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Τετάρτη 9 Νοεμβρίου 2011

Τι μπορούμε να κάνουμε με QRP

Photo of microphone
The following are examples of what QRP can do:
600km spanned with 2 watts DSB and Australia to US with 5 watts CW on 160 metres.
VK3 to ZL with 5 watts SSB with a 1.5m indoor magnetic loop antenna on 80 metres.
Australia to US with 5 watts on 40 metres with a simple wire antenna.
Newcastle (VK2) to Nauru Island on 40 metres with 1 watt CW to quarter wavelength wire antenna.
Pedestrian mobile VK1 to VK7 with 4 watts AM on 28 MHz.
Australia to Japan with 500 milliwatts CW on 6 metres (antenna G5RV, SWR unknown!).
Regular 144 MHz SSB Sydney to Canberra contacts with 2.5 watts to a 2 el yagi (operating portable)
Of course some of these require good locations, favourable conditions and/or other stations with good antennas and low noise levels.
Even without these advantages 'full-time' QRP can be quite satisfying and provide many comfortable contacts. Routine contacts with QRP to simple antennas are quite achieveable up to distance of about 500km on 80 metres, 1000 kilometres on 40 metres and 3000 kilometres on 20 metres (subject to conditions). This applies to a range of modes such as SSB, SSTV, PSK31 and CW. On VHF/UHF QRP SSB to a small yagi will reach 100 - 150km or more, with even better results with weak-signal digital modes.

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