Antennas:
-
Trio
Star antenna for 2m in PDF - trio
star antenna.rar (470kb)
-
L/2
antenna
-
JPOL
antenna for packet radio
-
6/9
element VHF YAGI
- 9 element
YAGI antenna for 2m band
- 75m
antenna tuner
- 16 element
YAGI for 20m and 70cm
- 70cm
vertical antenna
- HF
antenna tuner
- Duplexer
filter for 2m and 70cm dual band antenna
- 5/8 vertical
antenna for 2m
- JPOLE for 440
MHz
- Super JPOLE
antenna
- A Feasible
Full Sized 40 Meter Beam
- A DISCONE
antenna project
- Logperiodic
dipole array
- Multi Band
Antenna Traps
- 6 Element 1255 MHz Yagi for portable
ATV use: about.txt, pic1,
pic2, pic3,
pic4, pic5
Audio
aplications:
- AF
power amplifier with TDA 2002
- AF power
amplifier with LM386
- Speech
processor with elektret mike
- Simple
audio preamplif for electret mike
- CM
microphone preamplifier
- i-Fi
AF Preamplifier
- Microphone
preamplifier and filter
- SSB
and CW filter, AF amplifier
- Automatic
Gain Controll
- Mike
compresser
- Simple audio
preamplifier
- Audio preamplifier
with LM358
- Low noise,
high gain microphone amplifier
- HF Receiver Tone converter
Fox
hunting:
-
Fox
hunting trcvr control unit with Microhip PIC microcontrollers
- 80m
fox hunting receiver
Frequency
meter, digital scale:
- Digital
scale with PIC 16F84
- Frequency
meter with PIC 16F84
- Universal
frequency counter & voltage meter (link)
- Second
generation of universal frequency counter & voltage meter (link)
- 3.5GHz prescaler
(divide by 1000)
- CMOS frequency
meter
Generator:
- Marker
generator with PIC 12C509
- Marker
generator with PIC 16F84
- Tone
generator with PIC 16F84
Keyers:
- Morse
Code Speedometer using the PIC 16F84
Measuring:
- RF signal
meter with LED
- Single chip digital
voltmeter with ICL 7129ACPL
- Inductance
meter
- S.W.R. meter
- 2400MHz
signal source
- DVM with ICL7107
- dvm.zip
- Antenna
analyzer 88-960MHz
Misc.:
-
AM/FM FAX interface
: GIF1 / GIF2
/ GIF3 / GIF4
/ GIF5 / GIF6
-
Antenna
changer
-
PC DTMF decoder with
M8870 IC : GIF1
/ GIF2 /
Decoder program /
readme.txt
-
Antenna
rotor
- Universal
PTT for digital communications using a sound card
- Wide range gate DIP
oscillator
- Collection
of quartz crystal ladder filters
by S56AL (link)
- RF Calculator
for Microsoft Excel spreadsheet program
- RF
Isolator Uses Differential Amplifiers
- Tiny Crystal
Oscillator with NC7504M5
single-gate AC logic and LP2980 low-dropout 3.3 volt regulator
- Low Distortion
Crystal Oscillator
- Battery
Monitor with PIC16C71
- A
low-cost high-performance RF-powersensor
- High Fidelity FM Stereo Modulator
Circuit : Pictures and PostScript
files
- Basic RF oscillator
Packet
radio:
-
"Cheap"
1k2 packet radio modem
-
TNC2
- version by my friend HA8FY (Zsolt)
-
The most
simple radio modem for
RTTY, CW, SSTV
-
1K2
packet radio modem with TCM3105
- 1k2 packet
radio modem with TCM3105 (vers2)
-
1k2
packet radio modem with XR2211
- 1k2
packet radio modem with FX614 (MX614) - schematic
Power
amplifier:
- 2m
power amplifier by LA0BY/DF9PY
- 50MHz
power amplifier by JH0WJF
- 80m
hexfet power amplifier by W7ZOI
- High
dynamic range RF amplifier
- 1296MHz high
gain amplifier
- 432 MHz
kilowatt amplifier by W1QWS
- 60W solid-state
UHF linear power amplifier (for 432 MHz) by K2OVS
- 350W QRO
with GK71 for 160-15m
- 100W
HF linear amplifier with MRF454
- 100W HF
linear amplifier with GU50
- One Watt Class-C
Amplifier
- 10w HF amplifier
with KT907
- 1w HF QRP
- 25w QRO with
PL504
- 5w QRP with KT907
- 13cm
power amplifier
- Converting
a PCS Power Amplifier to 13cm Ham Radio Band
- 23cm 40W PA
with M57762
- 23cm 20W PA with
M57762
- 15W
amplifier with MRF136
Power
source:
- Finesse
Voltage Regulator Noise
- 13.8V/65A power
supply
- 1.25-25V/2.5A
power supply
- 13.6V
/ 10A power supply
- ±0-28V power
supply
- 13.8
V / 15 A from a PC Power Supply
- Car
NiCd Charger
- 1.2-30V/1.5A
variable regulated power supply
- 12V/6A power
source
- The
smart switch
RF
Preampliers:
-
2
Meter GaAs FET Preamp by KD9JQ
-
U310
FET preamplifier
-
23
cm GaAs FET Preamplifier
- Generic High
Gain 3 Stage IF amplifier
- Front
end
- TS711A
1st IF amplifier ~ 16dB gain
- Wide
Band High OIP, low noise amplifier
- 6m
preamplifier by W1FB
- RF
preamplifier by VE7GC
- 1296MHz
GaAs FET Premplifiers
- 70cm Preamplifier
- Fet preamplifiers
for 2m and 70cm
- Low
noise preamplifier for 23cm
- Low
noise preamplifier for 50 and 144 MHz
- Bandpass
Filters
RX:
- VHF
FM receiver with TDA7000
- 80m direct
conversion receiver by VK1PK
- Superhet receiver
for 80m band by VK3YE
- 3-30 MHz AM receiver
- Ramsey 40m
receiver
- 80m
one chip receiver with NE602
- Simple 80
or 40m receiver
- TDA7000 FM receiver aplication notes
and examples: page1, page2,
page3, page4,
page5, page6,
page7, page8,
page9, page10,
page11
Synthesizers/VFOs:
- CMOS
RF synthesizer
- DDS synthesizer kit
- DDS
VFO
- 10.1MHz
VFO
- DDS
/ PLL based universal synthesizer by S56AL (link)
- 144
MHz DDS
- HT220
frequency synthesizer by WA4DSY
- 3 band VFO
(160-80-40m)
Transceivers:
-
2m
FM transceiver in PDF - 2m.rar
(880kb)
-
70cm
WBFM transceiver for packet radio by YO5CRI in PDF - 70cm.rar
(510kb)
- (SUPER!) T7F
- 70cm FM/FSK transceiver by Holger Eckardt, DF2FQ
- Voice
Operation with the T7F
- User
interface for T7F
- 19200Bps
with the T7F
- Schematics
and PCB's for T7F
- Terminal
for
programming the T7F
- 20m
10W SSB transceiver by JF1OZL
- 160m 6W
CW transceiver by JF1OZL
- 80m
5W CW transceiver by JF1OZL
- 80m
10W SSB transceiver by JF1OZL
- 70cm
QRP SSB transceiver by JF1OZL
- Simple 70cm
QRP FM transceiver by JF1OZL
- Simple 6m
CW transceiver by VE7GC
- 40m transceiver by K8IQY: GIF1
, GIF2 , GIF3
- Pocket sized 20m
(or 30m) single band 4W CW transceiver by S56AL (link)
- 80m
5W SSB/CW transceiver by
S56AL (link)
- 6m
SSB/CW transceiver by S56AL (link)
- 3W
FM transmitter
- 3 band HF transceiver:
- 14
MHz SSB 10mW transceiver
by JF1OZL
- 3.5MHz
SSB 10w transceiver
by JF1OZL
- 50MHz
10mW handy transceiver
by JF1OZL
- 430MHz
SSB transceiver by JF1OZL
- 7MHz
CW transceiver with
MC3362 by JG1EAD
- HF
all band SSB-CW transceiver
by JG1EAD
- HF 5 bands
SSB-CW transceiver by EI9GQ
- 13cm 50mW ATV
TRCVR
- 23cm 1.5W ATV
TRCVR
- Low-cost
ATV 23cm preamp with
CF300
- Wideband
FM 10GHz transceiver
with 30MHz IF
- 2.3GHz
ATV transceiver
- 23cm FM ATV transceiver by S51KQ:
pic1, pic2,
pic3, pic4
- 13cm FM ATV transceiver by ON7IZ:
pic1, pic2,
pic3, pic4
- VHF
NBFM Single Channel Transmitter using MC2833
- 88-108MHz
FM exciter
- Simplest
RF transmitter (wireless
microfone)
- Simple tracking
transmitter with
transistor
- Simple
tracking transmitter with LM3909 IC
- Miniature
FM transmitter (wireless microfone)
- Miniature FM
transmitter (wireless
microfone)
- Miniature FM
transmitter (wireless
microfone)
- VHF NBFM Single Channel Transmitter
using MC2833
- 144MHZ tranceiver by IK3OIL, Francesco Morgantini
- “Grid Dip Oscillator” (GDO), by Giuseppe I3FNG
- A PIC16F876 based, automatic 1.8 – 60 MHz SWR/WATTmeter
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