Re: Is there a difference between a RF choke and a RF coil ?
From: George (nospam_at_mindspring.com)
Date: 12/04/04
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Date: Sat, 04 Dec 2004 19:46:18 GMT
I am wanting to shortin my RX wire on my RC radio sytem. The
schematic I found calls for a 1.5 uh Coil,
silver-Brown-Gold-Silver-Green You cut down the RX wire and leave 4
inches of wire on the RX, add the coil in series and add a 6 inch
piece of piano wire. The RC radio in on 72 Mhz channel 22 ( 72.230
Mhz) The original length of the RX wire is 38 1/8 inches. I have
found 1.5 uh RF chokes on Ebay, but not sure if they will work. I
would like to tune the RX antenna to 72.230 Mhz as close as I can, to
avoid signal loss.
Thanks
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On Fri, 3 Dec 2004 16:40:47 -0500, "Charles Schuler"
<charleschuler@comcast.net> wrote:
>Both have inductive reactance but are applied differently. A coil is used
>as one element in a tuned circuit. An RF choke is used to decouple circuits
>from RF ... they act as low-pass filters and can be used to block or isolate
>RF.
>
>The very same component could be either, depending on the application. Back
>in the bad old days of vacuum tube rectifiers, a filter choke was often used
>to block 60 or 120 Hz. ripple (so it does not have to be an RF application).
>Choke means to "choke off" the ac component that is not wanted.
>
>Generally, coils are selected to have a higher Q (inductive
>reactance/resistance) and chokes often are selected for size/cost.
>
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