A19 Sbtx/Rythm Assembly - Agilent Technologies PSA Series Service Manual

A19 SBTX/RYTHM Assembly

The A19 assembly is comprised of the SBTX (switched barium-ferrite
tuned filter/mixer), and the RYTHM (routing yig-tuned harmonic
mixer). The SBTX and the RYTHM are not separately replaceable. The
SBTX provides a switch that routes the input signal to the RYTHM
(high band and low band signals) or through the SBTX preselector and
mixer (mm band path). The following table lists the frequencies where
the switch points occur.
Center Frequency
(Instrument in zero span)
3 Hz to 3 GHz
3.05 GHz to 26.8 GHz
> 26.8 GHz
The RYTHM bands are bands 1 through 4 whose start (minimum) and
stop (maximum) frequencies are shown in the following table:
Band Minimum Frequency
1
2
3
4
The mixing equations are:
Band 1
Band 2
Band 3, 4
F
IF
Chapter 4
Troubleshooting the RF Section (E4446A, E4447A, E4448A)
RF Section Description (E4446A, E4447A, E4448A)
Signal Routed to First Mixer on:
(through SBTX and RYTHM switches)
Maximum Frequency
2.85 GHz
6.2 GHz
12.8 GHz
18.7 GHz
F = F + F
LO RF IF
F = (F + F )/2
LO RF IF
F = (F + F )/4
LO RF IF
= 321.4 MHz
Low band
RYTHM
SBTX
6.6 GHz
13.2 GHz
19.2 GHz
26.5 GHz
101