I have now completed my modification by installing the replacement power module. The changes required to fit the new module are very simple, it is just a matter of removing 2 links and one inductor and installing one link and two resistors, plus the module.
Power output of 20W was achieved immediately for -20 dBm input. The power will easily go beyond 30W but the heatsinking is not adequate even for 20W so I recommend keeping it to 10W or less. If the gain is too high, the resistor supplying the driver stage could usefully be changed to the same value as in the XV144. My receiver noise figure measurement attempts were thwarted by our local 70 MHz beacon. However, setting the measurement bandwidth to 100kHz allowed me to measure the noise figure at 69MHz which was ~1.5 dB. This could no doubt be improved by replacing L1, but is good enough for 70MHz already. I have not done a 2 tone test yet, I will try this later. The results should be as good as the XV50 and 10W is will below the maximum output. Mike PS - Can anyone make an appropriate XV70 indicator for the front? -- View this message in context: http://www.nabble.com/XV50-on-70MHz-tp14067091p14730575.html Sent from the Elecraft mailing list archive at Nabble.com. _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
