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K18V2. FM TRANSMITTER
Source: kitsrus.com
File Size: 113.31 KB
Category: Telecommunications
Last Download : 33 days 7 hours 22 minutes ago
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Short Description: frequency stable transmitter. The output level (around. 2.5mW) and range are therefore somewhat .... Normally the output of the transmitter should be ...
Content Inside: K18V2. FM TRANSMITTER This is an improved kit 18. At first sight it looks The frequency determining elements (L1, C5 and C6) similar to the original Kit 18 – especially the inductor form a simple LC tuned oscillator. The inherent etched onto the PCB – but it has been tinkered with by problem with this type of circuit is that any external Harry Lythall in Sweden to give the best distance and load (antenna) will change the operating frequency. stability for its size. This is normal. If the antenna load is heavy then the transmitter could be moved off frequency by 1MHz, or The battery supply rails have been well tied together perhaps even more. with respect to radio frequencies (C1, C2 and C7.) The tracks are also thicker. This makes the circuit a single The tuned coil, L1, has two output tappings for the ‘solid’ block eliminating RF currents in different parts antenna connection, marked "A" and "B". These are of the circuit. This also means the battery no longer has both low-level outputs and you choose which tapping RF on it which makes the whole unit a lot more you want to use.
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