Timeline for Lightbulb as an SWR detector?
Current License: CC BY-SA 4.0
2 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Aug 24, 2018 at 16:57 | comment | added | K7PEH | The Pi-network output of those old tube transmitters could tune up onto many various types of loads, one being the light bulb. The main problem a new ham would have with this is thinking that tuning the transmitter into a light bulb removes the need to tune up into the antenna. A real antenna poses a different load (R+jX) to the lightbulb's (R+jX) load. Thus, tuning into a light bulb is not a substitute for tuning into your antenna. My transmitter at the time (early '60s) was an Eico 720, I used a light bulb for testing purposes only -- that is, does it work at all type testing. | |
| Aug 24, 2018 at 4:14 | history | answered | PeterH | CC BY-SA 4.0 |