Done a bit of searching, treat the regen det as a stand alone oscillator then design for constant threshold of oscillation across a given tuning range, a modified Vackar seems to come very close.
The link below takes you to some work done by someone on this subject using a valve regen, the article is an interesting one, down towards the end of the article are two utube links worth watching about this subject, they are quite well done with no annoying music and no jerky camera.
Anyone who is familiar with using or building regens will note and hear how well this detector works with AM with the regen control set to a fixed position, I think it would be as constant for SSB/CW once just over the point of oscillation, it covers an almost 3 to 1 tuning spread which I think is quite impressive, the one shown tunes from approx 3.3 Mhz to just over 9 Mhz (I think) It looks like the Vackar is the way to go....?
Are there any examples of this approach in domestic vintage radios of the TRF/Regen period?
http://www.kearman.com/vladn/hybrid_feedback.pdf
Lawrence.
The link below takes you to some work done by someone on this subject using a valve regen, the article is an interesting one, down towards the end of the article are two utube links worth watching about this subject, they are quite well done with no annoying music and no jerky camera.
Anyone who is familiar with using or building regens will note and hear how well this detector works with AM with the regen control set to a fixed position, I think it would be as constant for SSB/CW once just over the point of oscillation, it covers an almost 3 to 1 tuning spread which I think is quite impressive, the one shown tunes from approx 3.3 Mhz to just over 9 Mhz (I think) It looks like the Vackar is the way to go....?
Are there any examples of this approach in domestic vintage radios of the TRF/Regen period?
http://www.kearman.com/vladn/hybrid_feedback.pdf
Lawrence.
