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Reply-To: <rondec at easystreet.com>
From: "Ron D'Eau Claire" <rondec at easystreet.com>
To: "'Elecraft Reflector'" <elecraft at mailman.qth.net>
Subject: RE: [Elecraft] K2 Optical Encoder stiffness.
Date: Fri, 6 Sep 2002 10:52:28 -0700

The optical encoder on mine stiffened up over time during the first
several months of use. I discovered that tiny threads from the felt
washer were getting caught in the bearing. I was able to remove most of
them, using a magnifier and a pair of tweezers to pull each one out
while 'unwrapping' as much of each thread as possible by turning the
shaft. That got the stiffness down to just about what I wanted, so I
left the washer off for the next few months. Over time, the bearing
loosened up more until I needed the friction again. So I cut the center
hole in the washer a little larger, then I put a thin ring of glue
around the inside edge to bind any loose threads together. Once the glue
dried I replaced the washer and all has been fine since.

Ron AC7AC
K2 # 1289

...The optical encoder on K2 #2681 has always seemed a little stiff to
me -...The tightness remains even when I remove the encoder's mounting
hardware, so does appear to be in the encoder itself rather than a
fixing problem. Anybody else had this problem? &, if so, did it clear
with time?... 73 de Mike, zl1mh.

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From: "Bob - AG5Q" <AG5Q at attbi.com>
To: <elecraft at mailman.qth.net>
Date: Sat, 9 Nov 2002 08:50:00 -0600
Subject: [Elecraft] Re: [Elecraft]PLL reference literature

Hi Roy,

Here are some links to interesting info from Motorola:

Details on the PLL chip used in the K2:
"PLL Frequency Synthesizer with Serial Interface"
http://e-www.motorola.com/brdata/PDFDB/docs/MC145170-2.pdf

Basic mathematical principles of  PLLs:
"PLL Design Fundamentals"
http://e-www.motorola.com/brdata/PDFDB/docs/AN535.pdf

"The MC145170 in Basic HF and VHF Oscillators"
http://e-www.motorola.com/brdata/PDFDB/docs/AN1207.pdf

73,

Bob - AG5Q


----- Original Message -----
From: "Roy Vickers" <rvickers at HobbsBondedFibers.com>
To: <elecraft at mailman.qth.net>
Sent: Friday, November 08, 2002 10:46 AM
Subject: [Elecraft] Wish list


> As I build my K2 I find that I want to learn more about the circuits I'm
> building. I have a fair electronics background but not familiar with
> circuits like the PLL. Can anyone suggest a book on more in depth theory
or
> perhaps one of you more knowledgeable hams with some time on your hands
> could write up the theory behind some of the circuits, including what the
> function of each component is. I read the theory section in my manual but
> it's very broad in nature. Perhaps Elecraft could publish an in depth
theory
> manual for an additional cost. Just wishes, very happy with my K2, now
> aligning the receiver and having a ball.
> Thanks
> Roy Vickers (KF5YU)

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