Espritmodel.com Telemetry Radio
Reply
Thread Tools
This thread is privately moderated by Ribble, who may elect to delete unwanted replies.
Old Feb 23, 2012, 12:28 AM
Crash and learn
United States, PA
Joined Dec 2011
1,605 Posts
Discussion
Transmitter Power Output

TRANSMITTER POWER SETTING
EU limits output power to 100mW
US limits output power to 200mW = 200mW output power 2.4GHz RF

0dbm = 1mW
3dbm = 2mW
6dbm = 4mW
10dbm = 10mW
20dbm = 100mW
23dbm = 200mW

A Simple yet effective RF Sniffer
http://macgregor.co.uk/support/faq/gen-2.htm

2.4GHz Antenna 1/4 wavelength = 30.7mm = 1.21 inches
---

DH9104 & DH9100 TX schematic drawing (actually transmits 4 channels)
http://www.rcgroups.com/forums/showthread.php?t=1571121
Ribble is offline Find More Posts by Ribble
Last edited by Ribble; Sep 07, 2012 at 03:21 PM.
Reply With Quote
Sign up now
to remove ads between posts
Old Feb 23, 2012, 01:16 AM
Crash and learn
United States, PA
Joined Dec 2011
1,605 Posts
Motor Amps using battery MAH rating and flying time

Calculate motor amps from flying time

Motor amps ?
If you start with a full battery and get an accurate time how long the battery lasts, you can figure out the average current that the motor drew during those minutes.

Amps = (mah) x (1amp/1000ma) x (60minutes/1Hour) / (RunMinutes)
Amps = (mah) x (60/1000) / RunMinutes
Amps = 0.06 x mah/minutes

Example: Amps = 0.06 x mah / Minutes
Amps = 0.06 x 1000 / 6 = 10 amps average current
Amps = 0.06 x 1000 / 3 = 20 amps average current = 1000mah battery that lasts 3 minutes
Amps = 0.06 x 1300 / 3 = 26 amps average current
Amps = 0.06 x 1300 / 4 = 19.5 amps average current
Amps = 0.06 x 1300 / 5 = 15.6 amps average current
Amps = 0.06 x 1300 / 6 = 13 amps average current
Amps = 0.06 x 2000 / 6 = 20 amps average current = 2000mah battery that lasts 6 minutes
Amps = 0.06 x 2000 / 3 = 40 amps average current
Amps = 0.06 x 680 / 6 = 6.8 amps average current
Amps = 0.06 x 680 / 3 = 13.6amps average current
Amps = 0.06 x 900 / 6 = 9 amps average current
Amps = 0.06 x 900 / 3 = 18 amps average current

Well, more or less. Pick a ratio of MAIN/TAIL and apportion the total amps
A good ratio may be 3/1 where main = 75% and tail gets 25%
Ribble is offline Find More Posts by Ribble
Reply With Quote
Reply

Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion Futaba 4YF Transmitter Output Power Earl Boebert Radios 3 Jun 27, 2011 12:04 AM
Question Hitec transmitter output power??? Hovertime Hitec/Multiplex USA 1 Jul 07, 2004 05:48 PM
Question GWS transmitter output power??? Hovertime GWS (Grand Wing Servo) 11 Jul 06, 2004 04:10 AM
Different transmitter output power - what significance? Vic Peh Radios 1 Nov 08, 2003 07:28 AM
Power output of a typical Transmitter. Kevin Murray Power Systems 17 Sep 23, 2001 06:13 PM