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> |
---|---|---|
|
Previous by Date: | Re: LF: test, Mike WE0H |
---|---|
Next by Date: | LF: MF/LF, mal |
Previous by Thread: | LF: VE1ZZ, mal |
Next by Thread: | Re: LF: LF Receiver, Andy Talbot |
Indexes: | [Date] [Thread] [Top] [All Lists] |