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Τετάρτη 9 Νοεμβρίου 2011

Συχνότητες QRP

Picture of crystals
QRP clubs around the world have agreed (with some local variations) for the following frequencies to be centres of CW QRP activity:
160m: 1.815 MHz 80m: 3.560 MHz (US 3.540 MHz, Australia 3.530 MHz)
40m: 7.028 MHz
30m: 10.106 MHz
20m: 14.060 MHz
15m: 21.060 MHz
10m: 28.060 MHz
In Australia the majority of QRP activity takes place away from these frequencies, for two reasons. The first is that QRP operators are a minority and the vast bulk of contacts made will be made throughout the band with stations running 100 watts. Secondly most Australian QRPers use the 'search and pounce' technique to get contacts (answering calls and 'tail-ending') as this is more effective than calling CQ if your signal is weak. Hence these frequencies are not widely used, except during QRP contests, such as the annual QRP Day and various scrambles throughout the year. 
However it's worth knowing them if two-way QRP contacts with DX stations are desired.  14.060 MHz is particularly popular overseas when conditions are favourable. Also homebrew QRP activity may occasionally be found on 1.843 MHz and 3.580 MHz due to the easy availability of crystals for these frequencies.
When tuning around the higher HF bands, it is worthwhile to listen for the International Beacon Project beacons. These operate on 20, 17, 15, 12 and 10 metres and are located around the world.  IBP beacons are particularly useful for QRPers as their output power is varied over four steps – 100 watts, 10 watts, 1 watt, 0.1 watt.  It is often possible to hear the 1 watt transmissions, and sometimes even the 0.1 watt signals.  IBP beacons operate on the following frequencies:
20m: 14.100 MHz
17m: 18.110 MHz
15m: 21.150 MHz
12m: 24.930 MHz
10m: 28.200 MHz

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