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Futaba Dual Conversion Crystal or not?

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Old 08-01-2006, 03:38 PM
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zliu
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Default Futaba Dual Conversion Crystal or not?

Hi All:

I recently bought a Futaba FP-4NBF Tx with crystal at channel 26. Now I am trying get the right Futaba Receiver with RX crystal to match it.

According to the Futaba FP-4NBF Tx manual, it originally come with FP-R127DF receiver, which is dual conversion receiver.

Can I assume the crystal on the TX is also dual conversion crystal? or how can I find out?
Therefore, I have to buy a dual conversion receiver and crystal at channel 26 to match it.

Please advise.

Thanks.
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Old 08-01-2006, 04:00 PM
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carrellh
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Default RE: Futaba Dual Conversion Crystal or not?

Dual conversion or Single conversion applies only to receiver crystals. Your transmitter can control either type of receiver.

If you buy a single conversion receiver, you will need a single conversion receiver crystal (same brand as the receiver)
If you buy a dual conversion receiver, you will need a dual conversion receiver crystal (same brand as the receiver)

Futaba 72 mhz transmitters marketed in the US are "negative shift" so if you buy a receiver that is not Futaba you need to be sure it works with negative shift transmitters.

In the US market, Hitec & Futaba transmitters are negative shift. Airtronics and JR are positive shift. Hitec & Airtronics offer some models that are shift selectable.
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Old 08-01-2006, 05:38 PM
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Default RE: Futaba Dual Conversion Crystal or not?

Thanks a lot!

Now, it's depending the receiver I need to use with the TX.

If I go with a Futaba compatiable receiver, if it's single conversion receiver, use single conversion Rx Crystal.
If go with a dual conversion receiver, use the dual conversion RX crystal.

Another question, will the Dual conversion has better range or just less interference?

Regards,
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Old 08-01-2006, 09:37 PM
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Default RE: Futaba Dual Conversion Crystal or not?

All of Futaba's single conversion receivers list a range limit of 650 feet. Their dual conversion receivers do not list a range limit; so it is assumed to be "as far away as you can see the model."
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Old 08-02-2006, 08:25 AM
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Default RE: Futaba Dual Conversion Crystal or not?

Here's some reading for you

http://www.torreypinesgulls.org/Radios.htm

and

http://www.futaba-rc.com/faq/index.html
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Old 08-02-2006, 09:28 AM
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Default RE: Futaba Dual Conversion Crystal or not?

Thank you.

I am looking through the links now, it's very informative.

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