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A simple Simsmith model for exploration of a common EFHW transformer design – 2t:14t
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https://owenduffy.net/blog/?p=22904
A simple Simsmith model for exploration of a common EFHW transformer design – 2t:16t
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Yet another ferrite toroid calculator – but is it any good?
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https://owenduffy.net/blog/?p=22852
Feasibility study – loop in ground for rx only on low HF – signal / noise degradation (SND) – more detail
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https://owenduffy.net/blog/?p=22833
Feasibility study – loop in ground for rx only on low HF – signal / noise degradation (SND)
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https://owenduffy.net/blog/?p=22811
Signal to noise degradation (SND) concept
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https://owenduffy.net/blog/?p=22789
Gamma matches get blamed for a lot of stuff
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https://owenduffy.net/blog/?p=22778
Estimating characteristics of a sample of coax from dimensions and properties
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https://owenduffy.net/blog/?p=22766
On testing two wire line loss with an analyser / VNA – part 3
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https://owenduffy.net/blog/?p=22740
On testing two wire line loss with an analyser / VNA – part 2
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On testing two wire line loss with an analyser / VNA – part 1
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The mower appears affected by Ethanol
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The mulcher appears affected by Ethanol
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https://owenduffy.net/blog/?p=22690
Do I ‘need’ a masthead preamp to work satellites on 2m? – G/T vs G/Ta
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https://owenduffy.net/blog/?p=22673
QEX on SWR dependence on output impedance #2
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https://owenduffy.net/blog/?p=22654
Chinese chainsaw review – SX25 #1
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https://owenduffy.net/blog/?p=22631
QEX on SWR dependence on output impedance
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https://owenduffy.net/blog/?p=22619
Measurement of one of those ham lore components – figure 8 twinline
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https://owenduffy.net/blog/?p=22595
Do I ‘need’ a masthead preamp to work satellites on 2m? – terrestrial noise scenario
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https://owenduffy.net/blog/?p=22571
Honda GX390 6kVA genset maintenance
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https://owenduffy.net/blog/?p=22578
Do I ‘need’ a masthead preamp to work satellites on 2m? – space noise scenario
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https://owenduffy.net/blog/?p=22545
MFJ-261 – review of review
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https://owenduffy.net/blog/?p=22524
On testing coax cable loss with an analyser / VNA – part 4
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https://owenduffy.net/blog/?p=22513
On testing coax cable loss with an analyser / VNA – part 3
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https://owenduffy.net/blog/?p=22490
On testing coax cable loss with an analyser / VNA – part 2
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On testing coax cable loss with an analyser / VNA – part 1
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Review of inexpensive Chinese thermostat – DST1020
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https://owenduffy.net/blog/?p=22427
Small 2-stroke engines and popoff pressure
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Small engines and green fraud
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https://owenduffy.net/blog/?p=22334
JDY-31 Bluetooth SPP module
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IoT water tank telemetry project – 4-20mA / 1MPa pressure transducer trial
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https://owenduffy.net/blog/?p=22311
Measuring a 1/4 wave balanced line – nanoVNA
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https://owenduffy.net/blog/?p=22279
Measure transmission line Zo – nanoVNA – PVC speaker twin – loss models comparison #3
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https://owenduffy.net/blog/?p=22262
IoT water tank telemetry project – HC-SR04 – third trial
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https://owenduffy.net/blog/?p=22254
Measure transmission line Zo – nanoVNA – PVC speaker twin – loss model derivation
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https://owenduffy.net/blog/?p=22235
CirroMazzoni Baby small transmitting loop – a desk study
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https://owenduffy.net/blog/?p=22153
A template for an air filter foam element
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IoT water tank telemetry project – HC-SR04 – second trial
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https://owenduffy.net/blog/?p=22137
Pitfalls of series stub matching with coax
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https://owenduffy.net/blog/?p=22120
IoT water tank telemetry project – JSN-SR04T-3.0 – first trial
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BME280 vs BMP280
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IoT water tank telemetry project – ultrasonic sensor
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IoT water tank telemetry project – GY-US42v2 – first trial
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Coil former made of cast acrylic sheet
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IoT water tank telemetry project – HC-SR04 – first trial
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https://owenduffy.net/blog/?p=22053
An interesting study in the effect of fixture on impedance measurement
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https://owenduffy.net/blog/?p=22044
A common scheme for narrow band match of an end fed high Z antenna – surely it is a 1:9 transformer?
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A common scheme for narrow band match of an end fed high Z antenna
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Replacing the crystal in a Seiko V158-0AD0 watch
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https://owenduffy.net/blog/?p=22012
IoT water tank telemetry project – ultrasonic sensor – HC-SR04
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November 2021
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RC models
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RPi
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Slot cars
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Small Transmitting Loops
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AIM use & issues
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Designing high performance VHF/UHF receive systems
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Exploiting your antenna analyser
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IC-7410 tests
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nanovna
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Noise FIgure Meter
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RFPM1
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A simple Simsmith model for exploration of a common EFHW transformer design – 2t:14t
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https://owenduffy.net/blog/?p=22904
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Continue reading A simple Simsmith model for exploration of a common EFHW transformer design – 2t:14t
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01/11/202102/11/2021
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nanovna
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A simple Simsmith model for exploration of a common EFHW transformer design – 2t:16t
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Continue reading A simple Simsmith model for exploration of a common EFHW transformer design – 2t:16t
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31/10/202102/11/2021
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nanovna
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Yet another ferrite toroid calculator – but is it any good?
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https://miguelvaca.github.io/vk3cpu/toroid.html
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Calculate ferrite cored inductor (from Al)
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Ferrite permeability interpolations
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Continue reading Yet another ferrite toroid calculator – but is it any good?
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21/10/202122/10/2021
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Feasibility study – loop in ground for rx only on low HF – signal / noise degradation (SND) – more detail
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Feasibility study – loop in ground for rx only on low HF – signal / noise degradation (SND)
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Continue reading Feasibility study – loop in ground for rx only on low HF – signal / noise degradation (SND) – more detail
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14/10/202114/10/2021
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Amateur Radio
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Feasibility study – loop in ground for rx only on low HF – signal / noise degradation (SND)
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Feasibility study – loop in ground for rx only on low HF
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Continue reading Feasibility study – loop in ground for rx only on low HF – signal / noise degradation (SND)
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10/10/202114/10/2021
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Amateur Radio
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Signal to noise degradation (SND) concept
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Continue reading Signal to noise degradation (SND) concept
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10/10/202115/10/2021
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Amateur Radio
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Gamma matches get blamed for a lot of stuff
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Continue reading Gamma matches get blamed for a lot of stuff
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09/10/202109/10/2021
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Amateur Radio
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Antennas
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Estimating characteristics of a sample of coax from dimensions and properties
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On testing two wire line loss with an analyser / VNA – part 3
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Continue reading Estimating characteristics of a sample of coax from dimensions and properties
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29/09/202101/10/2021
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Amateur Radio
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Transmission lines
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On testing two wire line loss with an analyser / VNA – part 3
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On testing two wire line loss with an analyser / VNA – part 1
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Continue reading On testing two wire line loss with an analyser / VNA – part 3
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24/09/202124/09/2021
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Amateur Radio
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Transmission lines
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On testing two wire line loss with an analyser / VNA – part 2
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On testing two wire line loss with an analyser / VNA – part 1
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Continue reading On testing two wire line loss with an analyser / VNA – part 2
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23/09/202101/10/2021
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Amateur Radio
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