> Subject: [HCDX] 12110 harmonic of Jordan Radio 11810/11960 > > JORDAN 12110hx Came across of Arabic nx of Jordan Radio at 0600 UT on Fri > Apr 8th. This a mixture signal of 11810/11960 kHz, latter closes usually > around 0813 UT [though registered 0500-0715 UT], AKA 500kW 350degr towards > Western Europe. > > But NOT heard on symmetrical 11660 kHz, 150 kHz away. > NOT KWT hx 2x6055 kHz. (73 wb, wwdxc BC-DX Apr 8)
The effect in which two signals of nearby frequency, such as 11810 and 11960 combine to produce additional signals such as 12110, is not a harmonic. This is called a "mixing product". It is often caused by conditions outside of the transmitting station. A "harmonic" is caused by a badly tuned transmitter, usually in combination with a reasonably broad-band antenna. A harmonic on 12000 kHz would be a signal from a transmitter intending to transmit on 6000 (the most common example, 2x) or other sub-multiples of the signal one is hearing. This effect can often be noted on several multiples of the original signal, such as MW signals being heard (by harmonic) as high as 15 MHz, always at an exact multiple of the intended xmtr frequency. There has been disagreement as to whether a station at 6000, producing a signal at 12000, is radiating a "first" or "second" harmonic on 12000. This is a question of language usage. Hope this is of interest, regards, Bob ---[Start Commercial]--------------------- World Radio TV Handbook 2005 is coming out. Preorder yours and support open communications for DXers: http://www.amazon.com/exec/obidos/ASIN/0823077942/hardcoredxcom ---[End Commercial]----------------------- ________________________________________ Hard-Core-DX mailing list Hard-Core-DX@hard-core-dx.com http://dallas.hard-core-dx.com/mailman/listinfo/hard-core-dx http://www.hard-core-dx.com/ _______________________________________________ THE INFORMATION IN THIS ARTICLE IS FREE. It may be copied, distributed and/or modified under the conditions set down in the Design Science License published by Michael Stutz at http://dsl.org/copyleft/dsl.txt