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You picked a tough one. From cbtricks.org I found out that's a TC5080 PLL. So it _might_ be similar to the Cobra 132XLR or Tram D62 on the inside. May take posting a board number to find out if there's any sister radios you can use the manual of.
Coax question. I just put up a new Sirio monsoon base antenna with 100’ of rg8u coax testing with myMFJ antenna analyzer shows 1.4 swr at 26.965mhz and a 1.1 at 27.405 mhz . When I checked the ohms it’s steady a 30 ohms across the entire bandwidth.
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