Wednesday 25 September, 2013, 11:35 - Radio Randomness, Spectrum Management, Equipment Reviews
Posted by Administrator
In the past, Wireless Waffle has discussed various things that cause radio interference but which are not supposed to including, for example Power Line Telecommunications devices. This time around it's the turn of a Class T audio amplifier to come under the spotlight.Posted by Administrator
![topping tp20 spotlight](images/topping-tp20-spotlight.jpg)
Class T amplifiers are really Class D amplifiers but are supposedly more efficient. Any clearer? No, probably not. The idea behind these types of audio amplifiers (noting that the Class D principal is also used in some radio transmitters too) is that instead of amplifying an analogue signal in an analogue way, such that the output voltage is just an amplified version of the input voltage, they switch the output voltage on and off at a frequency higher than the audio signal, and then use a filter on the output to smooth the square wave that they produce back into a nice analogue signal. This method is known as pulse width modulation.
![pulse width modulation](images/pulse-width-modulation.jpg)
As with switch mode power supplies a good filter is critical in ensuring that none of the original square waves find their way to the output. Square waves are very good at producing harmonics and therefore are equally good at generating radio signals and, of course, radio interference. There have been many cases of switch mode power supplies causing such radio interference and their use in, for example, LED lighting, means that the number of possible sources of interference is ever increasing.
The main problem is that, in many cases, the device will work without the filter fitted - if (and only if) the device that it is powering is not too fussy about all those square waves (e.g. an LED) or has a method of smoothing them out itself (e.g. a loudspeaker). A loudspeaker is basically a large inductor, which is what the filters in switching amplifiers also comprise. Feeding the nasty square waves on the output of the switcher directly into a loudspeaker will not result in a noticeable loss in fidelity (assuming the switching frequency is well above the audible frequency range), nor any particular loss of efficiency. So why fit the filter? To stop radio interference, that's why.
![topping tp20 examination](images/topping-tp20-examination.jpg)
So step up to the examination table, the Topping TP20-MK2 Class T Digital Mini Amplifier
In cases such as these, there is little that can be done. Other than taking the device apart and replacing the filter components with better ones (an idea that is not as daft as it sounds), the solution is to junk the device and use a traditional linear amplifier instead. Which is what has been done. Bye bye trendy, offendy Topping, hello dusty, trusty Sony.
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Wednesday 4 September, 2013, 09:46 - Spectrum Management
Posted by Administrator
The new 700 MHz mobile band (703 - 748 paired with 758 - 803 MHz) is a hot topic amongst spectrum aficionados around the world. It raises a number of technical and political issues which are far from being fully resolved. On the political side, the main battle is between broadcasters (who currently occupy the band) and the mobile community who are keen to brush the broadcasters aside to clear the spectrum for more mobile broadband services. Broadcasters argue that they need more spectrum to cope with high definition and other developments whilst the mobile operators believe that the spectrum has greater value if used for extending broadband capacity and especially, given the good propagation characteristics at 700 MHz, the coverage, of their networks.Posted by Administrator
![unlit bonfire](images/unlit-bonfire.jpg)
Whilst it might seem that the likelihood of a low power (50 milliWatt) transmission from a mobile phone causing interference to reception of a high power (100 kiloWatt) television service is small given the vast (2 million times) difference in transmitter power, the reality is that the mobile handset could be within only a few metres of the television receiver whereas the television transmitter might be tens of kilometers away. The strength of interference from the handset could therefore be orders of magnitude higher than the incoming television signal. Using free space path loss:
- A 50 mW (23 dBm) mobile transmitter 3 metres away produces a field strength of 91 dBuV/m
- A 100 kW (80 dBm) television transmitter 30 kilometers away produces a field strength of 68 dBuV/m
![guard band girl](images/guard-band-girl.jpg)
- The quality of the television receiver. Those made to a low price may not perform as well in this regard as more expensive receivers.
- The quality of the receiver installation. An old antenna may receive less signal and poor coax will allow more mobile signal to leak into the receiver exacerbating the problems.
- The proximity of the mobile transmitter to the television antenna. In the case where television reception is through a 'rabbit ears' antenna on top of the TV, the distance between the antenna and the mobile could be far less than 3 metres, or even 1 metre.
- The distance of the receiver from the television transmitter. Those close to the transmitter are less likely to suffer interference but those in areas of fringe reception are at much greater risk.
- The use of television signal amplifiers. Such amplifiers can easily overload and stop working when presented with a strong nearby mobile signal.
The rules of spectrum use state that new users should implement their transmitters in such a way as to protect existing, incumbent users from interference and in that respect, the work to ensure that the new mobile services do not cause harmful interference to television services is totally appropriate. But there is another technical issue that needs to be considered, that of interference from the television transmitter into the mobile network.
Consider a mobile base station that is 1 kilometer away from the television transmitter, trying to receive a signal from a mobile handset that is 500 metres away. Let's run the free space path loss equations again:
- A 50 mW (23 dBm) mobile transmitter 500 metres away produces a field strength of 47 dBuV/m
- A 100 kW (80 dBm) television transmitter 1 kilometer away produces a field strength of 98 dBuV/m
![streichholzer](images/streichholzer.jpg)
Whilst it is possible to develop filters that can provide 50 dB, 60 dB or even more rejection of the television signals, they are costly. Of course not every site requires such an expensive filter: only those close to television transmitters on channel 48 will need them. But whilst television frequency use is not normally very dynamic, as re-planning of networks takes a lot of co-ordination, they do change channel from time-to-time and so knowing which site to fit the filters to cannot be done with complete certainty.
So if the political issues form tinder dry kindling just waiting to be lit, the problems of interference from mobile handsets into television receivers are a bucket of petrol poured on that kindling. It may therefore be that the problems of interference from television transmitters into the mobile network are the spark that gets the fire burning!
![midsummer bonfire](images/midsummer-bonfire.jpg)
Saturday 31 August, 2013, 15:07 - Spectrum Management
Posted by Administrator
Posted by Administrator
![sexy stewardess](images/sexy-stewardess.jpg)
The article claims that this occured because the 'church's wireless microphone and the plane's radio were on the same frequency'. Radio microphones in the UK operate in a variety of frequency bands. Most commonly they operated between 173.1 to 175 MHz and 863 to 865 MHz, both of which are available on a licence-exempt basis for such purposes. There are other frequencies available but these are subject to the need for a licence and are only normally used for professional programme making and special event (PMSE) uses. Most domestic and everyday business use (including local DJs, schools, hotels and churches) use the licence-exempt channels.
So how could the church's radio microphone be operating on the same frequency as an aircraft? If this is true, there are two possibilities:
- The systems on-board the aircraft used the same licence-exempt frequencies that the church's radio microphone used. Or
- The radio microphone system being used by the church was not on the officially sanctioned frequencies but was operating on frequencies reserved for aeronautical communications.
The CEPT has considered the use of short-range devices on board aircraft and it has concluded that, from the regulatory perspective, such use is allowed under the same conditions provided in the relevant Annex of Recommendation 70-03. For aviation safety aspects, the CEPT is not the right body to address this matter which remains the responsibility of aircraft manufacturers or aircraft owners who should consult with the relevant national or regional aviation bodies before the installation and use of such devices on board aircraft.
So it would not be illegal for an aircraft manufacturer to use licence-exempt wireless microphones on-board their planes. There is also increasing interest in using wireless technology to control the actual flight of the aircraft (the ailerons, flap, engines and so on). Planes using 'fly-by-wireless' technology have already been tested and there are now moves to try and find dedicated spectrum for them to operate in. This negates the need for the usual wiring that is required and saves weight which in turn saves fuel and cost.
![illegal radio microphone](images/illegal-radio-microphone.jpg)
So it seems that it was probably the use of licence-excempt frequencies for short-range audio communications on-board the aircraft that was the culprit. It's worth considering that interference is usually bi-directional, especially where the systems are using similar powers and modulation. So it is just as likely that passengers on-board the aircraft could have been subject to the eulogy being given from the church as vice versa.
Which opens up a completely legal but very naughty set of ruses that anyone with suitable equipment could carry out if particularly bored on, say, a Sunday afternoon. Just stand near the end of the runway at an airport with a completely legal radio microphone operating, most likely, on the 863 to 865 MHz band and pick yourself a channel. As each aircraft comes overhead shout 'Brace, brace, brace' and if the aircraft's on-board wireless audio system happens to be on the same channel as your microphone the passengers are going to go ape. Of course, Wireless Waffle would never condone such activity, but if aircraft manufacturers are going to use licence-exempt frequencies, which are subject to no protection from interference, for on-board communications they are opening themselves up to all manner of prankery. If they choose to use bluetooth to actually control the aircraft itself, heavens only knows what might happen. Perhaps it would be best to stick to using wires or even optic fibre for controlling aircraft.
![shouting at aircraft](images/shouting-at-aircraft.jpg)
Tuesday 7 May, 2013, 08:14 - Spectrum Management
Posted by Administrator
Posted by Administrator
![brass in pocket](images/brass-in-pocket.jpg)
The fact that spectrum could remain unsold had been predicted by some, as a result of having set the reserve price too high. So just how does the price paid in the Australian auction compare to that paid elsewhere? The table below sets out the prices paid for 800 MHz spectrum in Germany, France, Italy and the UK and compares this to the price paid for 700 MHz spectrum in Australia. The comparison made is on a 'price per MHz per population' basis and for fun, GDP (PPP) has been factored in to see whether this makes any odds. Prices are all converted to Euro.
Country | Band | Euro per MHz per pop | Euro per MHz per pop (GDP adjusted) |
---|---|---|---|
Germany | 800 MHz | 0.73 | 0.68 |
France | 800 MHz | 0.69 | 0.71 |
Italy | 800 MHz | 0.83 | 0.98 |
United Kingdom | 800 MHz | 0.51 | 0.52 |
Australia | 700 MHz | 1.06 | 0.92 |
What does this tell us? Other than the fact that it demonstrates an ability of Wireless Waffle to do some simple maths, it shows that the price paid per MHz per person in Australia was almost 40% higher than the average of all these countries put together. Similarly, when scaled for GDP, the price paid is still 20% over the odds. The only more expensive spectrum was that sold in Italy and this is only because Italy's GDP per capita is somewhat smaller.
So why would operators down under be willing to shell out more moolah for spectrum than elsewhere? Perhaps the secret lies in the rapid population growth taking place. Just a few days ago, it was predicted that the Australian population had reached 23 million. But more importantly, the population is predicted to rise to 40 million in around 40 years time representing growth of around 1.5% per year. This is much faster than the population growth in other countries and means that in just 10 years time, the population of Australia will be 15% larger. If you do the price per person calculation now, the €1.06 becomes €0.92 and the €0.92 becomes €0.80. This puts the prices on a GDP adjusted basis just 5% ahead of average. In 15 years time the prices would be 5% below average. So over the life of the licence maybe these prices are not too high. Of course the population of other countries is growing too, and this would have to be factored in to any more detailed comparisons (such as a competent economist might make).
![banana vs births](images/banana-vs-births.jpg)
There are statistics to show that the number of bananas imported into the UK is closely correlated with the growth in population (as the above graph clearly demonstrates). It therefore follows, using Spock-strength logic, that there is a connection between bananas and the price differentials paid at auction for spectrum. Australia grows lots of bananas and it's population is rising, and lots was paid at auction. Q.E.D. as they used to say in ancient Rome.
What does this prove? Nothing at all, but having called the European Commission 'nuts' last month, the time was right to make another foodstuff related comment about a regulator somewhere or other. And so it seems (as so obviously can be deduced) ACMA is clearly bananas!
![big banana](images/big-banana.jpg)