I tried different locations of the Synergistic router and its antenna; tried angling them to other positions, to no avail . . .
SR’s router doesn’t have antennae. It doesn’t have WiFi.
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A technical note excepted from SR’s router page.
Important Note: The Synergistic Research Network Router UEF does not include internal WiFi functionality. This deliberate omission ensures optimal performance by keeping the WiFi signal isolated from the Network Router. If your system requires a wireless connection (phone, tablet, etc.), it is necessary to connect a separate access point to the SR Network Router UEF.
A WiFi router is not the same as an access point. A WiFi router will not work. We have extensively tested various access points and found that different models seem to have minimal impact on overall performance. Two easy to set up recommendations are the TP-Link EAP245 and NETGEAR WiFi 6 Access Point (WAX214). When setting up your Access Point, set a different SSID than your existing home network.
Perhaps, the problem was with the component providing the access point. Or the SSID wasn’t configured correctly. Or a WiFi router was used, not an access point.
Over the years, I've purchased several SR products from Scott Walker, He and his sales team are usually very thorough with their customer support for equipment set-up and usage. Ever since I've converted over to SR cabling, the SQ of my system has improved signficantly.