SUPERGAIN DVB-T 12 V Input Switch

Replacement 12 Volt input switch V9114PI for the SUPERGAIN DVB-T antennas BALLADE and NOMADE .
SUPERGAIN DVB-T antennas * are equipped with an active amplifier directly in the antenna housing. The power supply of this amplifier is from the 12 volt DC electrical system and is guided by means of the feeder via the coax cable to the antenna. At the same time, the feed path decouples the received and amplified TV radio frequency signal from the DC voltage.
* and some antennas of other manufacturers (GLOMEX, NARGUS, etc.)


Details

• Frequency range: 40 - 2000 MHz
• Operating voltage: 12 V DC (vehicle electrical system)
• Dimensions (L x W x H): approx. 70 x 45 x 17 mm
• connections
  • F jack ANTENNA IN
  • F jack TV OUT
  • 12 V DC - two single wires, length approx. 25 cm
    RED = PLUS 12 V (including flying fuse),
    BLACK = MINUS
  • Grounding terminal on the housing (maximum cable cross-section 10 mm²)
• Fuse: 250 mA, 5 x 20 mm
• Fastening possibility: a 4 mm bore

Hints and background knowledge

• Disconnect the operating voltage from the feed switch before working on the coaxial cable between the antenna and the feed switch!
  Frequently, work is done on the connections of the coax cable without the 12 Volt operating voltage having been disconnected from the feed gap before. This can cause unnoticed short circuits, which can blow the 250 mA miniature fuse. In the worst case, further components within the feed gap burn *.
• Do not turn the screw of the DC connection wires!
  When turning the screw connection, the two connection wires may also be entangled with each other (danger of short circuit) or torn off the circuit board *.
  * These damages are irreparable, the feed switch must then be replaced.
• The feed-in decouples DC voltages, which come either from the 12 volt electrical system or as 5 volts from the receiver / TV.
  Many DVB-T receivers or TVs provide a 5 volt DC operating voltage at the antenna connector socket to power an active 5 volt DVB-T antenna . Often, these 5 volts can be turned on or off in the basic settings.
  Due to the DC decoupling no change of settings on the receiver / TV is necessary.

Why an antenna with integrated amplifier?
The advantage of the integrated amplifier is that weak antenna signals are already amplified directly in the antenna and can then be made available to the receiver / TV in a sufficiently high level.
If the amplifier is outside the antenna, weak signals could be additionally attenuated by line and line losses. If you then amplified these signals, the receiver / TV could no longer reliably separate the wanted signal from the noise (interfering frequencies), which would lead to picture and sound disturbances or to complete loss of reception.

Why a power supply via the coax cable?
Of course, an amplifier requires an operating voltage. Since it is possible to simultaneously carry the high-frequency antenna signal and a DC voltage on the coaxial cable, it saves the laying of an additional line for the operating voltage.
On board the unit is positioned in the area of ​​the receiver / TV, as both are required: 12 Volt DC and the antenna signal.