Drake 2-LF Upconverter for Drake 2B
I never knew about this Drake accessory for the 2B receiver:
The 2-LF allows listening to LF and broadcast AM and optionally to 160 meters on the three 10 meter band segments of the 2B.
I used to have a Drake 2A but gave it away, a well made radio, not so sure about the design: triple conversion, tubes including the pentagrid converter from the All American 5 - I always had trouble with the AGC - also had trouble adding other coverage segments (might have been bad crystals).
The 2-LF seems to have been for the Drake 2B (similar but better than the 2A), not sure if they changed the calibrator socket between the 2A and 2B.
The 2-LF is an interesting design, a simple one section low pass filter (which would be fine considering the up conversion to 10 meters), a diode mixer driven by a single transistor crystal oscillator.
Not quite sure of the time frame, the 2-B was 1961 so I picked 1964 (60 years ago, really ?) and got an inflated price of 10x:
I'm going to have to try building something similar and see how it works. With a 28 MHz crystal it would go below 100 kHz.
Best Regards,
Chuck, WB9KZY
http://wb9kzy.com/ham.htm
The 2-LF allows listening to LF and broadcast AM and optionally to 160 meters on the three 10 meter band segments of the 2B.
I used to have a Drake 2A but gave it away, a well made radio, not so sure about the design: triple conversion, tubes including the pentagrid converter from the All American 5 - I always had trouble with the AGC - also had trouble adding other coverage segments (might have been bad crystals).
The 2-LF seems to have been for the Drake 2B (similar but better than the 2A), not sure if they changed the calibrator socket between the 2A and 2B.
The 2-LF is an interesting design, a simple one section low pass filter (which would be fine considering the up conversion to 10 meters), a diode mixer driven by a single transistor crystal oscillator.
Not quite sure of the time frame, the 2-B was 1961 so I picked 1964 (60 years ago, really ?) and got an inflated price of 10x:
I'm going to have to try building something similar and see how it works. With a 28 MHz crystal it would go below 100 kHz.
Best Regards,
Chuck, WB9KZY
http://wb9kzy.com/ham.htm
