The transmitter Hemmingen is a transmission facility for mediumwave (frequency 828kHz), FM an TV run by the Northern German Broadcasting Corporation (NDR). It uses as aerial mast two guyed steel framework masts, which are 125 metre and 118 metre high. The 125 metre high mast is grounded and carries on its top aerials for FM and TV transmission. Besides this, there is a long wire aerial for medium wave mounted on the mast, which is the backup medium wave aerial. The 118 metre high mast is insulated against ground. It is the main aerial or mediumwave. Besides this it carries FM and TV aerials on its top. These aerials are the backup aerials for the installation on the 125 metre mast.
Method of compatibly increasing the resolution in a color television system employing offset modulation at the transmitter and offset demodulation at the receiver and transmitting a reference signal during the vertical blanking interval.
Method as defined in claim 3 wherein the frequency of the second component is equal to the difference between the highest frequency of the signal portion providing increased resolution and the frequency of the first component.
Thus there is phase synchronism between the offset modulation at the transmitter and the offset demodulation at the receiver.
Feeds |
Contact