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How not to design transmitters and receivers (part 6: prescalers)
25/08/21
Part 5 of the series 'How not to design transmitters and receivers' discussed phase locked loops (PLL) and the fact that programmable dividers (divide by 'N') are required in order to make a PLL which can operate on different frequencies. Such a divider would need to be able to -
Bilsdale versus Eston Nab
19/08/21
Around a million people in the North East of England in areas from Sunderland to Whitby, including Hartlepool, Darlington and Middlesborough came home from work on 10 August to find that their Freeview TV, DAB radio and FM radio services had disappeared. This was caused by a fire at the Bilsdale ma -
Tropospheric vs Sporadic-E Propagation Loss
18/08/21
For some time, Wireless Waffle has published an FM DX Logbook. This logbook records any DX (distance) reception of FM broadcast stations that have been received, through whatever means (i.e. home FM tuner, car radio, software radio). Though an interesting exercise in itself, a recent update to the -
How not to design transmitters and receivers (part 5: phase locked loops)
12/08/21
Parts 1 to 4 of this series have covered generating an RF signal, amplifying it, and providing the whole kit and caboodle with a nice clean power supply. In this part, we consider frequency stabilisation.
It is very straightfoward to produce a radio frequency (RF) signal that does not dr -
How not to design transmitters and receivers (part 4: low drop-out regulators)
03/08/21
A quick diversion from RF design to consider, for a short while, the issue of voltage regulation. Voltage Controlled Oscillators (VCOs) need to be supplied with a well regulated and low noise power supply. The power for most equipment is either provided via a mains power supply (which can be full
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How not to design transmitters and receivers (part 6: prescalers)
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