Friday 23 December 2016

BASIC Tech Group - MyNews 11 - Final BPF, QRP_RIG & RF METER PCBs

Well I've taken the plunge, or in other words ordered my Christmas present! I have ordered the PCBs for three of my projects. Yes three!

The BPF-Basic - note: this abandoned as doesn't work...

This is a set of three Band Pass Filters for 40, 30 & 20m bands. Intended for use both for the front end for the QRP_RIG TXRX, the DCRX Direct Conversion RX, or any other input/output that needs a BPF on one of the bands.

Screen Shot 2016 12 23 at 10 16 48

Screen Shot 2016 12 23 at 10 16 58

The QRP_RIG-Basic a single board TXRX

This has been on of my long term aims, to build a single board Arduino shield which is an SDR based TX and RX able to work over a wide band of frequencies - is it a broadband design, the working frequency is determined by the DDS input and BPF on the input/output.

Screen Shot 2016 12 23 at 10 17 27

Screen Shot 2016 12 23 at 10 17 43

An RF METER-Basic - schematic updated, see later blog

A sensitive RF Meter with RF output also from the DDS via a LPF and buffer amplifier

This is one of the most useful measurement tools for an amateur shack, able to measure RF inputs, to 50R impedance, from -60dBm to more than +20dBm. And an RF source at around 1-10mW programmable by the Arduino from 100kHz to 20MHz.

Screen Shot 2016 12 23 at 10 18 01

Screen Shot 2016 12 23 at 10 18 11

Let's hope these work first time as the PCB costs are going up as the UK Pound falls - they come from Eurocircuits in Belgium, one fo the few PCB makers that accept Eagle "BRD" file inputs.

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