The original paperwork show a pickup coil, for the input signal, being
7 turns of wire, loose wound on a 2" former.From my calculations, that puts it at 268MHz. So you are spot on about that.
But what is the significance of this frequency? Only thing I can find is that it is the magnetic resonance of salt!
Maybe it's a sweat detector for people who aren't working :-)
Ben Hartley
I wonder if any contemporary radio engineer got his hands on the "radionics analyzer," took measurements, and wrote up a report.
Tetrahydrocanabinnol!
If I thougt it had a purpose, perhaps the output could be used to drive a thyratron? but from what input signal and why I can't guess.
-- ?? 100% natural --- Posted via news://freenews.netfront.net/ - Complaints to news@netfront.net
For these tubes, you'll need negative grid bias even for Class A, and still more negative for Class B or Class C. The circuit runs on zero bias, without the special zero-bias tubes (like 3-500Z).
-- Tauno Voipio
Please correct me if I am wrong, but I have assumed that the definition for
Thus, for class B, it does not matter if the positive or the negative half cycle gets amplified.
In the original circuit, quite a large anode current would be flowing with zero input signal, which would be stupid, unless the anode voltage is keyed by the PTT in transmitter. When an input signal is applied, only the negative half cycle would be amplified.
With a large negative grid bias, no anode current would be flowing in the idle state and only the positive half cycle would be amplified.
The only real difference between these two cases is the idle power consumption.
Actually the circuit runs NOT AT ALL half the time.
Much of the remaining time, the plate voltage is low enough that the bias is way off the normal usage curve.
The only possible use for this circuit is as a piggy bank.
-- Many thanks, Don Lancaster voice phone: (928)428-4073 Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552 rss: http://www.tinaja.com/whtnu.xml email: don@tinaja.com Please visit my GURU's LAIR web site at http://www.tinaja.com
The point in classes above pure A is to raise the efficiency, not to decrease it. It can hardly be called Class C if the amplifier clips badly on plate saturation.
Anyway, as Don evaluated, the circuit is silly.
-- Tauno Voipio, OH2UG
ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.