Ham STAMPFL RF SHARK Instruction Manual

0.04 - 30 MHZ
09.03.2020
HAM ELECTRONICS
AM-SSB-CW 0.04 - 30 MHZ
09.03.2020
sy RF SHARK
AM-SSB-CW 0.04 - 30 MHZ
www.heinzstampfl.ch
4;>*-1HANIELECTRONICS i`›Y
AM.SSB-CW 0.1.30 MHZ
0.04 - 30 MHZ
STAMPFE
HAMELECTRONICS r"`‚,"
BUILDING INSTRUCTIONS
SHORT WAVE RECEIVER KIT
DOUBLE SUPERHET, 10.7 MHZ-455 KHZ AM/LSB/USB/CW

• SYMMETRICALLYOPERATEDFIRSTMIXER(AD831)
•DDS LOCALOSCILLATOR(AD9851)
• 30MHzTCXOASAREFERENCEOSCILLATOR+-0.1PPM20C+-1PPM-10+60°
•DDSSYMMETRICOUTPUT
• 180 MHz DDS CLOCK (6 X 30 MHz)
•8POLE QUARTZFILTER1st IF
•SSB FILTERCFJ455K
•CORRECTFREQUENCYDISPLAYINSSBMODE
•10Hz100Hz1kHz 5 kHz 9 kHz step width
•TWO ONTHEBANDWIDTH6 -9KHZ
•AUDIOCW FILTER
•OPTICALROTARYENCODER(COPAL)
•LIGHTEDMULTIMECBUTTONS
•DIRECT DIAL BUTTONS AMATEUR RADIO AND BROADCASTING FREQUENCIES
• MEMOBUTTONSAVESALLSETTINGSBEFORESWITCHINGOFF
•SMAOUTPUTSTCXO,DDS-LO,1STIF(SPLITTERPSC2-1)FOREG.PANADAPTER
• 3.5 MM KH (STEREO)
•50OHMBNCANTENNACONNECTOR
•ANALOGS-METER"ONLYRELATIVEDISPLAY"
•MANUALPRESELECTOR
• WEIGHT: 1.7 KG
•480MAPOWERCONSUMPTION
•11-15VPOWERSUPPLY
• LENGTH 290 MM DEPTH 135 MM HEIGHT 110 MM
TECHNICAL DATA

UUUPS! KURZSCHLUSS, FE
H
•Heinz Stampfl, HB9KOC
•Mario Graf (grafdesign.ch)
• Rolf Hasler, HB9QN
• Dr. Ernst Kirschbaum. DL2EBV
•Alfred Klüss, DF2BC
•Mathias Köhler, DL9YEB
•Carmen Sommer
E-MAIL ADRESSE
[e-mail]
ES BESTEHT KEIN GARANTIEANSPRUCH AUF DEN BAUSATZ!
Bei Kurzschlüssen und rauchenden Köpfen bitte “ERSTE HILFE” nutzen.
ERSTE HILFE -
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ERSTE HILFE -
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75x
Component typeexiststwice
0.1 µF Use components from the strip!
The remaining lot is of lesser precision.
Images are high resolution.
Can be enlarged!
1. Collect a detailed report
2. Include photos of your construction in the E-Mail
2x (front and back of the print)
3. Remain Calm
4. Wait for help
OOPS!MALFUNCTION,FAULT? FIRSTAID(PROCEDURE)
Assembly Instructions from:
Thank you for the support !
TOOLS
•• Phillips screwdriver
•• Flat nose pliers
•• Soldering iron
•• Multimeter
•• Electronics pliers
•• Allen wrench 2 mm
•• Tweezers
•• Magnifying glass
•• Third hand
HINTS

FUNCTIONAL STATEMENT - RF SHARK
ANALOG PART:
The HF arrives at a 5-pole 30 MHz low pass fifilter via the antenna input. The
TP has the task of avoiding FM radiation and should have the highest
possible blocking effect over a wide frequency range. A steeply falling flflank is
not important here. The fifilter also does nothing to suppress image frequency.
In the case of receivers with a high intermediate frequency, the HF could be
passed on to the fifirst mixer directly or via fifixed bandpasses without an image
frequency problem. This is not possible with RF SHARK! The reason is the low
1st IF of only 10.7 MHz. If the preselector were not used, a second equivalent
receiving channel with 21.4 MHz plus the target receiving frequency would be
heard. RF SHARK's preselector consists of 4 manually tunable circles and a low
pass fifilter. The highest possible coil quality is very important. The higher the
quality, the narrower the pass band and the smaller the loss. In this case,
Amidon T80 ring cores are used. The input and output capacities enable
operation in 50-ohm technology.
A compromise must be made for the values of these coupling capacitors. If
small capacitance values are preferred, the fifilter becomes more selective.
Unfortunately, the insertion loss then increases. The reason lies in the capacitive
voltage divider, which then increases the insertion loss. The reason lies in the
capacitive voltage divider, which results from the transverse capacities of the
BB112. A double rotating capacitor is out of the question for reasons of cost,
space and procurement. So the choice fell on the original capacitance diodes
Siemens BB112. The switching of the individual fifilter areas can be done with
relays or switching diodes. In this case BA282, BA283 switching diodes are
used. These diodes are ideal for this application.
The low pass fifilter is not special, this relieves the fifirst mixer of signals above 3
MHz. The preselector type normally shows signals above 3 MHz in 50 ohm
technology. The preselector type normally shows its striking insertion loss in 50
ohm technology! Every dB insertion loss is no longer good and only leads to
additional noise for the receiver. Things look a little better with Shark. The
reason is the excessive resonance. This comes out a little better. This occurs
when the output load is signifificantly higher than 50 ohms. Due to the
symmetrical input circuitry of the 1st mixer, this is approx. 1.3k Ω. The
prefifiltered HF now reaches a very important part of every analog receiver.
1. Mixer
Preselector
30 MHz Low Pass Filter
Descriptionandfunctionofthevariouscomponents.
After the shortwave receiver kit of Junior 1 appeared in 2014, Junior 1D followed in 2016. Thanks to the detailed building instructions
and the matching-free design, the less experienced radio hobbyist was able to complete the kits with a sense of achievement. The
now third shortwave receiver kit is still suitable for hobbyists without special high-frequency measuring devices.

HF Splitter
SSB Filter
An ideally workingAGC for SSB must regulate the recipient as quickly as possible and keep
the recipient insensitive during speech or character pauses. In the SSB part of RF SHARK,
this is easily achieved using a large charging capacitor.
Unfortunately, theAGC is a bit too slow on the rising flflank. Strong SSB signals can lead to
distortion. In this case theATT -24 dB remedy. In other words, an ideal SSBAGC is not
possible with broadcast ICs. For true one-sided reception, the two side bands must be
separated!
This task is carried out by the SSB fifilter CFJ455K from Murata, which was installed in many
amateur radio devices in the 80s and 90s.
The language can only be understood by adding the missing carrier. Each sideband needs
its own beat frequency of 453 and 457 kHz. These signals are obtained from freely
programmable oscillators from Cardinal. Unfortunately, the application range is between 1
and 133 MHz. This is the reason for the 4-fold working frequency, which is then divided by a
factor of 4 using double-D flflip-flflops. The lower and upper sidebands must be compensated
by 2 kHz so that the frequency display is consistent with the SSB reception frequency. The
programmable oscillators from Cardinal are also suitable here.
The fifirst mixer in RF SHARK is an active double balance mixer with a high dynamic range.
If the mixer is additionally supplied symmetrically by means of an RF transformer, as in this
circuit, the maximum modulation increases by 3 dB. Sum and difference signals consisting
of the antenna and local oscillator frequencies are formed at the output of the fifirst mixer.
The mixer output is divided into two equivalent channels by means of an RF splitter, thus
enabling the 1st IF to be brought out in broadband. The second signal path is followed by
an 8-pin quartz fifilter. This only allows the difference signal to pass. The quartz fifilter is
forcibly matched using a 1.5 k resistor. If the quartz filter were operated directly with the
output resistance of the fifirst mixer, the fifilter's transmission curve would be very poor due to
strong ripples and asymmetrical edges. Thanks to the possibility of compensating the
insertion loss in the fifirst mixer, the resistance adjustment by means of 1.5 kΩhas no
negative impact.
The output of the quartz fifilter should be terminated with 1.5 kΩ. The fifilter is well
adapted due to the parallel connection of the inputs of the two A4100D and the
TDA1572. The fifiltered IF signal, which is greatly reduced in bandwidth, is now
ready to be converted into the second and last IF of 455 kHz. RF SHARK offers two
AM bandwidths. For this, not the fifilters are switched, but entire receiver blocks. The
A4100D is optimized for AM reception and shows very good noise behavior. The IC
is not suitable for SSB reception due to the lack of a regulated IF output.
The TDA1572 also shows very good technical data and has this output. It enables a
product detector to be connected using a small coupling capacity.
THE MIXER::
HF Transformer
Quartz fifilter
FUNCTIONAL STATEMENT - RF SHARK
When you select the sideband, not only does the matching local oscillator become active,
but also the one that mixes the 1st IF into the 2nd. The missing 2 kHz are added or
subtracted here. In the AM mode of operation, a third crystal oscillator of the same type
emits a central signal.
New in RF SHARK is a moving coil instrument for the display of the relative fifield strength.
This also serves as a coordination aid when operating the preselector. A 4 ohm
loudspeaker ensures powerful reproduction. But fifirst, diodes that work as switches must
feed the various audio outputs to the speaker amplififier. A 2.7nF capacitor in front of the
volume control frees the LF of HF residues.
For a better signal-to-noise ratio, the mass of the headphone jack is at the «minus» via a
100 Ωresistor. Astereo version is mandatory for headphone operation!

TCXO 30MHz
DDS AD9851
FUNCTIONAL STATEMENT - RF SHARK
THE DIGITALPART::
Processor
Output Transformer T1-1T
As in the previous JUNIOR 1D kit, anATMEL processor takes over the control and LCD
display. The processor continuously emits high-frequency interference. These are to be
suppressed directly at the outputs using a fifilter. The low-frequency components are
subsequently screened again using a low-pass fifilter.
An additional measure to suppress interference radiation is the ground area on the
underside of the board. The signal quality of the local oscillator is of the utmost importance
for a clean reception!
The quality is directly related to the clock frequency of the DDS.
Abasic rule says: The maximum required output frequency should not be higher than 40 -
50% of the clock frequency. In RF SHARK it is 180 MHz obtained from a 30 MHz TCXO of
high accuracy that is multiplied 6 times. In RF SHARK, the ratio of DDS clock and
generated LO signal is always less than 23%..
f the DDS signal generated is also taken off symmetrically by means of an HF transformer,
the purity increases, because the interference signals contained can only cancel each
other out. After passing through the 40.7 MHz low pass fifilter, the LO signal is ready to be
fed to the fifirst mixer. A very big improvement is the optical quality encoder. The slightly
higher additional costs are defifinitely worth it! Not only is a long lifespan ensured, the zero-
play concentricity guarantees an excellent feeling of coordination.
The bands can be selected directly using the "Amateur" or "Radio" buttons. The LCD
display with 4 x 20 characters shows the start and end frequencies of the desired band.
All control signals and the supply voltage are fed to and returned from the analog section in
duplicate via plug contacts. In a nutshell, RF SHARK is a powerful, safe and easy-to-use
shortwave receiver.

10k
8x
8x
470R
6x
100R
RESISTANCE: 1
We fifirst assemble the flflat components: We start with the resistors,
which we check for the correct value with the multimeter before
soldering.
Carbon fifilm resistors:
Colorcode:yellow|violet|brown|gold
Installation direction doesn't matter. (Included in excess 1x)
Color code: brown | black | black | black | brown
Metal fifilm:
Installation direction doesn't matter.
Metal fifilm resistors:
Color code: brown | black | black | red | brown

: 33R
3K3
1x
2R7
2x
11x
RESISTANCE: 2
We fifirst assemble the flflat components: We start with the resistors,
which we check for the correct value with the multimeter before
soldering.
Color code: orange| orange |black| gold| brown
Metal layer resistance
Metal layer resistance:
Carbon fifilm resistors:
Installation direction doesn't matter.
Color code: red | violet | black | silver | brown
Colorcode:orange|orange|red | gold

: 56R
: 100K
1x
2x
220R
1x
220R
2x
Metal layer resistance
Metal layer resistance
Metal layer resistance:
Carbon fifilm resistors:
Installation direction doesn't matter.
Color code: green |blue |black| silver |brown
Colorcode:brown | black | black | orange | brown
Colorcode:red | red | brown | gold
Color code: red | red | brown | silver | brown
Can also be included as a metal fifilm in the kit.
Included in the bag with the screws.
Installation direction doesn't matter.
Installation direction doesn't matter.
We fifirst assemble the flflat components: We start with the resistors,
which we check for the correct value with the multimeter before
soldering.
RESISTANCE: 3

BA282 / BA283
3x
K
K
K K K
1x
1x
20 MHz Quarz
Installation direction doesn't matter.
Keep the mounting direction in mind!
ATTENTION!:
DIODES, QUARTZ, HF TRANSFORMER: 4
HF TRANSFORMER
Note the dot!
Printed circuit board (30 MHz) is wrong
Switching diode type:
Keep the mounting direction in mind.

LED: 3 mm
10x
K
680 µH
6x
0,1 µF
34x
ATTENTION!:
Keep the mounting direction in mind!
Blockingcapacitors
Installation direction doesn't matter.
Abundant!
The shorter leg is the negative pole (K)
Observe mounting direction (Included in excess 1x)
Inductors:
Inductors
Colorcode:blue | gray |brown|silver
Installation direction doesn't matter. (Included in excess 1x)
CHOKES, LEDs, BLOCKING CAPS: 5

1x
1x
14 pol
40 pol
16 pol
1x
IC SOCKETS: 6
BEWAREOFMARKING!
The base and print must match.
Make sure that no short circuits are made.
Socket
Socket:
Socket:
Make sure that no short circuits are made !
Make sure that no short circuits are made !
Make sure that no short circuits are made !

IC: 7
IC: ATMEGA644
IC: MC14017
IC: 74LS74 (NICHT 74HC74 VERWENDEN)
1x
1x
1x
BEWAREOFMARKING!
Make sure that no short circuits are made.
ATTENTION !:Payattention to thelocation!
Bend the IC legs slightly inwards on the surface.
Bend the IC legs slightly inwards on the surface.
Bend the IC legs slightly inwards on the surface.
ALERT!:The IC typeandpositionmust be observed!
ALERT!:The IC typeandpositionmust be observed!

1x
30 MHz TCXO
Diode: 10A10 oder RL4A
90° 1x 1x
1x
1x
12ND05
K
1x
2x
MISCELLANEOUS: 7
Reference oscillator:
Keep the mounting direction in mind.
Keep the mounting direction in mind.
Keep the mounting direction in mind.
Switch-on relays:
SMBsockets:
standing, angled
On the 7805 voltage regulator, we bend the 3 feet at a 90
degree angle so that it coincides with the mounting hole on
the circuit board. Fix and solder using M3 x 5mm screw and
suitable nut.

2x
27p
22p
150p
2x
1x
1x
120p
2x
DISC CAPACITORS: 7
Disccapacitor:
Disccapacitor:
Disccapacitor:
Disccapacitor:
Installation direction doesn't matter.
Installation direction doesn't matter.
Installation direction doesn't matter.
Installation direction doesn't matter.
DCsocket
In the small bag with the push button and brass spacers.

2x
2x
T37-6
18 cm / 7 in
T37-6
18 cm / 7 in
1x
1x
TOROID, SOCKET HEADER, POT: 8
METHOD!:
Wind wire on toroid, shorten and pre-tin. From 350 ° the
wire can be tinned directly.
Toroid:
Toroid:
Wire length:
Wire length
Coils:
Coils:
In the RX packaging
In the RX packaging
6 (The fifirst insertion is considered one turn.)
8 (The fifirst insertion is considered one turn)
16-pin socket connector (LCD)
25 turn 10K Poti
It will later be used to adjust the contrast of the LCD display.

1 µF
220 µF
1x
13x
5x
1x
1x
Electrolytic Capacitors & Buttons: 9
Electrolytic capacitor:
Electrolytic capacitor:
ATTENTION!:Payattentiontopolarity!
ATTENTION!:Payattentiontopolarity!
The longer wire is the positive pole.
The longer wire is the positive pole..
Push button with extension and greencap
Push button with extension and yellowcap
Push button with extension and red cap
Keep the mountingdirection in mind!
Keep the mountingdirection in mind!
Keep the mountingdirection in mind!
(Note the step in the button housing) see detailed photo
(Note the step in the button housing) see detailed photo
(Note the step in the button housing) see detailed photo

1x Transistor: BC547
4x
4x
1x
2x M3 x 12
M3 x 5
TRANSISTOR / SPACER / SOCKET STRIPS: 10
Keep the mounting direction in mind.
Spacers:
Spacers with:
M3 x 25 x 6
M3 x 12
tighten. (Short back)
attach. (Long front)
Spacers:
Screws:
M3 x 5
M3 x 12
Female headers:
2 x 2 / 2 x 5 / 2 x 10
point backwards.
See page 14.
Spacers
Screws:
Mount on the back of the print

1x
DISPLAY: 11
Pin header:
16 pin.
keep the mounting direction in mind.
Long pens point down.

1
2
3
4
5
LEDs are used to control the switching voltages for the preselector and
the modulations.
FUNCTIONAL TEST: 12
ON/OFF Control
Apply voltage. 11 - 15V. The controller board must be able to be switched on and off with a
click. All buttons and the display must light up.ATT excluded.
Set the display contrast using the 25-turn potentiometer.
If the memory is empty, the display shows MHz - 65535 Hz STEP.
Check the amateur band button
When the button is pressed again, all appear one after the
other
When the button is pressed again, all amateur radio bands appear one after the other.
Check the radio button
When the button is pressed again, all broadcast bands appear one after the other.
Check the STEP button
When the button is pressed again, all frequency steps appear in succession:
10 Hz, 100 Hz, 1K Hz, 5K Hz, 9 KHz.