[ve1mam]

How can i tell the difference between the hi or the lo Futaba rx? How or where can i have the procedures to tweek them to the frequency i need??

[Max]

Usually there is a label on it that indicates its bias.

if not, then you have to go by the channel that was in it initially.

[ve1mam]

here's what i just found:
If you will pull out your receiver crystal, look into the slot where it goes, you will see the backside of a PC board. If you see a red dot on the PC board then your receiver is High Band. No red dot? Then it is Low band.

If you have an R148DF/DP or R149DP there is a coil directly inside the crystal slot, if you will look at the coil closest to the antenna, this is where the red dot will be if you are on High band. Otherwise if there is no dot, it is again Low Band.

[Spitball]

I had been told that was the case but never checked it out - thanks, that's good to remember.
No wonder I never saw one, all my Rxs are LO band!!
I wonder if there is the same kind of distinguishing mark in the TX?

[Max]

Originally Posted by ve1mam

here's what i just found:
If you will pull out your receiver crystal, look into the slot where it goes, you will see the backside of a PC board. If you see a red dot on the PC board then your receiver is High Band. No red dot? Then it is Low band.

If you have an R148DF/DP or R149DP there is a coil directly inside the crystal slot, if you will look at the coil closest to the antenna, this is where the red dot will be if you are on High band. Otherwise if there is no dot, it is again Low Band.

Good to know! I never knew that. I learn something new every day on RCC

[dean2287]

Does the antenna color have anything to do with it? I noticed that one R127DF receiver I have has a black antenna, and it is low band. The rest have white antennas and they are high band.

[Spitball]

Not that I know Dean.

[dean2287]

One odd thing is that I have been using a low band Rx with a channel 44 crystal and it was working. I didn't even realize that it was low band until I removed in this winter!

[chuebner]

Originally Posted by dean2287

One odd thing is that I have been using a low band Rx with a channel 44 crystal and it was working. I didn't even realize that it was low band until I removed in this winter!

Could that possibly be the reason you were having some glitching problems last year??

[waynepinke]

Chuebner's statement is probably quite valid. Attached is a direct quote from one of Futaba's FAQ's about receivers. They "fine tune" them to one of the 2 ranges (probably for more reliabilty to their standards). Using a channel for the wrong range could cause some problems. Their answer is about "MOST" of their receivers because their later versions (I think it's the PCM receivers) state on the label that they are used for hi & lo ranges.

"Please explain Hi and Low band to me? I am not sure what the difference is between them."

"MOST of our 72MHz receivers are now tuned to the center of either a low band frequency (channel 11 to channel 35) or high band (channel 36 to channel 60).

By tuning to each band, you can easily and safely change your receiver crystal to anywhere within this high or low band range, without having to send it in to be retuned.

If you have a receiver that is not marked as to which channel it is, or if it is not marked with a sticker that says if it is High or Low, you can check inside the crystal slot to see if there is a red mark. If there is a red mark, this indicates that the receiver is High band."