28-09-2017, 04:39 PM
Hi.
I hear what you say Michael but the proof of the pudding is in the eating, would you not agree. Using just one valve with a proper tank coil and tuning I get a useful range of 10 meters, with traceable signal 50 meters from the shed.
All the theory is well and good but often in practice the theory is disproved.
The added RF stage is really an unnecessary luxury and believe it or not the single valve will illuminate the LED.
The AF buffer was also an added stage that doesn't add much to the transmitter. I've another one I made up that uses a 1mhz crystal in a tobacco tin using a PP3 & Ni-Mh AA and it works good during the day, get a bit of whistling at night though, it's a single valve type, these have to be the simplest pantry transmitters ever made.
I hear what you say Michael but the proof of the pudding is in the eating, would you not agree. Using just one valve with a proper tank coil and tuning I get a useful range of 10 meters, with traceable signal 50 meters from the shed.
All the theory is well and good but often in practice the theory is disproved.
The added RF stage is really an unnecessary luxury and believe it or not the single valve will illuminate the LED.
The AF buffer was also an added stage that doesn't add much to the transmitter. I've another one I made up that uses a 1mhz crystal in a tobacco tin using a PP3 & Ni-Mh AA and it works good during the day, get a bit of whistling at night though, it's a single valve type, these have to be the simplest pantry transmitters ever made.
