Related Manuals for Heathkit SB-401
Summary of Contents for Heathkit SB-401
- Page 3 OCR, applied now searchable.
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Page 10: Carrier Generator Circuit Board
15vdc 350v... -
Page 12: Step-By -Step Assembly
R101 R103... - Page 13 R104 C103...
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Page 15: Chassis Parts Mounting
450v... - Page 41 C-81 350V...
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Page 75: Transformer Wiring
C81, axial leads... - Page 106 VTVM OR MODERN DMM...
- Page 107 ANY DMM WITH a min. 10Meg ohm input Z works. Tube V9 is not intalled until way later.
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Page 110: Alignment With
Tube V9 is removed in all tests until told otherwise. Any DMM with min. 10meg.ohm Input Z, or a scope will work in all tests below. any 100watt or more.. - Page 111 Using scope? see R27 connect to other side of it. This is CW mode and uses the LMO mixed with the HET oscillator. Any modern DMM or Scope with 10meg ohms min. input impedance "Z" or better. works. here.
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Page 112: 8.6 Megahertz Trap Adjustment
or DMM... - Page 120 As a minimum you will need Y1, Y8, Y9,10 and 11. to complete these steps. For sure the Y1 to 8 that you want to DX on. I'm adding step numbers to all major alignment steps. On my schematic , I put red stars and blue STARs, the red mean factory test points and my blue Stars are my SCOPE test points.
- Page 121 or modern DMM or scope or scope this shuts down the finals. V9 is removed THE BANDS WILL BE DEAD IF THE CRYSTAL IS MISSING STEP2 Still in CW mode Step 1, Het OSC. E pin is small coax pin. warning 800vdc present Key means the rear 1/4"...
- Page 122 IF the CW crystal is missing this will fail 4v P-P on scope ,tune STEP6 The Dummy load connected ! STEP3 This is final Grid Drive. STEP4 CW KEYED ! CW mode STEP5 V9 is main driver As much as 120v p-p at antenna too. Keep in mind all oscillators must work On 3.5mhz, pin2 V9 I got 10v p-p here or this signal will be wrong, there...
- Page 123 STEP7 Y7 is normally missing, mine is. Normally this crystal is missing, STEP9 STEP8 I had to find and buy this crystal...
- Page 124 watch the VM meter like a hawk, 0v STEP 10 SKIP NEXT 7 PARAGRAPHS IF BUILT Why is assembly here, oddly Best practice is to Chicken stick all main CAP, before touching wires or pins.
- Page 125 STEP 11 3.5000 exactly STEP 11 SKIP THESE 2 Small alum. knob at 2pm on dial. I forgo all this calib., as I have DDS , external VFO now. Use any modern receiver. All are its dead accurate out of the box. dead accurate, for this.
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Page 126: Frequency Shift Adjustment
STEP13 STEP 12 DONE... - Page 175 6.3vac -68v +150v...
- Page 177 450vdc...
- Page 180 350v axial dual...
- Page 183 Eg. SB200 PA amp...
- Page 184 HC6/u...