200 34980A User’s Guide
7 RF Multiplexer Switch Modules
34941A and 34942A RF Multiplexer Switch Modules
The 34941A and 34942A Quad 1x4 RF MUX switch modules provide high
density RF signal switching with four independent 1x4 multiplexer banks
in each module.
The important differences between the two RF MUX modules lie in their
characteristic impedance and their use of connectors (connectors are not
provided with the module). The 34941A, the 50-
Ω version, uses SMA
connectors. The 34942A, the 75- Ω variation, uses Mini SMB connectors.
Both the 34941A and 34942A modules contain four banks of latching
switches. Each bank consists of three form C relays. See the simplified
schematic on page 203.
The RF MUX modules do not connect to the analog buses. Instead, all
signal connections are made through the visible connectors via external
cables. Each visible connector on an RF MUX module is labeled with a
number
(11 through 44) that represents a channel you can close program a tic
ally, from the front panel, or with the Web UI. When you close a channel
on the RF MUX modules you automatically close all relays that create a
direct path to the Common of a bank.
With RF MUX switches, you cannot open switches program a tic ally. You
can only close a channel. When you close one channel, another channel
automatically opens. Therefore, only one channel relay in each bank is
closed at any time.
Each bank is chassis- grounded. Alternatively, you can easily isolate a
bank from other banks and from chassis ground as well. Refer to
page 201 for instructions to install insulating washers.
You can connect the banks in this modules and to banks in other RF
MUX modules to create a larger switching configuration. For example,
you can create up to 1x97 RF MUX in a single 34980A mainframe.
NOTE
For the 34942A, it is recommended that you use gold-plated straight plug
connectors (75Ω Miniature SMB). Because of the space constraints
between connectors on this module, right-angle plugs and SMB adapters
are not recommended.
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