[Elecraft] KX3 I/Q to soundcard isolation

[N6363LLL]

Hello All,

There are big differences between interfacing a PC to the KX3 I/Q port
compared to the needs of digital modes that use the headphone and mic audio
connections.  The I/Q port requires a flat bandpass to at least 48Khz.  If
you decide to use isolation transformers for the I/Q port, they must be very
high quality and support wide bandwidth.  If you use an external soundcard
for the I/Q port, you must use a high quality soundcard that meets pro audio
standards for noise, etc.  See the data on the N8LP website about soundcards
suitable for I/Q use.  Your laptop might have a high quality stereo input
soundcard and it's worth trying that first.

For the digital modes, a Rigblaster, Microham interface, US Navigator
interface, RigExpert, SignalLink, etc. isolate monophonic low bandwidth
audio going in both directions.  They are not suitable for use on the I/Q
port.

Steve Silverman  KB3SII  ... .. ..



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