The Heathkit HW-32A 20 Meter Transceiver - Nostalgic Kits Central

6EA8 is used as an rf amplifier. The triodesection mixes the input signal with the VFOto provide an output at the 2304 kHz if.This com bination results in a sensitivity of1 /LV for a 15 dB signal-plus-noise to noiseratio.The four-crystal crystal filter following themixer exhibits 2.7 kHz selectivity at the 6 dBpoints and 6 kHz selectivity at 50 dB down.Two 6AU6 if amplifiers, a 12AT7 productdectector and a 6EB8 audio amplifier andpower stage complete the t ube lineup in the•receiver.A 6EA8 microphone amplifier and cathodefollower in the transmitter drive a diode typebalanced modulator. The output of the balancedmodulator is amplified by a 6EA8transmitting if amplifier before the signal isfed into the crystal filter. From the crystalfilter the signal is amplified by another if amplifier,a 6AU6, and then mixed with theVFO signal in a BEA8 mixer stage. In thefinal a 12flY7 driver stage pushes a pair of6GE,5's to 200 watts PEP input.The Heath single-band transceivers may beswitched from transmit to receive b y eitherpush-to-talk or the built-in VOX circuitry.The 6AU6 VOX amplifier is normally operatedin a saturated cond ition, but whenaudio is applied to the grid, the plate voltagerises and fires a neon bulb, providing positiveswitching action. The voltage from theNE-2 neon is amplified by the relay amplifier,the triode section of a BEA8, which operatesthe transmit/receive relay. The builtinantitrip circuitry and VOX delay result invery smooth VOX operation. Tbe VOX delayand VOX sensitivity controls are located onthe rear panel where they are easily accessibleduring initial VOX ad justments; afterthat they may be virtually forgotten.A 6AU6 is used in a Colpitts type VFO.circuit and the stability characteristics areexcellent. The circuit is completely temperaturecompensated and after a warmup of.30 minutes, the drift is less than 200 Hz perhour. To a large degree, the stability anddrift characteristics of this VFO are directlyattributable to its relatively low frequencyof operation-1618.3 to 1771.7 kHz. TheVFO output is mixed with the output froma crystal controlled heterodyne oscillator toobtain the required mixing signal for 20meter operation.The back-lighted d ial i-, very srnooth-.much smoother than some transceivers 1have used cosfi nj; several times ••s much Thetwo kHz dial calibration is very convenientand when used with the optional crystalcalibrator, you know exactly where you'reoperating without a lot of interpolation. Inthese new single-banders the crystal calibratorsocket is built in and the calibratoris controlled from the front panel- all youhave to do is build the calibrator.Construction of the HW-series single-bandersis simplified by the use of a printed circuitboard and a factory-prepared wiringharness. In fact, over 90% of the componentsare mounted on the printed circuit board.With this type of construction, assembly timeis drastically reduced and wiring errors arealmost non-existent. With the extensive directionsand pictorial layouts provided inthe assembly manual, wiring proceedssmoothly and rapidly. Even the alignmentis no problem-all you need is a broadcastreceiver, a VTVM with an rf probe and aSelectivity :Heathkit "\V-32A SpecificationsSpu riOU I responses :Carrier su pp ression:RF power input:Antenna impedance :Frequency st a bility :Tube llneup rAeeeseortes rErequeney coverage: 14.2 t o 14.36 MHz.Sl.'nsitivity: 1 p V for 16 dB sign a l-p lusnoiset o noise.2.7 k Hz at 6 dB; 6 kHz at50 d B.Ima ge rejection. 60 dB; Urej ection, 65 dB.45 dB below peak output(min imum).Sideband sup p ression : 45 d B below p eak outp utwit h 1000 H z modulation(m inimum).200 w at ts PEP.50 oh ms n ominal.Less than 200 H 2Oper hou rnfter war mup.Select able u pper or lowereideband, external aut o-matic level control (A LC).VOX, improved audio a ndAV C circuitry.BEAS m icr ophone amplifierand cathode follower, t r a nsmitter if a m p lif ier a n d relaya mplifier, and rf emplifier-a nd r eceiver mixer jfjAU 6 VFO, VOX a m p lifier, if a m p lifiers, a n dtra nsm itter m ixer ; 6BE6VFO c a t h o d e follower,12A T7 product detector a ndcarrier oscillat or, GEBSa udio a mplif ier a nd audiooutput. 12 BY7 d river and6GE5fier.(2) r f power a m pli_H P -13 DC power supply.H P-23 A C power supply,H S·24 m obile speaker andBRA- I O-l 100 klb crystalcalibrator.Power requ fremerrts i 12.6 volts a t 3.75 amps.800 vae at 100 mA, 250Vdc a t 100 rnA a nd -130Slse and weight:Vdc at 6 rn A.6lA " x 12 JU" x 10" . 12 lbs.5104.95.103