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WJ-871x Receiver Family

WJ-8715, WJ-8716, WJ-8718 and AN/URR-74(V)

Front

WJ-8716

WJ-8718

AN/URR-74(V)

WJ-8716/MFP

WJ-8718/MFP

Back

WJ-8716

WJ-8718

AN/URR-74(V)

 

 

Connectors

WJ-8716

WJ-8718

 

 

 

Insides

WJ-8716

WJ-8718

AN/URR-74(V)

 

 


The Front View

The WJ-8716 and WJ-8718 are difficult to tell apart from the front if the name plate is missing. The AN/URR-74(V) and MFP version are easier to identify but you won't be able to tell a WJ-8716/MFP from a WJ-8718/MFP from the front if they are missing the name plate. The best way to identify these radios is to look at the back.


WJ-8716
- Compared to the WJ-8718 below, they look identical.



WJ-8718 - Compared to the WJ-8716 above, they look identical.


AN/URR-74(V)

The running time meter and the different signal-audio level meter
make this receiver stand out form the others.


WJ-8716/MFP
This is basically a different radio based on the same internal mainframe.
The WJ-8716/MFP and WJ-8718/MFP are identical from the front panel.


WJ-8718/ MFP
The MFP option transforms one of these radios. It adds keypad entry, 99 memories,
scan and search functions with adjustable threshold and dwell and memory examine.
The ergonomics are wonderful, simple and highly intuitive. For more details.

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The Backside View

WJ-8716 - WJ-8718 - AN/URR-74(V)

A quick look at the back is the easiest way to tell an WJ-8718 from a WJ-8716 or AN/URR-74(V). The WJ-8718 has barrier strips for audio connections. The WJ-8716 has BNC connectors. The AN/URR-74(V) has military connectors.


The back of the WJ-8716. Notice the BNC connectors for audio. For more detail.


The WJ-8718 has barrier strips for audio connections. For more detail.

This radio has an addition jack labeled J14, which is for the SMO - Spectrum Monitor Output, a 455kHz pre-IF filter 30 kHz wide output for connection to the WJ-9188-18 spectrum display unit that was designed to accompany these radios. (BNC above spare fuse).


AN/URR-74(V)
rear panel
note the military style connectors for audio and power and
the N for antenna (obscured by adapter) instead of a BNC.


The WJ-8716 audio outputs (left) compared to the WJ-8718 audio outputs (right).
The IF output (J12) on the WJ-8718 is narrowband post-filter for external demodulators.

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The Inside View

WJ-8716 - WJ-8718 - AN/URR-74(V)

The inside views don't reveal much difference to the untrained eye. The insides are essentially identical except for seeing the back of what you can already see from the outside.


This WJ-8716 has two nice options. It has the PRE - preselector (larger silver box in the upper bay), the 488-1 - GPIB remote controller (middle and lower cards in the second bay from the bottom). These options seem to be more common on the WJ-8716 than any other version.


This is the inside of a WJ-8718/MFP. The MFP option is the two cards in the
second bay from the bottom. It also has an SMO option, which you can't see.
Notice the big opening in the top bay where the PRE option exists in the WJ-8716 inside photo.


The inside of the AN/URR-74(V) reveals nothing different that you can't see from the outside.

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