RE: LF: Re: XDW on "Alien space invader mode"

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Subject:	RE: LF: Re: XDW on "Alien space invader mode"
From:	"Laurence KL1X" <[email protected]>
Date:	Tue, 19 Apr 2005 13:50:07 -0800
Delivery-date:	Tue, 19 Apr 2005 22:50:32 +0100
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In-reply-to:	<000401c544ea$07cae2a0$e21686d4@erica>
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Its interesting to see how Argo places a fast swept signal into various"bins".

You would have thought that the carrier density (If Im allowed to use thatword) spread time would produce a far more broken and diffuse pattern; inreality dependant on sweep speed it will cause Argo to brighten up variouslines but still produce enough visualisation to improve detection overall(?)The faster the sweep rate the more lines between sweep limits..

Dependant on fade or noise at that instance my general impression is that itdoes -and certainly as you say Peter aid to detection - but I think worms,sine, triangular and other blimps are better that just straight lines!

I cant get my synth to sweep 0.4Hz over 120 secs or longer at the moment butIll have a look at the DDS solution.


Laurence

From: "g3ldo" <[email protected]>
Reply-To: [email protected]
To: <[email protected]>
Subject: LF: Re: XDW on "Alien space invader mode"
Date: Tue, 19 Apr 2005 14:20:23 +0100



Hi Laurence

> XDW on 137.7752/137.7756 Khz DFCW dot 90  - Dash High
>
> Dot is being swept from 137.7752 to 137.7755 KHz and back at a rate of3
> sec per "cycle"
>

In the early days of QRSS I was using an analogue signal generator as a
driver. This was somehow frequency modulated so that the frequency variedupand down during key down. This had the effect of causing the dots anddashes
on the readout to look like worms - much ridiculed at the time but it made
for a very identifiable signal under marginal conditions.

Peter G3LDO

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