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The AN/URM-25 was part of a series of vacuum tube-based signal generators built for the U.S. military in the early Cold War-era.. Today they are collected and used by vintage amateur radio and antique radio enthusiasts who say they provide reasonably high accuracy and stability for a low cost, with build quality reflecting tough military construction requirements and standards.
Portions of Fallout 76 score were also released as a vinyl record and CD. In 2018, French retailer Micromania offered a pre-order bonus 10-track LP featuring 5 songs from the Fallout 76 score and 5 songs from the Fallout 4 score. [39] [40] A 5-track sampler CD was also offered at various game retailers.
When the TV is tuned to the programmed channel, the video and audio signal of the source device is accessed. RF modulation can become difficult in a CATV system. High pass, low pass, and notch filters must be used to block certain frequencies, or channels, so that the modulator can broadcast the audio/video signal of the source device on that ...
Wireless Set No. 76 – Transmitter set used in conjunction with receiver R109. Wireless Set No. 88 – VHF manpack set from 1947. Wireless Set No. 108; Larkspur radio system. Station Radio A13 – HF manpack transceiver. Station Radio A40 – Based on the Canadian C/PRC-26. Station Radio A41 – British copy of the US AN/PRC-10. Replaced the ...
Typically a transmitter design includes generation of a carrier signal, which is normally [3] sinusoidal, optionally one or more frequency multiplication stages, a modulator, a power amplifier, and a filter and matching network to connect to an antenna. A very simple transmitter might contain only a continuously running oscillator coupled to ...
The output frequency of the transmitter is proportional to the speed of the rotor. To keep the frequency constant, the speed of the electric motor turning it was controlled with a feedback loop. In one method, a sample of the output signal is applied to a high-Q tuned circuit, whose resonant frequency is slightly above the output frequency. The ...
In the Armstrong method, the audio signal and the radio frequency carrier signal are applied to the balanced modulator to generate a double sideband suppressed carrier signal. The phase of this output signal is then shifted 90 degrees with respect to the original carrier. The balanced modulator output can either lead or lag the carrier's phase.
The device, a passive cavity resonator, became active only when a radio signal of the correct frequency was sent to the device from an external transmitter. This is referred to in NSA parlance as "illuminating" a passive device. Sound waves (from voices inside the ambassador's office) passed through the thin wood case, striking the membrane and ...