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

[Douglas D. Williams]

What is "deep search" Opera? Is that a separate piece of software? Does it
work with "regular" Op32 transmissions?

-Doug


On Wed, Dec 18, 2013 at 8:21 AM, <jrusgrove at comcast.net> wrote:

> 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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