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 similar exerience? Our theory was that we where compensating for the blancking (faradays cage) effect of carbon in our fuselages. Regards Mark ---------- Original Message ----------- From: [email protected] (Soaring) To: <[email protected]> Sent: Wed, 26 Jan 2005 06:21:43 -0500 Subject: Soaring V1 #5035 > 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
