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K3S question

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NOEL POULIN-2

K3S question

Hello,

My call is VE2FWW and VE2RYY.

I was working in the Makrothen rtty contest during the last week-end.

I noticed something may be wrong with my K3S.

When I came near a strong signal, I had the impression that I was
loosing reception....or sensibility????

Could it be the AGC....

Here are the settings of the AGC in the K3S

AGC DCY= soft

AGC HLD= 0.05

AGC PLS= NOR

AGC SLP= 010

AGC THR= 010

AGC F=120

AGC S = 120

I would appreciate comments about that problem...

Thanks

Noel ve2fww, ve2ryy

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Don Wilhelm

Re: K3S question

Neil,

Yes, I suspect it is the AGC. To determine the best settings for your
particular location noise, I suggest you read the "Noisy K3" article on
my website www.w3fpr.com.

73,
Don W3FPR

On 10/14/2019 1:36 PM, NOEL POULIN wrote:

> Hello,
>
> My call is VE2FWW and VE2RYY.
>
> I was working in the Makrothen rtty contest during the last week-end.
>
> I noticed something may be wrong with my K3S.
>
> When I came near a strong signal, I had the impression that I was
> loosing reception....or sensibility????
>
> Could it be the AGC....
>
> Here are the settings of the AGC in the K3S
>
> AGC DCY= soft
>
> AGC HLD= 0.05
>
> AGC PLS= NOR
>
> AGC SLP= 010
>
> AGC THR= 010
>
> AGC F=120
>
> AGC S = 120
>
> I would appreciate comments about that problem...
>
> Thanks
>
> Noel ve2fww, ve2ryy
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]

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Dale Boresz

Re: K3S question

In reply to this post by NOEL POULIN-2

Hello Noel,

Which roofing filter did you have engaged at the time? If it was
significantly wider than the minimum bandwidth needed to accurately decode
a RTTY signal, then pumping of the AGC could occur which is likely what you
heard. I don't operate RTTY so I don't know which roofing filter would be
optimum, but I'm sure other RTTY op's can help.

73,
Dale - WA8SRA

On Mon, Oct 14, 2019 at 1:37 PM NOEL POULIN <[hidden email]>
wrote:

Jim Brown-10

Re: K3S question

On 10/14/2019 12:05 PM, Dale Boresz wrote:
> I don't operate RTTY so I don't know which roofing filter would be
> optimum, but I'm sure other RTTY op's can help.

An IF bandwidth in the range of 400-500 kHz is recommended because it
presents the least phase shift to the decoding software. My radios have
2.8, 2, 0.4, and 0.25 kHz roofing filters. My standard IF setting for
RTTY is 500 Hz, so I'm using the 2 kHz roofer. In the presence of strong
nearby signals, I'll narrow it up to 400 Hz so the the 400 Hz roofer
kicks in.

73, Jim K9YC
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