Pete and co You are wandering away from the subject. My question was not on the merits of detectors etc, simply how to build a razor blade detector and suitable earphone using scrap parts available i
No problem! Use MCW! Has been typical for 500 kHz. 73 DJ1ZB "M0FMT" <[email protected]> schrieb: Hi Mal and LF I am disapointed in you Mal to be considering an envelope detector. A true CW man, I wou
Mal, I have done it when I was 14 years old, it is not that difficult and is described in books and on the web. What is the point that I (or others) have to prove to you that we know ? Or do I have t
MCW: what a waste of bandwidth, Mal will allert OFCOM ! 73, Rik ON7YD - OR7T At 00:42 7/01/2009, you wrote: No problem! Use MCW! Has been typical for 500 kHz. 73 DJ1ZB "M0FMT" <[email protected]> sch
Hi Rik and LF But that's the point, an envelope detector will not detect CW (ON / OFF Keying) unless A/ you have a local oscillator (DC rx) to create a beat in the detector, added complication in des
It seems everyone is MISSING THE POINT. I want someone to describe how to make RX using a RAZOR blade detector and also how to make the HEADPHONE needed to hear the signal, using the sort of componen
Ah yes, the coherer, worked for me during a reconstruction of the W1AA/Marconi event... But lets give credit to latter day technology as well and the Liquid Beretta, that truly sensitive with all AM
Hi Hajo and LF But you still have the issue of Hi Impedance headphones. A Coherer allows you to switch a light or buzzer on and off. They are amazing in free state they have a very high DC resistance
Hi Mal and LF I am disapointed in you Mal to be considering an envelope detector. A true CW man, I would have thought, should only entertain the use of a Cohere detector! Having played with them, I w
