Reports of echo on ssb

  • 2
  • Problem
  • Updated 5 years ago
  • Solved

I have had reports of a very faint echo on my transmitted SSB audio.  What confuses me is that it is present at the 100 watt level but goes away when I put my Ameritron ALS-600 on line.  Hence, it does not appear to be RF in the audio related.

Running a Flex 6300 and SSDR 1.3.84.  Also using the Flex-supplied Heil balanced to Foster connector cable.  Mic is a PR 781.  The radio is connected to my I7 computer running Windows 8.1 via a D-Link gigabit router.  I have 31 mix torroids on the mic cable, speaker cables (sharing Bose Companion IIs with my Flex 5000), power supply in/out cables, etc.  The antenna (GAP Voyager IV) is at least 100 feet from the house.

Any ideas?

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Bill Roberts

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  • Just fine!

Posted 5 years ago

  • 2
Photo of Bill Roberts

Bill Roberts

  • 226 Posts
  • 46 Reply Likes
Official Response

Think I found the cause...  the BOSE Companion II speakers!  If I have two sets of cables going into these speakers (regardless of "side" as in left L&R input VS the pair on the right side) I have rectified and amplified RF.  If I disconnect one set of cables (from either right or left) the RF goes away.  This happens on all HF bands (160 - 20) that I have antennas for.  It happens with or without my 600 watt amplifier.  I have interchanged the shielded "powered speaker cables" that came with the speakers and the Belkin ones I bought two weeks ago.

So apparently, the un-elegant solution is to connect only one set of audio output cables at a time; plug in the 6300 when I want to use it and the 5000 when I want to use it.  BTW, both sets of audio cables are wound around large split beads at both ends.  Also, both radios are connected to the same ground bus.