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Carl Clawson-3

Re: Seeting digital RX levels - was: ARRL Field Day

Indeed. For instance, my neighbor Ernie, K7EAJ, showed up on 80 m with a
PSK31 signal so horrible that I could not copy it at all. Splattered all
across the band. Why? He's too close! Once I turned my RF gain way down,
his signal was fine.

73, Carl WS7L

On Thu, Jun 27, 2013 at 1:03 PM, Bill Frantz <[hidden email]> wrote:

>
> Measuring IMD on a PSK signal is not as easy as it seems.
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Jim Low man

Re: Setting TX Levels for Digital Modes

In reply to this post by Jim Brown-10

Jim, would a RigBlaster be a better choice in the case that you
mentioned, instead of the SignaLink?

72/73 de Jim - AD6CW

> Another observation. A few years ago, I surveyed low cost USB sound
> cards sold for use in the home studio and DJ market, found several
> that looked promising, and bought two of them. Both made significant
> improvements in the DECODING of digital signals, and also cleaned up
> the computer's TX audio. These were NOT expensive units -- a little
> Numark unit ($35 at B&H Photo) worked just as well as a $75 Tascam.
> And, unlike the more expensive SignalLink, which has Pin One Problems
> that cause RFI, the Numark and the Tascam are free of these problems.
>
> 73, Jim K9YC
>

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Don Wilhelm-4

Re: Setting TX Levels for Digital Modes

Jim,

If you follow Jim Brown's advice in his RFI tutorial, you do not need to
go the the expense of a RigBlaster or SignaLink at all - a good quality
external soundcard will do the job at a much lower price.

Bond the computer and the radio together as Jim advises, and transformer
isolation will not be necessary, just a higher quality soundcard for the
computer.

OTOH, if you also want the other features of the Rigblaster, that is a
'horse of a different color' - the Rigblaster will do an adequate job as
a soundcard for digital modes (but it may not be the lowest noise level
soundcard).

73,
Don W3FPR

On 6/27/2013 8:56 PM, Jim Lowman wrote:

> Jim, would a RigBlaster be a better choice in the case that you
> mentioned, instead of the SignaLink?
>
> 72/73 de Jim - AD6CW
>
>> Another observation. A few years ago, I surveyed low cost USB sound
>> cards sold for use in the home studio and DJ market, found several
>> that looked promising, and bought two of them. Both made significant
>> improvements in the DECODING of digital signals, and also cleaned up
>> the computer's TX audio. These were NOT expensive units -- a little
>> Numark unit ($35 at B&H Photo) worked just as well as a $75 Tascam.
>> And, unlike the more expensive SignalLink, which has Pin One Problems
>> that cause RFI, the Numark and the Tascam are free of these problems.
>>
>> 73, Jim K9YC
>>
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ve3dvy

Re: Setting TX Levels for Digital Modes

In reply to this post by Jim Brown-10

Jim:
Wish I had read some of these articles you have many years ago would
have saved a lot of hair on my head.
Thanks!

David Moes

[hidden email]
VE3DVY

On 6/27/2013 12:28, Jim Brown wrote:

> On 6/27/2013 8:33 AM, WM3M wrote:
>> Could you please give me more info on the pin 1 RFI problem?
>
> Study the RFI link in my previous post. And more at
> http://k9yc.com/publish.htm
>
> 73, Jim K9YC
>
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EricJ-2

Re: Setting TX Levels for Digital Modes

Same here. I spent several hours going through them, and bookmarked
several for serious study. I learned more about ham radio from the
detector output to the speakers than I ever knew. Thanks, Jim.

Eric
KE6US

On 6/28/2013 9:55 PM, david Moes wrote:

> Jim:
> Wish I had read some of these articles you have many years ago would
> have saved a lot of hair on my head.
> Thanks!
>
> David Moes
>
> [hidden email]
> VE3DVY
>
> On 6/27/2013 12:28, Jim Brown wrote:
>> On 6/27/2013 8:33 AM, WM3M wrote:
>>> Could you please give me more info on the pin 1 RFI problem?
>>
>> Study the RFI link in my previous post. And more at
>> http://k9yc.com/publish.htm
>>
>> 73, Jim K9YC
>>
>> ______________________________________________________________
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>>
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>>
>
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>