Heterodyne wave meter `` Ч4-1 ''.
Instruments for adjusting and controlling the PTA.Since 1951, the Ch4-1 heterodyne wave meter has been produced by the Chervonograd Equipment Plant. GW is used to check the frequency calibration of transmitters and receivers operating with continuous oscillations. Operating frequency range of the device: 0.125 ... 20 MHz. Measurement error 0.01%. Wave meter "Ch4-1" was produced in four versions under the numbers 526, 526U, 527, 528. Version No. 526 is designed for operation in the field and is powered by rechargeable batteries and dry batteries. Option No. 526U is universal and is designed to work in field and laboratory conditions. Variants No. 527 and 528 practically do not differ from each other and are intended for operation in stationary conditions. All devices have a similar appearance, differing only in small permutations of the controls on the front panel. Each device is supplied with instructions for working with a specific device and a calibration book, by which it is easy to determine the required frequency for measurements.
