----- Original Message -----
From: "Al Williams" <alwilliams@olywa.net>
To: <towertalk@contesting.com>
Sent: Thursday, January 10, 2008 2:02 AM
Subject: Re: [TowerTalk] Bandpass Filters
If one has a bandpass filter such as Dunestar or ICE and
switch it in for rx
and out for tx, is that good enough or is there really a
filtering advantage
of transmitting through the filter when nearby ax's have
their filter in
place?
k7puc
---------------------------
You need a bpf on the transmitter also. Synthesized
transmitters generate broadband cw (continuous, while in
transmit mode) hiss that spans several bands, so the hiss
would be heard even with a filter on the rx. For example, a
tx on 20m will generate hiss on 15m, which will be heard,
even with a 15m bpf on the rx, because the 15m hiss is
in-band.
Dave Hachadorian, K6LL
Yuma, AZ
.
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