Notes etc for Hendricks Tracer/Injector Kit
Note: This information is sourced from the QRP Kits website: The Hendricks Tracer/Injector probe is used to diagnose amplifiers, receivers and transmitters. It incorporates an LM358N, integrated circuit, half of which is the audio signal injector and the other half a tracer, incorporating a product detector to allow you to locate problem stages. With this tool you can inject audio signals through the various stages of your problem circuit, or trace signals from the front end thus narrowing in on the problem. It is a completely self contained, handheld device, using an inexpensive readily available battery.
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Hello
What s the price of your signal tracer +shipping to France ?73
Hi there,
The QRPKits Signal Tracer / Injector is sold by Hendricks QRPKits. I’ll have to make this page look less like an advertisement!
Full details of the device and cost – curently US$35 – can be found at http://www.qrpkits.com/tracerinjector.html.
Their Orders page at http://www.qrpkits.com/ordering.html details their shipping charge for DX orders is US$15.
Can this unit be used to inject and trace a signal in an FM receiver ?
Will this injector/tracer withstand the say 300 VDC bias voltages in a vacuum tube circuit?
I once built something very similar in function which used 2 transistors and not much besides in a similar feedback arrangement to the LM358 internals – it used 2 AA’s . It also required a crystal earpiece (incidentally part of the RF rejection feedback). Anyone out there recall seeing the design, I lost mine. I’m not saying Hendriks has not done a good job here, it’s just I built this in the 1980′s.