Futaba Hi-Lo Rx

Hi all

Any comments.

The powers that be in NZ have decreed that all frequencies above

72.5mHz are no longer to be used here (conflict with R/c cranes, log hawlers and rail shunting engines).

I was on 72.550mHz (Ch. 38 US) :-{ In process of moving to 72.250mHz (Ch. 23 US).

JR and FMA brand R/x (maybe others) can be used on any frequency in the 72mHz band. Futaba have Hi and Lo 72mHz R/x and say Hi band R/x with Lo (Ch. 23) crystal are not compatible.

Took all gear to the field and set up a test.

With T/x (aerial down) 30 paces away, tried every compatible combination. T/x module (Ch. 38 and 23 I have both for test), and Futaba R/x (Hi and Lo with R/x crystals for 38 and 23).

Found no problems with Hi R/x with Lo crystal installed.

At about 60 paces between T/x and R/x had jittering of servos with Hi to Hi combination as expected as well as Hi to Lo combinations.

Are Futaba being super cautious about Hi R/x - Lo crystal combinations. Any one regularly swap Hi - Lo crystals in Futaba gear.

Reply to
The Shaw's
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More of an issue in the US as there they share the whole 72Mhz spectrum unlike here in NZ. Remember in the US they can't even swap out Rx crystals without a pro retune because of using frequency spots that fall between those used by primary (money paying) frequency users.

Do a range check etc and if all is well fly!!


The Shaw's wrote:

Reply to
Sean McFarlane

This same subject came up a little while ago. I contacted one of the more reputable radio service centers (Radio South) here in the US. To paraphrase their response, as long as it ground checks OK, go for it!


Reply to

Not true in the US. If you use the same brand RX crystal, and follow the hi/lo band rule for Futaba, then you can change out receiver crystals all day long and not have to retune. Obviously, it's always smart to range check before a day of flying whether you changed the RX crystal or not.


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