|
|
|
23cm AM ATV DX Chart
Total gain in dB = sum of Transmitter antenna gain in dBd (gain over a dipole) plus Receiver antenna dBd gain minus transmitter and receiver coax losses. Figure 1 dB coax loss per 20 feet for Belden 9913 or Times LMR400. If 4 MHz deviation FM ATV add 12 dB; if your downconverter or preamp noise figure is more than 2 dB, subtract each dB above 2. For power levels inbetween the diagonal lines, add or subtract dB's - ie. add 3 dB each time you double the power. The power level diagonal lines were chosen to reflect the output of our 50-100 mW RTX23-.1 Transmitter or added Downeast Microwave linear amplifiers. The 3 watt RTX23-3 AM ATV transmitter would add 4.7 dB to the total gain when using the 1 Watt line. Check eBay and QRZ.com On Line Swapmeet for our older models.
Example #1: AM ATV repeater transmitter running a RTX23-3 driving a 2318PA Downeast linear amp, 100 ft LMR400 coax, Diamond U200 omni being received by a Directive Systems 2424LYRM Loop Yagi, Downeast 23LNAWPQ antenna mounted preamp and TVC-12S downconverter.
Example #2: A FM ATV point to point link using a Videolynx Z23B driving a Downeast 2318PA and OAL OAL TCR-23cm corner reflector to transmit, receive with a 2424LYRM Loop Yagi, antenna mounted Downeast 23LNAWPQ preamp and a 23/33FMR-3 receiver. Tom O'Hara, W6ORG |
Information about this server Artsci inc. |
copyright ©2011 W6ORG. all rights reserved. Webmaster contact: ATVinfo at hamtv dot com. |