Re: Zx81
Possibly the connecting lead has an intermittent break in it, if so, this would usually be a break in the inner conductor of the lead just at the point of entry/exit to one of the plugs as that's where they tend to get bent around the most - also people have a bad habit of pulling them out by gripping the lead close to the plug and pulling, rather than gripping the body of the plug and pulling that.
Do you have an alternative aerial / RF lead you can try?
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