Amateur Radio Operator N5GE wrote: > > Where do I find the instructions for using this feature? >
Al must have forgotten to include the instructions. The following is PRELIMINARY ONLY but should get you going: Amplitude Calibration The P3 comes with a default amplitude calibration that works well with a K3 transceiver that either was manufactured after approximately 9/1/2009 or, if an earlier unit, has the IF output buffer gain modification described in the application note on the Elecraft web site. If you have an earlier unit without the modification, or you are using the P3 with a different model transceiver, or if you just wish to obtain better amplitude accuracy on the P3 display, you can do the following calibration. The recommended test frequency is7040 kHz at a signal level of 50 microvolts (-73 dBm) using a calibrated signal generator such as the Elecraft XG2. However, any frequency and power level within the range of the transceiver and P3 display will also work. * Make sure the the P3 IF IN is connected to the transceiver IF output. If the transceiver is a K3, connect the RS-232 cable as well. Turn off the preamplifier and attenuator on the K3. If you have the KRX3 installed, make sure SUB is disabled. * Connect the signal generator to the transceiver antenna input. If it is a K3 that includes the KXV3 or KXV3A option, it is best to use the RX ANT IN connector to eliminate the possibility of damaging the signal generator if the K3 transmits accidentally. * Set the signal generator for 7040 kHz at a signal level of 50 mV (-73 dBm). * Set the SPAN on the P3 to 100 kHz, and tune the transceiver to approximately 7015 kHz so that the signal is centered on the right half of the display. Set the SCALE to maximum expansion (10 dB) and adjust the REF LVL to about -78 dBm, in order to place the peak of the signal about half way up the screen. You may notice a slight variation (~1.5 dB) in the peak signal level with small adjustments in the transceiver frequency, as the signal is tuned from pixel to pixel across the display. Adjust the frequency for a maximum reading. * Tap MENU, select Lvl Cal, tap the knob, and adjust the level calibration until the signal is at -73 dBm on the display. You can also calibrate a receiving or transceiving converter, either the K3's optional internal K144XV or an external device. If you plan to do the above calibration on a standard frequency, do it first since that calibration is added to the converter calibration. * Set up a signal generator, the transceiver and the P3 in a manner similar to the above to obtain a signal near the center of the right side of the display and approximately centered vertically, with the P3's SCAN at 100 kHz and the SCALE set to 10 dB. * Tap MENU, select XV Gain, tap the knob, and adjust the knob to select the desired converter band, 1-9. Tap the knob again and adjust the gain on the selected band so that the signal is at the the correct level on the display. -- View this message in context: http://elecraft.365791.n2.nabble.com/P3-New-LVL-Cal-Function-Beta-0-41-tp5727222p5728318.html Sent from the Elecraft mailing list archive at 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
