I have recently ordered a K3DF DSP Low Pass Filter to add to the DSP board in my K3. After reading through the relevant documentation, it appears my DSP board is "Revision B" and therefore does not have the low frequency audio mods for TX/RX either.
It seems that I could not find anywhere that told me exactly what the changes were to effectively bring my DSP board up to the latest spec. I know I could ship my board to Elecraft for upgrade, however the cost of the shipping to/from Australia is expensive. I have looked through both the early and current schematics and believe I have a compiled complete list of the changes for the "Low Frequency Audio Mods": ----------------------------------------------------------------------- Drawing "K3 DSP IF: CODECS" COMPONENT ORIGINAL VALUE NEW VALUE R17 1K 10K R18 1K 10K R19 1K 10K R20 1K 10K R23 1K 10K R24 1K 10K R25 1K 10K R26 1K 10K C28 0.1uF 1uF Drawing "K3 DSP: DAC Audio" COMPONENT ORIGINAL VALUE NEW VALUE C1 33pF 470pF C11 33pF 470pF C9 10uF/25V 100uF/6.3V C13 10uF/25 100uF/6.3V ----------------------------------------------------------------------- For my records, I have drawn circles around the changed components in the relevant schematics and have these as individual pdf pages. If anyone would like a copy, please contact me via email. it would be even better if someone would offer to host them on their site / webspace? Andy VK4KY -- View this message in context: http://elecraft.365791.n2.nabble.com/K3-DSP-Board-Upgrade-Info-tp5252898p5252898.html Sent from the Elecraft mailing list archive at Nabble.com. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
