On these bandpass cavity filters, would the Decibel Products DB4001- 1 be a good choice to use, and what would be the method of tuning them? Are they tuned to the transmitter output or the receiver input? Not at all familiar with tuning duplexers, as this is something I am now learning to do. Thanks.
Mathew > > The choice is usually between bipolar and GaAsfet, and depends primarily > upon the noise level at your repeater site. Sometimes, reception can be > improved more by using a higher-gain antenna and/or a lower-loss > feedline, than by adding a preamp. In any case, the best results are > achieved by adding a sharply-tuned bandpass cavity filter between the > duplexer and the preamp. Otherwise, the preamp will amplify a lot of > noise along with the desired signal, and is very vulnerable to overload. > > An excellent tutorial on preamps is at: > <http://www.anglelinear.com/repeaters/repeaters.html> > > 73, Eric Lemmon WB6FLY > > w9mwq wrote: > > > What type of preamps are available for VHF to enhance the receive of a > repeater? I know, if you can get by without it, it's better off, but > this is only a temporary attempt, to see if it makes an improvement for > the system for the winter. Also, if anyone has a good deal on one, let > me know off list on that as well. Thanks for the input. BTW, thanks to > all who have offered support this far; the repeater is coming along just > fine and is working quite well. > > > > Mathew > > W9MWQ > > > > > > Yahoo! Groups Links > > > > > > > > Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
