Magnum MD 105R Instruction Manual download pdf (Page 13)

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RECEPTION TECHNIQUES

Antenna Cabling:

The lead-in cable from the antenna is often the weakest link in the FM system.

Some time spent on selection and matching will yield dramatic results when it

comes to noise reduction in weak signals.

A good grade of 75 ohm coaxial cable will provide very sufficient signal passage,

along with effective shielding against interference. Without effective shielding your

coaxial cable can in fact become an antenna in itself. There are different grades

of 75 ohm cable, there is RG59/U (Suitable for 50 feet and less) and RG 6. RG

6 is the better of the two and should be used in runs of 50 feet or more. The RG

6 has quad shielding and 50 % less losses than RG 59/U.

The key to maximizing the efficiency of the system is insuring that all connections

are clean and tight, silicon grease on outdoor connections will insure good

performance over a long period of time. If you splice either cable, make sure that

exactly the same type of cable is used.

Types of Antennas:

Multi-element Yagi - This is a unidirectional antenna capable of pulling in very

distant stations due to its high gain, the higher the gain the better. These types of

antennas are very directional and should be used with a rotor to get the

maximum benefit of the antenna. The directional feature helps eliminate multi-path

problems by allowing only the signal from the direction that the antenna is facing

to be picked up by the antenna and not the signals that come from a different

direction.

Magnum Dynalab offers two Yagi antennae, the MD 6 FM or MD 10 FM

Vertical ½ Wave - This design offers ease of installation and operation. This type

of antenna is omni-directional, which means that it picks up stations coming from

all directions. No rotor is required to pull in stations from behind or the side. This

design also gathers more of the FM signal from the air, offering superior fidelity

over that of a standard bi-directional antenna. It also gives 2.5 dB gain to the

signal strength over that of a standard dipole.

If multi-path is a reception problem try laying the antenna down in the horizontal

plane rather than the vertical plane. This type of antenna can be used indoors or

outdoors, but regardless of whether it is installed indoors or outdoors the higher

that you can put it the better it will perform.

Magnum Dynalab offers the MD ST-2, an excellent vertical ½ wave antenna

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Magnum MD 105R Instruction Manual Page 13