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 " <[email protected]>
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.
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