Sun Switch Using 2N3055 and BD139 Transistor

2N3055 is Power Transistor and Amplifier Transistor for General Purpose and can act as Photo

Transistor by cutting the "hat cover" of this transistor. This photo transistor function of 2N3055 can be taking the advantage as switching function with transistor. This circuit using 2 transistor which is 2N3055 and BD139. If there is no sun light or the light is not enough for Transistor 2N3005 to deliver, so R1 will give current to TR2 BD139 ,and this transistor will turn on Lamp on the Output of Circuit.

If The Sun Light which flows to "hat cover" of TR1 2N3055 enough, TR1 will deliver and will grounded Base of TR2 BD139 and will Turn Off The Lamp.R2 and P1 will improve switching system of the Transistors and The Light of Lamp Intensity could be regulated by P1.

At the below figure is Stripboard or Veroboard for the circuit. This Veroboard using DIYLC software.

Parts Lists of Components :
Transistor TR1 2N3055
Transistor TR2 BD139
Resistor R1 4K7
Resistor R2 10K
Trimmer Resistor P1 1M
Lamp 9 V / 400 mA
Battery 12 V
Box for the Circuit

Build This Simple Half Wave Dipole Antenna for Digital TV band 470-800 MHZ

The half-wavelength dipole is a balanced antenna consisting of two radiators that are each a quarter-wavelength, making a total of a half-wavelength. The antenna is usually installed horizontally with respect to the earth’s surface, so it produces a horizontally polarized signal.
In its most common configuration , the dipole is supported at each end by rope and end insulators. The rope supports are tied to trees, buildings, masts, or some combination of such structures. Ads Link

The length of the antenna is a half-wavelength. Keep in mind that the physical length of the antenna, and the theoretical electrical length, are often different by about 5 percent. A free-space half-wavelength is found from :

L= ( 492 / F(MHz) ) ft

In a perfect antenna, that is self-supported many wavelengths away from any object,The Equation will yield the physical length. But in real antennas, the length calculated above is too long. The average physical length is shortened by up to about 5 percent because of the velocity factor of the wire and capacitive effects of the end insulators. A more nearly correct approximation (remember that word, it's important) of a half-wavelength antenna is

L= ( 468/ F(MHz) ) ft

where :

L is the length of a half-wavelength radiator, in feet
FMHz is the operating frequency, in megahertz

For example : Calculate the approximate physical length for a half-wavelength dipole
operating on a frequency of 7.25 MHz.

Solution:

L=( 468/F(MHz) ) ft
= 468/7.25 ft = 64.55 ft

or, restated another way:

L = 64 ft 6.6 in

It is unfortunate that a lot of people accept Equation above as a universal truth, a kind of immutable law of The Universe. Perhaps abetted by books and articles on antennas that fail to reveal the full story, too many people install dipoles without regard for reality.

We will design Dipole antenna for Digital TV reception , as We know in literature the band frequency for TV reception between 470 MHz - 800 MHz. for this band frequency, we can calculate the centre frequency. The centre frequency for this band is 635 MHz.

The design of antenna , for balance the power reception of this antenna, by calculating design in centre frequency .
As the formula :

L = 468 /F

So,

L = 468/635 feet

L = 0.737 feet , this is 1/2 Lambda for centre frequency band of Digital TV reception.

For Dipole antenna design , between 2 arms of dipole antenna should be 1/2 lambda, so one arm of dipole antenna will be 1/4 Lambda .

So the calculation will be :

L = 0.737 feet (1/2 lamda)

1/4 lambda of L = 1/2 X 0.737 = 0.3685 feet , convert to cm , will be :

1/4 Lambda , L = 0.3685 feet X 30.48 cm/feet = 11.23 cm

Shakespeare 3020 Sea Watch Marine TV Antennas

Introducing the friendly, durable Marine TV antenna that makes it easy to bring broadcast television channels to your boat, whether you are at the dock or out on the water.

Marine Sea Watch 3020

This HD-ready, internally amplified antenna is omnidirectional - 360º signal reception, so no aiming needed. The SeaWatch® 3020 Marine TZ Antenna's sleek new design features a UV stabel, plastic housing. Its innovative new swivel mount accommodates mounting surfaces that slope up to 30 degrees. It also mounts easily on any standard 1"-14 thread antenna mount. THe antenna's digital preamplifier, located in the antenna head, has a great new design for high gain and low noise figures. It's HD Ready ... of course. Simply connect the antenna to any TV that has a digital receiver. With older analog TVs, use a digital converter box (not supplied). The Style 3020's wall-mounted 12-volt DC power supply has both front and rear outputs. For cable, satellite and playback devices, its Auxiliary Input automatically switches from Antenna input to Auxiliary Input when powered off. For a streamlined appearance, the coax running to the antenna head can be concealed by running it through the mounting base.

360º signal reception - no aiming
Compact, attractive aerodynamics design
Mounting bracket adapts to 0-30º sloped surfaces
Also mounts to standard 1"-14 thread devices
Operates on 12 volts DC
Power supply can be wall or surface mounted
Durable UV-stable plastic housing
Automatically switches to Aux Input when powered off

Dimensions: 14.88" Diameter x 7.25" Height

Unit Weight: 2.7 lbs

TV Signal Strength Meter

Winegard RFL-332 SensarPro Black TV Signal Strength Meter, Raise the antenna, slowly rotate to find the highest signal strength, and watch TV! The SensarPro TV signal strength meter makes it easy to find your favorite shows.

Scan, Seek and Channel Modes

Winegard Signal Strength Antenna

Allows you to peak in signals prior to running a channel scan on your TV. Save time and watch your favorite shows in the absolute best signal quality possible.

More Signal, Less Signal, No Problem

The SensarPro contains an adjustable amplifier to easily increase or decrease the gain with a press of a button. Increase for hard to get channels or decrease for overloaded signals close to your location for perfect reception!

Easy Antenna Aiming

Winegard Signal Strength Antenna

The SensarPro's adjustable volume audio signal feedback, 100 point scale aiming system and U.S. specific signal focus makes your antenna easier to aim than ever before!

une in local programming fast and easy with the Winegard SensarPro signal strength meter. Basic operation is simple, just select foot scan foot mode and slowly rotate the Sensar antenna until the strongest signal strength is located then run a channel scan and you will be watching your favorite local broadcast shows in standard or crisp clear HD. Advanced search options are also available but not necessary for each use. The SensarPro has built in amplification to provide up to 10 decibel of gain for increased performance or the ability to lower the gain when positioned near a tower. Also handy is the adjustable audio feedback to help lock in signal when the wall plate is out of sight or reach. The SensarPro works with all Winegard Sensar antennas and replaces the existing power supply. Proudly designed, tested and built in the USA by the makers of the first RV television antenna. White.

Winegard The Ultimate TV Antenna for RVs

Winegard Sensar Antenna

Optimized for all digital channels in all markets, Winegard Sensar antennas have been the leader in RV antennas for over 30 years! The increased range and VHF capabilities of the Sensar allow you to watch your favorite shows in the lowest signal areas.

Winegard Sensar antennas have unsurpassed range, allowing you to watch channels broadcast from up to 55 miles away. The built in amplifier boosts weaker television signals giving you crystal clear reception!

Winegard Sensar Antenna for RV

Powder coated for long lasting durability with over 20 years of experience on RV roofs. Sensar antennas have passed rigorous UV and environmental testing.

Excels at UHF and receives hard to get VHF digital channels. Optimized for digital HD reception, Sensar antennas can be raised, lowered and rotated from inside your parked RV to pinpoint the exact angle for best reception!

Winegard Sensar Antenna for RV

Tech Specs

Color, Size & Weight

Color Options: White, Black
Unit Weight: 6.5 lbs
Width: 46.25″
Depth: 15.25″
Height: 4″ Stowed, 30″ Raised
Powder coated for long lasting durability in harsh environmental conditions

Programming & Usage

Receives ALL VHF and UHF digital and HD signals
Amplified 75 ohm over-the-air digital and HD ready antenna

In The Box

Amplified Sensar Antenna and Lift Assembly
+12 VDC White Power Supply
White Interior Control Parts,
20’ 75 ohm Coax Cable
6’ 75 ohm Coax Cable
Mounting Hardware
Printed Documentation

Warranty & Support

Warranty: 2 Years Parts, 1 Year Labor
Complimentary Telephone and Email Support
Online Technical Manuals and Instructions
Large Dealer Support Network

Please read further detail for customer reviews here