This month's theme tune:
The Wombles - Wombling Song - YouTube
The latest experiment involves testing the first prototype of what will either be the first or second amplification stage depending on whether modulation is required. The transmitter is connected to earth via the radiator pipe. The old CRI secondary is used as a test receiver, with a very experimental "extra coil" just for test purposes which is a basic long cylinder "Tesla coil" secondary of no particular wire length that relates to this experiment. The CRI (receiver) secondary connects to the radiator pipe at the same point as the transmitter. A flat spiral coil is also used as a second test receiver, which is connected to the earth terminal on the bench, which is plugged into the nearest mains socket (only earth prong of plug used). Test circuit supply voltage = +/- 10.9V, output approx 19Vp/p, approx 90mA = approx 990mW (not power factor corrected).
The flat spiral receiver being connected to a different earth point altogether, the near field receiving effects can be somewhat ruled out as there is no reception without the earth connection, nor is there any reception when the transmitter is disconnected from the radiator pipe. The coils will need to be taken outside to better compare the new circuit with the old amplifier, although this circuit isn't intended to be the final stage and it will be tweaked since this is the first test run of the first version, but results are not bad so far. This stage is mainly for better voltage (gain) control over the final output which will be a maximum of +/- 15V with this method. The electronics are also not yet being affected by the coil(s) which is also a pleasing outcome.
TMT With New Circuit Prototype Test Run-01 - YouTube
The Wombles - Wombling Song - YouTube
The latest experiment involves testing the first prototype of what will either be the first or second amplification stage depending on whether modulation is required. The transmitter is connected to earth via the radiator pipe. The old CRI secondary is used as a test receiver, with a very experimental "extra coil" just for test purposes which is a basic long cylinder "Tesla coil" secondary of no particular wire length that relates to this experiment. The CRI (receiver) secondary connects to the radiator pipe at the same point as the transmitter. A flat spiral coil is also used as a second test receiver, which is connected to the earth terminal on the bench, which is plugged into the nearest mains socket (only earth prong of plug used). Test circuit supply voltage = +/- 10.9V, output approx 19Vp/p, approx 90mA = approx 990mW (not power factor corrected).
The flat spiral receiver being connected to a different earth point altogether, the near field receiving effects can be somewhat ruled out as there is no reception without the earth connection, nor is there any reception when the transmitter is disconnected from the radiator pipe. The coils will need to be taken outside to better compare the new circuit with the old amplifier, although this circuit isn't intended to be the final stage and it will be tweaked since this is the first test run of the first version, but results are not bad so far. This stage is mainly for better voltage (gain) control over the final output which will be a maximum of +/- 15V with this method. The electronics are also not yet being affected by the coil(s) which is also a pleasing outcome.
TMT With New Circuit Prototype Test Run-01 - YouTube
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