It sounds like you’re searching for a free PDF of Communication Systems by Singh & Sapre, possibly referring to a specific edition, page, or problem number (“89 better” might mean problem 2.89, a better explanation, or an improved scan).
At the heart of the ledger, in a copper box welded shut, they found a stack of punched tape, brittle but intact. The punch holes matched the signal they’d been intercepting. Aman and Meera fed the tape into a repaired reader. As the machine clattered and the tape unspooled, voices poured into the room — elders recounting festivals, fishermen’s maps of hidden shoals, the cadences of songs that had never been written down. Lines of dialog, recipes, first names long forgotten in official records: a living history encoded in the language of circuits. singh and sapre communication system pdf free 89 better
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Digital Communications (PCM, Data Transmission, and Spread-Spectrum). The Problem: Searching a 500-page PDF for "signal
