Sorry if this has been asked and answered previously, but I dont find it in a check of the archives. Ill soon have an aluminum entry panel in my shack for all entering TX and RX lines (as well as rot
Hi Bill, The antenna feed point is where common mode signals on the outside of coaxial cable shield most easily and severely degrade antenna directivity. This a critical antenna performance issue for
Hi Mark, It can be very challenging to reduce common mode adequately to preserve the directivity of low signal level antennas such as the YCCC 9 circle. My preferred approach is to bury all cables in
W3LPL said "A peripherally related issue: Running DC power through the same coax cable as low level RF signals is asking for trouble." I agree completely. Here is my story of trying this. Maybe this
My DX Eng 4 sq (12v over RG6 to preamps) has had infuriating random arc noise for years and the W3LPL explanation makes great sense to me as the reason. I did silicone grease the F threads but follow
Author: CUTTER DAVID via Topband <topband@contesting.com>
Date: Mon, 5 Oct 2020 17:43:30 +0100 (BST)
I've seen Cat 5 and 6 cable used up to 20MHz on one pair, power on another and data on a third, perhaps switching on a fourth pair. I know this works for distances of at least 20 metres and I wonder
On 10/3/2020 11:24 PM, donovanf@erols.com wrote: Double shielded coaxial cable or hard line coax with properly installed high quality coaxial connectors greatly minimize the penetration of common mod