Crystal Radio Receiver High Q Litz-Coil 3 Diode Selectable and Piezo Earphone

Description

Crystal Radio Receiver High Q Litz Wire Coil- 3 Diode Select and Piezo Earphone
Fully Assembled Crystal Radio Receiver
(Antenna and Ground Wire are not Included)
Knob designs may vary from picture, but are always improved equivalents
Crystal Radio is a great fun for both beginners and expert
enthusiasts
alike
3 Diodes that are Jumper Selectable
Includes Piezo Earphone
This Model is designed with a High "Q" Litz Wire 680uh Air Core Coil
It will Outperform all
equivalent
680uh Litz Wire Coils with a Ferrite Rod
This Crystal Radio Design DOES NOT have a ferrite rod and here's why..
This Coil is designed with a High 680uh Litz coil without using a ferrite rod
Ferrite Rods can Reduce Coil
Efficiency
My Tests in AM Radio Crystal Radio Applications Show that "Q" losses in FERRITE ROD antennas are much higher than accepted theory.  When a ferrite rod is introduced into a coil its inductance increases considerably, but it also reduces the Quality Factor of the Coil ("Q").
Radio measures
3-3/8″ X 5-1/8″ and is great for beginners, Survivalists or Advanced Enthusiasts
Features:
1)
Large Size Professionally Manufactured Printed Circuit Board
Size Circuit Board (3-3/8″ X 5-1/8″)
2) Integral Audio Jack for earphone or connect your own earphone or headset to the metal post screws next to where it says earphone
3) The instructions for getting the Schematic, Operation and Troubleshooting files electronically by email will be included with the radio when you receive the kit in the mail
4) Switch enabled a 470uh inductor-NEW Design allows you to change the main Coil total inductance with the press of a switch. Press the latching pushbutton to reduce inductance by as much as 50%, press again for full inductance. The inductance is locked/latched and will hold until you press the pushbutton again
5) Non Skid Feet and easy to connect Antenna and Ground terminals using the included Alligator clips.
6) Air Core Litz Wire Loopstick Antenna Coil
7) Piezo Earphone included
8) Alligator Clips included to connect to your Antenna and Ground (Antenna and Ground Wire are not included)
9) High performance Crystal Radio
10) Included Earphone can be easily connected by using the installed jack or solder your earphone to the solder pads or by connecting to the screw posts
Selectable from 3 Diodes that Can be selected Individually
Selectable Diode feature lets you test and compare the signal quality or Audio Level for up to three user selectable diodes  by simply moving the included jumper to positions 1, 2, or 3 as marked on the PC Board
Select from any of the 3 Germanium Diode's- D311 (Black), BAT85 Schottky (Smallest Diode), European 1N34A (Red Band)-Not all the diodes will perform equally depending on the signal strength in your area.
Simply Connect the Included Earphone and attach and your own Antenna and Ground Wire and it is ready to use.
(Antenna and Ground Wire Not included)
A minimum of a
30-50ft long outdoor Antenna Wire is recommended.
The best configuration for a crystal radio antenna is to run the wire horizontally between two electrically insulated supports as high off the ground as you can get them
.
The reason you need a good length antenna is because the more antenna you have, the more power your set will receive, and the louder it will be.
If you live in a Fringe Location where AM Radio signals are poor or weak and you dont have room on your property for a 100 Foot long antenna, check out my eBay store for my
"
AM Medium Wave Crystal Radio Antenna RF Amplifier High Performance".
This amplifier Pulls in AM Radio signals like a Magnet.
Here is the link to my eBay store:
https://www.ebay.com/str/hometownsales11