jason porter Posted May 17, 2020 Author Report Share Posted May 17, 2020 I ran a short length of rg58 (I believe) + BNC-F from the front (soldered) to the 'back'. I added zip ties to hold the cable. Mostly for strain relief and to accomodate good RF cable & BNC connectors (vs SMA connectors) Quote Link to comment Share on other sites More sharing options...
Paul F Posted May 19, 2020 Report Share Posted May 19, 2020 Thanks. My question is, why did you run a piece of RG-58 to the back of the antenna? Why not just directly connect the receiver with one cable from the front as shown in my sketch? I want to know if there is a technical benefit to adding this short stub of coax. Quote Link to comment Share on other sites More sharing options...
jason porter Posted May 19, 2020 Author Report Share Posted May 19, 2020 1 hour ago, Paul F said: Thanks. My question is, why did you run a piece of RG-58 to the back of the antenna? Why not just directly connect the receiver with one cable from the front as shown in my sketch? I want to know if there is a technical benefit to adding this short stub of coax. See post #35 by Larry F (Lectrosonics) Quote Link to comment Share on other sites More sharing options...
Paul F Posted May 19, 2020 Report Share Posted May 19, 2020 Excellent. Thank you Jason and Larry. Quote Link to comment Share on other sites More sharing options...
Paul F Posted June 29, 2020 Report Share Posted June 29, 2020 I made up two of Kent's LPDAs. I made one with the SMA connector facing down as shown in my sketch (post 50) and one with the SMA and coax mounted along the spine of the LPDA as most people do it. Using an Anritsu spectrum analyzer, I didn't measure a meaningful difference; 1db improvement (at best) dressing the coax to the back. I did not solder the coax to the spine as Larry specifies in post 35. Kent said not to solder the coax to the spine if dressing to the back. It isn't clear from Larry's notes how to solder the coax to the spine; all along the length or just at one point? Quote Link to comment Share on other sites More sharing options...
mark kirchner Posted June 30, 2020 Report Share Posted June 30, 2020 Paul, See post number 40. I think it will answer your question. mark Quote Link to comment Share on other sites More sharing options...
Paul F Posted June 30, 2020 Report Share Posted June 30, 2020 Ok, thanks. That confirms my findings. No need to run a coax to the back. Quote Link to comment Share on other sites More sharing options...
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