[Elecraft] k3 matching filters

[Lyle Johnson]

> ...My DVR seems to work, but I have not been able to find
> any instructions for operating.

 From the latest beta firmware release notes [with slight editorial from 
me ]:

Support for Digital Voice Recorder option (KDVR3):

Note: The following information is more accurate than the DVR 
instructions in the K3 rev D owner’s manual.

     * DVR ICON: The DVR icon (dual arrows--above the S-meter) turns on 
whenever the DVR is in use. The icon flashes slowly during all record 
operations, and quickly during play.

     * DVR TX MESSAGES: Message record, play and repeat are functional. 
(Message chaining will be added in a subsequent release.) To start voice 
message record, tap REC, then tap M1-M4. Record will start immediately. 
Tap M1-M4 again to stop recording. To play a voice message, tap M1-M4. 
To repeat a voice message (e.g., a CQ), *hold* M1-M4 rather than tap. 
Message play or repeat can be cancelled at any time by tapping REC.

[ note: be sure the MIC Gain is set for 5 bars of ALC on voice peaks to 
get the recording level correct.]

     * DVR RX LOOP: Hold AF REC to start receive-audio recording. Hold 
AF REC again to stop record. Up to 90 seconds of audio can be recorded; 
beyond this, earlier audio will be overwritten. Hold AF PLAY to start 
playback; press any switch to stop. VFO B will show the playback 
position in seconds, relative to the most-recently recorded audio 
segment. During PLAY, you can move forward/backward through RX audio 
loop buffer by rotating VFO B. An asterisk (*) beside the seconds 
counter shows the extent of the most recently recorded segment. Note: It 
is OK to record received audio continuously; this might be useful as a 
way of catching audio events that you wish to examine later. Record will 
continue even if you transmit. However, at present, silence is recorded 
for the duration of any transmission.

     * DVR RX LOOP PLAY IN TX MODE: First, enter voice transmit mode by 
holding PTT or tapping XMIT. Then hold AF PLAY to start playback, and 
press any switch to stop. CMP (speech compression) is automatically 
disabled. Note: Playback volume of the RX loop buffer during TX mode is 
not yet adjustable.

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73,

Lyle KK7P