Re: Spectrum advice
What's the model number on the modulator? The standard UK channel 36 modulator was an Astec UM1233. I'd expect a VHF one to be different.
If you have the facilities, you might also try taking the composite video signal from the input to the modulator. If that's still noisy, you know you have a problem elsewhere.
Regarding the mess on the screen, that looks like faulty RAM to me, but I'm not a Spectrum specialist.
Chris
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