"The K144XV is essentially an Elecraft XV144 transverter adapted to fit into the K3. The RX and LO parts are almost completely taken over from the XV144 so you can expect a similar level of RX performance from the K144XV. Contrary to the XV144 the TX/RX switching inside the K144XV is implemented by using PIN diodes, which is smaller, faster and not really a drawback in terms of IMD. To further reduce the K144XV size the TX driver and final amps have been completely replaced by discrete stages rather than using a RF module as in the XV144. The design of these high gain discrete power stages under space constraints can be a challenging task, since unwanted coupling between components might cause oscillations. As there are no dedicated control lines connected to the K144XV, the transverter functions are handled by the KXV3A interface via DC voltage levels and pulses on the IF in/out lines. TX/RX switching is maintained through an overlayed DC voltage on the receiver IF line, whereas the transverter ON/OFF and LO range control is managed through different length DC pulses on the transmitter IF line."
Keith, KV5J -- Sent from: http://elecraft.365791.n2.nabble.com/ ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
