Rohde & Schwarz R&S FSP Series, Operating Manual

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R&S FSP Instrument Functions
LO/IF ports for external mixers - Option R&S FSP-B21
4.270 Operating Manual 1164.4556.12 - 06
After selection of a file the parameters BIAS for the SELECT BAND table are taken
from that file. The selected mixer type must correspond to the file entry PORTS . It is
not possible to modify these parameters during operation.
Only that part of the table is taken into account that contains reference values for fre-
quencies that are covered by the selected order of harmonic. (See section
“Conver-
sion Loss Tables” on page 4.271 )
Remote command:
MIX:LOSS:TABL mix_1_4
CONV LOSS
TABL
The CONV LOSS TABLE softkey opens a submenu for selecting and editing of con-
version loss tables. (See section “Conversion Loss Tables” on page 4.271 )
Remote command:
--
ACCEPT BIAS The ACCEPT BIAS softkey stores the bias setting selected in the table SELECT
BAND in the file specified in the table.
The user is prompted to confirm the storage. The new setting will be stored only
when confirmed with
YES .
This softkey can only be used if CONV LOSS TABLE (conversion loss taken into
account by means of frequency-dependent values) is active.
Remote command:
--
LO LEVEL The softkey LO LEVEL changes the LO level of the external mixer LO port from 13.0
dBm to 17.0 dBm in 0.1 dB steps. Default value is 15.5 dB.
Remote command:
[SENSe1:]MIXer:LOPower 16.0dBm
SIGNAL ID /
AUTO ID /
AUTO ID
THRESHOLD
The SIGNAL ID , AUTO ID and AUTO ID THRESHOLD softkeys are used for signal
identification.
Remote command:
MIX:SIGN ON
See section “Signal Identification” on page 4.277 .
Bias Current
Single-diode mixers generally require a DC voltage which is applied via the LO line.
This DC voltage is to be tuned to the minimum conversion loss versus frequency.
Such a DC voltage can be set via the BIAS function using the D/A converter of the
R&S FSP. The value to be entered is not the voltage but the short-circuit current.
<NONE>
Band_A_4
Mixer_4
SELECT