HEATHKIT SB-104 MANUAL PDF

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The wire is power and audioall in one wire. A scope, is mandatory, as only a scope can tell you if you are reading just a bunch in noise, hopeless or a real signal and clean. Failure cures for parts no longer made or sold.

Heathkit SB, HW, SBA Web Site

Capturing multiplexed display on camera is tricky see next photo. I will only modify mod. No squelch knob or tone controls for audio. Looking for other manual? The Web Schematic A. C is the DC blocking cap. Do not attempt to re clamp for change the ball clamps in the Jackson drives, just clean them and grease them. Current roll back, more than a silly fuse.?

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Mabual hits, heatthkit them? Best is no socket at all, to keep leads short and parasitic inductances low. Test the rig in to a dummy load, the attempt to use low power into the antenna feed line, see if you get crazy high SWR, if yes, stopfix that now. Just the huge caps.

The TX currents do not run through this node sois easy to regulate. You can in fact mix some 74xxxx logic families.

Heathkit HW-104 Manual

Inspect inside the gear for any thing loose do not power it up if any coax cables on the right cards are loosefell off or are missing. Once aligned the Receiver works perfect, using a real antenna.

This rig runs on Bulletin fixes and mine The stock 14v power supply is here. Best is to find standard sizes like.

I Got one more fix. Do not key up the transmitter, with the rear Antenna feed line missing. I use only Alcohol. This text file covers common problems and solutions to each. It can be a blessing.

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No more brown phenolic shabby PCB cards, but now real quality fiber glass boards with silk screen markings and back side solder masked, OMG. Do you own bench testing first. Do not touch the 4 pin card!

My Heathkit SB restoration by K5JXH

Be sure the card number matches. What to avoid is easy. Every ground tab that is on a screw on the bottom,needs to be tight. The blue cap is metal film.