25-09-2016, 11:00 AM
Thanks for replies. I have never seen the tuning arrangement that I have used in this circuit before before. What it should have been, was the grid of V1 going to the right hand side of L2! Yes, the coupling method from V2 to V3 was the only way I could get it to work properly.
If an RF peak capacitor is the same as aerial trimmer, I am familiar with it, but have only used it is short wave sets. The fixed aerial capacitor was OK for this MW set. It is very selective and the volume and tone are excellent.
I have heard of Miller effect and wondered if my strange RF tuning was acting as some sort of neutralising circuit. I did know all about that sort of thing long, long ago, but seldom bother with too much theory these days.
This receiver was a very untidy affair during the design stages. (See attached image) My use of RF chokes (47uH) for tuning, and 100uH for reaction is generally frowned on, but I can't normally be bothered winding real ones, although I have done from time to time. I have even built superhets using chokes as coils and they work fine. No good for short wave though, but winding a short-wave coil is no probalem anyway!
The coil screening cans are stainless steel salt sellers that I got from a car boot sale. They are only for show, and not even earthed. Earthing them made no difference.
I am not especially into regenerative sets, in fact I don't do a lot of radio, but every so often, I will suddenly get the urge to build something, and go at it like mad until it is working and then subside into reduced interest again.
My recent dismantling and cataloging of all my bits and pieces accumlated over the past 60 years has suddenly made available to me hundreds of parts that I had forgotten I had, and I also found it very theraputic, as well as gaining a lot of space.
If an RF peak capacitor is the same as aerial trimmer, I am familiar with it, but have only used it is short wave sets. The fixed aerial capacitor was OK for this MW set. It is very selective and the volume and tone are excellent.
I have heard of Miller effect and wondered if my strange RF tuning was acting as some sort of neutralising circuit. I did know all about that sort of thing long, long ago, but seldom bother with too much theory these days.
This receiver was a very untidy affair during the design stages. (See attached image) My use of RF chokes (47uH) for tuning, and 100uH for reaction is generally frowned on, but I can't normally be bothered winding real ones, although I have done from time to time. I have even built superhets using chokes as coils and they work fine. No good for short wave though, but winding a short-wave coil is no probalem anyway!
The coil screening cans are stainless steel salt sellers that I got from a car boot sale. They are only for show, and not even earthed. Earthing them made no difference.
I am not especially into regenerative sets, in fact I don't do a lot of radio, but every so often, I will suddenly get the urge to build something, and go at it like mad until it is working and then subside into reduced interest again.
My recent dismantling and cataloging of all my bits and pieces accumlated over the past 60 years has suddenly made available to me hundreds of parts that I had forgotten I had, and I also found it very theraputic, as well as gaining a lot of space.
