I was looking at the VK9EC/VK9EX web site and see where they were able to erect
an L for top band and made two top band QSOs yesterday --- if the two were any
of youz guys/gals, good on ya!
72/73, Jim R. K9JWV
_
Topband Reflector
Jim,
The Mobility industry has been using pre-distortion. It has finally been
implemented in the Hermes and Apache Labs Transceivers by Warren C. Pratt.
He has won the ARRL Technical Innovation award and justly deserves it:
From
On 8/2/2014 9:06 AM, Michael St. Angelo wrote:
Jim,
The Mobility industry has been using pre-distortion. It has finally been
implemented in the Hermes and Apache Labs Transceivers by Warren C. Pratt.
He has won the ARRL Technical Innovation award and justly deserves it:
Interesting technique.
Yep.I think the YAKITT outfits are all suffering from the
'notinventedhere' syndrome.
There is plenty of it out thereespecially in offshore mfgrs.
73
David Harmon
K6XYZ
Sperry, OK
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Jim Brown
It really doesn't matter how much power the amplifier is outputting. A
simple explanation is that a sample of the output is inversely fed back and
combined with the input. As was mentioned before, this method has been
around for a long time. When you fly into an airport, the FAA radios that
Feedforward, pre distortion, and conventional FB have all been around a long
time in the analog world of amplifiers at audio and RF.
With digital it has become easier to implement the complex versions and is
pretty much standard well into the 100 GHz range and beyond.
The USN and USAF in
On 8/2/2014 4:06 PM, James Wolf wrote:
It really doesn't matter how much power the amplifier is outputting. A
simple explanation is that a sample of the output is inversely fed back and
combined with the input. As was mentioned before, this method has been
around for a long time. When you
I read the technical report on Pure Signal and it
sounds like what we used to call a hero experiment
in the research lab where I worked, consisting of a
few impressive results, but with many disclaimers,
and nothing you could productize. What is supposed
to be new is the adaptive part, but it
On 2014-08-02 17:46, Paul Christensen wrote:
Their implementation of adaptive pre-distortion (APD) works very well
even without well behaved amps and substantial IMD improvement is
easily attained with existing bipolar transistor, FET, and vacuum tube
amps. I have personally witnessed
Rick,
Is the report public? Do you have a link to it?
Jim - KR9U
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Richard
Karlquist
Sent: Saturday, August 02, 2014 9:17 PM
To: topband@contesting.com
Subject: Re: Topband: Rig Comparisons
On
On 8/2/2014 7:53 PM, James Wolf wrote:
Rick,
Is the report public? Do you have a link to it?
Jim - KR9U
This is the report I read; it was at the top
of the Google search results:
http://www.wavenode.com/PureSignal.pdf
Maybe I didn't read the right paper.
Like I said, this paper is
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