Cost is about 75-80 bucks to get you a really accurate frequency standard. This can be the standard derived from the GPS system or something like this. You can input a reference 10 MHz on the rear panel. If it doesn't then something has gone wrong somewhere (duh!! You think?). The frequency adjustment on the IC-7800 should give you some definite change in frequency as you monitor it. For the TS-590S you can get a TXCO and should be able to adjust it to 2-3 Hz and have it remain there on the 15 MHz check with WWV. It mathematically goes farther out as you increase frequency. I have a TS-590S and it's off at 34 Hz on the 10 MHz WWV check point and is off by 42 Hz on the 15 MHz check. I know some folks are just wanting their rig to read exactly the correct frequency. That's not much and is well within the tolerance of the IC-7800.ĭo you have some specific reason why an accurate display is needed? You posted the frequency is off by 20-30 Hz.