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
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