Specifications

KEYING TAB

The Keying tab includes controls for the USB Audio processor, PTT and FSK Keyboard.

Audio

Note: Audio controls are not availble under Windows Vista due to operating system limitations.

Transmit Level: sets the level of the audio output from the digital to analog

converter. Preset the slider between 50 and 80% of full scale. Adjust

the drive to your transceiver with the TX pot on the front panel of

DigiKeyer.

RX sub & RX main: these "stacked LED" displays show the audio level into the

analog to digital converter. Adjust the RX #2 and RX #1 pots on the

front panel of DIGI KEYER so that the strongest signals only

occasionally show RED.

Sample Rate: sets the sample rate used for the RX level displays.

Note: Sample Rate defaults to OFF. Due to the way Windows

handles multiple access to sound cards, it is best to leave the sample

rate OFF when not using the RX display to set levels.

Generate Test Signal: causes DigiKeyer to output a 1500 Hz audio tone for

setting the transmit output level.

TX Mixer: this button opens the Windows Volume Control (Playback Mixer) for

the selected sound card.

GET ID: this button will retrieve the name and number of the sound card used

for transmit functions. The name can be used to verify that the correct

sound card has been selected. The number can be used to configure software that identifies

sound cards only by number.

Some tips from Geoff Anderson, G3NPA:

TIP: If you have achieved the correct settings for the transmit levels, you will see that changing from

the PSK tuning tone to typing text, will make the transmitter power swing from 50% (no typing) to

100% (typing or tuning-tone) as observed on an RMS or average reading meter. This change in

power is correct. If you do NOT see this 50% change (or greater), then you are probably overdriving

the radio. Please note that some radios have inbuilt power meters which give a PEAK reading and

therefore the change in level discussed above will not be observed.

TIP: Don't fall into the trap of thinking that because the transmit signal on the waterfall looks good

that your actual signal is OK. All the waterfall is showing during transmit is the local audio and NOT

the resultant transmitted signal.