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Old 30th Nov 2017, 2:41 pm   #7
colourking
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Join Date: Nov 2007
Location: Cork, Ireland
Posts: 134
Default Re: Another Tesco radio.

Quote:
Originally Posted by Andrew2 View Post
On FM the story is similar. Poor gain, noises off and generally irritatingly bad. Again no filtering hardware and I couldn't find a LO signal.
With other similar radios on FM (having 'low-IF'), the Local Oscillator is approximately just 0.125kHz either above or below the received frequency.

So for example tuned to a station on 100.0 MHz, the LO is likely on approx either 100.125 or 99.875 MHz

Very little leaks out, but a narrowband receiver, such as a scanner in NFM mode, will likely receive the LO carrier holding it close to the radio (I found on a similar radio - the Tesco RAD108, the 4th harmonic of the LO could be detectable over a significantly greater distance).

Last edited by colourking; 30th Nov 2017 at 2:55 pm.
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