Tektronix 494AP service manual Externalmixer, Inputsignalcharacteristics

I

o o

t

o

I	Characteristic
o	RF INPUT
I
o
t	lmpedance
I	VSWRwith 10 dB or moreRF
o	Attenuation
	10 kHz-2.5GHz
o	2.5-6.0GHz
I	6.0-18GHz
a	18-21GHz
I	VSWRwith0 dB RF
	Attenuation
o
o	10 kHz-2.5
o	GHz
	2 . 5 - 6 . 0GHz
o	6.0-18GHz
I	18 - 21 GHz
o	Maximum
o	SafeInput
	With 0 dB RF attenuation)
o
o	point
O	1 dB Compression
	(Minimum)
t	Bands1-5
e	(10kHz-21GHz)
tc	EXTERNALMIXER
o
o
o	EXT REF IN
	Frequency
o
o	Waveshape
o
o	lmpedance
I
o
o
o
I
t

Specification - 4g4Al494Ap Service, Vol. 1

Tabte2-3

INPUTSIGNALCHARACTERISTICS

SupplementalInformaton

Type N female connector,specifieO to 21 GHz.

(See Option07 in the Optionssec- tion for supplementalspecifications concerningan additional75 O input.)

5 0 ( )

1.3:1(typically1.2:1)

1 . 7:1(typically1 . 5:1)

2.3:1(typically1.9:'t) 3.5:1(typically2.7:1)

Measured from '1

0 kHz to 1.9 GHz on Band 1, and measured within 3 MHz of the center of the preselected band on Bands2,3,4, and 5 .

Typically1 . 9:1

Typically1 . 9;'l

Typically2.3:1

Typically3 . 0:1

+30 dBm (1W) continuousor 75 W peak, pulse width of 1 ps or less with a maximum duty factor of 0.001 (attenuatorlimit)

DO NOT APPLY DC VOLTAGE TO

THE RF INPUT

With no RF attenuation

With MIN DISTORTIONon and not in reduced gain mode

Measured at the 10 MHz lF output - 10 dBm with MtN NOTSEon

Input for an lF signal from an exter- nal waveguidemixer.

Provides dc bias for the external mixer. See OutputCharacteristics.

1MHz, 2 MHz, S MHz, or 10 MHz . * 5 P P M

-1 5 d B m t o + 1 5 d B m

Sinewave, ECL or TTL, with a duty cycle of 40%-60%

5 0 O a c o r 5 0 0 O d c

2-11

3