Search Results for: Top band

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A grandfather and grandson team build – the Fischer uBITx

This transceiver was built by Bob (WB8BEL) and his grandson Blake Fischer in 2018.  The “version 3” board and bag of parts were purchased directly from HF Signals. Construction & Modification Notes: Together Bob and his grandson fabricated the chassis by cutting, then soldering together, five individual panels of 0.070-inch-thick, double-clad printed circuit board material …

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Latest release of the TFT Colour Touch Control from VU2SPF and VE1BWV

VU2SPF and Joe VE1BWV have released the latest version of their TFT Colour Touch Control. PROJECT HIGHLIGHTS Low cost, standard easy to get parts, Colour, Touch Control and any combination of Touch Control or physical buttons. TFT (Touch) Display module, Atmega 2650, Si5351 DDS, 1 UBITX and a few wires = All Band rig with …

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Spurs found in uBITx that present issues for operation above 18 MHz

Alison KB1GMX has been exploring ways to flatten the TX output across bands over the last couple of weeks, but  says, “Here is the problem…  Improving the amp leads to acknowledging other issues.   In particular … the spurs!” When transmitting on 15m and 10m the LPF has a cutoff frequency over 30 MHz, so effectively the …

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New Release of KD8CEC Firmware v1.08

Ian KD8CEC has formally released version  1.08  of his firmware. This the first major release since 1.061, although there have been a number of Beta versions in between that many constructors will have donwloaded. Some  key features in this version include: 1.Receive performance is improved compared to the original firmware or version 1.061 2.ATT function has …

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What makes a good receiver? And what about the uBITx

Somebody on the list asked how the µBITx  receiver performs compared to other transceivers.  Allison KB1GMX provides an extensive commentary on  factors that relate to receiver performance with the µBITx as a reference point that will be of interest to constructors. She notes that receiver performance has many dimensions: Sensitivity Bandwidth Overload performance and dynamic range. …

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Off the deep end …

Dennis KG4RUL has gone off the deep end with his µBITX.  His current configuration, basically a rats nest on the bench, comprises: Main CPU (Teensy 3.5) – handling the SI5351 control (I2C), the 20×4 LCD Display (I2c), input from the front panel controller (I2C), control of an AF DSP (I2C), control of a CW Keyer …

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