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Old 01-02-2015, 08:32 AM   #1
Suprawill1
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Default FUTABA R168DF Rx

Happy New year All!

This is an 8ch dual conversion 72MHz Lo-Hi band Fm Rx. This Lo-Hi band can accept channels 11-60, 11-35 being low and 36-60 being high. I found a used one on ch 35 which is low but I have a xtal on ch 41 which is high.
My question is, can I just drop my 41 in? Even though this is a lo-hi band Rx, I read that you can't swap a high for low band ch and vice versa because the receiver would be tuned for the other band. That raises another question. If I bought a new one, sellers are telling me I can drop this 41 in but wouldn't the Rx be untuned for either band?
Thanks for your thoughts!

Will
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Old 01-02-2015, 01:23 PM   #2
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The hi/low band (which half of the 72 mhz band) issue never was very serious. Futaba is the only maker I know of that even bothered to mark their RXs

Actally the more common issue is that there is an expected deviation between crystals labeled for the same frequency and for that reason some RXs had a 3 dot code indication if it was tuned for lower, middle or higher end of range crystals. But even that wasn't a serious concern unless you were looking for extreme range.

I would expect no problems for normal use just dropping in the crystal.... if its the correct type.

Note that some brands ussed different frequency multipliers in the RX adn without a list of which brand used which multiplier in which RX you need to ensure that you have a crystal that is approved by the maker for that model RX.
For example: Never put a JR crystal into a Futaba RX... the radio simply won't be tuned correctly. It might not find the TX at all.
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Old 01-02-2015, 07:23 PM   #3
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Thanks for the hit. I guess I'll have to see if my xtal is compatible with Futaba. It's a VamPowerPro.
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Old 01-02-2015, 09:12 PM   #4
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You'll have to peel the label and find the actual crystal frequency... then find a Futaba crystal for the same "channel" and compare.

Or spend the about $10 to order the right crystal.
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Old 01-02-2015, 10:34 PM   #5
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Originally Posted by fhhuber View Post
You'll have to peel the label and find the actual crystal frequency... then find a Futaba crystal for the same "channel" and compare.

Or spend the about $10 to order the right crystal.
Doesn't seem like there's going to be any problem. The VamPowerPro works fine in my R168DF but this Rx is having issues and is the reason why I want to swap it out. I called Futaba and they told me that it should work fine. They said as long as the Rx is seeing the Tx, (which it is) the xtal is doing it's job. The range is the job of the Tx and Rx. Just make sure that I do a good ground range check and as long as the xtal is firmly seated, it will be good in the air. I'll probably use my 50mm F-16 for a test flyer. Then I'll put the 70mm in the air.
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