Elecraft Introduces the 2T-gen Two-Tone Test Generator

[Eric Swartz - WA6HHQ]

But wait, there's more.. ;-)

Elecraft Introduces the 2T-gen Two-Tone Test Generator

How do you know how clean your HF SSB transmitter or amplifier is? One
of the most important performance measurements is Transmit
Intermodulation Distortion (IMD).

Elecraft’s new 2T-gen is a 2-tone test oscillator that has been designed
to provide a standard 2-tone (700 and 1900 Hz) audio source for testing
of SSB transceivers and linear amplifiers. This type of testing is
almost universally used as a measure of transmitter linearity for
amateur radio equipment. (Linearity impacts both SSB fidelity and the
amount of SSB splatter that causes adjacent channel interference.)
Results of 2-tone IMD tests can be found in every ARRL review of new
transceivers and power amplifiers.

The 2T-gen is battery operated and provides sufficient output level
(0-200 mV) to be connected directly to the microphone connector of
almost any transceiver. Transmitter linearity can then be observed
either by observing the transmit signal 2-tone envelope on an
oscilloscope or station monitor. For more exacting IMD measurements the
output can be measured using a spectrum analyzer.

For the 2T-gen, F1 is 700 Hz and F2 is 1900 Hz, which results in a 3rd
order product of 3100 Hz and a 5th order product of 4300 Hz. The
amplitude of these undesired outputs is usually increased as the
transmitter output is increased, and is caused by various transmitter
amplifier stages beginning to operate in compression.

Like our other low cost mini-modules, the 2T-gen is quite small: the PC
board is just 2.5"W by 3.5"L. Rubber feet are also included so the unit
can be used on the workbench.

The 2T-gen is available now, and is priced at $59. For further details
(including downloadable manuals) on the 2T-gen, visit our web site,
http://www.elecraft.com

73, Eric WA6HHQ

--

_..._

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[Darrell Bellerive]

On August 30, 2005 05:32 pm, Eric Swartz WA6HHQ - Elecraft wrote:
> Elecraft Introduces the 2T-gen Two-Tone Test Generator

Okay, I've seen two-tone tests of SSB transmitters published by ARRL for 30
years and they do show how clean a transmitter is, but how would one use the
two-tone test generator to adjust or align the K2? Would this generator allow
for better alignment as spectrogram does for IF filter alignment?

--
Darrell Bellerive
Amateur Radio Stations VA7TO and VE7CLA
Grand Forks, British Columbia, Canada
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