Brian . . .
Point taken, but we'll see. Miniaturization comes at a price. No one
ever replaced panel-mounted phone jacks as frequently as we do
circuit-board mounted miniatures today. Nor did we replace mic cords
and plugs (same with telephones) as often as we have to today.
My overall
I thought readers (especially those now building their K2's) might be
interested in my review of the Rework Eliminators now found at the eHam
website, under Product Reviews, QRP Accessories.
73 Happy Holidays to all,
Chuck NI0C
K2 s/n 5853
___
I had a similar problem, yesterday.
I just built K2/100 #5884 and everything was ok until I started
alignment of the KPA100. After a few minutes of getting normal output at
5 watts, I suddenly started getting 'High Current', intermittently on 7
MHz, then on every band.
Dropped back to
K2 #4958 with:
- KPA100 100-watt section
- KNB2 noise blanker
- KAF2 clock and CW filter
- original QRP top section
- power cord - manuals
- misc spare parts, tools (RF probe etc.)
Covers 10 through 80 meters. Built, tested, looks and works perfect. Original
owner/builder. High quality,
Hello all,
I notice that on K2 #03547 rev B (with KPA100, KDSP2, KSB2,
K160RX and thermistor installed at time of build) the master
frequency drifts as a function of temperature. From an
ambient temp of 65F to max rig temp when the KPA100 fan
kicks in the receiver may drift by 800 Hz. The
You don't mention what you mean by master frequency nor how you measured
the drift, but I believe you've misunderstood the purpose of the 4MHz
oscillator. It is used to program the lookup tables for frequency
generation, but during normal operation it's exact frequency does not
matter.
So, you
Adam,
I assume you are referring to drift of the 4 MHz master oscillator and not
to a drift in the PLL reference oscillator.
Drift in the 4 MHz reference is of little to no consequence in normal
operation of the K2. It is only important at the time CAL PLL and CAL FIL
are performed.
The K2
Merry Christmas to my fellow Elecrafters, and may 2007 bring lots of
joy, good kit building, DX, portable operation or whatever else you
enjoy in this wonderful hobby.
73,
Larry N8LP, Janet, Alan and Mike KD8DKT.
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Hi again,
As a few people pointed out, I misspoke in my earlier email.
When I calibrate C22 I immediately run CAL PLL and CAL FIL.
True, the K2 does not directly reference C22 during normal
operation. My calibration of C22 and then CAL PLL and CAL
FIL is all by-the-book.
That being said, I
Adam,
You cite 70 to 80 Hz drift from a cold start. That is within the K2 spec of
100 Hz drift typical from a cold start at 25C (77F). If your ambient
temperature is lower, you can expect more warm-up drift.
Once warmed up, the drift should be small.
Even my stable HP6840 takes about 2 hours
Glad to hear you're going to be back tonight. I'll be listening on 20m,
if I can get my Realistic DX-160 tuned properly. In a few weeks, I'll
be able to try to check in, depending on what part of the band that
frequency is in.
Kevin Rock wrote:
Good Evening,
After a week's hiatus I will
Earlier this morning Chuck (NI0C) wrote:
... readers ... might be interested in my review ... at the eHam website ...
--
This is *must reading* for those of you who find a new K2 under the tree in
the morning! The direct URL is http://www.eham.net/reviews/detail/6372
If you have used our
For the 20 meter frequency at 14050 all you need is a General Class license.
There are no Novice or Tech+ allocations on 20 meters.
For the 7045 kHz 40 meter frequency all you need is a Tech+, Novice or
greater license.
Ron AC7AC
-Original Message-
Glad to hear you're going to be back
Adam,
The K2 PLL Ref Upgrade manual gives some information on typical drift i.e.
5 to 20 Hz per 15 degrees F on 20 meters. It also explains how changing RA
on the thermistor board can better compensate for the drift. Since your
drift is consistent, I think you should be able to reduce it by
Kevin,
The RA resistor on the thermistor board is intended to compensate for drift
AFTER warmup - such as drift that might occur due to the additional heating
when the KPA100 is transmitting. I do not believe it would be fruitful to
attempt to compensate for the initial warmup drift that one may
I don't really see, or notice, any drift in my K2. I'm sure it does
a bit, but it must be a small amount, and negligible for my purposes
Stan Rife
W5EWA
Houston, TX
K2 S/N 4216
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Don Wilhelm
Sent:
Thanks to Colin, N0YGY for this idea. I fabricated mine from a coat hanger in
about 10 minutes and it works very nicely. Makes the K-1 nicer to use,
controls more accessible. And, the price was certainly right.
73, Curt KB5JO
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Elecraft mailing
To all my friends on all the lists...
A very Merry Christmas and Happy New Year to you and yours.
73, MRI XMAS ES HNY DE Jim, N2EY
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Don,
I agree about warm up drift. Perhaps I misunderstood Adam, but I
thought that his problem was that even during normal usage he found
objectionable drift when he operated his KPA100 for a while. I presume,
perhaps wrongly, that this is most likely coming from the PLL since I
thought that the
Merry Christmas and a Happy New Year to all..
Paul Gates, KD3JF
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From Wales (UK);
Nadolig Llawen a Blwyddyn Newydd Da (Merry Christmas a happy new year)
73
Roger MW0IDX K3IDX K2#2724 KX1 #416
http://mw0idx.co.uk
http://sota.org.uk
So how many different languages are represented
On Sunday 24 December 2006 15:26, Don Wilhelm wrote:
Kevin,
The RA resistor on the thermistor board is intended to compensate for drift
AFTER warmup
In 1978 I bought an Eddystone EA12 from Tom, G3YTO,
sadly SK in 1985. It used to keep my bedroom/shack
warm - thermal stability, and the glow
From our house to yours:
Larry, Marianne, Joseph and Cara wish you a very Merry Christmas!
May the Lord keep you and hold you close in His heart.
73 de Larry W2LJ
--
Larry W2LJ
QRP - When you care to send the very least!
http://www.w2lj.qrpradio.com
http://w2lj.blogspot.com/
Good Evening,
Well that was a tough one. One minute the signals were up and then
they were gone. A few very persistent folks got through on 40 meters.
The band was plagued with QSB which was very deep. Twenty meters was good
if you lived west of me. Tom, N0SS, was good before the
For those interested in evaluating their K2's drift without access to test
equipment, here's a process created by John Grebenkemper, KI6WX, while
testing the original PLL active frequency compensation mods back in 2003.
This procedure will identify the drift in the PLL reference oscillator
The K2 drift mentioned by Adam is about 5 ppm for 10 MHz WWV. This isn't
bad for a non-TCXO oscillator. With TCXO oscillators, you can probably get
down to 1 ppm, but it might cost you $50 extra. You can do even better by
mounting the oscillator in an oven (OCXO), but it will cost you a
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