Since last May, I've been using a K3 Mini with RemoteRig. Apart from one anomaly, operating the K3 Mini has been a great experience. However, when using RemoteRig, K3 mini speaker audio is extremely loud and the CW side-tone is even louder. However, receive audio and side-tone level in headphones is excellent. If one tries to reduce CODEC gain in the RemoteRig, then headphone audio suffers and low-level digital artifacts start becoming detectable.
The fix inside the K3 Mini involves replacement of two (2) "603" size SMT resistors at R39 and R40. The stock values are 15K. I changed these to 100K. This results in a computed gain close to zero (Av = 1) for the speaker amp and allows it to be used as a current driver for the speakers. After the modification, speaker audio approximates headphone level without excessively loud receive audio and side-tone. This change may affect operation of the K3 Mini when a RemoteRig is not used in some applications. However, probably most K3 Mini owners use theirs with a RemoteRig. Suggestion to Elecraft: if there was a design reason for so much speaker gain, consider placing 0.100" headers on a future PCB revision to allow jumper selection of either the 15K resistors or 100K. Many thanks for a great product. Paul, W9AC ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
