TB 11-6625 -3263-25
Condition Codes Replacement Lists Continued
Code
Condition
E72
Sierra 305A, 3055 Transmission Measurement System (305AL Level
Meter TS-2968/U, 305AT Tuning Unit, 360 Spectrum Display Unit; may
also contain 305AG tracking signal generator, 230A -233A passive and
active probes): Frequency range: 1 kHz to 33.5 MHz; input impedance 50,
75, 135, 2 k, 4 k, 100 k ohms depending upon probe; input signal level -
109 dBm to +22 dBm; spectrum display calibrated in frequency and
amplitude; selectivity filter BW = 250, 3100 Hz; similar to Test Set, Radio
AN/USM-306, AN/USM-306(V)1, TS -2721/U. TEMOD item frequency
range 50 Hz to 32.5 MHz; input impedance 75, 124, 135, 600 and 10 k
ohm; no probe supplied; input signal level -120 to +20 dBm, selectivity
filter BW = 20, 400, 3100 Hz and C-MSG weighing.
Cushman CE -21Selective Levelmeter: 75, 124, 135, 600, 10 k, 20 k, 100
E73
k ohms; model 211A bridging probe; input signal level -110 to 19 dBm;
selectivity filter BW = 200, 2300 Hz and C-MSG weighing; similar to FR -
211/U. TEMOD item input impedance 75, 124, 135, 600 and 10 k ohms;
no probe supplied; input signal level -120 to +20 dBm; selectivity filter BW
= 20, 400, 3100, C-MSG weighing.
Cushman CE -24A Selective Levelmeter: input impedance 75, 124, 135,
E74
150, 600, 10 k, 20 k ohms; input signal level -120 to +12 dBm; selectivity
filter BW = 45, 2300 Hz; portable; internal rechargeable batteries. TEMOD
item input impedance 75, 124, 135, 600, 10 k ohms; input signal level -
120 to +20 dBm; selectivity filter BW = 20, 400, 3100 Hz an d C-MSG
weighing; cannot be powered by battery source.
Cushman CE -70 Frequency Selective Levelmeter: input impedance 75,
E75
124, 135, 600, 10 k ohms; input signal level -120 to +20 dBm; selectivity
filter BW = 20, 400, 3100, C-MSG weighing.
E76
Marconi TF2330A Wave Analyzer: Frequency Range 20 Hz to 76 kHz;
input signal level 30 microV to 300 V F.S.; selectivity filter BW = 7 Hz.
TEMOD item frequency range is 50 Hz to 32.5 MHz; input signal level -
120 to +20 dBm; selectivity filter BW = 20, 400, 3100 Hz, C-MSG
weighing.
E77
All makes/models contain signal input connectors and corresponding
input impedance different than those of the TEMOD item (AN/USM-490);
impedances may be specified for unbalanced, balanced, terminating or
bridging conditions. Typically, wave analyzer input impedances are
greater than those for selective level meters.
E78
Item is battery operated; TEMOD item is not. Replace with TEMOD item if
battery operation is not required.
E79
The OS-261 series has a bandwidth to 200 MHz while the TEMOD item
has a bandwidth to 100 MHz. If users do not require a bandwidth above
100 MHz, the replacement for the OS-261 series is the AN/USM -488.
Units that do not require the bandwidth of the OS -261 series should take
action to change their authorization documents to reflect authorization for
the AN/USM -488.
E80
Item has an external battery option (Tektronix model 475 with option 07).
E81
Item has an EMC option (Tektronix model 475 with option 04).
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