----- 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, 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 the wave length using a formula above and then divide by 4. For example 72.000 MHz frequency band generically, ignoring decimal 1/4 Wave = 1.0409 meter (1040.9 mm) 1/4 Wave = 40.982 inch 72.270 MHz frequency, specifically 1/4 Wave = 1.0370 meter (1037.0 mm) 1/4 Wave = 40.829 inch Higher the frequency, shorter the antenna. Note that the computed lengths are total, not just the portion sticking out of the receiver case. Total length will include any wire inside the case plus the length of trace on the PC board. Regards, Tim 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
