Gene -
RG-58 is 28.5 pF per foot, giving a total capacity of about 90 pF for the 38" length of the Drake cables. I've never tried it, because of it's size and bend radius compared to the audio cable used for the rest.
I know it works for the S-Line, and is what I use there. But the S-Line was designed for RG-58 cable in the RF circuits. The Collins cables are 48" long also, which makes the bend radius less of a problem.
RG-58 will probably work ok for the Drakes as long as you do the Injection alignment with the rigs connected.
Belden 8421 audio cable is 16 pF per foot and works just fine. It has a foam dielectric and is the same size and flexibility as the audio cables.
73, Garey - K4OAH Atlanta
Gene McCalmont wrote:
Good Morning Ken Garey Barrell's suggestions (K4OAH) are right on target. I too have experienced the same problem as have most of us on the list. Another option you may try is to substitute your current injection cables with RG-58. Mouser sells these cables with molded RCA plugs already attached. Although the capacitance is not quite on design target, it's close. Switching to RG-58 and repeaking the set cured my problem nicely. I also use this cable combination on all of my Collins equipment with equally good results.
Good luck and 73 de Gene
W5DDW Gene McCalmont 270 Oakridge Road Argyle Texas 76226 (940) 464-4474 Office (214)-502-0322 Cell
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