Re: Digest for sdc-ut4lw@googlegroups.com - 2 updates in 1 topic

[Paul Ecker]

I have also found you  can turn SSDR DAX & CAT off when using SDC. In fact for me, if DAX is on I get no power out of radio when I Tx in SDC

73

Paul w2eck

On Mon, Aug 31, 2026 at 12:53 PM <sdc-...@googlegroups.com> wrote:

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• RTTY Distortion - 2 Updates

RTTY Distortion

Rick Harrington <rh7...@gmail.com>: Aug 31 06:52AM -0700 I've been away from contesting (and SDC) for a few years and I'm back trying to get SDC v19.07 and Flex SSDR v. 4.2.20 to play nice. CW is working fine, but RTTY is not.   I've been through the current setup manual. I'm hearing the radio via Rig Audio through my PC speakers with DAX closed. All the ports that should be connecting show the blue plugs connected. I'm still having these issues that I hope someone can help me with.   1. I put SSDR in DIGU mode as instructed but it tries to default back to RTTY mode. My guess is that I have something misconfigured from my prior setup but I can't locate a setting that would control that.   2. The major issue--once I get the Flex to transmit in DIGU, there's a loud distortion mixed in with the tones as confirmed by monitoring the signal with a second slice. (This happens in RTTY mode as well). The SDC RTTY waterfall shows both the tones and the distortion.   Suggestions appreciated! Rick N0VT

UT4LW Yuri Pavlov <ur4ix....@gmail.com>: Aug 31 07:14AM -0700 Rick, you don't need to select the modulation type on the transceiver. The SDC-Contest program will do this automatically: For RTTY, the RTTY modulation type will be set automatically; for BPSK, it will be set to DIGU/DIGL. ... The DIGU option for RTTY is required for transceivers that do not support RTTY. Flex-6/8 + SmartSDR supports this mode. SDC is constantly updated to accommodate changes in SmartSDR. Therefore, always use the latest versions. Today: 19.0710.

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