I use small 2 watt attenuators with male BNC on one end and female on the other. There are various manufacturers and I see them often at hamfests. You'll find them anywhere from $0.25 to $10.00 each. Shop wisely and test the ones you get to make sure they haven't been smoked. I use two of these 3 db pads on my little Bird Termiline 250 milliwatt wattmeter which is a great tool for testing Mastr II exciters.
73, Tony W4ZT Brent wrote: >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 >> >> >> >> > > > > > 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/
