crystals is there difference depending on r/x - RC Groups
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Feb 06, 2003, 11:13 AM
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crystals is there difference depending on r/x


are cyrstals the same in single and double r/xs can the same crystal be used in ethier ?
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Feb 06, 2003, 01:42 PM
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Don Sims's Avatar
Welcome to R/C Groups!! No you can't use a single conversion in a double. Plus different MFG have different sized crystals.
Don
I was told a single would work in a dual but it didn't work for me when i attempted it.
Feb 06, 2003, 03:05 PM
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Andy W's Avatar
What he said. Dual and single don't mix, and don't mix manufacturers either..
..a
Feb 06, 2003, 04:20 PM
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So you're saying I'm stuck with Airtronics rx'es? Not that that's bad, but there are cheaper.

BTW, I'm puzzled as to single and dual conversion. What exactly does that mean?
Feb 06, 2003, 04:26 PM
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Don Sims's Avatar
I do use Hitec crystals in my Airtronics receivers. From my very limited understanding...Dual conversion receivers have a better quality reception and "filter" transmitter siginals better. Single conversion take hits from other transmitters more, some events permit dual only and won't allow single. I use botha and do in fact have more problems with the single.
Don
Feb 06, 2003, 05:40 PM
Registered User
Would it be OK to use Hitec receivers, or even one of the "store brands"? It just bugs me that a rx itself runs almost $70, not counting the battery, servos, etc. For a lightweight setup it can run over $100 just inside the plane. Maybe I'm just not looking in the right place. I was adding up what I would need to get a Terry RTF, and came up to a little over $280. The combo from HobbyLobby was only $309. But I don't want that crummy radio they sell with it. [rant over]

Anyway, thanks for the info. I wonder if dual conversion sends it through a couple of filters, or something.
Feb 06, 2003, 06:26 PM
Registered User
Hi all I purchased an electro 6 hitec r/x LHS did not have but they gave me crystal. are there markings to indicate conversion. Regarding single vs dual In ancient days Voice radio [am] had devices known as IC,s. If my knowledge is correct they had three of these and they were used to refine the signal. those radios were know as triple conversion radios So I assume that in r/c single is only one refined signal. In dual R/X,s the signal is refined twice resulting in a clearer,cleaner more acurate signal
Feb 06, 2003, 07:21 PM
Registered User
Good question. Sometimes it says whether it's a single or a dual rx, and sometimes it doesn't. If I don't plan to do alot of flying at the club field for now, does it matter that much? Or does interference come from other sources?

I think that 'triple conversion' IC explanation is probably close enough. Sounds good to me.
Feb 06, 2003, 10:16 PM
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Andy W's Avatar
You can't mix brands of crystals and receivers. There's nothing wrong with using a different brand receiver than your transmitter. Make sure it's the correct 'shift' to receive the signal from your transmitter - positive and negative are the choices - Futaba/Hitec is one, JR/Airtronics the other. I use a Futaba transmitter, but use Hitec (mostly), as well as FMA, GWS, and MPI receivers.
..a
Feb 07, 2003, 04:06 AM
Registered User
Single and dual conversion get discussed quite often over in the Radios forum. A search will find you plenty of information.

There's no connection between that and what makes of receiver you can use with a transmitter. A transmitter will work with both SC and DC receivers, provided they're on the correct "shift".

Steve