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fm digital radio development board – Circuit Schematic
fm digital radio development board
They implemented it in the higher frequency L band 1452-1492 MHz whereas EU, AU and GB are in VHF Band III (174-230 MHz) anyway it failed for whatever reasons, ...
FM jammer – Circuit Schematic
FM jammer
I want to make an FM jammer so I can play whatever music I want through my school bus radio. (It`s legal where I live :3) Can someone help me with.....
mobile active antenna power circuit – Circuit Schematic
mobile active antenna power circuit
Hello, I am going to try some flat mobile active car atenna`s, with a Terratec Cinergy DT USB XS Diversity digital tuner. The antenna has the.....
RF Test Circuits – Circuit Schematic
RF Test Circuits
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Regency TR-1 Transistor Radio – Circuit Schematic
Regency TR-1 Transistor Radio
Most surviving TR-1s no longer work. Many collectors (such as myself) prefer to keep them in "as-manufactured" condition. That way the authenticity is preserved...
rf radio – Circuit Schematic
rf radio
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vest pocket vhf fm test generator – Circuit Schematic
vest pocket vhf fm test generator
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simple long range fm transmitter – Circuit Schematic
simple long range fm transmitter
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medium wave modulator 2 – Circuit Schematic
medium wave modulator 2
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high level wideband rf preamplifier – Circuit Schematic
high level wideband rf preamplifier
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fm tuning indicator circuit – Circuit Schematic
fm tuning indicator circuit
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simple mini fm receiver – Circuit Schematic
simple mini fm receiver
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foxhunt transmitter – Circuit Schematic
foxhunt transmitter
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Rf (Radio) – Circuit Schematic
Rf (Radio)
A noise generator with a wideband output signal is always handy to have around when you`re adjusting receivers and other types of HF equipment. Simple RF Noise ...
10 Mhz QRSS Beacon – Circuit Schematic
10 Mhz QRSS Beacon
My beacon is using now a simple CW keying QRSS3 10140. 020 khz, power is 20 milliwatt. I`m using a PIC program PicBeacon di Ik2pcb. Click here for the reception...
TRF Radios – Circuit Schematic
TRF Radios
A small Medium Wave antenna from a walkman with digital radio and a variable capacitor (VC) with two sections connected in parallel from an old russian radio (2...
Amateur Radio circuits – Circuit Schematic
Amateur Radio circuits
For the shorter wavelength VHF and UHF bands it`s more practical to construct more complex antennas such as a single band Slim Jim or Yagis; I`ve had a go at a ...
Philco 32B Farm Radio Restoration – Circuit Schematic
Philco 32B Farm Radio Restoration
This radio was purchased on eBay as not working, and obviously missing all tubes and tube shields. I was told that it is a relatively rare set, being a Philco a...
VHF Twist-Shift Keying Rotation-Shift Keying Orthogonal BPSK Twist Modulation Motorola SyntorX – Circuit Schematic
VHF Twist-Shift Keying Rotation-Shift Keying Orthogonal BPSK Twist Modulation Motorola SyntorX
The material in this section shows how we built the Twist-Shift system for VHF using commonly available (and cheap) surplus land mobile VHF transceivers modifie...
Class E AM Transmitter for 1710 kHz – Circuit Schematic
Class E AM Transmitter for 1710 kHz
A 200-watt class-E AM transmitter used for non-sanctioned broadcasting on 1710 kHz. Negative peak limiter, over-modulation indicator, linear scale directional w...