I have been toying with the idea of making a Si5351A breakout board ever since I saw the chip details on Silicon labs web site. It seems SI5351A is an ideal choice for Variable Frequency Oscillator (VFO) for a homebrewed radio. The SI5351 is an i2c programmable any frequency clock generator. The chip can generates… Continue reading A simple Si5351A breakout board
I have been trying to program cheap Chinese DDS modules recently. I wanted to add a DDS VFO to one of my bitx rigs. These modules are available at $4.5 from aliexpress. They claim that it can work up to 40Mhz. I used an arduino Uno along with a rotary encoder for controlling the module. The… Continue reading Plug and Play DDS VFO with arduino
by R. Jayaraman (VU2JN) This note describes a compact Antenna Tuning Unit (ATU) that I assembled recently. It is capable of handling the full 100-watt output of my FT-840 transceiver. For efficient radiation of the RF power otput of a HF transmitter, its output impedance, the characteristic impedance of the transmission line (usually coaxial cable),… Continue reading A compact ATU handles 100 watts
I have been playing with the ISDR software defined radio from OM VU2DEV , Ramaprabhu ( from Bangalore )for the past one week. ISDR is a low cost SDR for 40m band. The radio is performing wonderfully. I bought 2 assembled kits from DEV and I recommend the kits to any one who wants to … Continue reading ISDR from VU2DEV
Here are photographs of my shack. I have built several equipments and circuits over the years. These pictures show the status of my shack as on September 2010. I took them last week on a Nikon CoolPix L21 .