> "Note that the default RemoteRig setting in the control RRC gives a loud CW sidetone. This can be easily lowered by going into the keyer settings and change "side tone -db" to another number."
As discussed in my post, a change in RRC sidetone level also affects sidetone level in the headphones. Reducing the sidetone level alone can create an imbalance between speaker and headphone audio -- enough to be an annoyance for me. In my case, if I reduce RRC CW sidetone level to eliminate speaker blasting, the sidetone level in headphones is too low. Moreover, reducing RRC CODEC gain to avoid speaker blasting results in digital artifacts in some sensitive headphones. This may not bother others -- and RRC menu changes may be an acceptable compromise to some users. But the resistor change significantly optimizes and rebalances level between the two output stages when using the K3 Mini with the RemoteRig RRC. The end result is a rebalancing of receive audio and sidetone level between speaker and headphones with no addition of digital noise or other artifacts. Paul, W9AC -----Original Message----- From: Paul Christensen [mailto:[email protected]] Sent: Sunday, January 17, 2016 11:10 AM To: '[email protected]' <[email protected]> Subject: Optimizing K3 Mini Speaker Gain with RemoteRig 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]
