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The GB7ZP Duplexer consists of a
Procom Cavity set (below) supplemented by a Procom BPF70/3 bandpass filter
on the 439.4875 MHz transmitter output. Click for alternate views: small,
large
The original design had poor screening and sensitivity - pictures below show the upgrades on coax and extra preamp
Before in 2008, Modified in 2010
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