27-10-2020, 04:37 PM
Hi Amie.
Sorry for stealing your thread and if the mods think that this should be split then it could be a good idea.
This circuit has just a couple of small mods that have improved things no end. The 15k damping resistor across the RFC is not required and improves output no end especially on weak stations, the addition of the second diode as a doubler improves volume again on weaker stations. The biggest improvement is just a length of wire. It goes from the AF116 collector and is left in close proximity to the aerial coil inducing some feedback, it works best between 1600khz and 750khz then tails off. No adjustment other than spacing is required. Tacking in a big out put tx and speaker gives ample volume to fill a room, much improved quality too.
Sorry for stealing your thread and if the mods think that this should be split then it could be a good idea.
This circuit has just a couple of small mods that have improved things no end. The 15k damping resistor across the RFC is not required and improves output no end especially on weak stations, the addition of the second diode as a doubler improves volume again on weaker stations. The biggest improvement is just a length of wire. It goes from the AF116 collector and is left in close proximity to the aerial coil inducing some feedback, it works best between 1600khz and 750khz then tails off. No adjustment other than spacing is required. Tacking in a big out put tx and speaker gives ample volume to fill a room, much improved quality too.
