I have an issue to report and it seems this thread as good a place as any. It might help someone else trying the same thing.
On 6 meters only, it seems the LO leaks out on the outside of the antenna connector. I can hear it in another radio on the same frequency and the RX ISO has no effect. I am using the KX3 as a second receiver to provide I and Q outputs, with the KX3 antenna connector connected to the output of a buffer amp installed in the other radio after that radio's preamp. If I connect only the shield of the coax the LO is heard. The RX SHFT corrects the problem, a the radios are synced in frequency. I have no other issues with this setup and both receivers provide good results with no obvious anomalies. I have a guy two blocks from me and there is no obvious receiver desense when they transmit. Mark On Tue, Jun 18, 2013 at 8:45 AM, Wayne Burdick <n...@elecraft.com> wrote: > Hi all, > > Here some tips for getting the most out of your KX3 at field day: > > 1. BATTERY OPERATION: To conserve battery power, use 5.0 watts or less > when running from a 12-V source, and 3.0 watts or less when running from an > 8-10 V source (including internal batteries). At these levels, the KX3 > automatically switches the power amplifier to a more efficient setting. You > can tell that power-saving mode is in effect by a decimal point after the > 'W' in the power value (e.g., "5.0 W."). To reduce supply current in > receive mode, use headphones rather than the internal speaker, and if > lighting conditions permit, turn off the LCD backlight (MENU:BKLIGHT). > > 2. ANTENNA SPACING: If you're using more than one transmitter, try to keep > the antennas as far apart as possible. This is a good practice with all FD > stations, because it can prevent receiver de-sensing and intermodulation > distortion. If you have no choice but to have the antennas close together, > and you hear artifacts (such as SSB signal bleedthrough) in your KX3 while > another station is transmitting, try setting MENU:RX SHFT to 8.0 rather > than NOR on the affected band. You could also turn the preamp off, or > reduce preamp gain on affected bands using the PREAMP menu entry. > > 3. OSCILLATOR ISOLATION: The KX3, like other radios with a quadrature > direct-conversion architecture, uses a VFO (local oscillator) running at or > very close to the operating frequency. If you have another radio on the > same band as the KX3, and the antennas are close together, the other radio > may be able to hear the KX3's oscillator when they're both tuned to the > same frequency. > > To prevent this, the KX3 includes an isolation amplifier that keeps the > oscillator from radiating back through the mixer. Normally this amplifier > is turned off to save about 15 mA of receive-mode current drain. To turn on > the isolation amp, set MENU:RX ISO to ON. This has no effect on performance. > > Have fun! > > 73, > Wayne > N6KR > > > > > ______________________________________________________________ > 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 > ______________________________________________________________ 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
