VHF Engineering
#VHF
#RF
#communication
#wireless
#signal processing
#transmitter
#receiver
#antenna
#electronics
#engineering
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Cyclotron II
The white feedthroughs are for connecting the RF high voltage to the D's (not shown). The copper pipe perpendicular to the main pipe serves as the vacuum line. The D's are equipped with screw posts on the side for connecting...
1watt AM/CW 10-meter band transmitter
In this project, you will make a simple 3-stage low-power broadcast-type circuit, using a crystal oscillator integrated circuit and a collector modulated AM oscillator with amplifier. You can connect the circuit to an electret microphone or amplified dynamic microphone. Using...
ultra miniature transmitter
This transmitter is approximately the size of a large coat button. It accepts direct voice input and operates on a single watch-type button cell, providing several tens of hours of use. The schematic illustrates that this transmitter is likely the...
VHF remote control
A few designs for remote control switches, using VG40T and VG40R remote control pair, are shown here. The miniature transmitter module shown in Fig. 1, which just measures 34 mm x 29 mm x 10 mm, can be used to...
Voltage-Tuned Vhf Oscillator
This VHF VCO circuit operates within the frequency range of 30 to 200 MHz. Q1 may be substituted with a 2N3563 for frequencies exceeding 100 MHz. The inductor, L1, is selected to resonate at the desired frequency in conjunction with...
VHF Antenna Amplifier Circuit Using BFT66 Transistor
This design presents a simple antenna amplifier electronic circuit project, which can be utilized based on the provided circuit diagram. The antenna amplifier operates effectively within a frequency range of 1 to 300 MHz. It is suitable for high frequency...
Switchable Vhf Active Antenna Circuit
The AA-7 active antenna consists of two active components: Q1 (an MFE201 N-channel dual-gate FET) and Q2 (a 2SC2570 VHF silicon transistor), which form the foundation for two independent, switchable RF preamplifiers.
The AA-7 active antenna is designed to enhance the...
Rfrxd0420 Ask Receiver Reference Design
The RFRXD0420 and RFRXD0920 are low-cost, compact, single-frequency short-range radio receivers that require only a minimal number of external components for a complete receiver system. The RFRXD0420 operates within the frequency range of 300 MHz to 450 MHz, while the...
The VHF antenna switch
A use has been found for a collection of DIP-style RF relays acquired from a discount electronics shop. These relays are completely sealed and RF shielded, featuring low contact capacitance, making them suitable for VHF frequencies. They operate at 12...