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The universal HF radio receiver "US-P" has been produced possibly since 1948.
The receiver is designed to receive AM radio stations, tone modulation and telegraph (CW).
He became the modernization of receivers `` US '' and `` US-1 ''.
The receiver was created for military aviation, but was used as a coherent and even as broadcast.
It is a superheterodyne with one frequency conversion, has a range from 173 kHz to 12 MHz divided into five subbands.
Calibration on the subbands `` I '' 173 ... 350 kHz and `` II '' 350 ... 875 kHz is absent, it is replaced by an accurate scale broken by 180 degrees.
Bands 3 - 4 - 5 have an overlap of 900.2150 kHz, 2150 ... 5000 kHz and 5000 ... 12000 kHz.
The device has a UHF cascade on a 6K7 lamp, a converter with a local oscillator on 6A7 and 6K7 lamps, two UCH stages on 2 6K7 lamps.
IF "u003d 112 kHz.
Cascades are covered by the AGC system with a delay.
On the 5th subband, the UHF disables the AGC circuit and operates at maximum gain.
The detector and AGC are assembled on a 6X6C lamp.
The ULF is assembled on a 6K7 lamp, which is loaded on an autotransformer from the tap of which a signal is sent to the phones through the capacitance.
The sensitivity of the receiver is 10 μV in AM mode and 4 μV in CW.
Adjacent channel selectivity when receiving in CW exceeds 90 dB, when receiving AM about 60 dB.
The power is supplied from the umformer, which provides a voltage of 220 V through the anode circuits and 6.3 V over a glow at a current of 0.6 A from a voltage of 25.5 V DC, at a current of 0.6 A. The dimensions of the receiver are 113x331x204 mm.
Weight without umformer 5.6 kg.
The inscriptions on the control sticks are made with radioactive paint, the background of which exceeds the natural one by 15 ... 30 times and constantly glows in the dark with a beautiful greenish light, however later the inscriptions were made with ordinary white paint.
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