If you connect directly to mic/speakers on both the PC and Radio be
very careful. The PC speaker output can over drive the audio if you
put it straight to the microphone of the rig and I would always
advise using isolating transformers. You can spot people who have
gone the 'straight through to mic input' route when they overdrive
their audio and produce very wide signals.
An isolation transformer does not solve the excessive level problem.
For that you need an attenuator or voltage divider. Typically one
would connect a 4.7K or 10K resistor in series between the sound card
output and the mic input and a 470 or 1000 Ohm resistor from the mic
input to the mic ground. That 20dB is about right for the sound card
line/speaker output to an electret mic input. Substitute 47K or 100K
for dynamic mic inputs or use a 500/1000 Ohm pot with the wiper to
the mic input instead of the fixed shunt resistor.
73,
... Joe, W4TV
On 10/13/2013 4:38 AM, Dave wrote:
If you connect directly to mic/speakers on both the PC and Radio be very
careful. The PC speaker output can over drive the audio if you put it
straight to the microphone of the rig and I would always advise using
isolating transformers. You can spot people who have gone the 'straight
through to mic input' route when they overdrive their audio and produce
very wide signals.
A better option is to use Line in/Line out on the PC and interface to an
accessory socket that takes constant line levels. not lookied at the
KX3 data inputs yet but if they are provided use them...
Personally, I have used a US Interface Navigator. It provides excellent
interfacing on both audio and computer connections. HRD is a bit
expensive if you want the latest version, I well remember when it was
free and there were a group of peopkle testing it and sugesting
improvements and identifying bugs...
Dave (G0DJA)
----- Original Message ----- Sent: Sunday, October 13, 2013 3:58 AM
Subject: Re: [Elecraft] Interface and Ham Radio Deluxe
Dale,
I like and use a SignaLink USB and like it. However, almost any of the
popular interfaces will work. Or, you could just use the mic and
headphone connectors on your PC and run cables to the mic and
headphone connectors on the KX3. That can work also.
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