ORIGINAL: JasonWilliam
Ok, please someone correct me if I have this wrong:
A-it is illegal to change a tx crystal yourself, like the small pullout crystal found on the Futaba 6EXA
B-it is legal to change a module that houses the crystal like the Futaba 9C allows
C-it is ok to do B only if you stay within your low (12-34) or high (35-60) freq band
Question 1: I've read here many times that the low/high issue is probably just clever marketing. This thread seems to suggest otherwise?
Question 2: If Q1's answer confirms there is in fact a high and low band and once set from the factory, a device must remain in its band, can you plunk in a high band module into an originally low band tx, like the 9C again seems to allow?
Question 3: What about receivers? Must they also remain in their respective band?
Thanks guys. I've been looking for a definitive answer to these questions for a while now.
A: Correct
B: Correct
C: Incorrect. B is permissible on allfrequencies. You can even change to surface frequencies if you want if you're changing the whole module.
Q1: Not clever marketing, just different engineering. Most of the guys at my field operate on a single freq so they don't change much.
Q2: high/low band generally refers to receeivers that are pretuned for a specific band. A TX freq change must either user a tuned module or be retuned manually by a certified tech (in the USA)
Q3: Replace "MUST" with "SHOULD" and the answer is yes unless they are retuned. They will probably work either way, they just won't be "peaked" properly
Mark