One way to make the antenna a little longer is to
add a wider bit at the top, say a copper coin,
or something like that. It will also receive a
wider spectrum ...
Having a very overlong antenna will improve
reception, as ham radio guys know, as
long as it isn't totally out of phase.
Ham guys
Hi All
We in South Africa are having a great deal of success extending the antenna on
our 35Mhz JR / Graupner receivers. Having performed the calculation below, I
come up with a quarter wavelength of 2,141M.
Would this explain why extending our antenna works so well? Does anyone else
have
The mentioned theories are good. But our RX's don't use resonant antennas so
the tuning of the antenna doesn't really matter too much. Use ~41 inches and
you'll be fine.
Bill Swingle
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A totally non-resonant antenna would transfer 0 power and you would
receive absolutly nothing.
-charles
On Wed, 26 Jan 2005, Bill Swingle wrote:
The mentioned theories are good. But our RX's don't use resonant antennas so
the tuning of the antenna doesn't really matter too much. Use ~41
On Wed, Jan 26, 2005 at 01:33:29AM -0600, Tim Engel wrote:
| If you're fussy, the correct antenna length depends upon the frequency.
|
| Wavelength = Speed of Light / frequency
| In meters = 299, 792.458 / frequency in MHz
| In inches = 11,802,852.6771654 / frequency in MHz
The problem here
Alright. SLOPPY Resonant. SIMON, help me out here.
The bottom line remains. Make the wire between 39 and 41 inches, plus or
minus an inch or two, and you'll be fine. It really won't matter. I've used
wires of ~24 to 50 inches and they worked fine. SLOPPY indeed.
By far the more important
You don't need my help :^)
An non resonant antenna length of 39 will work on all RX's operating @ 72MHz.
A couple of inches either way? I know I don't have the equipment here at work
sensitive enough (our SA's, NA's, FC's, are only around $45,000 ea) to measure
such a small change (dBm) in
If you're fussy, the correct antenna length depends upon the frequency.
Wavelength = Speed of Light / frequency
In meters = 299, 792.458 / frequency in MHz
In inches = 11,802,852.6771654 / frequency in MHz
Quarter Wave = Wavelength / 4
R/C receiver antenna are typically quarter wave, so compute
I need to add a new antenna to my Hitec 555. Broke the old one ages ago
so I need the recommended antenna length.
TIA
David Z
RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages
I have a new one and it measures 40.5 from the case..
- Original Message -
From: David Zucker [EMAIL PROTECTED]
To: soaring@airage.com
Sent: Tuesday, January 25, 2005 7:35 PM
Subject: [RCSE] 555 antenna length
I need to add a new antenna to my Hitec 555. Broke the old one ages ago
Date: Tue, 25 Jan 2005 21:06:01 -0800
From: Mike Reed [EMAIL PROTECTED]
To: soaring@airage.com
Subject: Re: [RCSE] 555 antenna length
Message-ID: [EMAIL PROTECTED]
I have a new one and it measures 40.5 from the case..
- Original Message -
From: David Zucker [EMAIL PROTECTED
- Original Message -
From: David Zucker [EMAIL PROTECTED]
To: soaring@airage.com
Sent: Tuesday, January 25, 2005 9:35 PM
Subject: [RCSE] 555 antenna length
I need to add a new antenna to my Hitec 555.
Broke the old one ages ago so I need the
recommended antenna length.
David
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