Description

CPI VZC6967AM 700W C-Band TWT BUC appears to have very low hous except for time spent testing.

It shows 596 Beam on hours and 669 Heater hours. CPI installed a BUC on the input effectively converting the TWTA to a high-power BUC. They also sold this amplifier with a built-in linearizer ensuring accurate output across the entire frequency range of 5.845-6.650 GHz.

RF Output Power

750 W peak power class
Rated output at TWT flange: typically 700–750 W
Linear output: ~350–450 W depending on linearizer and backoff
Meets IESS‑308/309 phase noise and linearity requirements

We sent it to our engineer facility with instructions to test and report any failures

Equipment Repairs-CPI VXC6967AM serial #C11620L9  rack mount c-Band s/BUC.

Complaint:  Check for proper function

Evaluation:  Unit powers up with occasional flicker on standby LED. L-Band input does not require 10 MHz. Reference.  L to C conversion 2.5 above normal. Spectral regrowth 320 watts or better with C/I @ 28 db. for most of bandwidth.

Repairs-TWT:  no repairs needed,  all tests completed successfully

Test-Linearizer: no repairs needed, settings OK and at gain=0, phase=88 and ampl=13.Tested into dummy load up to 440 watts modulated qpsk 6.2 mhz sym-rate @3/4 fec.Helix 1 from 0.5 ma going from low to high power.Input -20 dbm L-Band

Beam on hours: 596  Heater on hours: 669
Tested at 240 VAC