Basic Crystal Radio Set

Single Tank Circuit with Germanium Diode Variable Capacitor and a Crystal Earpiece

this is not about performance, its the very basic crystal radio circuit and it's one of

the very first steps of our beloved Amateur Radio Hobby.

in my location (Athens - Greece) using a 10 meter vertical wire antenna and the mains

ground I'm able to listen 3 - 4 MW stations during daylight, 729khz ERT local broadcast

and 2 - 3 more local MW pirate stations

during the night the received stations could reach or exceed the number of 10

including distant stations from Hungary,Romania and some Arabic spoken and others.

if you haven't any experience with crystal radio till now please know,

this works without battery or any external power source, it only needs the RF power

coming from the antenna so good - long external antenna i very important

also since there is no amplifier the audio is not loud but it's audible

normal modern headphones will not work.

there are 3 contact antenna terminals

one for ground connection (GND)

one antenna connection directly to the tank circuit (ANTENNA 1)

and one antenna connection through a 56pf capacitor (ANTENNA 2)

ANTENNA 2 connection gives lower sensitivity but it's used when your antenna

has a lot of self parasitic capacitance that can affect and reduce the upper

frequency end of the tank circuit.

detector diode is the very sensitive Russian germanium diode

D311 that usually measures 0.18V VF.

variable capacitor is 550pF

coil is fixed and wrapped externaly

a crystal earpiece is included

dimensions: 70mm diameter 45mm high

material: impregnated paper, plastic

you get what you see in the first picture.

Registered - Traceable Post Shippings

Ask for combined shippings if you also purchase any of my other items