For some reason I am feeling hesitant on this conversion. I bought an 8 wire cord and connector off ebay. I checked pin/color, and found that pin 6 was cut from orange. Strange? I'm uncertain of ground1 vs mic ground. I am adding channel changing switches, but that part seems simple. Any help on what to what? I wouldn't be concerned if there wasn't power to the mic. Thanks
hi
first of all using a dynamic mic (NC or not) on a radio designed for ecm mics will sound quieter than the stock mic and has certain issues as below
next i believe the rk56 has a 6 core cable standard
http://www.eham.net/reviews/detail/8407 ..considering the optima mic only uses 5 wires (4 wires plus shield) you didnt need to buy that cable at all attached is the stock optima mic wiring ..
if you insist on using a dynamic mic on the radio you WILL need to add a 104 (0.01uf) cap in series with the mic insert to pin 1 of the mic plug or you risk burning out the voltage regulator in the radio that powers the ecm insert in the stock mic as it will present a load to the regulator it was not designed for
which will kill any use of the stock mic in the future and possible damage to the cpu board
(this has NOTHING to do with the voltage present on pin 2 of the mic socket )
the cap provides isolation of the dc voltage from being loaded down by the element in the insert ..ac component such as audio will still pass from the element to radio (used as a dc blocker)
often people think pin 2 of the mic socket provides dc power to the element this is totally incorrect
this was provided for use with other powered mics/inserts such as dtmf mics or data mode modems .
i see on the RK56 diagram 222dbl has provided there is a cap in series with the mic audio wire..confirm this if you can
looking at the diagram 222dbl provided red and blue seem to be incorrect in diagram for rk56 ..diagram says red is ptt and blue is tx/rx common how ever on the actual diagram its self they are connected to the wrong terminals on the switch ....oh well lol
rk56 to optima should be
white (mic audio) to pin 1
red (tx) to pin 5
blue (common ) to pin 6
shield to pin 7
optima phantom mic wiring provided below for reference