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700 Class Electric Helicopters 700 Class Electric Helicopters manufactured by Align, Tarot, SYMA, Airhog, Chaos, HK and similar.


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Old 04-22-2011, 05:58 AM   #21 (permalink)
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Hi Rick, In most cases yes, however I can not confirm what side is which on the main case. I usually try to orientate my main receiver to get a clear signal path (clear air) to both wires on the main case, where ever possible. That said, if you look at the JR 1221, it only has one antenna on the main case, which I presume must be an active antenna. Sorry cant confirm this one for you re the main case. When I open the next one to do a repair for someone (usually new antenna wires), I'll take a look for us...

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Originally Posted by Rick Dizzle View Post
Wizza, Is that the same principle for the actual receiver too? You know the main unit not the satellite. Meaning that only the left wire picks up signal?
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Old 04-22-2011, 11:10 AM   #22 (permalink)
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Quote:
Originally Posted by Rick Dizzle View Post
Wizza, Is that the same principle for the actual receiver too? You know the main unit not the satellite. Meaning that only the left wire picks up signal?
I remember reading that on the actual main receiver, both antenna wires are active.
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Old 04-22-2011, 04:44 PM   #23 (permalink)
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Thanks guys!
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Old 04-23-2011, 03:06 AM   #24 (permalink)
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Originally Posted by RadDuke View Post
I remember reading that on the actual main receiver, both antenna wires are active.
Depends on which receiver, on spektrum systems their is 1 active antenna element per receiver. The other wire is connected to ground and is used for impedance matching. No rf is ever switched, signals are compared after they leave the receiver and the strongest is used.

What gets confusing is some spectrum receivers have a single receiver, others have two. The easiest way to check is to use a voltmeter and check continuity between the ground servo pin and each antenna stub. You will have no continuity on an active antennas (actual receivers).

All satellites are single receiver.
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Old 04-23-2011, 01:14 PM   #25 (permalink)
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Here is where i put mine, so far so good.
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