Diamond X-30 Tuning

[FakeJake]

I don't think you need to break them apart, from what I remember. You can unscrew the internal element and SO239 from the bottom of the assembly...

Different makes/clones may vary

[GeeFull]

I don't think you need to break them apart, from what I remember. You can unscrew the internal element and SO239 from the bottom of the assembly...

Different makes/clones may vary

That's very true, usually the "guts" and socket can be withdrawn out of the bottom metal "hub", with the removal of the odd grub screw or two!
It's how they final assemble them in the first place, as opposed to gluing the fibre glass bit onto a sealed bottom block unit!
I have had many Diamonds, Comets, Moonraker etc. amateur radio white sticks apart for repairs in the past.
Only one I have ever come across "fully sealed" and not easily disassembled, was a "Decca" branded, VHF marine radio white stick.
But I am sure there must be others.

[DaveP]

The Diamond X-30 is pre-tuned I would not try and alter the antenna. I assume you have calculated the length of coax so it is also resenant on the frequency. It should be in equal half waves plus a quarter and it depends on the coax used due to the volosaty factor, exactly what a half wave length should be. Might I suggest you visit M5BXB web site it has loads of information including a coax calculator, that can be down loaded and used at any time. Once you have your coax resend the the SWR will drop dramatically. I use the X-300 with similar SWR readings as you, as I as using a random length of coax, Steve (M5BXB) gave me the calculator and I trimmed my LMR 400 to the nearest length which worked out to 18 Half waves plus a quarter, my SWR is now 1.2.1 over 2 meg.
73's Dave