Can anyone tell me which siltronix vfo is the correct one for my Sonar fs 3023. Im almost sure it's the 90 just don't know the number that comes after the - that appears after the number 90. It's located on the back of the vfo. Example 90-3. 90-5. 90-7. Which one do I need? Thank you. NotStellA P.S. can't wait to get on the air!