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How to test a crystal in circuit with oscilloscope Vintage Hammarlund HQ-129X shortwave receiver
Автор: D-lab Electronics
Загружено: 2021-05-26
Просмотров: 4878
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Here is a nitchy Tech Tip for you. I had an old HQ-129X receiver arrive with inop Crystal selectivity. Normally due to the value of these receivers, most do not pursue a pricy repair. This turned out as a bad connection on the crystal. Fairly easy to repair and inexpensive. So, I saw this as an opportunity to demonstrate a quick crystal testing method. I do not perform this often, but when necessary it is a easy setup. If you look up this subject on the web, most say you must remove the crystal, not true, it can be verified in circuit.
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