Heathkit Hw 100
- Heathkit HW-100 - Restored!
- Heathkit hw 100 manual
- 'Hot Water' HW-100 Amat TRX Heathkit Brand, Heath Co.; Bento
These screws should be tight to the chassis and to the circuit board. Be sure lockwashers are against the foil side of the boards for good grounding. The enclosed relays used in this unit should be troublefree for years of normal use. DO NOT REMOVE ANY OF THE TUBES OR PILOT LAMPS WITH POWER APPLIED TO THE UNITS. Because of the series-parallel filament circuit arrangement, removing a tube with power applied may destroy other tubes due to an increase in filament currentthrough them. RF Voltage Servicing 0n the Schematic at the end of this Manual, the symbol CD encloses a number indicating the RF voltage at that point. Most of these symbols are found near the top of the Schematic, although others will be observed near V16, the VFO out- put, V198, and the antenna output. Page 141 RF voltages are shown at the grid and plate of. most tubes carrying RF so you can determine whether the problem lies in the grid or theplate circuit. A Heathkit 11 megohm input voltmeter with a Heathkit RF probe was used to measure the RF voltages.
Heathkit HW-100 - Restored!
Heathkit hw 100 manual
When the audio signal from cathode follower VlB and the RF signal from carrier oscillator V16 are applied to this balanced modulator, two additional frequencies are produced: one is equal to the sum of the audio and carrier frequencies; and the other is equal to the difference between them. These sum and difference frequencies are the upper and lower sidebands; and only these upper and lower sideband signals appear at the output of the balanced modulator circuit. The 3393. 6 kHz LSB carrier oscillator signal is applied through capacitor C16 and across a bridge circuit that consists of the Carrier Null control, resistors R15 and R17, anddiodes CR1, CR2, CR3 and CR4 of the modulator diode ring. The carrier signal is balanced out by the Carrier Null control and the Carrier Null capacitor: so there is no output signal from this circuit (until audio signal is applied). The audio signal that is coupled to diodes CR1, CR2, CR3, and CR4 from cathode follower VlB unbalances the modulator at an audio rate, causing the sum and difference sideband fre- quencies to appear at the output of balanced modulator transformer T1.
'Hot Water' HW-100 Amat TRX Heathkit Brand, Heath Co.; Bento
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- Heathkit HW-100 - Restored!
A fixed negative bias is applied to the grids of these tubes through resistor R916 and choke L903. This bias limits zero—signal plate current. 3+ is removed from the screen grids under receive conditions, by lugs '7 and 11 of relay RLZ to reduce the plate current to zero and cut off the tubes. RF driving voltage is developed across RF choke L903. Plate voltage is shunt fed through RF choke L901. For the LSB and USB modes of operation, the peak driving voltage is controlled by the Mic- rophone level control (in the grid circuit of V113) and the limiting action of the ALC (auto— matic level control) voltage. This ALC voltage is fed back to isolation amplifier V2 and IF amplifier V3. The output signal from V8 and V9 is coupled through RF parasitic chokes L904 and L902 and through capacitor C915 to the final tuning ca- pacitor C925 and plate tank coils L905 and L906. The parasitic chokes eliminate any tendency toward VHF parasitic oscillation. Wafer SE of the Band switch connects the proper portion of the plate tank coil in the circuit for each band by shorting out the unused section.