According to Vol 1 of the MIT Radiation Lab. Series, "Radar System Engineering" published in 1947, the selection of 50 ohms was based on a practical compromise between the 77 ohm value giving minimum
At 13:55 04/05/2003 +0100, you wrote: After reading Jim's e-mail I searched through all my radio books (Terman, Kraus et al) for enlightenment and the reason for 50ohms as a standard is not discussed
Jim, LFers I have some samples of old trans-atlantic telephone coax cable - according to the labels, they are from the TAT-1, TAT-II and CANTAT-2 cables. Measuring the dimensions of these, they work
At 13:55 04/05/2003 +0100, you wrote: After reading Jim's e-mail I searched through all my radio books (Terman, Kraus et al) for enlightenment and the reason for 50ohms as a standard is not discussed
Over the years I had come to think of 50ohms for coax cable and RF equipment as some sort of Fundamental Constant and never questioned it. When I described test equipment in 'The Antenna Experimenter
The choice is not entirely arbitrary - as I recall, 50ohm coax gives the best power handling capability for a given size of cable, while 75ohm gives the lowest loss. This is probably academic in amat
John A, With the proposed 100 watt transmitter output limit here in the U.S., we can be a little more conservative with audio amplifiers used as transmitter PA's. I have been playing with a nominal "
Jim, et al: With the proposed 100 watt transmitter output limit here in the U.S., we can be a little more conservative with audio amplifiers used as transmitter PA's. I have been playing with a nomin
Dear Peter, LF Group 50ohm systems were chosen by equipment, test gear, coax cable and antenna manufacturers in the interests of standardisation - there is nothing 'magic' about 50ohms systems. There
