The Best Homebrew vertical antenna 40m band from YC2YIZ

Homebrew vertical antenna 40m band - To determine how much tubing we will need, we have to figure out how long a quarter wave is at forty meters . Using λ/4 (feet) = 246/f (MHz) and then converting the fraction of a foot which remains to inches, we get λ/4 = 33,10 inches for a center frequency of 7,265 MHz. Any center frequency can be chosen by placing that frequency in place of f in the formula.

This homebrew vertical antenna 40m band from Edy Karsono (YC2YIZ) , this antenna also work for 15m band, beside 40m band. Edy used MFJ analyzer to measure the SWR. 

AM Longwave and Shortwave PC Radio

This circuit is Radio with 1 Transistor you can get supply for PC and listening from PC Speaker.

Source Elektor Electronic

World Band Radio Antenna

• *The AN-LP1 is not recommended for use with Sony models ICF-SW10, ICF-SW11, ICF-SW77.
• *The AN-LP1 derives power from the radio when connected to Sony models ICF-SW1000T and ICF-SW7600G.

The Sony AN-LP1 portable active antenna is just right for travelers who wants maximum performance from their world band radio. The flexible folding loop antenna is 19 inches (48 cm) when open, but folds down with a twist to a mere 7 inches (18 cm) and neatly fits in the supplied soft carrying case. A mounting clip and suction cup on the end of the loop allows easy placement in a variety of situations. The suction cup is especially useful for mounting the antenna to a window where reception will often be the best. A reselection knob selects operation from 3.85-21.95 MHz. The AN-LP1 requires two AA cells for about 40 hours of use. The supplied cable connecting the loop to the ANl-LP1 control box is 12 feet long. The supplied cable connecting the control box to the radio is 8 inches long. Output is to a 3.5 mm mini plug. Comes with an English, French, German and Japanese instructions from Sony. Item is made in Japan.

AM FM Radio Kit, Good for Educational

This Kit AM FM Radio, good for educational purposed for building AM FM Radio and for knowing more AM FM radio receiver . 

This Kit come with books as a guide for study more about the AM FM circuit, start from Audio Amplifier, AM Detector, AM IF, AM Amplifier, AM Mixer & Oscillator, FM Detector, 1st FM IF, 2nd FM IF, and FM RF Stages. Superheterodyne receiver of standard AM and FM broadcast frequencies.

 

• AM/FM Radio Kit (Combo IC & Transistor)
• Includes 64 page educational training guide
• with multiple choice questions and answers
• Training course of 56 pages is divided into 9 lessons: Audio Amplifier, AM Detector, AM IF, AM Amplifier, AM Mixer & Oscillator, FM Detector, 1st FM IF, 2nd FM IF, and FM RF Stages. Superheterodyne receiver of standard AM and FM broadcast frequencies. Makes an excellent classroom project. Requires 9V battery, not included.

FM Radio Kit with Auto Scan Frequency

This Kit FM Radio Using IC as FM Tuner and IC for Amplifier. This FM Radio Kit scan FM frequency in 88-108 MHz and using auto scan  for scans up and for reset.

• Build this kit to assemble a monophonic FM receiver (88-108mhz) with electronic auto-scan
• Will help you understand the basics of working with printed circuit boards
• Become familiar with a variety of electronic components
• Develop good soldering skills
• For 30 years Elenco has been using their strong engineering and design skills to develop reliable, affordable electronic test equipment, tools, and educational kits
  This kit is a monophonic FM (frequency modulation) receiver designed to receive FM signals in the frequency range (88-108mhz) it uses electronic auto-scan to search for FM stations. This scan system is done with two button switches-one switch scans up, the other resets to the start of the tuning position.
  

Radio Crystal With One Transistor 2SB178

This Circuit is simple with One NPN Transistor 2SB178, Signal

 selected from LC circuit and pick up with Germanium

 Diode IN34A or IN60 or OA70 and Amplified with Transistor 2SB178 and with Earphone or Headphone with Resistant about 8-2000 Ohm.

The component list

COMPONENT '60 Turns' = L
COMPONENT '500 pF' = CV
COMPONENT 'IN34A/IN60/OA70' = D
COMPONENT '10 nF' = C
COMPONENT '5K6' = R
COMPONENT '2SB178' = TN
COMPONENT '4K7' = R
COMPONENT 'Earphone 8 - 2000 Ohm' = SPKR
COMPONENT '100uF' = CE
COMPONENT 'SWITCH' = SWITCH
COMPONENT '1.5V' = BATTERY
COMPONENT '' = GND

VLF and ELF Experiment Using Cable TV Antenna

This is simple experiment using Cable TV Antenna , Diode Germanium IN60 and Spectrum Lab Software free download.

Install Spectrum Lab on your computer and connect The Antenna to Diode Germanium IN60 and connect it to your PC/Laptop Micrphone Input. Connect The Ground and Antenna cable to Ground of Microphone Input and you will here some of Local Radio about ....km or ..miles with some noise background.

Warning : Do not try this in the Rainy Days with Lightning come up, It can harms you

The result are :