponds to the far
end of the 3.5mm plug. This is the left channel. Plug the
3.5mm plug into the microphone input of the sound card.
With the software supplied with the sound card, set the
mixer record volume level to +21, & the microphone input
to about half level. Check that there is noise from the PC
speakers. The PC audio level trimpot on the Receiver
should be turned fully clockwise. For the recommended
Software, refer to the separate Notes on Weather Satellite
Reception.
2. The Antenna connection can simply be soldered directly
to the board. An Optional F type R/Angle socket can be
fitted to the board to allow the use of RG6 cable with F type
connectors for the antenna cable.
3. Any 8 to 32ohm Speaker can be used on the Receiver.
The Speakers Volume1 is independent of the Line Output
Volume2.
4. For an S Meter any low cost surplus meter can be used.
The S meter is not really required, but does give an
indication on how strong the satellite signals are.
5. The AFC / Normal connection can be connected to an
external toggle switch. The switch should be set to the
normal position when tuning in a signal, before the AFC is
turned on.
6. A PLL Synthesizer Option is currently not available.
Spare holes are located in the PC board near the VCO coil
L5 for the PLL loop filter components.
OPTIONS & NOTES:
1. The 470ohm Option 1 resistor sets the capture & hold in
range of the AFC circuit. The capture area with the 470ohm
is around +/- 40kHz. The capture area can be lowered to
around +/-15kHz by replacing the 470ohm with 0ohms.
2. The 1uH SMD Choke, ( L1.0u ) Option 2 can be fitted to
feed +12 volts up the antenna cable to power an optional
preamplifier. The choke should not be fitted if a
preamplifier is not used. An external preamplifier should
not be required if low loss RG6 or similar cable is used to
the antenna. An external preamplifier may cause overload of
the receiver from strong out of band signals.
3. An optional PLL Synthesizer could be connected to the
receiver for automatic scanning of the Weather Satellite
Copyright © Mini-Kits www.minikits.com.au Revised 17/11/2014
137MHz Weather Satellite Receiver EME117 ver3
DISCONTINUED PRODUCT

frequencies. The PLL input & VCO output connections on
the board connect to the Synthesizer. The Mute output is
used to tell the microprocessor when a signal is received to
stop the PLL scanning the channels. There is currently
no plans to produce a PLL Synthesizer Kit to suit this
receiver.
4. An external 10.7MHz FM demodulator connection is
provided on the board. This can be used for an optional
external wideband 280kHz IF, for Japans geostationary
GMS5 Satellite. The audio from the external demodulator
can be fed back into the input of the TL072 as show on the
circuit diagram. The 10kohm resistor on pin17 of the
MC13135P would need to be lifted on the 1uF capacitor
side & a switch fitted for switching between the two
demodulators.
The MC13135P seems very sensitive to static so if you
want to experiment with the Kit, make sure that the
power is turned off before soldering anything on the
board.
PARTS LIST:
RESISTORS
1 x 0R 1/4 Watt Resistor
1 x 47R 1/4 Watt Resistor
2 x 390R 1/4 Watt Resistor
3 x 470R 1/4 Watt Resistor
7 x 1k 1/4 Watt Resistor
1 x 2k2 1/4 Watt Resistor
1 x 2k7 1/4 Watt Resistor
5 x 4k7 1/4 Watt Resistor
11 x 10k 1/4 Watt Resistor
1 x 15k 1/4 Watt Resistor
1 x 68k 1/4 Watt Resistor
3 x 100k 1/4 Watt Resistor
1 x 4k7 NTC SMD 0805NTC Resistor
TRIMPOTS
1 x 5k TPV 5mm Trimpot Resistor
1 x 10k TPV 5mm Trimpot Resistor
3 x 20k TPV 5mm Trimpot Resistor
2 x 50k TPV 5mm Trimpot Resistor
1 x 100k 25Turn Trimpot Resistor
CAPACITORS
4 x 1pF Ceramic Capacitor
1 x 3p9 Ceramic Capacitor
1 x 4p7 Ceramic Capacitor
3 x 5p6 Ceramic Capacitor
1 x 6p8 Ceramic Capacitor
2 x 10pF Ceramic Capacitor
1 x 12pF Ceramic Capacitor
1 x 47pF Ceramic Capacitor
1 x 120pF Ceramic Capacitor
1 x 470pF Ceramic Capacitor
4 x 1nF Ceramic Capacitor ( 102 )
3 x 10nF Monolythic Capacitor ( 103 )
1 x 47nF Monolythic Capacitor ( 473 )
8 x 0.1uF Monolythic Capacitor ( 104 )
3 x 1uF Electrolytic Capacitor
1 x 4.7uF TKR Electrolytic Capacitor
5 x 10uF EB 63v Electrolytic Capacitor
2 x 47uF TKR 35v Electrolytic Capacitor
SEMICONDUCTORS
1 x 78L05 5 Volt Regulator
1 x BC547 Transistor NPN
1 x BC549C Transistor PNP High Gain >500
1 x BF998R FET Dual Gate SMD
1 x TL072 Dual Operational Amplifier IC
1 x MC34119P Audio Amplifier IC
1 x MC13135P FM Receiver IC
INDUCTORS
5 x 0.09uH Coil TOKO 100 073 Marked On Can
1 x 455KHz Demodulator Coil Xicon 7P F201
1 x 1.0uH RF Choke ( Brown Black Gold )
Looks like a green resistor
FILTERS
1 x LTU/CFU455B2Murata 455kHz ( 30kHz BW @ 6dB )
1 x SFE10.7MS2 230kHz BW @ 3dB ( L10.7S )
MISCELLANEOUS
1 x PC Board EME117C
1 x PC Board EME180 ( suit BF988R )
1 x Instructions EME117C
1 x 10.245MHz Computer Crystal
1 x Inline PCB Header
1 x PCB 2 pin Header Link
OPTIONAL NOT INCLUDED IN KIT
1 x Meter Low cost for the S Meter
1 x Speaker 8 to 32ohms
1 x F Socket R/Angle ( For Antenna Connection )
1 x Switch SPDT For the AFC / Normal selection
1 x 1.0uH SMD RF Choke Option2 Part # L1.0u
For Product Support www.minikits.com.au
Copyright © Mini-Kits www.minikits.com.au Revised 17/11/2014
137MHz Weather Satellite Receiver EME117 ver3
DISCONTINUED PRODUCT

WEATHER SATELLITES: The notes below are to
help the people that are new to Weather Satellite
Reception. There are currently three Satellites on the
137MHz band that are operational 2/1/11.
Please check status on http://homepage.ntlworld.com/
phqfh1/status.htm
NOAA 15 137.620MHz
NOAA 17 137.500MHz ( On but No images )
NOAA 18 137.9125MHz
NOAA 19 137.100MHz
Only Infrared pictures are available when the Satellites are
going over at night time. Picture quality can be rather
grainy & dark with little colour at dusk or dawn.
ANTENNAS:
A circular polarized antenna like the Quadrifilar Helix or
Turnstile is required to give acceptable signals. An
omnidirectional antenna for the 144 to 148MHz band can
be used, but signals are quite weak as the satellite gets
higher than 20 degrees above the horizon due to the
radiation angle of the antenna. Good noise free signals
have been received on a quadrifilar Helix at only 3 metres
above the ground. Signals however were only receivable
from around 20 degrees above the horizon. Increasing the
antenna height would improve this. With around 10 metres
of low loss RG6 cable, a receive preamplifier should not be
required. If a preamplifier needs to be used, then one with
a tuned input filter is required to reject strong out of band
signals like pagers on 150MHz. To receive low angle
signals a circular polarized cross yagi, & azimuth /
elevation rotator would be required.
COMPUTER:
A PC with a Soundblaster or similar audio card is required
for the processing of the audio signal. Computer
interference has been noted on 137.620MHz. The problem
was radiation from the cables feeding a Scanner. The
Scanner is now switched off when receiving NOAA 17 on
137.620MHz. Interference was also able to be minimized
by rotating the antenna for a null. Antennas like the
Quadrifilar Helix do still have nulls.
SOFTWARE:
1. The WX software suggested will allow you to get your
Weather Satellite Receiver going easily & quickly. All
software is available from the www.satsignal.net WEB site.
There are other software packages available but the
WXTRACK & WXSAT are free & easy to use. An
additional audio record level program WXREC may also
be useful.
2. Load the WXTRACK software & click the SETUP
button & set your location in WXTRACK. The available
Satellites are listed in the SETUP screen. Drag the
required APT Satellites into the Active box. Select Noaa
15, 17, 18, 19, & Meteor 3-5. Update the satellite KEPS by
clicking OPTIONS & then UPDATE KEPS. Your
computer will connect to the NORAD web site &
automatically download the latest KEPS. Make sure that it
has downloaded the weather.txt, & noaa.txt files into the C:/
wxtrack folder. While you are still on the WEB, go to a
search engine & search for the current UTC time. Set your
computers clock to this time.
3. For decoding & displaying the Weather pictures use
WXSAT. It will allow you to display the picture from the
Weather Satellite, along with being able record & playback
WAVE files. Load the software & click on the
PARAMETERS button & select either NOAA 4+4 or
Meteor depending on the satellite you want to display when
it comes into view. Click the PARAMETERS button &
then the DECODING button & set the selection on the
bottom RHS of the window to N-S or S-N depending on
which direction the Satellite is traveling from. When you
are just starting to receive the signal from the Satellite, click
the RECORDING button & click PICTURE & WAVE
FILE. WXSAT will then start recording the audio from the
receiver as a WAVE file & start displaying the picture on
the screen. A slight adjustment of the fine tuning on the
receiver may be required when you first receive the signal.
4. The software WXREC can be used to check the audio
record level into the soundcard. Load the software & click
on the icon to start the program. The program will display a
record level indicator that can be set with the mixers record
level. When a satellite is received, set the record level to
NOAA or Meteor depending on what you are receiving. I
have not found the record level to be accurate, & had to
turn it down slightly.
5. For any Software problems read the information on
the satsignal WEB site as your computer may need extra
files that can be downloaded from there.
REFERENCES:
www.minikits.com.au/down.htm
WxtoImg Software http://www.wxtoimg.com/
WXSAT Ver2.5 Christian H Bock
WXTRACK Ver 3.7.2 David J Taylor
http://www.satsignal.net/
WXREC Satlevel ver1.1.0 David J Taylor
ARRL Weather Satellite Handbook Dr Ralph E Taggart
137MHz Antenna
http://www.jcoppens.com/ant/qfh/index.en.php
http://www.qsl.net/kf4cpj/qha/
Copyright © Mini-Kits www.minikits.com.au Revised 17/11/2014
137MHz Weather Satellite Receiver EME117 ver3
DISCONTINUED PRODUCT

DISCONTINUED PRODUCT