Tektronix 494AP service manual O o a, O a a, 12s, 103 Trr, Sensitivity

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Band/Frequency

eanQ (cut,

Input)

10 kHz-l.8 GHz

\rPuonu/ (/5{r Input) 5 MHz-l GHz

E anss z 6( U (5U{1,

Input)

1.7 GHz-7.1 GHz

Eano4 (curl tnput) 5.4-12 GHz

Band4 (50o Input) 12-18 GHz

uano] (5utr tnput) 15-21 GHz

bano bs (5o{} Input) 78-27 GHz

Eanos / arue(5uo Input)

26-60 GHz

Band9c(50OInput) 50-90 GHz

Band10c(50o Input)

7$-140 GHz

-

Band11c(50OInput) 110-220 GHz

Bandl2c (50O fnput) 170-325 GHz

			Performance		procedurc -		4g4Ll4g4ApService Vol. l
			Check
		Table4-8
	SENSITIVITY.
		tN dBm (dBmVfor 75o tNpUT)
I MHz	1 MHz	300 kHzb	100kHz	10 kHz		1 kHz		100Hz	10 Hz
-80	-85	-90	-95	-105		- 1 1 5		-12s	-134
-31	-36	-41	NA	-56		-66		-76	-85
-74	-79	-u	-89	-99		-109		- 1 1 9	-125
-60	-65	-70	-75	-85		-95		- 105	- 1 1 1
-55	-60	-65	-70	-80		-90		-l 00	- 1 0 7
-55	-60	-oc	-70	-80		-90		-100	-'t07
-65	-70	-75	-80	-90		-100		-108	- 1 1 6
-60	-65	-74	-75	-85		- 9s		- 103	- trr

ypically-95dBm for 1 kHz resolutionbandwidthat 50 GHz,degradingto -g5 oam at g0 iHz

ypically-90 dBm for 1 kHz resolutionbandwidthat zs aHz, oegradingto -7s oam ai 40 GHz

ypically-80dBm for 1 kHz resolutionbandwidthat 110 enr, o"graoingto -65 dBm at 20 GHz

ypically-70dBm for 1 kHz resolutionbandwidthat 170 GHz,degradingto -55 dBm at 25 GHz

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21.Gheck Residual Spurious Response With no inputsignat,-100dBmoi tessl

_a. Removeany signal connectedto the RF lNpUT, and terminatethe RF tNpUT in 50O. Set the Spectrum Analyzercontrolsas follows:

CENTERFREQUENCY	50 MHz
SPAN/DIV	10 MHz
RESOLUTIONBANDWIDTH 10 kHz
REFLEVEL	-50 dBm
MIN RF ATTEN dB	0
VERTICALDISPLAY	10dB/Dtv
TrME/DtV	AUTO

b.Press <Green-SHIFT>STEPSIZE to estabtish a centerfrequencystep size. This will allow changing center frequencyin 50 MHz incrementsby use of the +STEPand -STEPpushbuttons.

c.Scanthe frequencyrangeof bands "1, Z, o( S in 100MHz increments.Note the amplitudeof any spuri-

ous response. Spuriousresponseamplitudesmust not exceecl-100 dBm. (ActivatingA F after each incre- ment, makes it easier to determine100MHz incre- ments.)

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aEquivalent maximum inPut noise (average nois€ {or €sch resolution bandwidth with int€rnal mixer and rEKTRoNtx waveguide Mixers),

bOption 07 reptaces the 100 kHz filter with a 300 kHz filter.

cTEKTRONIXWaveguideMixers.

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