RA Mayes | CPI | High Power TWT Amplifiers



	Amplifiers for High Power Microwave Immunity or Susceptibility Testing CPI is the only supplier that manufactures both the traveling wave tube (TWT) and the TWT amplifier. Complete line of instrumentation amplifiers available in octave and multi-octave bandwidths, covering the 1 to 50 GHz frequency range in power levels from 20 to 2000 Watts. Power combined systems up to 1000 Watts are also available. All TWT amplifiers are supported by CPI's worldwide 24-hour customer support network. CPI has your High Power, High Field Strength, Microwave Immunity Testing Solution. Amplifiers - 20, 100, 200, 250, 500, 1000, 2000 & 4000 Watts.	World Wide Support (click Globe)
	Communications and Power Industries Inc. (CPI) -formerly known as Varian Electron Device Business, originated in 1948 as the founding technology group of Varian Associates. From it's inception in 1948 until August 1995, this group established itself under the Varian name as the world's technological leader in microwave and x-ray generating devices and in electronic equipment to drive these devices. In August 1995, the Varian Electron Device Business and it's six Divisions became CPI Inc., with the mandate to continue to grow it's tradition of technology, leadership, and manufacturing excellence.

Model	Tech. Data File	Nominal Power (Watts)*	Frequency (GHz)	Gain (dB)*	RF Connectors	Delivery (Days)
Power Combined System	L - Ku Bands	500	1 - 18	50		90
Power Combined System		1000	1 - 18	50		90
VZL-6943J2		250	1 - 2.5	54	N	60
VZL-2780C2	L-Band	500	1 - 2.5	57	N	90
VZL-2778C1	L-Band	1000	1 - 2.5	50	N	120
VZS/C-6963J2		250	2 - 8	54	N	60
VZS/C-6963J2-POBO	S & C-Band	300	2 - 8	54	N	60
VZS/C-2780C2	S & C-Band	500	2 - 8	57	N	90
VZS/C-2778C1	S & C-Band	1000	2 - 8	50	SC	120
VZS/X-2776L1	C & X-Band	100	4 - 10	55	N	90
VZS/X-2777L1	C & X-Band	200	4 - 10	55	N	90
VZX-6993J4-POBO	X-Band	400	7.5 - 12	58	WR-112	90
VZX-6993J4	X-Band	500	8 - 10	58	WR-113	90
VZX-2782C1	X-Band	1000	8 - 10	76	WR-113	90
VZX-2783C1	X-Band	1000	8 - 12.4	63	WRD-650	90
VZM-6993J4		250	8 - 18	53.5	WRD-750	90
VZM-6993J4-POBO	X & Ku-Band	300	8 - 18	53.5	WRD-750	90
VZM-2780C2	X & Ku-Band	500	8 - 18	57	WRD-750	90
VZM-2778C1	X & Ku-Band	1000	8 - 18	50	WRD-750	120
VZK-6901J1		40	18 - 26.5	46	WR-42	120
VZK-2790J1	K-Band	150	18 - 26.5	50	WR-42	120
VZA-6902J1		40	26.5 - 40	46	WR-28	120
VZA-2790J1	Ka-Band	150	26.5 - 40	50	WR-28	120
VZQ-2791J1	Q-Band	50	40 - 50	50	WR-32G	120

MIL-STD-461E Amplifier System RS103 (200 V/m 1 - 40 GHz) * Power and Gain measured without any options
Model	.PDF File	Tech. Data File	Nominal Power (Watts)*	Frequency (GHz)	Gain (dB)*	RF Connectors	Delivery (Days)
VZL-6943J2			250	1 - 2.5	54	N	60
VZS/C-6963J2			250	2 - 8	54	N	60
VZM-6993J4			250	8 - 18	53.5	WRD-750	60
VZK-6901J1			40	18 - 26.5	46	WR-42	120
VZA-6902J1			40	26.5 - 40.0	46	WR-28	120

1.0 GHz to 18 GHz

1000 Watt Power/Phase Combined System

1.0 GHz to 18.0 GHz

>1000 Watts CW

Power/Phase Combined System

When two signals of identical phase and amplitude are fed to a 180 – degree hybrid or “Magic T” combiner, the two signals are summed in one of the O/P ports and cancelled in the other output port. Phase matching is more critical than amplitude (gain) matching. Initial differences at a given frequency, mid-band for example can be balanced out by inserting an adjustable phase shifter in series with one of the power amplifiers, and by adjusting the input attenuator of the respective amplifiers. The basic combining circuit is shown in the figure below. The RF input signal is fed to a 180 – degree divider (or splitter) to form two incoherent equal in amplitude signals. The two signals are amplified by the respective amplifiers and then re - combined in another 180 – degree phase combiner such as a hybrid or magic “T” or a variable ratio combiner. The phase shifter in series with the input to one of the power amplifiers is used in conjunction with the input attenuator of the power amplifier to balance the phase and amplitude of the two power amplifier output signals. The two signals are summed at the RF output port and any small unbalance in power is absorbed by the load termination. This unbalance is observed as a null reading on the power meter, which monitors the power to the dummy termination. A common variable attenuator is included in the input line for adjustment of the combined RF output level.