[Elecraft] Fwd: FT5000 PIN Diodes

[Edward R. Cole]

For operating as WD2XSH/45 on 495.6 KHz,  I connect thru the KVX3A Tx 
and Rx terminals, and run in "TEST" mode so I bypass the HP filter to 
get good sensitivity below 600-KHz.  I added a Clifton-Labs BC Band 
filter to suppress BC stations on the lower end from spattering down 
into 500-KHz (essentially raising the noise floor).

73, Ed - KL7UW & WD2XSH/45 (FCC experimental license)

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Message: 40
Date: Mon, 15 Nov 2010 15:55:48 -0800
From: Wayne Burdick <n6kr at elecraft.com>
Subject: Re: [Elecraft] Fwd: FT5000 PIN Diodes
To: Karl Marderian <karlmar at sbcglobal.net>
Cc: "elecraft at mailman.gth.net" <elecraft at mailman.qth.net>
Message-ID: <5857918D-B16D-4581-9955-655362C7E93B at elecraft.com>
Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes

Hi Karl,

I think there are a few issues to clear up here.
----snip---

First, we incorporated a high-pass filter into the T/R switch. It
rolls off signals below 1 MHz to ensure that extremely strong signals
in the 500 kHz range or below are attenuated. The attenuation at 500
kHz is about 20-25 dB. This is not a problem for casual broadcast band
DXing.

However, we also provide a way around the T/R switch: the RX ANT IN
jack on the KXV3 or KXV3A module. Most broadcast-band enthusiasts
connect their low-band receiving antenna directly to RX ANT IN,
bypassing the high-pass filter. If you still have a particular station
that's a problem, you could use an external notch filter in line with
RX ANT IN.

73,
Wayne
N6KR





73, Ed - KL7UW, WD2XSH/45
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