WJ-1000A

Specifications   

High performance, triple-conversion, HF desktop receiver with last IF in digital technology. Frequency range 0.005-30 MHz, all-mode, 58 different bandwidths. Ideated in USA.

Reference market : professional / amateur-radio

WJ-1000A specifications

General
Frequency coverage
0.0050 ~ 30.0000 MHz
Mode
CW / LSB / USB / ISB / AM / AM-S / FSK / FM
Tuning step
1 Hz min
Receiver
Sensitivity
CW [1]28 uV (0.005~0.02 MHz, pre. OFF, 16dB S+N/N)
1.27 uV (0.02~0.05 MHz, pre. OFF, 16dB S+N/N)
0.5 uV (0.05~0.5 MHz, pre. OFF, 16dB S+N/N)
0.35 uV (0.5~30 MHz, pre. OFF, 16dB S+N/N)
SSB / ISB [2]0.56 uV (0.5~30 MHz, pre. OFF, 10dB S+N/N)
AM1.6 uV (0.5~30 MHz, pre. OFF, 10dB S+N/N)
Selectivity [3]
CW (300 Hz)0.35 KHz (-6dB)
0.45 KHz (-60dB)
SSB (3 KHz)3.0 KHz (-6dB)
3.8 KHz (-60dB)
IF filter ultimate attenuation [4]
80 dB
IF filter group-delay
< 0.1 ms (300~3050 Hz band)
RF preamplifier
Yes
NF (Noise Figure)
14 dB (preamplifier OFF)
11 dB (preamplifier ON)
DR (Dynamic Range) [4]
99 dB (20 KHz spaced signals, 14 MHz)
75 dB (5 KHz spaced signals, 14 MHz)
Blocking [4]
123 dB (100 KHz spaced signal, 14 MHz)
IP2 (2nd order intercept point)
+60 dBm
IP3 (3rd order intercept point)
+30 dBm (preamplifier OFF)
Image rejection
90 dB typ
IF rejection
> 85 dB (90 dB typ)
Spurious response
< 0.4 uV (referenced to RF input)
AGC (Automatic Gain Control)
Adjustable
Frequency stability
± 1ppm with temperature from 0°C to +50°C
Synthesizer settling time
10 ms
IF (Intermediate Frequency)
45.455 MHz
455 KHz
25 KHz
Features
Memory
100 regular memories
Display
1 Hz frequency resolution
Antenna
BNC 50Ω
Power supply
97 ~ 253 VAC
Power consumption
35 W typ
Audio power
1 W on 8Ω
Audio output
Jack 6.35 mm headphone
Connections
RS232C / RS485 / RS422 (remote control)
BNC (IF 455 KHz output)
BNC (monitor 455 KHz output, BW 8 KHz)
BNC (frequency reference input)
Terminal jack (audio)
Mechanical and environmental data
Operating temperature
from 0°C to +50°C
Dimensions
482 (W) x 133 (H) x 508 (D) mm
Weight
6.78kg

  1. 300 Hz bandwidth.
  2. 3200 Hz bandwidth.
  3. Standard values, 58 bandwidths are available between 0.056~8 KHz.
  4. This parameter, not in official data, was obtained with direct tests.
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WJ-1000A description :

The WJ-1000A was one of the first receivers for the amateur market to implement the SDR technology in hybrid form, ie. adopting a triple frequency conversion with the last digitized to perform the filter and demodulation functions. The equipment has professional characteristics both in terms of RF performance and reliability, the producer WJ in fact works in the military as well as in the civil sector, always linking its name to products of the highest quality. The receiver offers a lower frequency limit of only 5 KHz, although tuning can go down to zero under the operational aspect, thus covering even the lowest radio frequencies with substantially constant sensitivity and dynamics over the entire range. In fact, this model, starting from hundreds of KHz and up to the upper limit, guarantees a precision in the detection of the amplitude displayed by the S-meter. Equivalent to a measuring instrument with reading both in S points and in dBm. The AGC operates in analog and digital sections for a total of 100 dB, the response time is extremely rapid, taking 5 milliseconds while the release time is selectable between slow, medium and fast in the interval of 0.01 ~ 5 seconds so as to adapt to each type of emission. After the ADC conversion stage operating at 100 Ksps for 16 Bit a DSP processor is responsible for defining selectivity, with high attenuation slope bandpass filters, and making the PBT, notch, BFO adjustable functions available (within ±8 kHz in 10 Hz steps), multi-mode demodulation including also the ISB (independent side bands with two audio outputs) and the synchronous-AM.

The WJ1000A has 58 different bandwidths to choose from a minimum of 56 Hz to a maximum of 8 KHz, the form factor of the filters is always better than 1.5:1 at 6/60 dB. In the following table the nominal bandwidths referred to 3 dB:

Bandwidth
56 Hz113 Hz225 Hz450 Hz
63 Hz125 Hz250 Hz500 Hz
69 Hz138 Hz275 Hz550 Hz
75 Hz150 Hz300 Hz600 Hz
81 Hz163 Hz325 Hz650 Hz
88 Hz175 Hz350 Hz700 Hz
94 Hz188 Hz375 Hz750 Hz
100 Hz200 Hz400 Hz800 Hz
900 Hz1800 Hz3600 Hz7200 Hz
1000 Hz2000 Hz4000 Hz8000 Hz
1100 Hz2200 Hz4400 Hz
1200 Hz2400 Hz4800 Hz
1300 Hz2600 Hz5200 Hz
1400 Hz2800 Hz5600 Hz
1500 Hz3000 Hz6000 Hz
1600 Hz3200 Hz6400 Hz

The front-end module is characterized by excellent levels in IP2 and IP3 parameters, to change the dynamic range at the input you can insert a 10 dB preamplifier or a 15 dB attenuator. However, there is not a preselector stage that is only provided as an optional accessory (model HF-1000PRE), this integrates eleven preset bandpass cells with a width of less than one octave and can be switched off when necessary.

The internal clock uses a high stability TCXO with a maximum deviation of ±1 ppm for a temperature change of 50°C. An input is dedicated for an external master clock reference that accepts 1, 2, 5 or 10 MHz signal. The receiver automatically adopts this reference and detects its presence. The audio is usable for loudspeakers, headphones and via fixed-level outputs on 600Ω for connection to recording systems. The volume control is also separate for audio intended for the speaker and headphones. Two the IF outputs both at 455 KHz but with different bandwidth, this makes it possible to connect instruments that display the spectrum around the tuned frequency or even specific demodulators that make use of the selectivity determined by the user. A multi-standard interface on a 25-pin connector with baud rates of 75 ~ 9600 bps allows remote use of the WJ-1000A. The apparatus has standard size measurements so as to be possibly mounted in a 19-inch rack.

WJ-1000A performance and practical notes :

Certainly the WJ1000 is a superior class receiver for reliability and repeatability in performance, it is also taken care of in every detail both in terms of electronics and mechanics. Being born in the first half of the 90s this Watkins-Johnson (WJ) model inevitably suffers from some weaknesses when compared to the recent SDR, more flexible on some aspects, but nevertheless expresses an ergonomic that perfectly fit the needs of the operators who prefer a traditional front panel instead of the combination of monitor and mouse. It should be noted that the receiver is in practice the version for the civil market, with few but significant variations, of the WJ-8711A model of the same manufacturer. Apparatus that was originally intended solely for military and government users.

WJ-1000A review

Sensitivity
Selectivity
Dynamic range
Spurious response
Audio
Signal functions
Control functions
User friendly
Stars: 1=insufficient | 2=just sufficient | 3=mediocre | 4=good | 5=excellent


F8FFV

Have bought and tried so many receivers and went for the HF1000 from WJ last year. Un-be-lie-va-ble what small signals you can pull and with such a low noise. It really blasted away my Icom R-9000 I was so proud of until then.

[End post]


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