Kenosha Reuse Discussion Board > ZION, IL
> Watkins johnson wj-8711A lf-hf communications receiver
Watkins johnson wj-8711A lf-hf communications receiver
WATKINS JOHNSON WJ-8711A LF-HF PREMIUM COMMUNICATIONS RECEIVER
This is in Great condition!! I plugged it in and put a antenna on it and it works great!! This is made by Watkins Johnson.. This passes all built in self tests... This has DSP firmware Version 4.00.00 marked on the "DSP A" firmware IC and 3.0 on the 8711A chip. This has BITE (Built In Self Test). Watkins Johnson is a USA company in Gaithersburg, MD USA.. This comes with the manual and AC power cord..
The following is from the internet and may or may not fully reflect what I am selling here:
The WJ-8711A is a fully synthesized, general-purpose HF receiver for monitoring RF communications from 5 kHz to 30 MHz with 1 Hz tuning resolution. By combining analog and digital signal processing (DSP), the WJ-8711A achieves high performance at low cost.
DSP techniques accomplish functions such as noise blanking, IF filtering, AGC, demodulation, beat frequency oscillator (BFO) and passband tuning. Filters with superior amplitude and group delay characteristics are achieved with digital stability and repeatability. The receiver has 66 standard selectable IF bandwidths. Available detection modes are AM, SAM, FM, CW, USB, LSB and ISB. An operator can adjust the tunable BFO in 10-Hz steps over a 8000 Hz range, and the available passband tuning further enhances the reception of CW signals. Gain control is manual or automatic, with fast, medium and slow AGC modes. An operator can adjust the squelch threshold from 0 to -135 dBm, or disable it. Enabling the noise-blanking feature effectively eliminates the adverse effects of impulsive noise.
In addition to fixed-frequency tuning, the WJ-8711A provides fast, flexible scanning in three modes: channel scan, F1-F2 scan and F1-F2 scan with lockouts. Dwell times are available for all scan modes from 0.5 to 20 seconds or infinite. The channel-scan mode provides 100 programmable memory channels. The operator can specify sectors of memory for individual channel scans, allowing the subdivision of available memory into multiple search scenarios. Operators can specify that the receiver skip certain channels without deleting them from memory. Memory channels can also be single-stepped manually. In both F1-F2 scan modes, the step size is user-selectable from 1 Hz to 25 kHz. The receiver can store up to 100 independent frequency lockouts
* Frequency coverage from 5 kHz to30 MHz in 1-Hz steps
* High dynamic range: +30 dBm third order intercept typical
* Digital filtering provides 66 IF bandwidths up to 16 kHz with exceptional shape factors
* AM, SAM, FM, CW, USB, LSB and ISB detection modes standard
* Fast, flexible scanning with 100 memory channels
* Large readable LED displays and user-friendly controls
* Three variable AGC decay settings
* Noise blanking and passband tuning
* Internal switchable preamplifier and attenuator
* Standard remote interface (optional Multidrop RS-232, RS-485, RS-422, CSMA or IEEE-488)
