Shows the VFO Amplifier to Crystal Filter IR Path covered with tubing.
Tests with colored tubing besides black has shown that only black tubing is effective blocking visible and Infra-red energy.
|Shows how the Bandpass to VFO IR circuit is covered with tubing. A notch is cut out of the bottom of the tube at the Photodiode side so the tube can slip all the way over the Photodiode.
Shows positioning of Photodiode and IRED at the VFO.
Shows the use of Optic cable & Commercial IR devices.
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