Note
Ham Radio, Dec 1978, p. 1.
The HF1030 communications receiver introduced by Communications Product Corporation is a fully synthesized, tunable, solid-state receiver that covers the frequency range from 10 kHz t o 30 MHz i n 10-Hz steps.
Designed by Dr. Ulrich L.Rohde, DJZLR, well known to ham radio readers for his many contributions to modern high-frequency receiver design, the HF1030 has many unusual features not previously available.
Included are frequency preset, remote control, and remote programmability - features which permit the receiver to be used in computer-based communications systems.
Other features of the HF1030 include provision for all reception modes (AM, SSB, and CW), 455-kHz output for FSK demodulation (FSK filter built in), selectable IF bandwidths, electronic bandpass tuning, and excellent immunity to strong-signal overload. The two selectable tuning speeds of the optical shaft encoder (1800 Hz and 180 Hz per 360° dial revolution) give the feel and smoothness of an analog VFO in quasi-continuous tuningwith absolutely backlash-free performance while retaining the accuracy and stability of the internal or external frequency standard.
No separate MHz control is required - the frequency may be preset with the thumbwheel switches, then returned to VFO control; the fast-switching synthesizer permits frequency jumps of 30 MHz in less than 10 milliseconds.
All internal frequency control, including the BFO, is derived from a master crystal standard; worst case frequency stability for the oscillator is 1 Hz/ºC. For more demanding stability requirements, there is provision for an external rubidium or cesium standard. The fully synthesized BFO provides a ±5 kHz tuning range.
Almost all frequency synthesizer circuitry is based on CMOS circuits; this reduces power consumption to less than 2 watts and enhances reliability because of heat reduction. Spectral purity of the synthesizer is improved because of the great reduction of digital noise. The CMOS memories and standby battery provide storage of frequency data for at least one year in the event of
power failures; upon restoration of power, the receiver will return to the previously tuned frequency.
The HF1030 receiver uses a specially developed, high-level double-balanced mixer with monolithic hot-carrier diodes, which is terminated in a low-noise amplifier with heavy feed- back for excellent sensitivity without any requirement for an RF amplifier. Sensitivity on CW, FSK, and SSB is typically 0.5 uV for 10 dB signal-to-noise ratio; AM sensitivity is 2.6 uV typical for 10 dB S/N. The noise figure is less than 10 dB from 1–30 MHz.
The third-order input intercept point is +20 dBm (signals separated 30 kHz); second-order IMD is –80 dB.
The first HF of the HF1030 is at 40.455 MHz; the second IF is at 455 kHz. To improve input selectivity the 8-pole 40.455-MHz crystal filter has a bandwidth of ±4 kHz with a 1:2 shape factor; this filter was designed specifically for low intermodulation distortion products.
The five built-in 455-kHz IF filters have been specially selected for optimum performance on SSB (2.7 kHz), CW (375 Hz), FSK (1.9 kHz), and AM (5.8 kHz).
The built-in bandpass tuning feature (controlled by the main tuning knob) is accomplished by electronically shifting the frequencies of the LO and BFO.
The AGC system used in the HF1030 receiver has a minimum range of 120 dB with a threshold at 0.2 uV; there is less than 6 dB audio change with RF inputs from 1 uV to 100 mV. On SSB, the AGC attack time is 100 ms; hold time is 1.6 seconds and release time is 50 ms (typical). For AM reception, AGC attack time is 10 ms; release time is 35 ms.
Other features of the HF1030 include a effective squelch system which discriminates between man-made noise or electrical noise and voice or other wanted transmissions.
The receiver uses modular construction with easy access to all assemblies; its compact size allows two HF1030 receivers to be mounted side by side in a single rack panel.
Power consumption: (all LED displays on) is less than 15 watts.
Power requirement: 110/220 VAC, 47-400 Hz at 25 watts, or 15 to 25 VDC at 1 amp.
Sold by Rohde & Schwarz