Return to KLUBNL.PL main page

rsgb_lf_group
[Top] [All Lists]

LF: LF Receiver

To: rsgb <[email protected]>
Subject: LF: LF Receiver
From: "lawrence mayhead" <[email protected]>
Date: Fri, 11 Jan 2008 18:45:19 +0000
Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=googlemail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to:subject:mime-version:content-type; bh=Ecipy6vFc9gdeimMVhxHrg7Wj+nOUdHsuznICV0HAJQ=; b=b7SW6pdlebOt0SbbyHfjfLvv9Asamy7nZgCMtDTQB5mzI0RIhoHooBHp/k5MUJXTJ4LYLxpCZD6W7lwzDNnk8kOqlQgxeMeDUB6yXBm8FgvVFJ/sPf4yFYofqQYa2+MvWnKmm9QUA+PLk3WckgeBxJVhEChqvPqXqIIfGIIVhIA=
Domainkey-signature: a=rsa-sha1; c=nofws; d=googlemail.com; s=gamma; h=message-id:date:from:to:subject:mime-version:content-type; b=EcXctOUjyqAXCGtlEslabMKWU/5Xrll+KZqiSWc/WQw+8eJ1lBxZ9nF+YvSuK/AFvBQyV5ikNygPdhQt2zZldvMXge6cj7URm8LkNRxKvfT/ZXPzHjv4BjoEuVBd3Mq3shhZ0nQ6U/zSrgzTuhFHIoHhrau9jqcrKUEHdHuhlXM=
Domainkey-status: good (testing)
Reply-to: [email protected]
Sender: [email protected]
I have for a long time used a Racal 1792 reciever for QRSS modes on LF.
This receiver failed recently,and I have been looking for a replacement receiver.
This search reveals a problem most modern receivers use DSP techniques
for filtering and the AGC is derived from the filtered signal. None of the receivers
I have looked at have an AGC OFF  facility.This means that if one of these receivers
is used with ARGO or similar FFT programs a strong signal within the pass band
will desensitise the Rx. It seems quite possible that a weak signal could quite
disapear. It also appears that some AGC is applied before the digital filter so that
signals within the roofing filters bandwith will also produce de-sensitisation, and this
could be as much as 15kHz away from the tune freq.
Any ideas on receivers not using DSP filtering ?
Or do I look for another R1792   

73 Laurie G3AQC
<Prev in Thread] Current Thread [Next in Thread>