04-07-2012, 08:40 PM
I did a couple more tests on the regenerodyne this afternoon, up till now using the harmonic generator I have been mainly using Fo above Fs, this afternoon I put it through its paces using Fo below Fs, it works a lot better as the harmonic output available to the mixer is larger using the lower harmonics.
The other test I did concerns frequency stability, I have no frequency counter so I used the zero beat method.
The regenerodyne and the B40 (the donor osc) were switched on and allowed to warm up for 1 hour I then did the test at 10 Mhz by tuning in to the WWV standard, the signal was tuned in and the regen detector was brought into oscillation, the signal was then tuned for an exact zero beat, I then left it, coming back 1 hour later I could not detect any audiable beat drift, that is not to say that there is'nt any drift at all but it does say that audiably there wasn't any all I was getting was the thud thud as the WWV signal was ticking away which is what I had when setting the initial zero beat.
So, conclusion...The 1 mhz osc in the B40 is solid as a rock, the regen detector when brought into oscillation also seems to be solid.
Need to bear in mind that the regen det was oscillating at the low end of its range (2 Mhz) and not the high end (3 Mhz) as I am now using the harmonics below the signal frequency to select the Mhz band.
I have not got any 80 meter coils or any for bands below 80 meters (ie: 160) wound at the moment but when I do I will go back to using Fo above Fs, obviously....Having said that the harmonic generator tank can be tuned to the fundamental for Fo below Fs coverage of the 80 meter band.
Lawrence.
The other test I did concerns frequency stability, I have no frequency counter so I used the zero beat method.
The regenerodyne and the B40 (the donor osc) were switched on and allowed to warm up for 1 hour I then did the test at 10 Mhz by tuning in to the WWV standard, the signal was tuned in and the regen detector was brought into oscillation, the signal was then tuned for an exact zero beat, I then left it, coming back 1 hour later I could not detect any audiable beat drift, that is not to say that there is'nt any drift at all but it does say that audiably there wasn't any all I was getting was the thud thud as the WWV signal was ticking away which is what I had when setting the initial zero beat.
So, conclusion...The 1 mhz osc in the B40 is solid as a rock, the regen detector when brought into oscillation also seems to be solid.
Need to bear in mind that the regen det was oscillating at the low end of its range (2 Mhz) and not the high end (3 Mhz) as I am now using the harmonics below the signal frequency to select the Mhz band.
I have not got any 80 meter coils or any for bands below 80 meters (ie: 160) wound at the moment but when I do I will go back to using Fo above Fs, obviously....Having said that the harmonic generator tank can be tuned to the fundamental for Fo below Fs coverage of the 80 meter band.
Lawrence.
