Hi, Mike,
I was fortunate enough to be at a meeting last month of the ham club where
Rick Campbell works up in the Portland area. I just happened to be on site
on the right day and got myself invited.
He was really entertaining. A very brilliant guy, and a real throwback to
the old days of ham radio when everybody built equipment and knew how things
worked. He interspersed his presentation (which was on primitive receiver
and transmitter circuits, in an effort to get the club members building
something) with some philosophical comments which revealed a lot of what he
values in ham radio.
One of the things he went off at length about was the fact that so many
radio amateurs have lost their "ears", in the sense of their ability to copy
weak signals. He lamented that most of us listen to radios that are cranked
up way too loud, and that AGC only tends to worsen the problem. The result,
according to him, is the loss of the skill of hearing below the noise floor,
or, in the worst case, actual hearing loss. I think he's onto something
there. In general, I think we listen at way too high volume to radios, TVs,
and other stuff. We pay for it later in life.
This topic came up when he set up one of his homebrew receivers and let
everybody listen for a little bit through his headphones. Somebody said,
"You need more volume there, Rick," and that prompted his comments. Whenever
he's tuning around, he said that he listens at phenomenally low volume
levels on purpose.
R,
Al W6LX
-----Original Message-----
From: Mike & Lara Pagel [mailto:pagel@wi-net.com]
Sent: Saturday, March 31, 2001 6:13 PM
To: wb5jnc@juno.com
Cc: tentec@contesting.com
Subject: RE: [TenTec] binaural CW?
Check out March 1999 QST, page 44-49. The article's title is: "A Binaural
I-Q Receiver" and it is written by Rick Campbell, KK7B.
It's also on the ARRL web site - for members:
http://www.arrl.org/members-only/tis/info/pdf/9903044.pdf
The article's title is: "A Binaural I-Q Receiver" and it is written by Rick
Campbell, KK7B
73, de Mike, K9UW
-----Original Message-----
From: owner-tentec@contesting.com [mailto:owner-tentec@contesting.com]On
Behalf Of wb5jnc@juno.com
Sent: Saturday, March 31, 2001 7:41 PM
To: csturner@falcon.csc.calpoly.edu; tentec@contesting.com
Subject: Re: [TenTec] binaural CW?
May be apples and oranges here, but it seems there was an article in one
of the ham mags (which one and when I don't recall) which featured a
"binaural" cw filter project. The unit took the audio out signal from the
rig and split it through a lowpass opamp filter on one side and a
highpass filter on the other, then into the separate channels of stereo
headphones. I never tried building one, but the net result was supposed
to be that lower pitch sigs would be heard in one ear and higher pitch in
the other -- i.e., a signal would in essence move across from one ear to
the other as you tuned up or down the band. As I remember it the idea was
to center the desired signal in the middle of your head and let your
"mental" CW filter do the work. (I hope this is at least somewhat clear
on how the unit was supposed to work -- perhaps someone else built one or
remembers when and where the article was published and can clarify or
verify what I remember.) 73, Al
On Sat, 31 Mar 2001 15:08:22 -0800 (PST) Clark Savage Turner
<csturner@falcon.csc.calpoly.edu> writes:
>
>Any of you guys use the JPS NIR-12 for binaural CW reception and how
>well
>does it approxmate diversity reception?
>
>I had a Yaesu FT 1000 here in the shack for a week once (a guy wanted
>to
>swap for my OMNI VI) and I used the dual receive with stereo
>headphones to
>really dig out CW signals. I am told the NIR-12 approximates this in
>its
>binaural mode and just wonder if anyone has experience with it.
>
>At a mere 47, I find my hearing is sometimes a problem, especially in
>the
>CW range. I am using lower tones these days, but find I need to
>change
>the tone frequently to reorient my concentration on the CW signals
>during
>QSO's.
>
>Clark
>WA3JPG
>
>
>--
>FAQ on WWW: http://www.contesting.com/FAQ/tentec
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>
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