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General Radio Freq/crystal question.

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Old 09-20-2003, 03:39 PM
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Pajo
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Default General Radio Freq/crystal question.

Newbie here.
I see that Europe/Uk Txs are 35mhz and U.S. Txs are 72 mhz.

But my question is, are a U.S. radio and a U.K radio identical apart from the crystal.

i.e if I got a Tx from the U.S. ( I know the chargers are different voltage)
would it be ok in the UK if I replace the crystal with a 35mhz one.
OR are the radio hardware different.
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Old 09-20-2003, 05:52 PM
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Default RE: General Radio Freq/crystal question.

ORIGINAL: Pajo

Newbie here.
I see that Europe/Uk Txs are 35mhz and U.S. Txs are 72 mhz.

But my question is, are a U.S. radio and a U.K radio identical apart from the crystal.

i.e if I got a Tx from the U.S. ( I know the chargers are different voltage)
would it be ok in the UK if I replace the crystal with a 35mhz one.
OR are the radio hardware different.
No, the TX modules are different it is not just a matter of changing Xtals.
Even among the 35 MHz TXs different Xtals are required. You must use the manufacturers Xtals for the TX to be on frequency and work properly.
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Old 09-21-2003, 11:46 AM
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Default RE: General Radio Freq/crystal question.

The entire Radio Frequency circuit is different between the two.

The RF circuit is designed for a specific frequenct range, and the crystal locks it in on the final frequency.
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Old 09-22-2003, 02:07 PM
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Default RE: General Radio Freq/crystal question.

Thanks for the replies m8s, thats what I thought but then I bought a brand new JR378 radio from a UK shop and when I recieved it I noticed the manual had a plain sticker on the back, and when I peeled it off, it had Horizon Hobby Inc, U.S.A. written underneath it, and there was a leaflet included, which said to ignore refs to U.S. frequencies, so I guess that they modify the U.S. radio, before they sell them in the U.K.
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Old 09-24-2003, 12:32 AM
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Default RE: General Radio Freq/crystal question.

ORIGINAL: Pajo
...I guess that they modify the U.S. radio, before they sell them in the U.K.
That modification would be re-tuning the RF deck for the U.K. frequency range.
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Old 09-24-2003, 06:58 PM
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Default RE: General Radio Freq/crystal question.

Pajo,

Just to clarify the siuation.... the 378 sold here in the UK ( and in the USA ) are modular. This means that the entire RF package is in a small module that clips into the back of the set.

BOTH variants ( UK & US ) are sourced from JR in Japan. Horizon very kindly did the translation of the manuals from Japanese to English then allowed JR to print and distribute their manual with the sets. MacGregor ( the UK distributor ) places that sticker on the back of the manual advising people of the change. For all intensive purposes they are the same set . We do not get the sets from the US, neither are they modified. We get a totally different module to the US, Australia, Germany etc etc.


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Old 09-24-2003, 07:10 PM
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Default RE: General Radio Freq/crystal question.

Further to that, the JR range of transmitters available in the UK vary in the RF makeup. The 6 series ( 642/652/662 ) and the 378 use an RF board where the Xtal fits in from the outside. ( The new set will also use a direct crystal plug in system when it arrives )

The 3810, 9X and 10X all use an RF Module. This allows flyers who fly in championships ( these sets are for experienced flyers btw ) all around the world to use one radio and various RF modules ( for that region etc etc ). The only major bugbear is that in the USA, FCC regulations stipulate that an authorised centre is the only one allowed to change the crystal !!!!!! EVEN if its one of the 6 series ! Can you imagine that over here ? Having to send your set back to macGregors to do a channel change ?????????????????????

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Old 09-25-2003, 02:28 PM
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Default RE: General Radio Freq/crystal question.

Thanks guys, I'm learning slooowly.
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