GU-104AM Печать

POWER TRANSMITTING TETRODE

GU-104АМ

 

The GU-104АМ is a ceramic/metal tetrode with plate dissipation of 250 kW intended for use as a RF power amplifier in AM broadcast service, RF linear SSB amplifier as well as for operation in key modes with width-pulse modulation.

 

General Characteristics

 

Electrical

Filament voltage 240,5 V

Filament current at 24 V 710 А

Cathode - mesh, thoriated tungsten

Interelectrode capacitances (grounded cathode):

Input 1300 pF

Output 140 pF

Feedback 5,5 pF

Frequency, max. 30 MHz

Mechanical

Maximum dimensions:

Height 680 mm

Diameter 295 mm

Maximum weight 45 kg

Cooling:

plate - water forced

other elements of envelope - air firced

Maximum envelope temperature 175о С

Maximum ratings

 

DC plate voltage: with no modulation 15 kV

with modulation 14,5 kV

DC screen voltage: with no modulation 1,7 kV

with modulation 1 kV

Plate dissipation 250 kW

Screen dissipation 8 kW

Grid dissipation 1 kW

 

RF power amplifier plate-screen modulated (class C)

Frequency 30 2 MHz

grounded grid grounded cathode

Filament voltage 24 24 V

DC plate voltage 14 14 kV

DC screen voltage 0,8 0,8 kV

DC grid voltage, negative 510 660 V

DC plate current 22,3 27 А

DC screen current 1,3 1,4 А

DC grid current 0,53 1,3 А

Output power 250 300 kW

 

 

Notes:

1. Plate modulation factor: ≤ 1, screen modulation factor: ≤ 0,7

2. In mode with plate-screen modulation plate dissipation can be increased up to 300 kW.

 

 

 

 

Linear power SSB amplifier at frequency 30 МHz (class АВ1)

 

1 tone 2 tones

 

Filament voltage 24 24 V

DC plate voltage 14 14 kV

DC screen voltage 1,4 1,4 kV

DC quiescent current 14 14 А

DC plate current 31 21.5 А

DC screen current 3 1 А

DC grid current ≤5 ≤1 mА

Output power 250 250 kW

in peak of envelope

Intermodulation distortion of 3-rd and 5-th orders minus 35 dB