Thanks, Bill! I printed the instructions and will try it later today. 73, Tom Radio Amateur N5GE QCWA Member 35102
On Thu, 11 Nov 2010 03:18:25 -0800 (PST), Bill W4ZV <[email protected]> wrote: [snip] >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. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
