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Hello!
Many people of a certain age will have known the Philips EE (Electronic Experimentation / Electronic Engineer) kits. I am still actively using them, and designed and built a VLF/LF receiver with it for the range 15.6 – 80 kHz, and thus including SAQ. It is a Direct Conversion receiver where the frequency is provided by a simple microcontroller. Below is a picture of my implementation, and here follows the link to all the details: A Philips EE VLF receiver (16 – 80 kHz) with digital control. Maybe the design provides soem guidance for others in this field …
/Jurjen
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This made my day and really brings back memories! Well done and thank you!
I can remember building (from this type of Philips kit) (60 years ago) a simple Long Wave radio. Back then in the UK Radio 2 (the Light programme) was transmitted on 200KHz 1500m. I built this simple radio into a small homemade wooden box and used it regularly for a few years. I think the RF transistor was an AF116 the front end was just a tuned circuit. The simple audio amp was I think two AC126 feeding a small loudspeaker.
On the front of the wooden box there were two of the (thinking back now – iconic) Philips kit red plastic pointer knobs, one for volume and one to tweak the tuning if ever needed.