K3 built-in 2-tone generator problem (2.7 kHz filter)

[wayne burdick]

The K3 provides an internal 2-tone generator for SSB transmit IMD
testing.

We just discovered that it was not working with the 2.7 kHz filter. One
of the tones would in this case be right on the filter's edge,
resulting in very poor tone balance. Also, 2-tone testing was set up to
work only in LSB mode.

Anyone trying to use the 2-tone generator for testing with the 2.7 kHz
filter and/or USB may have quite anomalous results.

Both problems will be corrected in the next beta-test release, likely
to be next week. If you're doing 2-tone testing and would like to try
the latest field-test firmware, which has the corrections, please
e-mail me directly.

73,
Wayne
N6KR

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[Guy, K2AV]

wayne burdick wrote

We just discovered that it was not working with the 2.7 kHz filter. One
of the tones would in this case be right on the filter's edge,
resulting in very poor tone balance. Also, 2-tone testing was set up to
work only in LSB mode.

Anyone trying to use the 2-tone generator for testing with the 2.7 kHz
filter and/or USB may have quite anomalous results.

As in some may have been affected, others not, depending on the filter?

I would assume that everything was OK if one was viewing the transmitted two-tone signal with a scope and was able to adjust the independent tone to get a nice sharp zero crossing notch on the RF envelope viewed at an audio sweep rate.

73, Guy.