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]> 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 so I need the recommended antenna length. > > > TIA > > David Z That sounds about right. The calculation for a 1/4 wave antenna is len (in feet) = 234/freq (in mhz). Based on that I ran the numbers and got 39"... 234/72 = 3.25 feet or 39 inches I'm sure the matching network adjusts for the extra inductance in the antenna from it being a bit to long. One thing I have not included was the velocity factor of the wire antenna which may have little or no effect, but would quite possibly shorten the antenna even more. I'd feel safe at 40 something inches. Kurt RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format
