[Lowfer] Spectran question

[William E. Isakson]

Bill, unless you are copying by ear, you do not need to use the radio's
filters when you use Spectran.  In fact, the filters cause a small drop in
the signal, so there is an advantage to not using them.  In Spectran, and I
have only used these types of programs for QRSS, the advantage is that the
computer shows all the frequencies. The filters just cut down the width of
the frequencies seen and so noise on frequencies away from the sought
signal.  In QRSS you can see signals and cw on the waterfall that you
cannot hear.  In QRQ spectran has no real advantage over the ear because it
can only show where the signal is and not what the cw is.   I guess if you
use it to locate the signal frequency and tell you that it is there, that
would be a slight advantage, but if you cannot hear it you cannot copy it
in QRQ.  Probably I was wrong about the 3500 hz, but computers do "hear"
better above 1500 hz than they do down around 700 hz.  That is part of why
you normally would use the higher frequency in a psk31 program.
Bill

--------


Bill Isakson     AC6QV
Roseburg, Oregon USA
bill.isakson at gmail.com

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On Fri, Apr 4, 2014 at 12:57 PM, Bill Cromwell <wrcromwell at gmail.com> wrote:

> On 04/04/2014 01:05 PM, John Bruce McCreath wrote:
>
>> With Spectran setup selected to the preset NDB mode (0 to 7400 Hz.) As
>> soon as I press
>> the start button, a red vertical line appears in the upper spectrum
>> display at 3500 Hz.
>> What is it and is there any way to turn it of?  Thanks in advance for any
>> replies.
>>
>> 73, J.B., VE3EAR
>>
>> LowFER Beacon "EAR"
>> 188.830 kHz. QRSS30
>> EN93dr
>>
>>
>>  Hi John,
>
> I do not have an immediate answer but I can tell you that the couple of
> times I tried the NDB setting I did NOT have such a red line. When I get
> out the toys later this evening and into the weekend I will intentionally
> use the NDB AND try to find something that will give me  stripe at 3500.
>
> I use Spectran with very narrow filter settings and I copy CW by ear - not
> on screen as with QRSS (which "NDB" seems to be, only faster) nor with any
> of the printing decoders. I turn on the CW peaking and put that in the
> middle of the filter - at 500 Hz. I then tune my radio to bring signals
> that I can see into the filter and right on top of the CW peak 'pip'. That
> pip is red. I wonder if that's what you see.
>
> *MY* computer is not hard of hearing at 500, 400, 300 - but my audio
> channel rolls off below that. My computer displays a pip at exactly 120 Hz
> from power line hum - which I cannot hear due to said rolloff. Obviously
> the PC and soundcard can "hear" it. Your computer may be different.
>
> John - you might give me a phone call later and we can both fire up
> spectran to compare notes on the phone. I'm in the Eastern time zone and I
> expect a very late supper tonight around 9 PM. We could do that earlier if
> you are available. Or just wait and I'll email you some screen shots from
> MY spectran screens and we can exchange email with attachments.
>
> 73,
>
> Bill  KU8H
>
> 989-534-1409
>
>
>
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