| Title |
Date (DD/MM/YY)
|
Categories |
|
The G0KSC hybrid balun |
08/05/13 |
Baluns |
|
Peak amplifier for Bird 43 coupler
directional wattmeter by F6DFZ |
03/05/13 |
Equipment |
|
Acrylic plinth for small card modules |
02/05/13 |
Equipment |
|
Sensorless brushless DC motor - an
explanation |
28/04/13 |
Equipment |
|
Antenna analyser accuracy on extreme
impedances |
27/04/13 |
Measurement |
|
Interpretation of transmitting triode valve
data sheets for RF power amplifiers |
21/04/13 |
Transmitters |
|
The failure of lossless line
analysis in the real world |
30/03/13 |
Transmission Lines |
|
Power Amplifier Run On Timer (PAROT) |
29/03/13 |
Equipment |
|
Bowral G5RV for local contacts |
18/03/13 |
Antennas |
|
A comparison of a G5RV at VK1OD and QW
vertical at VK2DVK on 40m over a 14,700km path using QRSS |
17/03/13 |
Antennas |
|
Generic heating / cooling controller |
16/03/13 |
Equipment |
|
Arduino thermometer - a
tutorial |
09/03/13 |
Equipment |
|
Factorise integer |
09/03/13 |
Software |
|
Wade's statistical nature of noise |
05/03/13 |
Measurement |
|
Thinking aloud on the VK3XDK
10GHz transverter receiver performance |
02/03/13 |
Equipment |
|
Morse beacon keyer for a cluster of
transmitters |
06/02/13 |
Equipment |
|
Capturing QRSS3 with Spectrum Lab |
06/02/13 |
Antennas |
|
Mastech MS6514 review |
21/01/13 |
Equipment |
|
QST Jan 13 wire antenna loading |
16/01/13 |
Rigging |
|
VK1KW QRSS beacon on 2m 15/01/13 |
15/01/13 |
Antennas |
| Yet
another comparison of two 40m quarter wave verticals with elevated radials
over a 14,700km path using QRSS |
14/01/13 |
Antennas |
|
Another comparison of two 40m quarter wave verticals with elevated radials
over a 14,700km path using QRSS |
05/01/13 |
Antennas |
| Spotless days around solar
cycle transition Jan13 |
02/01/13 |
Propagation |
|
Distribution of S/N ratio under fading on
HF |
30/12/12 |
Antennas |
|
A comparison of a 40m quarter wave
verticals with elevated radials and horizontal dipole over a 14,700km path
using QRSS |
24/12/12 |
Antennas |
|
A comparison of two 40m quarter wave
verticals with elevated radials over a 14,700km path using QRSS |
23/12/12 |
Antennas |
|
Thoughts on "Improved Dynamic-Range
Testing" by Doug Smith |
16/12/12 |
Measurement |
|
Another Morse beacon keyer - A/B RF switching |
13/12/12 |
Equipment |
|
Hand wound power transformers |
07/12/12 |
Equipment |
|
Fan controller for Manson EP-613 /
Jaytech MP-3082 with fan |
02/12/12 |
Equipment |
|
Button cells in digital calipers and the
like |
20/11/12 |
Equipment |
|
Compatibility of HRD/DM780 with
Digi Portserver TS4 |
16/11/12 |
Equipment |
|
Ameritron ATR-30 |
15/11/12 |
Equipment |
|
Palstar AT2K |
13/11/12 |
Equipment |
|
GPS PPS Utility (gpsppsu) |
11/11/12 |
Equipment |
|
PllLdr - EEPROM data structure |
07/11/12 |
Equipment |
|
Simple Morse beacon keyer - EEPROM data
structure |
02/11/12 |
Equipment |
|
Measuring RF power with an SSB receiver |
24/10/12 |
Receivers |
|
RS232 Morse keyer |
17/10/12 |
Equipment |
|
Dangerous male to male power adapters |
15/10/12 |
Measurement |
|
Prolific PL-2303 problems |
10/10/12 |
Hardware |
|
An A/B comparison on 40m over a 17,000km
path using QRSS |
08/10/12 |
Antennas |
|
S meter calibration and scale shape |
05/10/12 |
Receivers |
|
AVR ATTiny programming adapter |
01/10/12 |
Equipment |
|
An A/B comparison on 40m over a 14,700km
path using QRSS |
23/09/12 |
Antennas |
|
Simple Morse beacon keyer - update V3 |
22/09/12 |
Equipment |
|
Simple Morse beacon keyer - using ATB |
20/09/12 |
Equipment |
|
Another simple Morse beacon keyer - basic,
but accurate |
18/09/12 |
Equipment |
|
Measuring the velocity
factor of coaxial transmission line |
16/09/12 |
Transmission Lines |
|
Making inferences from QRSS grabber
observations |
12/09/12 |
Measurement |
|
ATB - a bootloader for AVR Tiny
microcontrollers |
11/09/12 |
Software |
|
Postbox - a user testimony |
03/09/12 |
Software |
|
A narrowband current balun using coax line
sections |
26/08/12 |
Baluns |
|
A simple explanation of the
voltage forcing property of a half wave transmission line |
12/08/12 |
Transmission Lines |
|
Lithium polymer batteries for ham
radio applications |
12/08/12 |
Equipment |
|
PC high voltage RF capacitors |
11/08/12 |
Antennas |
|
Using a slide rule to solve deciBel
problems |
09/08/12 |
Measurement |
|
PllLdr application - Si4133G
(VK3XDK Agile PLL) |
05/08/12 |
Equipment |
|
RF current sampler |
31/07/12 |
Equipment |
|
Skin depth calculator |
22/07/12 |
Software |
|
Estimating Matched
Line Loss from Return Loss |
18/07/12 |
Transmission Lines |
| Field Strength
Meter
(FSM) update -
V1.6.0 |
15/07/12 |
Software |
|
QRSS observation utilities |
08/07/12 |
Receivers |
|
Manson EP-613 / Jaytech MP-3082
improvement |
03/07/12 |
Equipment |
|
QRP QRSS Beacon Transmitter - on air |
02/07/12 |
Receivers |
|
QRSS grabber @ VK1OD |
26/06/12 |
Receivers |
|
QRP QRSS Beacon Transmitter |
15/06/12 |
Equipment |
|
Setting up shunt matching with
an MFJ259B or the like |
07/06/12 |
Antennas |
|
Matching a 5/8λ vertical -
example 1 |
05/06/12 |
Antennas |
|
Calculate ferrite cored inductor |
31/05/12 |
Software |
|
Identifying ferrite materials |
29/05/12 |
Baluns |
|
Thinking aloud on pipe cap
filters |
14/05/12 |
Transmission Lines |
|
High frequency
compensation of T/R relay |
05/05/12 |
Transmission Lines |
|
The merit of measuring VSWR
on an open wire line |
02/05/12 |
Transmission Lines |
|
VK2WI AM broadcast on 7.146MHz - quality
issues |
02/05/12 |
Other |
|
Synthesisers and external reference
clocks |
29/04/12 |
Equipment |
|
Australian amateur population trends 1998
- 2011 |
21/04/12 |
Other |
|
Anatek ESR Meter - VK1OD implementation |
14/04/12 |
Equipment |
|
Terminating a single core hard wire on an insulator |
01/04/12 |
Rigging |
|
MCU to load PLL configuration registers
update |
30/03/12 |
Equipment |
|
PllLdr application - BH1415F |
30/03/12 |
Equipment |
|
dB, dBi, and dBd |
19/03/12 |
Antennas |
| Field Strength
Calculator
(FSC) update -
V1.0.13 |
13/03/12 |
Software |
|
Noise Figure Meter (NFM) update -
V1.12.0 |
13/03/12 |
Software |
|
Effect of reduced drive on Class
B amplifier efficiency |
13/03/12 |
Transmitters |
|
Comment on W8JI's 2006 coil
measurement experiment |
05/03/12 |
Antennas |
|
Are RF toroidal inductors self
shielding |
26/02/12 |
Baluns |
|
Balanced ATUs and common mode
current |
22/02/12 |
Baluns |
|
A worked example of a Bird 43
with a grossly mismatched load |
19/02/12 |
Transmission Lines |
|
Thunderbolt GPS Disciplined
Oscillator - VK1OD implementation |
09/02/12 |
Equipment |
|
137.7kHz QRSS on one chip
(revised 3/2/12) |
03/02/12 |
Transmitters |
|
Improving weak signal identification of FSK
beacons |
03/02/12 |
Equipment |
|
Effective Radiated Power (ERP) |
17/01/12 |
Antennas |
|
Jaycar MI5104 inverter |
16/01/12 |
Equipment |
|
DTR / RTS interface unit |
15/01/12 |
Equipment |
|
Insertion Loss vs Transmission
Loss |
15/01/12 |
Transmission Lines |
|
Adjusting a loaded HF vertical |
13/01/12 |
Antennas |
|
PllLdr application - AD9850/51
300Bd FSK |
08/01/12 |
Equipment |
|
ZL1AN's transmission line
challenge |
09/01/12 |
Transmission Lines |
|
Setup of an FM AFSK transmitter |
06/01/12 |
Transmitters |
|
APRS AFSK on VHF |
04/01/12 |
Transmitters |
|
PllLdr application - AD9850 |
28/12/11 |
Equipment |
|
Is the 133' centre fed multiband
dipole a no-brainer |
26/12/11 |
Antennas |
|
Calculate Vpk and Irms for given power at
complex load |
26/12/11 |
Software |
|
N0XAS ID-O-Matic - VK1OD
implementation |
09/12/11 |
Equipment |
|
A medium priced generator set from
eBay |
07/12/11 |
Equipment |
|
An
experimental CPLD based PLL (revised) |
03/12/11 |
Equipment |
|
Comment on W5DXP's 2011 coil
measurement experiment |
18/11/11 |
Antennas |
|
Exploitation of NEC's GM card |
14/11/11 |
Antennas |
|
T Match efficiency estimator |
12/11/11 |
Software |
|
Ambient noise survey, Hackett ACT
on 40m, 06/03/2009 |
12/11/11 |
Software |
|
PA0KLT Si570 Synthesiser - VK1OD
implementation |
12/11/11 |
Equipment |
|
Matching a 5/8λ vertical |
03/11/11 |
Antennas |
| In pursuit of dipole resonance with an
MFJ259B revised |
02/11/11 |
Antennas |
|
Is Zs of a HF ham tx typically 50+j0? |
20/06/10 |
Transmitters |
|
A test of Zs on an IC7000 |
01/08/10 |
Transmitters |
|
Link coupling transformation ratio
(expanded 29/10/11) |
29/10/11 |
Transmitters |
|
Learning models or a poor workman
always blames his tools |
28/10/11 |
Antennas |
|
Bootstrap
coax traps for
antennas (expanded 10/11) |
26/10/11 |
Antennas |
|
Differential flux leakage in a
Guanella 1:1 balun |
26/10/11 |
Baluns |
|
ATLLC Examples |
10/10/11 |
Software |
|
RF Arbitrary Transmission Line Loss Calculator |
09/10/11 |
Software |
|
Estimating parameters of two wire transmission lines |
07/10/11 |
Transmission Lines |
|
Noise bridge measurement
case study - Bowral dipole |
07/10/11 |
Measurement |
|
Noise bridge measurement case study - shortened vertical
monopole matching |
06/10/11 |
Measurement |
|
Filament Management in Amateur
Radio applications |
28/09/11 |
Transmitters |
|
Does twisting a two
wire open line reduce radiation |
23/09/11 |
Transmission Lines |
|
Can a balun alter the tuning of an
antenna system |
13/09/11 |
Baluns |
|
Spoiling Class B |
12/09/11 |
Transmitters |
|
440Hz (A4, A440) reference oscillator |
11/09/11 |
Hardware |
|
Return Loss |
06/09/11 |
Transmission Lines |
|
Misunderstanding VSWR misleads |
03/09/11 |
Transmission Lines |
|
G4CQM 50Ω coaxial dipole |
02/09/11 |
Antennas |
| Spotless days around solar
cycle transition Sep11 |
02/09/11 |
Propagation |
|
Calculate braid coverage |
31/08/11 |
Software |
|
137.7kHz oscillator |
28/08/11 |
Transmitters |
|
1kHz reference oscillator |
27/08/11 |
Hardware |
|
Dipole loaded vertical coax feed line |
13/08/11 |
Antennas |
|
Portable generator sets and RCD
protection for Amateur Radio field stations |
07/08/11 |
Hardware |
|
QRP2000 Synthesiser |
05/08/11 |
Hardware |
|
DHL shipment performance |
05/08/11 |
Miscellaneous |
|
Avoiding flashover in baluns and
ATUs |
05/07/11 |
Transmission Lines |
|
RX1 Noise Bridge improvement |
22/06/11 |
Measurement |
|
Codan 7004 - WSPR 40m |
20/06/11 |
Receivers |
|
Designing with the GI7BT |
14/06/11 |
Transmitters |
| Convert
Vpk-Vrms-dBV-dBu-mW-dBm |
11/06/11 |
Software |
| Antenna
Effective Aperture |
05/06/11 |
Antennas |
| Measuring RF
impedance by the three voltmeter method |
04/06/11 |
Measurement |
|
Measuring common mode current |
30/05/11 |
Measurement |
| Pi coupling a single ended valve RF Power Amplifier |
28/05/11 |
Transmitters |
| Calculate RF amplifier pi coupler |
28/05/11 |
Software |
| Designing
with the GS31B |
23/05/11 |
Transmitters |
| Calculate initial load line of valve RF amplifier |
22/05/11 |
Software |
| Bowral 7MHz dipole for local
contacts (updated) |
22/05/11 |
Antennas |
|
Designing the operating point for a grounded grid Triode Class B RF amplifier |
16/05/11 |
Transmitters |
| Using
my Excel cubic spline interpolation
functions |
07/05/10 |
Measurement |
| A perspective on the popular 4:1
Ruthroff balun at the base of a ground mounted untuned multi-band
vertical |
06/05/11 |
Baluns |
|
Comment on QEX article - "Coaxial Traps for Multiband Antennas, the True
Equivalent Circuit" |
02/05/11 |
Antennas |
| A
review of the Aoyue 937+ |
17/04/11
|
Other
|
| Electronic fluorescent light
starters |
15/04/11
|
Other
|
| Heater
Delay Timer |
12/04/11
|
Hardware
|
| DTR
- PTT interface adapter |
10/04/11
|
Transmitters |
| RX1 Noise Bridge - VK1OD build |
08/04/11
|
Measurement
|
QRZ
forums
|
04/04/11
|
|
| ARRL Noise Bridge
worked example reworked |
03/04/11
|
Measurement
|
| Generic
noise bridge calculator |
02/04/11
|
Software
|
| RX1, RX2
Noise bridge calculator |
02/04/11
|
Software
|
| Definition: Current Balun,
Voltage Balun |
19/03/11
|
Baluns |
| Baluns in antenna systems |
20/12/10
|
Baluns
|
| Yaesu
FL2100Z |
25/11/10
|
Transmitters
|
Folded Half Wave Dipole
|
24/10/10
|
Antennas |
| Half Folded Half Wave Dipole |
20/10/10
|
Antennas |
| Tapping an air cored RF inductor |
19/10/10
|
Transmitters
|
| StationMaster on 40m |
15/10/10
|
Antennas |
| Exploration of a design for an
80m vertical antenna - Part I |
14/10/10
|
Antennas |
| Counterpoise - what does it mean? |
10/10/10
|
Antennas |
| A simple explanation of the
so called current forcing property of a quarter wave transmission line |
06/10/10
|
Antennas |
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