I've posted a few photos of the modifications that I made at the same time I installed the KDVR3. Modifications include:
- External ALC Modification and Optional Pull-Up resistors for Band Outputs - AF Stage Upgrade - Line Out and Speaker Amplifier (the "easy" way & using the SMD resistors) - Front Panel Microphone Circuit Modification - Application Note - Improving the Immunity of the Rear-Panel RS232 and Audio Connectors to RF - Application Note And, a TOTALLY UNAUTHORIZED implementation of the "K3 Caution when using an external monaural speaker" post to the reflector by Wayne on December 20, 2008. The email outlines a circuit modification which is meant to protect the audio output chip from spikes by putting a 470 ohm resistor to ground from each of the speaker outputs and suggests that a convenient place to do this would be on the audio daughter board at the single-row, right angle male connector. You can see how I did this in the photo. I'd advise you to WAIT until Lyle creates an actual application note and posts it! DO THIS AT YOUR OWN RISK! For all I know, I've got it wrong - but - didn't see any smoke and it seems to work - for me! YMMV! You can see my simple photos at: http://www.flickr.com/photos/n4hh No registration is required. Use the "Slideshow" for larger images. While I really didn't notice a "need" to do these modifications, it was convenient to do them along with the installation of the DVR. None of these modifications (including installing the KDVR3) required the removal of the Sub-Rx and other than being a bit tedious, were simple and straight forward including using a toothpick to hold down the SMDs! Have fun! '73 es gud dxing - Don N4HH K3/100 #83 No virus found in this incoming message. Checked by AVG - http://www.avg.com Version: 8.0.176 / Virus Database: 270.10.5/1883 - Release Date: 1/8/2009 6:05 PM
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