PSK mic input question

[rabbott]

I am attempting to operate PSK31 on my K2.  I am using a BuxCom Rascal interface, with a cable from "external speaker" for audio into the computer, and a cable to the mic input using both the audio in and PTT lines with a common ground.

I am able to receive properly, and the PTT works correctly.  However, the audio input is not working correctly.  There is little or no output from the K2 (as seen on a wattmeter) no matter what the audio input level is from the computer sound card, but if the signal is monitored on another reveiver there is a very noisy, pulsing tone that does NOT change with raising and lowering the audio input level from the computer.

Since I have been using the computer and the interface with other rigs, I believe the fault is not with these parts.  I have also confirmed that the mic connector is wired correctly.

I have set the K2 up to use the Heil Proset headset, which means that I have placed the appropriate resistor between pins 6 and 1 on the front panel mic connector.  My suspicion is that the voltage supplied by that resistor may be causing the problem.  Since I will be using the K2 with the Proset most of the time, I do not wisk to remove the resistor.  Anyone have any experience with this or any suggestions?  Thanks.

73,
Larry  WA3ELQ
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[Don Wilhelm-3]

Larry,

Depending on the design of your PSK31, that resistor COULD likely be causing
the problem by applying voltage to parts of the interface that would
'object' to it.

If your interface does not have DC isolation on the audio input line to the
K2, I would suggest that you add a series capacitor.  The value will depend
on a LOT of things (mainly impedance levels), but I would start with
something like 0.1 uf and see what kind of response results.

73,
Don W3FPR

-----Original Message-----

I am attempting to operate PSK31 on my K2.  I am using a BuxCom Rascal
interface, with a cable from "external speaker" for audio into the computer,
and a cable to the mic input using both the audio in and PTT lines with a
common ground.

I am able to receive properly, and the PTT works correctly.  However, the
audio input is not working correctly.  There is little or no output from the
K2 (as seen on a wattmeter) no matter what the audio input level is from the
computer sound card, but if the signal is monitored on another reveiver
there is a very noisy, pulsing tone that does NOT change with raising and
lowering the audio input level from the computer.

Since I have been using the computer and the interface with other rigs, I
believe the fault is not with these parts.  I have also confirmed that the
mic connector is wired correctly.

I have set the K2 up to use the Heil Proset headset, which means that I have
placed the appropriate resistor between pins 6 and 1 on the front panel mic
connector.  My suspicion is that the voltage supplied by that resistor may
be causing the problem.  Since I will be using the K2 with the Proset most
of the time, I do not wisk to remove the resistor.  Anyone have any
experience with this or any suggestions?  Thanks.

73,
Larry  WA3ELQ

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