dr_peppers
Newbie
- Joined
- Aug 13, 2017
- Messages
- 3
Hi Guys.
Not exactly lw, this is very long wave.
I built a version of wilfried fritz's Vlf receiver as found on vlf.it, I dont know if anyone here has any experience of one of these.
I'm finding it difficult to get the thing to work, I got the Lo to oscillate from around 400kc to about 650kc, so thats ok, then I tuned the Bfo so that the ceramic filter will pass it and generate a tone on receiving a Cw signal.
I also checked the audio bandpass filter with my sig gen, it performs as expected.
I used a J310 in place of the Bf966, and biased it slightly differently.
The problem is the circuit is as deaf as a post, I eve took the thing out in the fields to try it, same difference.
Anyone else any ideas.
Yes I'm new here.
Not exactly lw, this is very long wave.
I built a version of wilfried fritz's Vlf receiver as found on vlf.it, I dont know if anyone here has any experience of one of these.
I'm finding it difficult to get the thing to work, I got the Lo to oscillate from around 400kc to about 650kc, so thats ok, then I tuned the Bfo so that the ceramic filter will pass it and generate a tone on receiving a Cw signal.
I also checked the audio bandpass filter with my sig gen, it performs as expected.
I used a J310 in place of the Bf966, and biased it slightly differently.
The problem is the circuit is as deaf as a post, I eve took the thing out in the fields to try it, same difference.
Anyone else any ideas.
Yes I'm new here.