Home |
Search |
Today's Posts |
#11
|
|||
|
|||
Richard Clark, KB7QHC wrote:
"However, I would be surprised if a practical common Amateur grade transistor model transmitter commonly available for more than 30 years now has any configuration that does not supply voltage directly to the final transistors---." My Kenwood TS-130S manual has specifications on page 2. Transmitter output impedance is specified as: 50 OHMS! Om page 30 is a level diagram. Output from the transmitter`s low-pass filter is measured as 70.7 volts at 14.25 MHz, which is 100 watts into 50 ohms (square root of PR). D-C power is fed to the center-tap of a push-pull output transformer to the final transistors. From the specifications page also, the power reguirement is TX: 18A 13.8V DC. It`s a linear amplifier. Only 40% efficiency. The designer probably was more interested in low harmonics than efficiency. The final by itself only takes part of the 18A ao its efficiency is more than 40%. Kenwood says its transmitter presents an impedance of 50 ohms at its "OUT" terminals in the diagram on page 30. 100 watts at 70.7 volts. Best regards, Richard Harrison, KB5WZI |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Discone antenna plans | Antenna | |||
The "TRICK" to TV 'type' Coax Cable [Shielded] SWL Loop Antennas {RHF} | Antenna | |||
Poor quality low + High TV channels? How much dB in Preamp? | Shortwave | |||
X-terminator antenna | CB | |||
Outdoor Antenna and lack of intermod | Scanner |