Thats what im looking for Better signal to noise ratio ! Right now it is amplifing more than what is needed. I will experiment with this 8 and 10db pads i have. I am interested in what type of pad people are using, since this preamp is mounted inside the mastr II vhf receiver when i received it its location might need to be or should be moved.. but if i intend to leave it there it has a bnc to rca jumper installed from the preamp to the receiver, and i would need to install the pad there. Brent
----- Original Message ----- From: "Tony King, W4ZT" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Thursday, March 24, 2005 11:22 PM Subject: Re: [Repeater-Builder] Desense im guessing? > > Cody Hayden wrote: > > >db pads are bandaids and not cures..get a better > >duplexer..problem solved.. > > > > > It is common practice to use 6 to 10 db of attenuation between a new > high gain (typically as much as +18 db) GaAsFET low noise amplifier and > an older receiver. The gain of the preamp is about 10 db higher than > you need for the receiver yet you can gain benefits from the low noise > front end and high intermod resistance. Placing the attenuator between > the preamp and the receiver doesn't hurt the noise figure yet keeps the > receiver front end input signal within acceptable limits. It doesn't > reduce the usable sensitivity of the receiver either. The attenuator > doesn't make up for deficiencies in a duplexer but it certainly can slam > the door on other problems many of us have faced with excessive gain > ahead of our older less sensitive receiver. The result is a much lower > noise front end with moderately higher gain. Bottom line: better signal > to noise ratio. > > >--- Brent <[EMAIL PROTECTED]> wrote: > > > > > >>One of my 2m repeater has a problem.<snip> > >> > 73, Tony W4ZT > > > > > > > > Yahoo! Groups Links > > > > > > > > --- > [This E-mail scanned for viruses at TNWEB LLC] > > > > > -- > No virus found in this incoming message. > Checked by AVG Anti-Virus. > Version: 7.0.308 / Virus Database: 266.8.1 - Release Date: 3/23/2005 > > -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.308 / Virus Database: 266.8.1 - Release Date: 3/23/2005 --- [This E-mail scanned for viruses at TNWEB LLC] 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/
