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Just curious... does anyone know what sort of architecture you find in your
typical HT or mobile "receives everything from 100kHz - 1.3GHz!" radio to generate such a vast range of frequencies while still keeping the prices so low (plenty are available for $200, and I can't expect the LO makes up a particularly large percentage of that total price)? I would tend to lean towards something PLL-based given the typically channelized nature of available frequencies, but a single PLL would still need a VCO with a huge tuning range. So... perhaps a pair of mixed PLLs, with one doing the fine tuning and another the coarse tuning (having been multiplied up from a low frequency)? I attempted to decipher the schematic included with my Yaesu FTM-10R, but everything is so tiny it was rather hopeless! I don't suppose any of the reviews ever go through and sweep the LOs while watching for the worst case spur conditions, do they? ---Joel |
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