|Pierson Electronic Corporation KP-81 Receiver|
Pierson Electronic Corporation
|Description||Professional Communication Receiver|
The KP--81 Professional Communication Receiver is a twenty tube superheterodyne radio receiver covering a continuous frequency range of from 5^0 tc ¿4-0,000 kilocycles. Particularly engineered to fill the composite requirements of the astute professional operator and the discerning amateur, the KP-81 possesses uniform gain over ita entire range, and includes in its design a number of exceptional features which provide unusually high degrees of selectivity, sensitivity and stability. Extreme selectivity is attained by employing two stages of pre-selection; 16 tuned circuits in the intermediate frequency amplifier; a crystal filter, and selective low and high pass audio filters. Sensitivity of the KP-Sl is unusually high,, 1-watt output being obtained for a signal input of but 0.5 microvolt. Stability is excellent, changes of local oscillator plate voltage ranging as much as 50 percent with negligible effect on frequency, even, at the highest tuning range. Image rejection ratios are exceptionally high, providing a freedom from image interference hitherto unknown. Band changing is accomplished by the use of a slide coil drawer employing heavy silvered knife switch contacts. Tuning dials are accurately calibrated, bandspread tuning being accomplished electrically by means of an additional tuning condenser which also controls a 500 kc. crystal-controlled oscillator for purposes of dial calibration, providing a market signal every 500 kc. throughout the radio spectrum. The noise silencer ia completely automatic and far more effective than the ,!limiter" type so often encountered. A calibrated variable pitch beat frequency oscillator, together with a new method of detector coupling, permits for the first time in a superheterodyne CW reception of an order superior to that for which old-type "THF” receivers have been noted. An adjustable squelch circuit is incorporated to permit "silent-between-station” operation at any signal level on any band, as desired. A signal strength meter, calibrated in "Rl! units, is provided for the measurement of signals received. All close tolerance coils, inductances, condensers, resistors and audio components are climatically sealed. The power output stage is capable of providing 12 watts of undistorted audio output. Other features include head-phone and phono jacks, and a communication switch which provides a means for not only placing the receiver in "stand-by" position but also for controlling a transmitter, as desired. Physically, the KP-81 consists of two units, one containing the tuning mechanism, all r-f, i-f and other controllable circuits; whereas the other contains the power supply, filter circuits, power output stage and loudspeaker. Beth chassis and their cabinets are ruggedly constructed of heavy gauge furniture steel, reinforced by ribbing. Weight of the complete receiver, uncrated, is 120 pounds. Power requirements of the KP-81 are 115 volts, AC, 50-60 cycles. Provision is made within the standard power supply unit for operation of the receiver upon 230 volts, AC, 50-60 cycles. For operation at AC frequencies of 25 or ^0 cycles, specification xaust be made upon ordering.
These manuals are available for the above equipment:
|Pierson Electronic Corporation -- KP-81 -- Service and User Manual|
|Manual Type||Service and User Manual|
|Size||5.44 Mbytes (5699390 Bytes)|
|Quality||Scanned document, all readable.|
|Upload date||27 September 2015|
|Downloads||85 since 27 September 2015|
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