Kevin Rock-2 wrote:
Plus it is only a few chips on a board to get the job done. Firmware is
dead simple too. Simple solution, why hasn't anyone built it yet?
Kevin. KD5ONS
Quite like the solution you can get here I would say, notice the solution
showing a K2/K3 at the remote rig
John Cooper-10 wrote:
heres a link http://youtu.be/cJJ2WiN18oM
Nice work John!
But then how could I say anything but that - he was inspired by my page
here:
http://la3za.blogspot.com/2011/05/five-k2-leds-in-buttons.html
http://la3za.blogspot.com/2011/05/five-k2-leds-in-buttons.html
Terry Schieler wrote:
Can anyone point me to some sort of step-by-step pictorial for the 5 LED
K2
button mod?
Yes and no.
You should realize that the addition of these LEDs requires substantial
modifications to the K2 such as desoldering of parts, cutting of PCB traces,
and addition of
I would recommend DipTrace over Eagle. Although Eagle is used by almost
everyone, DipTrace is a much more modern program with a user interface which
looks much more familiar to most computer users. Therefore the learning
curve is much less steep for the occasional user.
It will draw circuit
You are referring to my web page on how to fit 5 LEDs to the K2s frontpanel
(http://www.qslnet.de/member/la3za/K2_LEDS.html)
In order to get a wire from the K160RX option to the LED on the front panel
I had to use pin 7 P1 on the RF board. It is used originally for the AUXBUS,
but since it is not
Judging from the volume on the list regarding the new KX3, Elecraft seems to
have as loyal a following as Apple - only a smaller customer base. Maybe
Elecraft has learnt from their neighbors?
-
Sverre, LA3ZA
K2 #2198, K3 #3391
LA3ZA Unofficial Guide to K2 modifications
--
View this message
Both of the additional LEDs that you propose are already indicated in the LCD
display: VFO Lock with a blinking decimal point and the KNB2's with its own
arrow. Thus the need isn't there in the same way as for the five that I have
fitted: Zerobeat, Split, AFIL on, TX, RX ant on
See
Be aware that class-D (digital) audio amplifiers like this, in combination
with long loudspeaker wires, don't always go so well with amateur radio.
Sometimes they radiate well into the lower short-wave range. Unless of
course, you turn off the stereo whenever you turn on the radio ...
Phil
I have built the Pluto semi-kit from Linkwitzlab and recommend it. It is an
active loudspeakers with an unconventional soundstage and design, look at
http://www.linkwitzlab.com/.
Sverre
LA3ZA
-Sverre, LA3ZA
K2 #2198, K3 #3391
LA3ZA Unofficial Guide to K2 modifications --
View this message
Now that there has just been a software update, I thought it would be a good
time to remind the good people at Elecraft about a bug that annoys those
with the K144XV internal 2 m option installed.
At our club station, LA2AB, we are not the only ones, it seems, that
experience that it is often
All the proposed changes to the 40 m bandpass were, as far as I can recall,
intended to decrease the bandwidth from 300 kHz to 200 or 100 kHz. These
modifications can be found here:
Elecraft's
http://www.elecraft.com/Apps/eu_40_meter_narrow_bandpass_filt.htm EU 40
Meter Narrow Bandpass Filter
Thanks for the tip Poul-Erik, I'll check for that! Probably both 80m and 160m
are possible.
I should expect something in the order of 250-300 ms at my 60 deg N
latitude.
For info on these long delayed echoes, see
http://en.wikipedia.org/wiki/Long_delayed_echo
-
Sverre, LA3ZA
K2 #2198,
This is exactly what I found useful during the CQ WW CW contest. I did some
500+ QSOs and found that it is easier to listen to the K3 with the
Attenuator on in the 20 m band. In this band this is something I rarely do
with the K2. This discussion on AGC threshold has perhaps told me the reason
I remember seeing a QST test of the internal K144XV, I believe it was in
August this year, where its large-signal handling specifications were
inferior to the external XV144. Please correct me if I am wrong on this, and
if not I would like to understand why.
-
Sverre, LA3ZA
K2 #2198, K3
We seem to experience what appears as a software anomaly when trying to
listen to 2m on the Main VFO and 6 m on the Sub.
Our club station has a K3 with a sub-rx, a K144XV interal 2 m option and an
extermal XV432. A 6 m antenna is connected to Ant2, and HF-antenna to Ant1.
The 2m option works
Nothing beats the Gamma Research Power supply when it comes to small size:
1.25 lbs - 0.57 kg. I use it with my K2 for travelling. It takes 100-250
VAC, 50-60 Hz
http://www.gammaresearch.net/hps-1a.html
-
Sverre, LA3ZA
K2 #2198, K3 #3391
http://www.qslnet.de/member/la3za/K2/mod.html
I am about to install the second receiver in the K3. I now have two
synthesizers, the old no 1 which has been made up to date with a paralleled
resistor (
http://www.elecraft.com/K3/mods/KSYN3%20DDS%20Gain%20Modification.pdf KSYN3
DDS Gain Modification ) and which does not have any shield. Then I
Thanks for comments - OK it's a stiffener, not a shield.
Looks like I should put the stiffened KSYN3 in the primary position then,
eliminating the possibility for transmitting a chirpy signal when monitoring
the transmission on the internal loudspeaker. With time I can perhaps
upgrade the second
One thing that I believe has not been mentioned in this thread is a very
simple solution to the hum problem. Since the K3 already has an audio power
amplifier, amplified speakers are not really needed. I had an old pair of
computer speakers - which hummed every time I transmitted on the K3. Then
If you are interested in adding LEDs to the K2 you may want to look at my
description on how to add up to 5 LEDs without drilling any holes in the K2,
see http://www.qslnet.de/member/la3za/K2_LEDS.html K2 LEDS . They are:
1. Split/RIT/XIT
2. Zero-beat detector
3. Analog audio filter
4. TX on
5.
Hi Lyle,
Thanks for your response. I take this to mean that with an internal 2 m
transverter it can listen to 2 m on rx A, while rx B listens simultaneously
through an external XV432 on 70 cm.
KK7P wrote:
4. IF the K3 has two receivers, can one listen on 2 m and the other on
70
cm?
I
We are considering a K3 for our clubstation where 2m and 70 cm is important.
Therefore I have some questions which I haven't been able to find answers to
by searching the lists.
1. Are the external (K144XV, 25 W) and internal (XV144, 10 W) 2m
transverters identical with respect to receiver
My shift control knob was also slipping initially when my K3 was new. It was
so bad that Elecraft sent me a replacement. But while waiting for the
shipment I noticed that pushing the control many times seemed to help. After
some pushes, I don't know how many, maybe 10-20, it was OK. Now I have
Perhaps your ATU which changes state?
Richard Thorpe wrote:
I hear a relay click when I tune across 14.200 down it clicks at
14.197 and up it clicks at 14.020 USB I don't remember hearing this
in the past. Is everything OK and what relay is clicking?
R Thorpe AC9D
If you have an oscilloscope you can connect it and see the output. I have a
K3 which has the modified IF with higher output. I have a 5 MHz (-3 dB)
oscilloscope in my shack for monitoring. Even at 8.215 MHz it indicates up
to +/- 50 mV in the 40 m band (no ATT, no PRE). In other bands it is
Chuck Guenther wrote:
Just a couple of days ago, I finished hooking the two together for
dual-receive ... This application was inspired by
G4AON's reflector message dated 7 Aug. 2008. It's the first time I've
ever tried dual receive and I'm having fun with it.
G4AON's dual receive
Concerning the last few days' discussion of noise and artifacts, here is a
spectral analysis plot of my K3's output:
http://www.qslnet.de/member/la3za/bilder/K3-CW-spectran.jpg
First it shows the signal related artifacts in the 10-13 kHz range as
mentioned by Wayne N6KR below. It also shows line
It appears that there are several sources for lines in the spectrum of the
output on the LINE OUT jack.
What I measured earlier today was at a LINE level of 015, at some value
above that one can see that indeed the harmonics of the signal spectrum
starts to appear -maybe due to some transformer
I have used these settings for the K1EL-keyer to emulate the K2:
Ratio 45, Weight 65, Sample 35. They work quite OK. They have been taken from
here:
http://www.mail-archive.com/elecraft@mailman.qth.net/msg46771.html
73
Sverre
LA3ZA
Unofficial Guide to K2 Modifications
Jens Petersen-2 wrote:
Trying to get HRD (v5 build 2356 beta) to connect to:
http://www.dxsummit.fi/DxSpots.aspx
I just use one of the local BBS'es (OZ5BBS-7) works fine.
I have also given up connecting to dxsummit.fi with HRD, but I miss the
filter there for 'CW only' spots, which
n0jrn wrote:
When installing the KPA100 in an EC2 enclosure, should I install the
speaker ???
The speaker of a KPA100 in an EC2 enclosure can be used for other rigs if
you make a simple modification, see instructions here:
http://www.qslnet.de/member/la3za/KPA100_loudspeaker.html K2:
M. Hendricks wrote:
K2 s/n 3464
With this serial number I would think the only major modification is the
Keying mod, see http://www.elecraft.com/order_form_parts.htm#K2 Parts
Your serial number is large enough that you just got the PLL compensation
mod, and the VCO shielding kit is
Audio is notorious for having a very subjective vocabulary, and this may make
it hard to understand what is meant. I hear terms like hissy, rounder, lack of
bass etc in this discussion. In an attempt to make this discussion more to the
point I would suggest this list compiled by Bruce Bartlett
I don't know about the Bose noise cancelling headphones, but with electronics
integrated such phones may pick up RFI. I had a pair of noise cancelling Aiwa
headphones, and they picked up a strong buzz whenever I was transmitting, so
the noise cancelling feature was useless in practice with
Pretty sure it's The Weird Stuff Out There.
I have a page dedicated to all kinds of weird stuff in terms of
propagation, see http://www.qslnet.de/member/la3za/prop/
The page has a collection of audio samples from unusual HF propagation
phenomena, from round-the-world propagation (delay 138
On 160 m and 80 m, one kind of weird delayed propagation is the ducted
one, where signals travel along magnetic field lines into space and
back, but it is very rare.
And on second thought, since Matt was hearing static crashes with delay
between his two receivers - one imaginative
It is interesting to see the responses to my statement on the difficulty
of machines copying CW better than humans. Although this is a little
off-topic here, I hope we can have a short discussion of it anyway.
First, the success of negative SNR communications methods such as
Olivia,JT65, and
Simon (HB9DRV) wrote:
...but the Morse code decoding needs some work.
I agree - I would love to have a month later this year to work on CW
decoding. I have no doubts that a computer can decode better than a human,
just needs someone (!) to write the decoder.
Oh, ye of great faith!
Just
I also read about some owners having to replace the headphone jack.
The headphone jack will go to the back and I will put a hefty 6 mm phone
plug in there. Plenty of space there, hi hi.
I wouldn't be so concerned with this. I have had my K2 for 6 years without any
problems with the headphone
Tnx Lyle,
I've seen that link before. It links to
http://www.ac6rm.net/mailarchive/html/elecraft-list/2003-10/msg00581.html
which is broken. Maybe I can browse the old archives 2003-10 from a
different archive.
73,
Steve N6VL
Steve,
Unfortunately many of the links on the LA3ZA K2 mods
My KPA100/KAT100 is located 5-6 meters away from the K2 and I am afraid I have
gotten RF into the VRFDET line and fried the output buffers on both of them.
The Power display on the K2 does not reach full value especially on 15, 12, 10
meters. In this setup I think it is the voltage from the
Thanks Don for the tips:
If you have the KAT2 installed, try changing its R6 value to 470 ohms as a
first step.
If the K60XV is installed, be certain that its VRFDET output is NOT being
enabled when the KAT100 is installed and the low power output is not being
used.
Check RF board D9 to
Thanks Don for the tips:
If you have the KAT2 installed, try changing its R6 value to 470 ohms as a
first step.
If the K60XV is installed, be certain that its VRFDET output is NOT being
enabled when the KAT100 is installed and the low power output is not being
used.
Check RF board D9 to
Unfortunately, my K3 NR and NB are poor second performers compared to one
standard, the SGC ADSP2. I've made my concerns to Lyle and Wayne and hope
improvement will be placed high on the to-do list using the ADSP2 as a
standard.
I think the difference in performance may be due to the use of
When a K2 stops working when the mic is connected, then this sounds as if the 5
Volt in the mic connector is being shorted.
This will take out several vital functions on the front panel/control boards. I
would check the mic's plug.
Sverre
LA3ZA
Here's a planetarium program for your Java mobile phone that also includes a
greyline program:
http://www.piecafe.co.uk/solun/jsolun.htm
Sverre
LA3ZA
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Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the
K6DBG wrote
Some of the time, my pulses just die at the output of R8, which goes to ground
via L1. I'm not sure exactly what I do differently when the pulse gets past -
perhaps just how hard I'm tapping?
Sounds strange, if you hear the noises coming through your K2 (with the NB
off), they
Benny Aumala wrote:
v6 SoftRock lite kit ...
If you will use it with K3, ask Tony to send 11 MHz Xtal with the kit.
Benny,
I don't quite understand the X-tal frequency of 11 MHz. My impression is
that the Softrock needs a crystal which is 4 x the center frequency, i.e. in
the order of 4 x
WB6QRN wrote:
And just to confuse things even more, what about the Tayloe mixer?
I don't know about the H-mode mixer, but the Tayloe mixer has been patented
by Motorola.
Product detector and method therefor was filed in 1998 and granted in 2001
as US patent 6,230,000. See
NZ0R wrote:
I'm using an Alinco DM-330MV switching power supply for my K2 with no
problems. It has a control that allows me to move the frequency of any RFI
I
encounter from the supply, but I've never heard any.
I have this supply also and use it daily. I can hear some noise in the 160 m
band,
W1UJR wrote:
I built and installed the Noise Blanker board for the K2 last night.
Even when not switched on, it seems to attenuate the signal by 1-2 S units.
I did not find this correct and went back and double-checked components and
windings on the cores, twice!
This is not correct, you should
My L1 82 mH inductor has a DC resistance of 62 ohms. This is quite
different
from the 180 ohm version used in the mod. Would a series resistor be
desired
as Fred indicates in the message below? I have 100 ohm, 120 ohm, and 150
ohm
resistors on hand. Where is this resistor installed between
I have the KBT2 battery mounting hardware for my K2, but so far no battery.
The Elecraft 2.9 AH gel-cel battery costs $30.00. Unless someone convinces
me, I don't see any point in transporting a battery across 9 time-zones,
when similar batteries seem to be available locally.
But that's the
Ben K1NT wrote
This week I was performing the power control mod (R98)
and noticed that I was only getting a maximum of 7.5w
at 28.8 MHz.
If you used to have full output on 10 meters and don't get it any longer
after having changed R98, what comes to my mind first is that you may have
I have often wished I could monitor the output of the IF of my K2.
You may find some past experience on the K2 Mods page (link below my
signature), go to 1. General Mods and then click Input/Output.
There is some advice from Eric - WA6HHQ /Elecraft on what to do and not to
do there as well as
I see that on the LA3ZA modification pages there are some capacitor
changes
that change the time constants in the KNB2. Unfortunately the links to the
mods themselves seem to be broken.
These links are to www.qsl.net which seems to be down for the moment. I try
to avoid links to qsl net on the
I've finished additional K2 receiver measurements and have posted them to
my web site,
www.cliftonlaboratories.com.
Very interesting results, in particular the AGC performance curve.
I wonder about the statement In an ideal receiver, once the threshold point
is passed, there will be little
second, if the RF gain control is turned or touched at all, the rig
immediately goes silent and all the bars in the bar-graph meter are
illuminated. Over a period of about three seconds the bars are
extinguished, from right to left, and the sound comes back up. The
control
itself works in
My K2's AF gain must be set at about 1-2 o'clock to be able to hear
anything.
Could your AGC be too agressive? What happens to AF gain as you turn AGC off
(Press AGC and PRE/ATT simultaneously). If gain increases considerably the
pot on the back of the control board needs some adjustment.
73
-Original Message-
The problem with the in-line volume control is that it will
reduce the desired signal also.
I believe that is exactly what is needed. The inline volume control will
affect both the sidetone level and the audio output just as the suggested
modification of the
I recently had a chance to implement the improved sidetone filter by TF3MA
(http://www.raunvis.hi.is/~matti/TF3MA/sidetone_tf3ma.html). This was
inspired by the experience of KT5X in November
(http://www.ac6rm.net/mailarchive/html/elecraft-list/2006-11/msg00456.html).
This mod really works
I think you may have hit the nail on the head. I DO have to reduce the
volume greatly when using the headphones. From my perusal of the schematic
for the K2, it looks like if I changed R36
There isn't really any need to modify resistor values in the K2 to achieve
what you want, unless you
-Original Message-
Can anyone recommend a way to test my new K2 noise blanker?
The simplest way to test the KNB2 is to rub a screwdriver across Q21 - the
RF Preamplifier- a metal case transistor which is visible when the K2 top is
removed. That will generate the kind of noise that
After having read the interesting thread about binaural CW and pseudo-stereo
I found these two descriptions of analog circuits that are fairly simple to
build. The most advanced one is by VE3VXO:
http://www.arsqrp.com/ars/pages/back_issues/2001_text/0501_text/street.html
. It has both phasing and
--
Date: Wed, 24 May 2006 00:13:12 +0300
From: Bekir Kemal Ataman [EMAIL PROTECTED]
Is it possible at all to work from a train in motion?
de TA2RX
-
Merhebe Bekir,
Yes, you can operate from a train, see LA5XOA's story from last year about
LA1TRAIN - LA9TRAIN
-Original Message-
There is a little trick to driving the K2 that might not be
obvious...
FR0;FA0001410;
...
Depending on application, issuing K20;AI0;
Hi Dave,
Thanks for sharing your experience. I have tried this now by defining a new
Elecraft setup in BeaconSee. It
-Original Message-
I wonder if the beep is a standard error message from the
K2 when it receives an incomprehensible command over the KIO2?
There's no beep in response to a garbled RS-232 command, Sverre. The K2
ignores incorrect
commands and quickly recovers to process the next
I am trying to run the BeaconSee program (http://sapp.telepac.pt/coaa/) with
my K2. I get the impression that this program is able to set the K2's
frequency and make it jump between the various NCDXF IARU HF beacons.
However, all I can get it to do is analyse the K2's audio input for a
manually
-Original Message-
No - approximate height of mine with feet is 3 3/8 plus a
tad - total about 3 7/16 allowing for the screw heads -
width almost exactly 8 (including screw heads)
This is 20.3 cm by 8.7 cm. There are something like 5500 K2s out there now,
so if you stack them
-Original Message-
I'm wondering what mods I should do now to avoid teardown / rework later?
Hi Keith,
I'm the one with the mods list on my web-page and I agree with W3FPR - Don.
You should not plan for any mods now.
If you eventually find that you want to modify the K2, it should
-Opprinnelig melding-
My K2/100 will be bullt for me in the near future, and I remember
seeing a post or two in the last month or so about providing a high
level audio output (not controlled by the VOL control) for data or
recording purposes. I coudn't find it in the archives
Here is a simple single resistor mod that may be helpful for some:
I am beginning to realize that I will never be able to exceed 20-25 wpm CW
speed. The speed pot of the K2 however covers from 9 - 50 wpm with 30 wpm in
the middle position. Thus the range which is useful to me is just a small
-Opprinnelig melding-
Today I fed an S9 CW signal into Spectrogram and find that
its third audio harmonic is down approximately 10 dB from the
fundamental. The 5th, 7th, 9th, are down about 4 db
sucessively from the next-lower odd harmonic.
Just a few questions to understand
-Opprinnelig melding-
An example of this is I turn the rig on and say it comes up
on 14.010. I tune up the band to 14.035 and turn it off. If
I turn it back on immediately, it come up back on 14.010!
Did you try to wait 30 seconds before you turn it off?
The manual says:
Hi,
As many already have responded, the K2 covers 7.0-7.3 MHz in its orignal
version.
What may be confusing is that there is a mod to narrow the 40 m filter down
to 7.0-7.1 MHz for the European range. Some of us who have done this mod may
consider removing it, and go back to the original K2 40
My question is.would I be-able to get more audio out of
pin 8 if I change the value of the 10k resistor in LA3ZA's mod ??
As W3FPR said, maybe, but in any case not by very much, and probably not by
enough to really make a difference.
You could fit the audio amplifier board on the
-Original Message-
The fan in the K2 is blowing into the box but there is no way
out (kind of short circuit in terms of air flow).
Hi, Evert
I wondered about the same when I built my KAP100, and here is an explanation
from the Elecraft reflector some years ago:
Subject:Re:
-Original Message-
Thank you, Don, for your technical description as to what
might be happening.
I have polished my straight key silver contacts and replaced
the diodes with 1N5821 Schottky diodes, but am still getting
the problem occasionally.
David
If you have many diodes
When the KPA100 power amplifier is external to the K2, the KPA100
loudspeaker is unused. I wanted to use it for other rigs that need a
loudspeaker. The minijack connection on the back of the KPA100 can be used
if its internal switch is shorted.
This can be done in a simple way by mounting a male
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Stewart Baker
Clever idea Sverre,
I hate to see components just sitting idle..
Thanks Stewart!
Actually, the loudspeaker in the KPA100 sounds better than the one built
into the K2 also - less
-Original Message-
My question concerns what pitch is easier to copy
when receiving fast cw when no qrm is present.
There has been research on the topic of sidetone and level. It concluded
with 500 Hz and in some cases even lower tones to be favorable in noise free
environments.
-Original Message-
Linguistics, so I asked him over my patty melt, Does Morse
code class as a language? He said, Hmmm, that's something
I've never thought about. Probably not. I would put Morse
code in the class of phonetic alphabets,
Very good point which I was about to
-Original Message-
KNB2 Rev C dtd 3 Feb 2000
KAT2, Rev B, dtd Feb 14, 2000
KSB2, Rev B, dtd Nov 15, 199
but are there any upgrades to the un built modules?
KSB2:
I am aware of the ALC upgrade mod for the KSB2 dated Sept 2001, see
http://www.qslnet.de/member/la3za/K2/mod.html and go
Thanks for the replies to my earlier post - can someone
confirm that when cycling through SSbC from 1-1 to 4-1 what
the states of the three compressor pins COMP0/COMP1/COMP2 are please?
They start all high for SSBC 1-1, then COMP2 goes low, then COMP2 + COMP1,
until all three are low for
-Original Message-
Can someone remind me what we're supposed to use instead of
WWV for VFO calibration in EU?
RWM from Moscow on 9996/14996 kHz is an alternative, see
http://www.irkutsk.com/radio/tis.htm and scroll to bottom of page.
73
Sverre
LA3ZA
http://www.qslnet.de/la3za/
-Original Message-
If you really can't hear them on a different receiver, check
the bias voltage on the t/r switch. It should be between 90
and 150v. Low voltage here can cause this problem. The t/r
switch is used whether or not the KPA100 is activated.
--
Another test you
-Original Message-
Now I have had my K2 for some 2 years I have still not had a
single QSO with another K2 ... anyone interested in giving me a call?
OZ6ABM
Hi Robin,
I don't think I have ever had a QSO with a K2 in Denmark. I'll be happy to
have a QSO with you any time. It's not
-Original Message-
I am interested in determining which earphone (or speaker)
would have the highest physical movement. I am deaf and
intend to read morse by feeling the vibration.
It occurred to me that the vibrator which is found in most cellular phones
these days may be
-Original Message-
I ran a square loop with 65' sides, up 20 feet, fed at a
corner, through EZNEC. The antenna would be a good NVIS
antenna on 80 and 40 meters, with maximum radiation straight
up on 80 and at 55 degrees on 40. It would be good for QSOs
up to a couple of hundred
-Original Message-
Is there a way to test the KNB2? Anything that can be
measured? Do I need a different noise-source?
A simple test that costs nothing in terms of test equipment is to scratch
Q21 with a screwdriver, see
-Original Message-
The W0MHS Loop Skywire is a great antenna, but feed it with
some ladder line.
I should add that this is exactly how I feed mine. About 8 meters of ladder
line (450 ohms I believe), into an Elecraft 4:1 balun and then to the
KAT2/KAT100. The ladder line is
-Original Message-
I need to order a set of headphones. They'll be used on my K2 for CW
primarily.
Apart from comfort in wearing, and how desirable it is that the headphones
supress external noise, the sensitivity is the main issue with the K2.
The K2 has relatively low output
-Original Message-
If your K2 is suffering from this issue, the solution is to
modify the KSB2 module. Unfortunately, I can't find the
details offhand.
I think it must be this link that applies:
http://www.ac6rm.net/mailarchive/html/elecraft-list/2004-08/msg00887.html
The
-Original Message-
The preferred method of padding the BFO capacitors is to
maintain the ratio between C173 and C174 by paralleling them
with capacitors. A single capacitor from the junction to
ground will be in parallel with the series combination of
C173 and the varactor D38
-Original Message-
My RIT control got quite squirrely after a while, and I replaced it. Now
it's fine. The new pot I got from Elecraft seemed more substantial (the
shaft appears to wobble less) and they may be using better pots now than in
my K2 no. 709.
--
These comments, and my own
Didn't DK3RED do something similar some time ago?
Take a look at
http://www.ac6rm.net/mailarchive/html/elecraft-list/2002-06/msg00829.html.
He used instead the on-off switch of the K2 with its DPDT function to bypass
the in-line diode for charging of the internal battery when the K2 is turned
-Original Message-
I want to remove the KPA100 from my K2 and install it in the KAT100-2
enclosure. Since I will NOT be using any type of computer control, is it
still necessary to install a KIO2 in the K2 and beef up the handling
capacity of the RF choke?
--
I am running my
-Original Message-
I have pictures of mine on my web site at
http://www.qslnet.de/member/la3za/K2_LEDS.html
---
The schematics of how the LEDs in the buttons for the SPLIT, zero-beat
indicator and KAF2 indicator are wired can now be downloaded from the page
above, see about
-Original Message-
For a 'no-holes' implementation, a small LED can be mounted in a keycap.
Don W3FPR
I have pictures of mine on my web site at
http://www.qslnet.de/member/la3za/K2_LEDS.html
Since the Split LED output from the K2 only can drive a low current LED it
takes
I have read the postings on the problem of having to set the AF gain as
bands are changed with FSK and PSK31 modes, and I seem to recall that I have
seen a product that automates this.
I believe it was a hardware device that monitored the PSK31 output and
adjusted the AF level for optimum
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