Roger As Lee KX4TT stated, a harmonic on 1818kHz is a problem for us in southeast England in the vicinity of the Brookmans Park transmitter for Radio 5 on 909kHz. 73 John G3XHZ
Sent from my iPhone > On 13 Nov 2018, at 13:24, Roger Kennedy <[email protected]> wrote: > > > I have never received ANY harmonics or intermod products from any of our > British Medium Wave (AM) broadcast stations. That's at several different > QTHs, some of which were quite near the transmitters. (and never heard of > anyone else having issues) > > They have to meet VERY high specs . . . but also, most are less than 1kW ! > (one of the stations I worked for had such a good Tx site - a salt marsh - > they had to turn the power down to 150 watts!) Even the very big ones are > usually only 10kW. > > So no need to avoid the 9kHz harmonics as far as us Brits are concerned! > > What IS a problem is all the Russian Navigation Beacons in the Baltic that > pretty much wipe out everything between 1810 and 1820 kHz, so please try and > avoid that part of the band if you want to work any EU ! (they sometimes > turn them all off . . . but they are on most of the time.) > > The pre-amp I use on my 6ft 160m receiving loop is actually the design MFJ > use in their 1026 noise canceller (I have a 1025 but copied their preamp > design, as it uses the same pcb) . . . I get no intermod during contests, > even though many EU stations are 45dB over S9 ! > > Roger G3YRO > _________________ > Searchable Archives: http://www.contesting.com/_topband - Topband Reflector _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
