\Weird Al\" Yankovic" UHF
what is UHF?
What is UHF by Weird Al Yankovic?
In 1989, Yankovic starred in a full-length feature film, co-written by himself and manager Jay Levey, and filmed in Tulsa, Oklahoma called UHF. A satire of the television and film industries, also starring Michael Richards, Fran Drescher, and Victoria Jackson, it brought floundering studio Orion their highest test scores since the movie RoboCop. However, it was unsuccessful in theaters due to both poor critical reception and competition from other summer blockbusters at the time such as Indiana Jones and the Last Crusade, Lethal Weapon 2, Batman and Licence to Kill. The failure of the film left Yankovic in a three-year slump, which was later broken by his inspiration to compose "Smells Like Nirvana". The film has since become a cult classic, with out-of-print copies of the VHS version selling for up to $100 on eBay until the release of the DVD in 2002. Yankovic occasionally shows clips from the film at his concerts (to which MGM, the film's current owner, initially objected in the form of a cease and desist letter). In an apparent attempt to make it more accessible to overseas audiences, where the term UHF is used less frequently to describe TV broadcasts, the film was titled The Vidiot From UHF in Australia and parts of Europe. UHF shows the creation of Yankovic's signature food--the Twinkie Wiener Sandwich. The snack consists of an overturned Twinkie split open as a makeshift bun, a hot dog, and Easy Cheese put together and dipped in milk before eating. Yankovic has stated that he has switched to using tofu hot dogs since becoming a vegetarian, but still enjoys the occasional Twinkie Wiener Sandwich. CANNOTANSWER
UHF is used less frequently to describe TV broadcasts,
The UHF connector is a name for a threaded RF connector. 
The connector design was invented in the 1930s for use in the radio industry, and is a shielded form of the "banana plug". It is a widely used standard connector for HF transmission lines on full-sized radio equipment, with BNC connectors predominating for smaller, hand-held equipment.

The name "UHF" is a source of confusion, since the name of the connectors did not change when the frequency ranges were renamed. The design was named during an era when "UHF" meant frequencies over 30 MHz. Today, Ultra high frequency (UHF) instead refers to frequencies between 300 MHz and 3 GHz and the range of frequencies formerly known as UHF is now called "VHF".

Unlike modern connector designs that replaced it, no active specification or standard exists to govern the mechanical and electrical characteristics of the so-called "UHF" connector system making it effectively a deprecated design with no guarantee for suitability to an electrical or mechanical purpose.. Evidence of inconsistency exists. Testing reveals post WWII connectors designs, such as N connector and BNC connector are electrically superior to the 'UHF' connector for modern UHF frequencies. Other testing reveals one UHF connector sample shows negligible effect on frequencies up to 435 MHz.

Other names
The connector reliably carries signals at frequencies up to 100 MHz.  The coupling shell has a  inch 24 tpi UNEF standard thread.
The most popular cable plug and corresponding chassis-mount socket carry the old Signal Corps nomenclatures PL-259 (plug) and SO-239 (socket).  These are also known as Navy type 49190 and 49194 respectively. A double-ended SO-239 connector is designated as an SO-238.

PL-259, SO-239, PL-258, and several other related military references refer to one specific mechanical design collectively known as the UHF Connector. In some countries, for example in Israel, the term 'PL connector' is confusingly associated rather with the analog phone connector. The designations come from the Joint Electronics Type Designation System, its predecessor AN system, and the earlier SCR (Set, Complete, Radio) system.

Characteristics

Mechanical
By design, all connectors in the UHF connector family mate using the  inch 24 tpi threaded shell for the shield connection and an approximately 0.156 inch-diameter (4 mm) pin and socket for the inner conductor. Similar connectors (M connectors) with an incompatible 16 mm diameter, 1 mm metric thread have been produced, but these are not standard UHF connectors by definition.

Surge impedance
UHF connectors have a non-constant surge impedance. For this reason, UHF connectors are generally usable through HF and the lower portion of what is now known as the VHF frequency range.
Despite the name, the UHF connector is rarely used in commercial applications for today's UHF frequencies, as the non-constant surge impedance creates measurable electrical signal reflections above 100 MHz.

Virtually all of the impedance bump and loss is in the UHF female. A typical SO-239 UHF female, properly hooded, has an impedance bump of about 35 ohms. The length of the bump is typically  inch, where the female pin flares to fit over the male pin. This bump can be mitigated by using a honeycomb dielectric in the female pin area. Many VHF/UHF amateur operators use special UHF females that maintain a 50 ohm surge impedance.

Power
Some samples of UHF connectors can handle RF peak power levels well over one kilowatt based on the voltage rating of 500 Volts peak. In practice, some UHF connector products will handle over 4 kV peak voltage. Manufacturers typically test UHF jumpers in the 3-5 kV range. UHF connectors are standard on HF amateur amplifiers rated at 1500+ Watts output.

In practice, voltage limit is set by the air gap between center and shield. The center pin diameter and contact area is large enough that pin heating is not an issue. UHF connectors are generally limited by cable heating rather than connector failure.

Environmental tolerance
The UHF connector is not weatherproof.

Applications
In many applications, UHF connectors were replaced by designs that have a more uniform surge impedance over the length of the connector, such as the N connector and the BNC connector. UHF connectors are still widely used in amateur radio, Citizens Band radio, and marine VHF radio applications.

See also
 Miniature UHF connector
 RF connector

Notes

References

RF connectors Mini-UHF connectors are miniaturized versions of UHF connectors, designed primarily for use in bag-type mobile phones and similar applications where size is an important consideration.  Introduced in the 1970s, Mini-UHF has a 3/8-24 thread size and operates up to 2.5 GHz. It is similar only in basic construction, a threaded outer portion, center pin, and toothed ends intended to prevent twisting and loosening. Its performance is much better than the standard UHF.

See also
 UHF connector

External links
 Description of Miniature UHF connector

References

RF connectors Heligoland radio tower is a  high transmission tower on the island of Heligoland in Germany. It is owned by the Deutsche Telekom. It was constructed in 2000, replacing an older, lower mast that was subsequently demolished, and has some unusual characteristics. It uses a triangular base and, despite being a free-standing tower, is supported by guy wires as well. A few months after its 2000 installation, local authorities sought the sale of municipal land on the Düne area of Heligoland island for private building and operational purposes.

Besides its use as a microwave radio relay station, it is used for transmitting radio and TV stations as well. It serves the entire island of Helgoland and is a major landmark on the island, and plays a major role in maintaining connections to the mainland. In addition, the collective of Heligoland radio tower and two other towers on the island retain a military air.

Channels
Analog radio:
NDR 1 Welle Nord - 88.9 MHz (10 W)
NDR 2 - 93.4 MHz (10 W)
NDR Kultur - 97.0 MHz (10 W)
NDR Info - 92.5 MHz (10 W)
N-Joy - 91.5 MHz (50 W)
Deutschlandfunk - 107.4 MHz (50 W)
Deutschlandradio Kultur - 103.0 MHz (50 W)
R.SH - 100.0 MHz (50 W)
delta radio - 104.5 MHz (50 W)
Radio NORA - 101.6 MHz (10 W)
Klassik Radio - 89.8 MHz (10 W)
Analog television (no longer on air):
VHF 6 - ARD (2 W)
UHF 21 - ZDF (30 W)
UHF 23 - n-tv (30 W)
UHF 28 - 3sat (30 W)
UHF 34 - Premiere (30 W)
UHF 41 - Sat.1 (30 W)
UHF 47 - RTL Television (30 W)
UHF 52 - VOX (30 W)
UHF 54 - NDR Fernsehen (30 W)
UHF 56 - DSF (30 W)
UHF 60 - Pro7 (30 W)
Digital television (DVB-T):
UHF 23 - ZDF bouquet (250 W)
UHF 39 - NDR bouquet (250 W)
UHF 47 - ARD bouquet (250 W)

References

Radio masts and towers in Germany
2000 establishments in Germany
Towers completed in 2000
Buildings and structures in Pinneberg (district)
radio tower