Changing bandwidth from 200 Hz to 100 Hz should change the power bandwidth
by 3 dB. A signal centered and totally contained within the bandwidth
should not change in level thus yielding a S/N improvement of 3 dB.
10LOG(200/100) =3.0
73
Bob, K4TAX
----- Original Message -----
From: "Martin AA6E" <martin.ewing@gmail.com>
To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Sent: Monday, December 26, 2005 1:28 PM
Subject: Re: [TenTec] Initial comments about ORION II
> If you're listening to white noise only, you'd expect the audio power
> to be proportional to bandwidth (assuming flat audio response and no
> AGC). If you're listening to a CW note in the passband, the audio
> from the signal should not change.
>
> This does not automatically improve S/N, because your ear is pretty
> good at rejecting the noise background on its own. Effectively, you
> provide a filter of a few x 100 Hz in your little grey cells. It may
> be actually harder to copy CW at the narrowest bandwidths because your
> ear can't discriminate so well, especially when you have pulses like
> lightning crashes. (My pet theory)
>
> 73 Martin AA6E
>
> On 12/26/05, Robert & Linda McGraw K4TAX <RMcGraw@blomand.net> wrote:
>> As I understand, when the bandwidth is reduce by 1/2 then shouldn't the
>> total audio output be reduced by 6 dB? And thus S/N be improved by an
>> equal
>> amount?
>>
>> 73
>> Bob, K4TAX
>>
>>
>> ----- Original Message -----
>> From: "Steve Baron - KB3MM" <SteveBaron@StarLinX.com>
>> To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
>> Sent: Monday, December 26, 2005 10:09 AM
>> Subject: Re: [TenTec] Initial comments about ORION II
>>
>>
>> > Isn't that normal ?
>> > ----- Original Message -----
>> > From: "Toby Pennington" <toby423@earthlink.net>
>> > To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
>> > Sent: Saturday, December 24, 2005 19:56
>> > Subject: Re: [TenTec] Initial comments about ORION II
>> >
>> >
>> >>
>> >> Ron, Do you notice any loss of signal audio when turning the BW
>> >> encoder
>> >> from 200hz to 100hz in the cw mode? Not the signal strength but
>> >> the
>> >> audio itself. I seemed to notice loss of audio the last time I
>> >> operated
>> > the
>> >> O2.
>> >>
>> >> ----- Original Message -----
>> >> From: "Ron" <ron@morell.us>
>> >> To: <tentec@contesting.com>
>> >> Sent: Friday, December 23, 2005 6:06 PM
>> >> Subject: [TenTec] Initial comments about ORION II
>> >>
>> >>
>> >> > My ORION II arrived yesterday and 15 seconds later it was out of the
>> >> > box
>> >> and
>> >> > on the air. I tried it out for several hours yesterday and set it
>> >> > up
>> >> > in
>> >> all
>> >> > the configurations that caused problems with the ORION. It did not
>> >> develop
>> >> > any anomalies that I could detect. As I currently operate this
>> >> > radio,
>> > it
>> >> is
>> >> > flawless. I've operated binaural CW with sweep on at the different
>> >> levels,
>> >> > I've operated CW and PSK, while listening to AM broadcast radio on
>> >> receiver
>> >> > B with the sweep on, and a variety of other settings that have
>> >> > caused
>> > the
>> >> > ORION running the latest version 1.3 software to either stop
>> > transmitting,
>> >> > or stop receiving on Receiver B.
>> >> >
>> >> > It is a little disappointing, that I'm not yet challenged with
>> >> > software
>> >> > anomalies whilst operating the O2. Maybe someone would enlighten me
>> >> > and
>> >> > tell me what parameters are needed to create a fault in this version
>> >> > of
>> >> > software? Perhaps if I read the manual, and consider the
>> >> > instruction
>> >> there,
>> >> > I'll find a way to create a fault.
>> >> >
>> >> > I really like this radio and wish all on the reflector and all the
>> >> > folks
>> >> at
>> >> > Ten Tec a Merry Christmas and a happy New Year! And thanks for
>> >> > building
>> >> > this great radio.
>> >> > 73
>> >> > Ron KA7U
>> >> >
>> >> > _______________________________________________
>> >> > TenTec mailing list
>> >> > TenTec@contesting.com
>> >> > http://lists.contesting.com/mailman/listinfo/tentec
>> >>
>> >> _______________________________________________
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>> >>
>> >
>> >
>> > _______________________________________________
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>> >
>>
>>
>> _______________________________________________
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>
>
> --
> martin.ewing@gmail.com
> http://blog.aa6e.net
> _______________________________________________
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