The WA-COM 642 duplexer are Bp/Br cavities. The bandwidth is already limited. Are you saying a 7th cavity adding further loss? And why limit the gain? I remain teachable.
"Those that don't know, ask..." --- In [email protected], "Ralph S. Turk" <w7...@...> wrote: > > You would still need a pass cavity in front of the Preamp. Unless the Helical is similar > to the old Motorola vintage L, H or M receivers the cavity is still needed to limit the bandwidth > going to the preamp. You might also need an attenuator after the preamp to limit the gain. > Ralph > ----- Original Message ----- > From: "Bob Ricci " <b...@...> > To: Repeater-Builder@ yahoogroups .com > Sent: Wednesday, February 4, 2009 2:08:14 PM GMT -07:00 U.S. Mountain Time (Arizona) > Subject: [Repeater-Builder] Hamtronics Helical Resonator Preamp or Advanced Research Preamp > > > > > > > Hamtronics has a preamp with a helical resonator with a 18dB preamp. I > am at a high elevation with noise all around me. Advanced R3esearch has > a 24dB preamp with a low NF and 1dB compression point. Either would be > behind a WACOM 642 6 cavity duplxer . > > Which would be the better approach? The ultimate goal is to improve > reception of handhelds in a mountainous region. > > > __ ._,_. __ _ > Messages in this topic ( 1 ) Reply (via web post) | Start a new topic > Messages | Files | Photos | Links | Members > > > > Yahoo! Groups > Change settings via the Web (Yahoo! ID required) > Change settings via email: Switch delivery to Daily Digest | Switch format to Traditional > Visit Your Group | Yahoo! Groups Terms of Use | Unsubscribe > > > > Recent Activity > > ⢠> 15 > New Members > ⢠> 1 > New Links > ⢠> 1 > New Files > Visit Your Group > > > > Sell Online > > Start selling with > > our award-winning > > e-commerce tools. > > Group Charity > > Be the Change > > A citizen movement > > to change the world > > Special K Group > > on Yahoo! Groups > > Join the challenge > > and lose weight. > . > > __ ,_._, __ _ >
