VHF/UHF Mixer Local Oscillator
#VHF
#UHF
#mixer
#local oscillator
#RF
#frequency mixing
#signal processing
#radio
#communication
#wireless
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Reflex Radio Receiver
The RF signal is transmitted from the antenna through CI to a tuned circuit consisting of LI and C2. One end of L2 delivers the RF signal to the base of Q1 for amplification, while the other end connects to...
Ensemble II VHF RX rf
This stage begins at the VHF antenna. The incoming VHF RF signal is preamplified and filtered and presented as the "RF" signal to the ADE and Double Balanced Mixer (DBM). The mixer also accepts the Local Oscillator's output (before the...
Wireless two-tone electronic doorbell circuit diagram
The transmitter circuit is activated by pressing the SB button. Components D1, D2, R2, R3, and C4 form a low-frequency oscillator that controls an audio oscillator made up of D3, D4, D5, and D6, allowing them to operate alternately. The...
DF data transmission module and the super-regenerative receiver module
The DF data transmission module operates at a frequency of 315 MHz and utilizes a surface acoustic wave (SAW) resonator for frequency stabilization, ensuring high frequency stability. The frequency drift remains minimal, at only 3 x 10^-6, across a temperature...
Simple VHF FM radio
The RF stage of the receiver utilizes a transistor VT1, functioning as both a mixer and a local oscillator while also serving as a synchronous detector. A headphone cable acts as an antenna, capturing signals that are directed to the...
500 mW VHF Video Transmitter
Tuned circuits consist of C4, L1, C8, L3, and two 15 pF trimmer capacitors positioned across the collectors and emitters of both transistors. Other NPN transistors such as BC54, 2N3642, and 2N3643 may also be suitable. The circuit is designed...
Jammer circuit
The frequency jammer operates by generating interfering RF noise centered around a 2.45 GHz carrier frequency. As the power of this noise increases, the signal-to-noise ratio of the wireless communication channel decreases, leading to a higher bit error rate until...
RF Actuated Keying Monitor
Sending Morse on a rig without a sidetone is not impossible, but is not particularly pleasant either. This battery-powered monitor has been designed to provide an audible indication of keying for those whose rigs lack a CW sidetone. Its sensor...
uhf tv pre amplifier
This is another UHF-TV preamplifier circuit diagram that is simpler than the previous UHF TV preamplifier. This circuit is based on the MPSH10 transistor. Alternatives that can be used to replace the MPSH10 include the BF180 and BCY90. The tuned...