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AGC signal/noise question...
wrote: On Fri, 18 Aug 2006 19:54:00 +0200, "i3hev, mario held" wrote: Michael Black wrote: However be wary of ICs like the MC1350 as the gain reduction occurs the internal noise is bad. I've built several recievers using this part and at ~10db gain reduction the noise jumps way up. I've gone to cascode JFETs as the noise is more predictable and generally lower. The device used does make a difference. Allison I have to disagree on the MC1350 and way back 30 years to its predecessor, MC1590. The prototype HF receiver presently on my workbench has a NF of 5.5 and that hardly rises more than that with AGC current applied to the AGC pin. BTW, that receiver, single-conversion with one IF at 21.4 MHz, uses only MC1350s up to the detector, including the one mixer stage. [ LO is a separate PLL board ] |
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