I’ve built a lot of crystal radios but this one still works the best due to careful antenna – diode – headset impedance matching. A crystal radio would have been very handy at that point.įun times – I still have the CR-1 and it still works great although the H-43/U headset shown above is not original. The transmitting sites would change every several minutes as they broadcast emergency information messages. Measures taken by the USG to prevent Soviet bombers from homing in on our AM broadcast transmitters as the Imperial Japanese Navy did during the attack on Pearl Harbor.
These markings were required on all radio receivers built between 19, including this one. Those little CD (Civil Defense) markings were the frequencies set aside (6 KC) in the AM broadcast band for CONELRAD alert messages. Note the markings on the right-hand “DET” dial.
Wrong….(I learned after looking through a Heathkit catalog that that feat would require a radio TRANSMITTER! I would drool over actual transmitters in the catalog that could do this – like the DX-100 which I would eventually own).
