|Tech Corner||Summary||Post date||Author|
|Linux sound, for applications such as FLDIGI, WSJT and WSPR||
You want a USB sound device to dedicate to radio,
|Software Defined Radio (SDR) for Linux, with a RTL2832 based USB TV stick||
Which Linux to load
All the pre-compiled binaries need GLIBC 2.15 so, we need:
PC or laptop must have USB 2
Easy GUI receiver Software
|FM Repeaters on 23cm||
A new 23cm repeater is active at Chatswood on 1273.200MHz +20MHz offset, with no tone required for access. The repeater produces a 91.5Hz tone at the output during operation.
|Locking the Icom IC-910 to a Rubidium Standard||
If you want to gain high stability and high frequency accuracy for your IC-910 or any Icom radio that uses the 30.2Mhz as its local oscillator then this article is for you.
|VK2TIM's online Blog site||
I've created my own website (based on Drupal, just like this one).
|A subtone encoder for allowing older radio's to use repeaters||
This is a simple subtone encoder that anyone can build, which will generate 123Hz (default), 91.5Hz -or- both at the same time, for convenient repeater access. I have to advise, that I am not sure of the legality of running both 91.5Hz and 123Hz at the same time, but it does work :)
|A simple 30w class C PA unit for 2m use||
This is a power amp that is great for giving your 2m HT a bit more grunt.
|A GPS driven "No need to set" clock/compass/speedo||
A GPS based clock using a 16F628A PIC, and a EM406A GPS Module - Hardware by VK2TIM, Original Firmware, design and concept by Ken, VK7KRJ
|Audio Function Generator with Frequency and P-P voltage display||
This is an audio signal generator that does sine or square wave, operates from 20Hz to just over 30Khz, has a frequency display with 1Hz resolution, and a P-P output voltage indicator with a resolution of 100mV.
|Building a Dummy Load and Measuring Power Accurately||
The title says it all. This article is published with the permission of the author, Ken Kemski K4EAA.
|Roger Beep Unit by Peter VK2PJZ||
This unit is designed to run in line with your microphone so requires no modifications to your transceiver.
|A 16F88 PIC Based Clock and Calendar using a Dallas DS1307 RTC Device for battery backed up timekeeping||
I've been at it again, this time, I have coded for a clock that shows time and date, will keep time accurately with no DC applied as it is interfaced to a Dallas DS1307 timekeeper.
|A compact 1:1 Choke Balun with decent power handling, for less than $50||
Here is a simple weatherproof choke balun, capable of 100w+ power handling, compact in size, neat looking and low cost.
|Checking the Calibration of your SWR meter and constructing a dummy load.||
There is a simple way to check if your SWR bridge is working correctly.
You will need a 5 watt resistor, not wire wound, of 75 ohms and 100 ohms.
|Suppressing RF Interference||
Ferrite is your friend, and more often than not, the simplest solution to RFI problems.
|PIC based digital clock||
A "Vanity" LCD clock that displays the current time and -your- callsign, using a 16F84A PIC Microcontroller
Converting an AWA RT85 LOW BAND Transceiver to 6 Metres
Information about modifying a Phillips FM900 for Amateur use
Circuit diagram and PCB layout for Tait Electronics TA-500 CTCSS Encoder
An attenuator suitable for foxhunting and other equipment testing