nThe frequency of the incoming signal should be within -0.5 to +5.0 MHz of the selected frequency or the analyzer will not be able to phase lock to it.

CW Frequency Range in External Source Mode. 300 kHz to 3 GHz (6 GHz for Option 006)

Compatible Sweep Types. The external source mode will only function in CW time sweep. If the instrument is in any other sweep type when external source is activated, the warning message CHANGED TO CW TIME MODE will appear on the display.

External Source Requirements. The external source mode has spectral purity and power input requirements, which are described in Chapter 7, “Specifications and Measurement Uncertainties. n

Input Channel: R

Capture Range. In either automatic or manual mode, you can enter the frequency of the

e&,md CW signal ushg the ~~~~~~i softkey (located under the Stin,dus m key). me

..................... _.,

actual signal must be within a certain frequency capture range as shown in l’hble 6-8.

‘lhble 6-8. External Source Capture Ranges

 

MO&

cw Fkeqnency

CW=e Bange

 

Antmuatlc

< 60 MHz

f5 MHz of nominal CW frequency

 

 

>60MHz

4~10% of nominal CW frequency

 

 

 

 

 

I-

Im

I-0.6 to + 6 MHz of nominal CW frequency

If the incoming signal is not within the capture range, the analyzer will not phase lock correctly.

Locking onto a signal with a frequency modulation component. Although the analyzer may phase-lock onto a signal that has FM, it may not accurately show the signal’s amplitude. The accuracy of such measurements depends greatly on the IF bandwidth you choose. Use the widest IF bandwidth available (3 kHz) if this problem occurs.

Tuned Receiver Mode

/ ..,. __ .....

If you press @KJ ~~~~~~~~~~

independently of any signal source.

::ii.:.:...:.:.........:.: i...... :::IT:::: y.:::v y::, / / ....... ,.....:..:_:

.~~:~,~~~~, the analyzer receiver operates

..~.........~

i

/;;;./.;:.../.i

The following features and limitations apply to the tuned receiver mode:

nIt is a fully synthesized receiver; it does not phase-lock to any source.

nIt functions in all sweep types.

nIt requires a synthesized CW source whose timebase is input to the analyzer’s external frequency reference.

For more information on using the tuned receiver mode, refer to Chapter 2, “Making Measurements ’

Application and Operation Concepts 6-l 18