[clug] Microwave/Wireless - DTV Overload
neilp at goldweb.com.au
Sat Feb 5 02:30:05 GMT 2005
In these days of receivers with almost no RF components it is easier to
get broadband VHF/UHF tuning by mixing up to a higher IF rather than
building 3 separate front end RF mixing stages for the various bands and
mixing down to a low first IF. These receivers are usually a double
superhettrodyne and the second IF will be at a more normal frequency.
Analog RF circuits and bits of bent metal cost lots more than integrated
digital processing. It's all aimed at saving cents in production cost.
Michael Carden wrote:
> On Friday, February 4, 2005, at 06:05 PM, Brad Hards wrote:
>> Huh? If the highest RF is 800MHz, how do you get 1200MHz IF?
> Not that it has any real bearing on the topic under discussion, but some
> receivers *are* designed to have a first IF frequency that's higher than
> the desired tuned frequency. Not at all likely in this case in my humble
> opinion, but an interesting permutation of receiver design nonetheless.
> MC - variously a VK3, VK2 and VK1 something in the pre-internet days
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