[Lowfer] 136 Dial freq for OP-OPDS 32 for tonight...,

[jrusgrove at comcast.net]

>However, a second setup using an eprobe near ground level but away from the house and deep-search 
>opera32 decoded >DK7FC 5 times between 0444Z and 0704Z.

At MF, LF and VLF almost any antenna will gather enough signal ... the biggest s/n improvements come 
via noise reduction. This can be difficult to determine when looking for signals -50 dB SNRr since 
weak noise sources can't be heard in the headphones. Luckily it can be seen on narrow FFT 
spectrograms and SpectrumLab, in particular, is able to accurately measure and plot the noise floor 
and guide one to 'under the audible noise floor' s/n improvements.

Jay W1VD  WD2XNS  WE2XGR/2  WG2XRS/2




----- Original Message ----- 
From: "Garry Hess" <k3siw at sbcglobal.net>
To: "lowfer list" <lowfer at mailman.qth.net>
Sent: Wednesday, December 18, 2013 7:50 AM
Subject: Re: [Lowfer] 136 Dial freq for OP-OPDS 32 for tonight...,


>A busy night on 136 kHz with WE2XEB, WD2XES, VO1NA, and DK7FC sending opera32. Didn't do very well 
>with a loop and regular opera32 - snrs were rather low - but deep-search opera on the same machine 
>detected all 4 (DK7FC only once). However, a second setup using an eprobe near ground level but 
>away from the house and deep-search opera32 decoded DK7FC 5 times between 0444Z and 0704Z. The Spec 
>Lab spectral peaks looked good too but as noted previously the snrs are generally low compared to 
>regular opera. Best snr for DK7FC was -43.4 dB; best for VO1NA was -39.1 dB.
> -- 
> 73, Garry, K3SIW, EN52ta, Elgin, IL
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