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Hi/Lo band

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Old 06-29-2012, 07:58 AM
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JollyPopper
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Default Hi/Lo band

I have two Futaba receivers with channel 36 crystals in them. One is marked "Lo BAND" on the side and the other has a red dot in the crystal slot indicating it is hi band. Did Futaba put channel 36 crystals in both hi and lo band receivers or has somebody been switching crystals in the receivers before I got them. These are not new receivers as they have been pre-owned, but I knew the gentleman who owned them and if they are used, they were used very gently. Unfortunately, I can't ask the previous owner because he was killed in an automobile accident on his way home from the flying field a couple years ago.
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Old 06-29-2012, 08:44 AM
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Default RE: Hi/Lo band

They were mixing and matching crystals.

Unless you're flying in busy environment at the edge of the receivers range I wouldn't sweat it.

Radio South or Futaba would retune them to the exact crystal you're using (tuning will also uncover any issues with the rx itself) for a reasonable fee if you want some cheap peace of mind.
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Old 06-29-2012, 06:26 PM
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Default RE: Hi/Lo band

35 is low band, 36 is high. I do not know if being out by 1 channel matters but I wouldn't risk it.
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Old 06-30-2012, 12:21 AM
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Default RE: Hi/Lo band


ORIGINAL: JollyPopper I have two Futaba receivers with channel 36 crystals in them. One is marked "Lo BAND" on the side and the other has a red dot in the crystal slot indicating it is hi band. Did Futaba put channel 36 crystals in both hi and lo band receivers or has somebody been switching crystals in the receivers before I got them. These are not new receivers as they have been pre-owned, but I knew the gentleman who owned them and if they are used, they were used very gently. Unfortunately, I can't ask the previous owner because he was killed in an automobile accident on his way home from the flying field a couple years ago.
35Mhz &36Mhz are treated as separate frequencies (same as 40MHz &41 Mhz).
. Both Tx &Rx are centre tuned within those two separate frequencies.
Hi/Lo Band refers to 72 MZ only, refer:
. Futaba - 72Mhz Hi & Lo Band Difference & Markings

more information available under sub section
"Radio Systems, Accessories, Alterations and FAQ" at
Alan's Hobby, Model & RC FAQ Web Links
which may well provide answers for further questions.

Alan T.
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Old 06-30-2012, 12:49 PM
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Default RE: Hi/Lo band

Al he's talking about US channels 35 and 36

Futaba center tunes on the lower or upper half of the band. So if have a low band rx thats center tuned to channel 23, and put a channel 36 crystal in, your 13 channels away from the optimal tuning channel.

If on the other hand you have a center tuned receiver (remember, that Futaba didnt do that on all recievers, just for a couple of years on certain models) like any other reciever out there, including most Futaba 72mhz systems, its tuned to channel 35 (the center of the band) and you can put a channel 59 or 60 crystal in it and it will work just fine, yet its now 23 or 24 channels away from its optimum tuning.

Hence my statement, given the stated circumstances, I seriously doubt he will find himself any worse off than anyone else flying a 72 mhz system. Now if he were going to throw that channel 59 or 60 crystal in it, then you might have a case of saying it's not a good idea.

Like I said, if you're that worried, just have it aligned to the actual channel you're flying on.
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