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UHF indicator or wavemeter is some kind of device that measures frequencies and determines LC circuit frequecy resonance. This device does not need to radiate. The oscillator is build with T1 and T2 (2 x BF494) and can be adjusted with C1 and Lx. The Lx coil....
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Microphone amplifier consists of LM324 and two transistors. LM324 is available in 14 pin DIP. I brought it for Rs: 6/-. It contains four identical operational amplifiers. Transistors BC548 and BC558 are used as compressor. I used 2-wire shield wire for....
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The ISL5929 is a dual 14-bit, 130/210+MSPS (Mega Samples Per Second), CMOS, high speed, low power, D/A (digital to analog) converter, designed specifically for use in high performance communication systems such as base transceiver stations utilizing 2. 5G or....
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ATA6823 is designed specifically for automotive applications that require high-power motors. It provides four high-current Gate driver outputs capable of driving a wide range of n-channel Power MOSFETs in a full-bridge configuration. A fully integrated....
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This article is copied from replica sites to here in order to have a local and long living copy at hand. It seems like had radical rework done to it sometime in 2006 and original copy of this article disappeared. When discussing SSB transceivers, the first....
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The circuit shown here is of a TV antenna booster based on the transistor BF180. The circuit operates in the UHF band and has a gain of 15dB. Capacitors C2, C3 C4, C5 and inductors L3, L4 forms a UHF band pass filter. The input signal is fed to the emitter....
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Most modern transceivers have a built in interface. These interfaces work well in digital modes, but seem to lack support in analog voice modes. A case in point is the Yaesu transceivers that only permit the use of their internal interface when the....
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This application note explains the operation of the data slicers found in the Maxim line of UHF receivers like the MAX1470, MAX1473, and MAX1471 and transceivers like the MAX7030 and MAX7032....
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The LO system from the project entitled A Monoband SSB/CW Transceiver in Chapter 6 of EMRFD. The mega low (about -20 dBm) output from a diode ring mixing a VFO and crystal oscillator is triple tuned band-pass filtered and then amplified to +8 dBm. Continuing....
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This PSU has been especially designed for current-hungry ham radio transceivers. It delivers safely around 20Amps at 13. 8V. For lower currents, a separate current limiting output, capable of 15ma up to a total of 20A has been added. Let us see what we have....
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The microphone amplifier / modulator is build around LM324 which is a quad op amplifier provides enough quality amplification to voice picked up by the condenser microphone...
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Modification of the Icom IC-718 Transceiver for ALE, to de-activate the transmit bandpass relays during receive and scanning....
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This is a low cost fm antenna booster that can be used to listen to program from distant FM stations clearly. The antenna fm booster circuit comprises a common-emitter tuned RF preamplifier wired around VHF/UHF transistor 2SC2570 (C2570). This is the....
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TA1326FNG The TA1326FNG is a UHF band RF Modulator IC that features PLL-based RF Carrier and Audio intercarrier oscillation. The TA1326FNG is compatible with PAL and NTSC Television systems and is lower in cost than TA1243 or TA1297 Series devices. By....
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This is a design circuit for an electrostatic transducer for ultrasonic measurement circuit. This circuit uses the LM1812 ultrasonic transceiver. Transducer x1 and LM1812 will transmit a burst of oscillations. Then the return echo is listened by using X1.....
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The ATA5423 ATA5425 ATA5428 ATA5429 is a highly integrated UHF ASK/FSK multi-channel half-duplex trans- ceiver with low power consumption supplied in a small 7 x 7 mm QFN48 package. The receive part is built as a fully integrated low-IF receiver, whereas....
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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 few such projects. Other projects will be an electronic unit of some kind: For the Intermediate....
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The circuit in Figure 1a and Figure 1b are the schematics of an ultrasonic proximity detector. It has a maximum detection range of approximately 6 ft. When someone passes in front of the ultrasonic transceiver board, the contacts of relay K1 will close. The....
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This UHF transmitter is designed for low power applications as remote for garage doors and operating systems, wireless alarm. This UHF FM transmitter with....
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The design of the circuit is aimed to create a preamplifier for television systems that would operate in the UHF frequency range of 450 MHz to 800 MHz and....
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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 modified to operate on the 2-meter ham band. The radios we used were the 100-watt Motorola SyntorX model.....
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There is a great deal of old amateur gear which many amateurs have decided to restore and bring back to life. While much of the early amateur transceivers work just fine they usually lack a digital readout and must rely on analog dials for tuning. The....
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A schematic diagram for a broadband QRP SWR metering circuit for use in a QRP antenna tuner. One could simply hold a momentary DPDT switch down and watch the LED while tuning the capacitors of the antenna tuner for minimum or zero light...
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A transverter on a range of 70 MHz. With access to the transceiver KENWOOD TR-751A (144 - 146 MHz), which was already prepared to work with the transverter DB6NT 5. 6 and 10 GHz, ie, output power is reduced to 1 watt, and transfer to the central core of....
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FM radio antena amplifier circuit diagram. This amplifier will pull in all distant FM stations clearly. Active FM amplifier circuit is configured as a common-emitter tuned RF pre-amplifier wired around the VHF / UHF transistor MFE201. Below is a circuit....
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An old RC car but without the transmitter so I built my own Rx/Tx using MCU and 2. 4Ghz transceiver, however, I want to use the car`s original H-Bridge but not sure if I understood how that circuit works...
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This PSU has been abnormally advised in place of current-hungry ham telephone system transceivers. It delivers vigilantly in relation to 20Amps on 13. 8V. For cut currents, a distant received attached output, able of 15ma up to a absolute of 20A has been....