Equipment information

Lafayette HA-350 Receiver
Model HA-350
Date 1964
Category: Radio, Communication
Group Receiver
                                    The Lafayette Model HA-350 is a dual-conversion
superheterodyne communications receiver covering the 80, 40,
20, 15 and 10 meter amateur bands with provision for tuning
WWV on 15 Me. The receiver provides for the reception of CW
(code), AM voice and SSB signals. During SSB operation,
either the upper or lower sideband may be readily selected
by means of a front panel control, a feature that greatly
simplifies tuning of these signals.
The receiver employs dual-conversion on all bands (except 80
meters) and thus offers high image rejection. A
crystal-controlled first conversion oscillator and a
VFO-type second conversion oscillator ensure extreme
accuracy and stability. Tuned RF and 1st mixer stages
(Preselector) assure maximum sensitivity and a high
signal-to-noise ratio. A 455 Kc mechanical filter plus two
IF stages provide a high degree of selectivity — bandwidth
is 2Kc at 6 db down, 6 Kc at 60 db down. A product detector
operating with a crystal-controlled BFO is employed for
improved CW and Single Sideband operation, while a separate
diode detector is used for AM reception.
Tuning in this receiver is accomplished by a precision
vernier mechanism that operates smoothly without backlash or
other undesirable effects. The tuning method employed
permits high accuracy. A single tuning dial, calibrated in
kilocycles, is used to tune over all amateur
bands. For even greater accuracy, the receiver incorporates
a 100 Kc Crystal Calibrator circuit (crystal available as an
optional extra), plus a Calibration Reset control which
permits accurate calibration of the tuning dial at every 100
Kc point.
Other features include an “S” meter calibrated in “S” units
from 1 to 9 and in decibels above S9, RF Gain control,
Automatic Noise Limiter on AM, Receive-Send switch and a
full-time AVC circuit which is automatically set to provide
a characteristic most suitable for the mode of operation —
“standard” on 9M, “fast attack — slow decay” on CW and SSB.
The antenna input connector is of the coaxial type and is
designed for use with unbalanced lines of 50 to 75 ohms
impedance. The receiver has output terminals for connection
of 8 ohm speakers, plus provision for 500 ohm connections. A
front panel jack provides for headphone listening, the
insertion of a headphone plug automatically silencing any
speaker connected to the 8 ohm output terminal.
The receiver is designed to operate from an input power
source of 105-120 volts, 50/60 cycles AC, the power
transformer being fused in the primary for 2 amps. Full-wave
rectification is employed, using silicon rectifiers. A
voltage regulated B+ supply is provided for the BFO, 1st
Conversion Oscillator and 2nd Conversion Oscillator to
assure maximum stability.

These manuals are available for the above equipment:

Manual Type Service and User Manual Lafayette-7088-Manual-Page-1-Picture
Pages 16
Size 1.74 Mbytes (1824960 Bytes)
Language english
Manual-ID/Number 99-2524WX
Date 1964
Quality Scanned document, all readable.
Upload date
MD5 539a223e74ab3f90377812ac171623e3
Downloads 136 since 06 September 2015

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