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A lot of test equipment requires various accessories as part of the operating configuration.  These include: adaptors; aerials; attenuators; cables; couplers; detectors; power splitters; sensors; terminations; etc.  Some of these accessories are general purpose items that can be used with a variety of equipment.  Often these accessories are specific to the item of test equipment.
When the equipment is no longer required and sold on, these accessories are often discarded along with the Manuals.  This makes these accessories sometimes hard to find and expensive!
BNC male with wideband telescopic aerial.
For use with Spectrum Analyser.
These are RF passive devices used to couple a specific proportion of the power travelling in one transmission line out through another port.  This enables power levels to be sensed without making a direct connection to the transmission line carrying the power.  Applications include power level monitoring and automatic level control (ALC).
MAC Technology C4238-20 Wideband Directional Coupler.  SMA connectors, 20dB coupling, 0.9dB insertion loss, 15dB directivity 2-12.4GHz, 12dB directivity 12.4-18GHz, 1.40 VSWR primary line, 1.50 VSWR secondary line, 25W max. 
MAC Technology CA3333-40A High Power Directional Coupler.  N-type and SMA connectors, 40dB coupling, 0.2dB insertion loss, 16dB direc tivity 1-4GHz, 1.20 VSWR primary line, 600W max.
Ports 1 & 2 are the main transmission line.  Port 3 is the coupled port and Port 4 is the isolated port which may be internally or externally terminated.  The coupling loss is between Ports 1 & 3.  The insertion loss is between Ports 1 & 2.  The directivity is between Ports 3 & 4.  Isolation is between Ports 1 & 4.
These are RF passive devices for measuring RF power levels.  RF power applied can be continuous wave (CW) or modulated.  They are essentially diodes that rectify the RF signal and produce a dc voltage output.  The crystal detector can be used as a demodulator to obtain a pulse envelope which can be seen on an oscilloscope.

HP 8470A Crystal Detector.
10MHz to 18GHz bandwidth, negative dc output, 100mW max.
HP 8471A RF Detector.
100kHz to 1,200MHz bandwidth, negative dc output, 3Vrms max.

HP 86290-60045 Detector.
2GHz to 18GHz, negative dc output.

Radiall R 451570 Coaxial Detector.
Power Sensors
These power sensors are used specifically with the HP 435/436/438/438 series of Power Meters.

HP 8481A Power Sensor.
1µW to 100mW, -30dBm to +20dBm, 10MHz to 18GHz.
See Power Meters for details.

HP 8484A Power Sensor.
0.3nW to 10µW, -65dBm to -20dBm, 10MHz to 18GHz.
See Power Meters for details.
Power Splitters
These are RF passive devices that split the input power equally to 2 output ports.
Greenpar Power Divider.
6dB insertion loss, 10GHz bandwidth.
HP 11652-60009 Power Splitter.
6dB insertion loss, 110MHz bandwidth.
See HP 11652-60009 Power Splitter for details.

HP 8721A Power Splitter.
6db insertion loss, 110MHz bandwidth.
Can also be used as a directional bridge.  See HP 8721A Directional Bridge for details.
Mini Circuits ZSC-2-1 Power Splitter.
3dB insertion loss, 400MHz bandwidth.
BNC 50Ω Terminations and Tektronix 011-0049-01 BNC 50Ω Inline Termination, used with HP 5316A Universal Counter. 
... and Finally ...
Some miscellaneous accessories.
HP 08553-60122 50 ohm Termination.
Used with HP 141T Spectrum Analyser.

HP 11072A Isolator.
Used with HP 3406A Broadband Sampling Voltmeter.
HP 11660A Tracking Generator Shunt (home made version).  Used with HP 8556A Spectrum Analyser LF Section.  This is just a resistor of 54.5Ω across the Tracking Generator output.  This is used to modify the source impedance from 600Ω to 50Ω.

October 2014
2 off HP 8761A SPDT RF Switch.  DC to 18GHz.  One is Option 000 with 3 off N-type male connectors and the other is Option 001 with 2 off N-type male and 1 off N-type female connectors.  Although they have a 12 to 15Vdc coil voltage, a special driver circuit is required.  These Switches are still a current Keysight Technologies part.

February 2015
HP 1250-2656 50Ω Termination, DC to 18GHz, N-type male connector.

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