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| To: | rsgb <[email protected]> |
|---|---|
| Subject: | LF: LF Receiver |
| From: | "lawrence mayhead" <[email protected]> |
| Date: | Fri, 11 Jan 2008 18:45:19 +0000 |
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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 |
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