KX3 PSK

[John Griswold-2]

I am using DigiPan to play PSK31 with my KX3. In the DigiPan waterfall,
it looks as though someone has dragged a comb through it, with trace
alternating with dark space showing no signal. I went through the menu
changes I had made, and when I toggle between Dual RX Off and Auto, the
PSK display changes. I have posted a picture
http://www.kk1x.net/photos/psk.jpg for those interested.

I'm curious to know why this is - now that I know why it happens, I'm
pleased, but I wonder if anybody on the list could explain it to me.

Thanks & 72,
John KK1X

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|John Griswold, KK1X  |
|[hidden email]        |
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[Don Wilhelm-4]

John,

Are you using isolation transformers (galvanic isolators) between the
KX3 and the sound card?
That may help.  The alternative to galvanic isolators is to tie the
grounds of both the KX3 and the computer together with heavy wire (or
copper braid)  Be certain that the power supply to the KX3 is included
in this bonding - the bonding should be from each device to a single
point ground.

Yes, I know that laptops with plastic cases are difficult to find a good
place to connect the bonding strap - in that case, the galvanic
isolation is the easiest solution.

73,
Don W3FPR

On 3/1/2013 7:17 PM, John Griswold wrote:

> I am using DigiPan to play PSK31 with my KX3. In the DigiPan
> waterfall, it looks as though someone has dragged a comb through it,
> with trace alternating with dark space showing no signal. I went
> through the menu changes I had made, and when I toggle between Dual RX
> Off and Auto, the PSK display changes. I have posted a picture
> http://www.kk1x.net/photos/psk.jpg for those interested.
>
> I'm curious to know why this is - now that I know why it happens, I'm
> pleased, but I wonder if anybody on the list could explain it to me.
>
> Thanks & 72,
> John KK1X
>

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[John Griswold-2]

Peter, VK4JD, wrote to suggest it was the stereo effects control, which
was set to delay. I changed it to Off and voila!

Although I plan to get parts for an audio isolator anyway.

Thanks Peter!
Thanks Don!


On 3/1/2013 7:34 PM, Don Wilhelm wrote:

> John,
>
> Are you using isolation transformers (galvanic isolators) between the
> KX3 and the sound card?
> That may help.  The alternative to galvanic isolators is to tie the
> grounds of both the KX3 and the computer together with heavy wire (or
> copper braid)  Be certain that the power supply to the KX3 is included
> in this bonding - the bonding should be from each device to a single
> point ground.
>
> Yes, I know that laptops with plastic cases are difficult to find a
> good place to connect the bonding strap - in that case, the galvanic
> isolation is the easiest solution.
>
> 73,
> Don W3FPR
>
> On 3/1/2013 7:17 PM, John Griswold wrote:
>> I am using DigiPan to play PSK31 with my KX3. In the DigiPan
>> waterfall, it looks as though someone has dragged a comb through it,
>> with trace alternating with dark space showing no signal. I went
>> through the menu changes I had made, and when I toggle between Dual
>> RX Off and Auto, the PSK display changes. I have posted a picture
>> http://www.kk1x.net/photos/psk.jpg for those interested.
>>
>> I'm curious to know why this is - now that I know why it happens, I'm
>> pleased, but I wonder if anybody on the list could explain it to me.
>>
>> Thanks & 72,
>> John KK1X
>>
>
>

--
+---------------------+
|John Griswold, KK1X  |
|[hidden email]        |
|(M)[phone]   |
+---------------------+

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Elecraft mailing list
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