Kachina 505DSP Additional Controls

Table of Contents

• CW
• VOX
• Speech
• RX
• TX
• Master Oscillator Calibration
• Advanced multi-frequency analysis

CW

The internal keyer can be enabled for left or right handed operation. It can also be configured for straight key operation. The words/min, weight and attack of the keyed waveform can be set. The Kachina Pegasus is a QSK rig. Select QSK operation by enabled the QSK check box. Press the Spot button to hear an injected tone at the side tone (Offset frequency). Use this for zero beat with a received signal.

You can adjust the keyer sidetone relative to the received audio. Set the control to zero if you do want to hear the sidetone. The Offset frequency is the CW BFO pitch. You can elect to use the narrow or wide filter for CW. The Farnsworth controls are associated with the CW Keyboard.

VOX

You can operate the Kachina with manual SSB PTT or with VOX. The three Vox controls are controlled IAW the Kachina manual.

Speech

You can enable the SSB speech level (recommended only with headphones) or monitor the digital audio that is applied to the rear panel auxiliary connector. The compression level is also adjustable and speech compression can be enabled or disabled as suited. Do not use speech processing with digital mode audio.

RX

The squelch control can be used to open the audio based on either level or syllabic action. -127 dbm setting disables the squelch. A sliding button indicator next to the smeter indicator shows the position of the level squelch. AGC action and AGC speed can be adjusted to suit the operating requirements.

TX

Enable the "Amp on/off" if you want the Kachina to operate with an amplifier that is keyed. Adjust the equalization to accentuate portions of the speech spectrum. Low values increase base, high values increase treble

Master Oscillator Calibration

The signal frequencies internal to the Kachina are all derived from a single oscillator. That oscillator can be corrected for frequency errors.

Advanced multi-frequency analysis

Proceed as follows.

Simple single frequency adjustment:

1. Set the DDS adjust to 0
2. Set the DDS offset to 0
3. Tune the transceiver to to external reference (WWV at 10 MHz for example).
4. Set the transceiver to CW mode, 1 KHz bandwidth
5. Adjust the volume control so that you can hear the beat note
6. Turn the CW spot control ON and adjust the Spot volume so that both the WWV and the Spot notes are about the same amplitude.
7. Adjust the "DDS adjust (ppm)" for zero beat between the WWV and spot tones.
8. You're done

Advanced multi-frequency adjustment:

1. Repeat 1 through 6 above for each of 5/10/15 MHz WWV signals (or other signals available at your QTH). At each frequency adjust the "DDS offset" control for zero beat. This will vary with each external reference frequency.
2. Record the frequency and the offset value need for zero beat.
3. Enter these into a spreadsheet program (preferably Gnumeric or Xcel).
4. Plot the pairs and you should get something similar to that shown at the left.
5. Perform a regression analysis on the pairs to determine both the slope and the y intercept of the extended curve.
6. Enter the slope value into the "DDS adjust (ppm)" control
7. Enter the intercept value into the "DDS offset" control.
8. You are done.

Using FLDIGI with the above:

Set FLDIGI to the frequency analysis mode. Set the waterfall cursor at the CW tone (i.e. 700 Hz). When each reference is adjusted the WF signal should be exactly at the CW tone frequency. This will occur at zero beat.

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