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<blockquote data-quote="CyberSimian" data-source="post: 1295343" data-attributes="member: 141969">That is weird <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite9" alt=":eek:" title="Eek!&nbsp; &nbsp; :eek:" loading="lazy" data-shortname=":eek:" />. I must remember that as a possible cause if others have a similar problem in the future.One possible explanation is that the outgoing cable was acting as a notch filter. It is possible to create a simple notch filter for RF frequencies by connecting a piece of co-axial cable via a &quot;T&quot; junction. The length of the T piece determines which frequencies are cancelled out. Perhaps the circuit layout on the TBS card made the outgoing cable appear electrically as a T piece, and it was exactly the right length to cancel out the DVB-T2 MUX. See <a href="http://www.hb9amo.net/hfcoaxialfilter.php" target="_blank">this page</a> for more details about notch filters.Anyway, I am glad that the problem is now fixed. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile&nbsp; &nbsp; :)" loading="lazy" data-shortname=":)" /> -- from CyberSimian in the UK</blockquote>

[QUOTE="CyberSimian, post: 1295343, member: 141969"] That [i]is[/i] weird :eek:. I must remember that as a possible cause if others have a similar problem in the future. One possible explanation is that the outgoing cable was acting as a [b]notch filter[/b]. It is possible to create a simple notch filter for RF frequencies by connecting a piece of co-axial cable via a "T" junction. The length of the T piece determines which frequencies are cancelled out. Perhaps the circuit layout on the TBS card made the outgoing cable appear electrically as a T piece, and it was exactly the right length to cancel out the DVB-T2 MUX. See [URL='http://www.hb9amo.net/hfcoaxialfilter.php']this page[/URL] for more details about notch filters. Anyway, I am glad that the problem is now fixed. :) -- from CyberSimian in the UK [/QUOTE]

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