Figure 8‑1 shows the audio signal paths for the DVR. Your received audio, after processing by the DSP including receiver equalization (RX EQ), filtering, noise blanking and noise reduction, can be recorded by holding the key. By holding you can play back the received recorded audio, and you can transmit this recording as well if you tap or hold PTT.
You can record transmit messages in the two – memory banks. Recorded messages can be transmitted by tapping – . When transmitting, the recorded audio is processed by the DSP (TX EQ, compression etc.) just like any other audio source.
You may monitor your transmitted audio (both DVR and microphone) as you always have or you may choose to monitor DVR audio at a monitor level different than the microphone monitor level. See CONFIG:TX DVR Ind.
Figure 8‑1. Signal flow in the KDVR3 digital voice recorder.
1. You cannot transmit and record at the same time. Transmitting takes priority over recording.
2. If the DVR is transmitting, activating PTT or VOX will immediately stop it. This means, for example, if you are sending a contest report using the DVR, tripping the VOX will stop the report.
3. TX EQ and other transmit audio processing does not process audio input from your microphone or Line In when your are recording messages in the DVR.
4. RX EQ and other received audio processing does process audio before it is recorded by the DVR.
5. When the DVR plays back recorded audio to the speaker or headphones, no further RX EQ or other receiver audio processing is done. You hear what was recorded.
6. Audio output from the DVR to be transmitted is processed by TX EQ and other transmit audio processing.
7. If you transmit recorded received audio, the transmitted signal will have both received audio processing (done when recorded) and transmit audio processing.
8. – and – cannot be used for message keys and programmable function keys simultaneously.
After installing the KDVR3, configure it as shown in Table 8‑1.
Table 8‑1. DVR configuration menu.
There are eight DVR message memories in two banks of four as shown in Figure 8‑2, similar to the eight CW message memories. Holding toggles between BANK 1 and BANK 2. Tapping – accesses each of the memories in the currently active bank. You may record up to 14 seconds in each memory. The remaining buffer time is displayed in the VFO B display area as you record. In addition to voice messages, when you are operating CW the eight memories are available for CW messages. Chapter 3 shows how to program these.
Figure 8‑2. DVR message memories.
Recording the Message
The signal flow for recording a message is shown in Figure 8‑3.
1. Hold to enter test mode so you won't be transmitting while recording.
2. While speaking into your microphone with a normal voice, adjust for a peak ALC reading of about 5 bars for the proper recording level.
3. Disable VOX or take care not to trip the VOX or you will transmit, not record.
4. Hold REC to select BANK 1 or BANK 2.
5. Tap and then tap – .
6. Record your message. The remaining time in seconds is displayed while you record. If you must use PTT to get audio from your microphone, press PTT after starting to record.
7. Tap again to stop and then hold to leave test mode, although it is a good idea to stay in transmit test mode until after you check your message by playing it back.
Figure 8‑3. Recording a message.
Playing Back a Message
The signal flow for playing back a message is shown in Figure 8‑4
1. Hold REC to select BANK 1 or BANK 2.
2. Tap – . Sit back and listen to your message being sent.
3. To cancel a message after it starts, either tap or , activate PTT or VOX, or tap any other switch besides – .
Figure 8‑4. Playing back a recorded message.
1. Tap , then the key to be erased, and then in quick succession.
Auto-Repeat a Message
Hold, rather than tap, M1 – M4 to repeat the message in the buffer. The message repeat interval may be set to 1 to 255 seconds by the MAIN configuration menu item MSG RPT. Tapping tap or , activating PTT or VOX, or tapping any other switch besides – cancels the message.
Table 8‑2. Main menu message repeat time.
You may record up to 90 seconds of received audio in a loop recorder. That is, if longer than 90 seconds is recorded, the oldest data will be recorded over. Figure 8‑5 shows how the DVR recording buffer is used when recording received audio. In Figure 8‑5(a), 45 seconds have been recorded. When played back, VFO B shows *01 – *45. The "*" indicates that this is the most recent audio clip recorded, and 01 – 45 shows where you are in the 45 second recording. In Figure 8‑5(b), another audio clip of 20 seconds is recorded. This is recorded over the first 20 seconds of the first recording. When played back, VFO B shows *01 – *20 when it is playing the 20-second recording and then 21 – 45 when it is playing what is remaining of the first recording.
Figure 8‑5. Received audio buffer use.
Recording the Received Audio
As shown in Figure 8‑6, the receiver's audio is processed by the receiver equalization (RX EQ) and any DSP filtering, noise blanking or noise reduction.
1. Hold to start recording received audio. The icon just above the right end of the S-meter will slowly flash during recording.
2. Hold again to stop recording.
Figure 8‑6. Recording received audio.
Playing Back Received Recorded Audio
You can play back the recorded audio so that it is heard in the speakers and headphones. It can also be retransmitted. VFO B will display a seconds counter showing the current time in the 90 second record buffer as Figure 8‑5 shows. The playback starts at the beginning of the most recently recorded audio. An * is displayed when you are in the most recently recorded segment. See Figure 8‑5. Figure 8‑7 shows the signal flow when playing the audio buffer.
1. Hold to play back the current recorded audio. The icon just above the right end of the S-meter will flash quickly. Rotate VFO B to jump forward or backward through the audio.
2. Stop playback by tapping any button.
Figure 8‑7. Playing back recorded received audio.
Transmitting Received Recorded Audio
Figure 8‑8 shows the signal flow for transmitting audio that has been recorded from the receiver.
1. Activate PTT or tap before starting the play back.
2. Hold to play back the most recently recorded audio. The icon just above the right end of the S-meter will flash quickly. Rotate VFO B to jump forward or backward through the audio.
3. Stop playback by tapping any button.
Figure 8‑8. Transmitting received recorded audio.
As Section 8.1.1 above describes, – and – can be used programmable function keys and macro keys. When they are, you cannot use them for message keys, but any pre-recorded messages saved for these keys can be recovered.
1. Switch to CW mode.
2. Tap .
3. Then tap the buffer you would like to restore ( – ).
4. Then tap again.
5. Switch back to SSB mode.
Once you have done this, – and M1 – M4 are restored to playing and repeating messages.
Preview Chapter 9