Conversion? - RCCanada - Canada Radio Controlled Hobby Forum
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Old 05-15-2010, 05:40 AM   #1
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I am: Rob B
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I bought a Receiver pack a while back that had all the features I needed and then said "SINGLE CONVERSION" ... whatever...

When I finally put it into an AC I installed the Crystal that came with the kit and started to align the servos. Nothing worked, I Changed the battery the servos, checked the shift of the Transmitter - nothing cured my problem.

In desperation I went to my Local Hobby Shop & Guru - he repeated all of my tests to no avail. Finally he changed the crystal - no luck.

THEN he looked at the receiver and noticed the notation "SINGLE CONVERSION", checked th colour of the tags on the two crystals (BLUE) and said; "That'll do it."

"DO WHAT?!" I Exclaimed

"You have a Dual Conversion Crystal in a Single Conversion Receiver." ..."Here install this one" (GREEN Tag)

...and the radio worked...

Somehow over the past decade of flying, Single & Dual conversion never came up in the conversation - there is a difference, and now I'm going flying to make myself feel better.
Life is either a daring adventure...
...or nothing.
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Old 05-15-2010, 08:02 AM   #2
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I am: Gary L
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Re: Conversion?

Glad you got it solved.

Another caution is to stay with the radio system manufacturers recommended crystals. You cannot tell what internal tuning was designed into the system and each manufacturer will likely be wildly different, their crystals taking that into account.

I have to deal with this even in my Futaba PCM receivers. The standard PCM uses a Dual Conversion crystal, whereas the 146iP I run in most of my helis are all Single Conversion.

On a side note: All the Futaba compatible receiver I've worked with, (ESKY, Eflite, etc.) use S/C crystals.
I know there's money in aviation........I put it there!
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