Owen,
Go through the transmit alignment for the bandpass filters before
declaring another problem.
Most K2s will have some power reduction on 12 and 10 meters, but if your
10 meter power output is greater than 10 watts it is OK.
73,
Don W3FPR
On 10/6/2010 10:16 PM, Owen B. Mehegan wrote:
> W
The latest errata has a picture! You know -- something about a thousand
words...Hi!
It will be on the web site soon. My apologies for not having it in time to
save you the work Owen.
73,
Ron AC7AC
-Original Message-
Owen,
I will have to take some of the blame about the wording in th
Well that did it! I verified that I put C6 in the wrong two holes,
corrected it, and now I'm getting good power out on 40m! Thanks Don!
I'm still seeing only .3-.4 watts on 12m and 10m, but I realize I'm
getting ahead of myself. Should I just proceed through the alignment
until I get to 12m
I have (and have always had) mine set to 20 also. Didn't help, in this
instance.
I often turn the AGC off when running JT65A on 20m using the JT65-HF
software, so that a strong signal somewhere in the 2 kHz passband doesn't
trigger the AGC and wipe out a weak -25 dB signal I'm trying to decode.
On 10/6/2010 5:15 PM, Scott Ellington wrote:
> There does indeed seem to be something funny about the 400 Hz filter.
There are several issues. First, every 8-pole CW filter I've measured
has significant offset, and needs to be compensated, just like the
5-pole filters. 100 Hz is typical.
Sec
Thanks to all for the suggestions. There does indeed seem to be something
funny about the 400 Hz filter.
73,
Scott K9MA
On Sep 25, 2010, at 11:17 AM, SCOTT D ELLINGTON wrote:
> I'm just setting up a new K3 (4657), and the 400 Hz 8-pole CW filter
> (KFL3A-400) seems to have a significant o
Owen,
I will have to take some of the blame about the wording in the manual
errata sheet. I had though specifying the outer holes of the set of
three was sufficient - but I was apparently thinking only of a "set" in
mathematical language terms (I am certain any mathematician would select
th
Bill,
Look at your K3 manual page 53. and note the menu item AF LIM. After
seeing the posts on the amp failure, I immediate set this to limit the
AF output to safe levels as I frequently operate without the AGC being
ON (digital modes). I have mine set to 20, just arbitrary, half way
Ah, so you did, Don. My mistake for not taking heed, I would have
pressed on with the signal tracing. However, while sitting here at work
and pondering the problem, I just re-read your message below for the 3rd
or 4th time, and something clicked: AHA! I _did_ put C6 in the wrong
holes!! When I real
We have now released revision 1.02 of the K144XV firmware. As I
mentioned in an earlier posting, this version turns off the K144XV's
microprocessor clock in receive mode. In our lab tests, and based on
customer reports, this eliminates many if not all of the audible
spurious signals heard o
> Except for the lady folks who seem to START in that range. What
> happens in so many female voices I hear (including broadcast stations)
> is that high central tonality dominates to the point of overwhelming
> the silibant range and 600-1200 NEEDS to be seriously suppressed to
> let the si
I used to use an MFJ-4125 switching supply, which I believe is the
same circuit as the 4225 only sans the meters. I quit using it mostly
due to the fan noise (despite trying various circuits to reduce fan
noise none that I tried worked acceptably on this unit). But while
using it I detected no
The noise is never high, about 5 db over the morning noise. It occurs in
narrow spurs every approx 50 KHz. These move slightly as the output voltage
is adjusted.
It is possible that MFJ devices are refined over time. Mine is ca 1999.
Ignacy
On Wed, Oct 6, 2010 at 3:19 PM, Nick-WA5BDU [via Elecr
My results were while using 00.36 P3 software
Dave
Date: Tue, 05 Oct 2010 21:45:59 -0700
From: Alan Bloom
Subject: Re: [Elecraft] P3 for EME
To: "elecr...@g4fre.com"
Cc: elecraft@mailman.qth.net
Message-ID: <1286340359.1669.144.ca...@ulinux-desktop>
Content-Type: text/plain; charset="UTF-8"
Hi
I was surprised to hear of the MFJ-4225 generating noise on 160, since
I use a MFJ-4225MV and work 160 a fair amount, yet hadn't noticed any
noise. OTOH, I could I tell if I'm hearing P/S generated noise as
opposed to "other" 160 meter band noise?
I dug out my homebrew linear supply and deci
Go to the Elecraft mail archives and search for the thread "K3
speaker amp - sub side inop."
It's a tricky part to replace, but it's $5 if you do it yourself,
vs. about $140 (shipping, parts, labor) if Elecraft does it.
Another option is to just leave it dead, which I think I will do
next time
Oh, yes, the vaunted CBS Labs/Thomson CSF Volumax/Audimax
twins! Bob Orban and Frank Foti made a career tweaking
those things. My club has a TV Station Veteran Audimax
(left channel unit) handling the audio from the computer on
a repeater EchoLink VoIP circuit. Not too Ham Friendly, no
blinking
Unintentionally powering-off the K3 has happened to me many times and I am just
lucky, I guess, that I've seen no problems with a quick response power-on.
This almost begs that powering-off the K3 be changed to a long hold as opposed
to instantaneous. Indeed, it could be a long hold for both po
Ha!
That's another reason for the bigger foam windscreen, Guy,
its more absorbent! :)
-lu-
- Original Message Follows -
From: Guy Olinger K2AV
To: lrom...@ij.net
Cc: elecraft@mailman.qth.net
Subject: Re: [Elecraft] SSB transmit audio - Where's the
punch?
Date: Wed, 6 Oct 2010 11:45:38
I recently fried (I believe) the speaker amplifier in my K3, apparently by
just turning off the radio and turning it back on too quickly. Perhaps the
fact that the AGC was disabled at the time might have had something to do
with this, though that is just a guess. I accidentally turned off the K3
Does he have the wrong antenna selected on 17M? The K3 remembers
antenna selection on a per-band basis.
73, Eric WA6HHQ
www.elecraft.com
On 10/6/2010 10:14 AM, Ci Jones wrote:
> I am helping a friend build his K3/100. When doing the transmit gain
> calibration, everything calibrates o
I'd like to scan SSB segments of a particular ham band with TAP SCAN so that
the rcvr stays muted until it hears a signal, particularly when working on
shack projects and I'm not to close to the rig. The K3 will stop on an SSB
signal but the transmssion isn't intelligible 'cause the freq it stops
Owen,
I tried to caution you not to get excited about RF voltage values that
were higher than the listed expected values.
That is normal for a K2 that is not detecting any output - the K2
increases the drive in an effort to obtain more output. Since you have
no output, the RF voltages on the
I am helping a friend build his K3/100. When doing the transmit gain
calibration, everything calibrates on five watts, but on fifty watts, all bands
calibrate except for 17 meters. It appears the SWR is high to the radio on this
band and the wattage output will not settle (the verbiage used by t
Time to end this thread as we are now hitting the point of diminishing
returns ;-)
73, Eric
Elecraft List modulator
---
On 10/6/2010 8:45 AM, Guy Olinger K2AV wrote:
> On Tue, Oct 5, 2010 at 10:36 PM, Luis V. Romero wrote:
>> Of course, you are right, but I'm walking a fine line between disto
Hi Don -
OK, I have gone through the transmit signal tracing steps and found a
couple of anomalies. I'm referencing the specific section name and
step number in the troubleshooting here.
ALC:
3. Pin 2 of U8 (on the control board) shows 4.97VDC instead of the
expected .7 - 2.5VDC. The manual
On Tue, Oct 5, 2010 at 10:36 PM, Luis V. Romero wrote:
> Jim:
> Of course, you are right, but I'm walking a fine line between distortion and
> punch. I find the fatter foam windscreen from an Audio Technica Pro8HEx mic
> helps me place the CM-500 capsule at just the right distance from my mouth
On Tue, Oct 5, 2010 at 3:43 PM, Joe Subich, W4TV wrote:
>
snip... For flatter mics (like the new HC-6
> or a CM-500) use more high frequency boost (between +6. +10, +12 dB
> and +9, +16, +16 dB) to provide clarity. Since the human voice has
> little energy in the 600 - 1200 Hz band,
Except
Which is further acknowledged by the fact that singers seldom record while
sitting down. More diaphragm punch when standing (especially after lunch!)
Terry, W0FM
-Original Message-
From: Toby Deinhardt [mailto:dj7...@muenchen-mail.de]
Sent: Tuesday, October 05, 2010 1:31 PM
To: elecra
In response to many questions about what I chose, the answer is I
bought two different supplies, with different intended uses.
One was the Gamma Research unit, nice and small, but low capacity (okay
on SSB and CW, too low for digital modes unless you run 10 watts or so
due to its power duty c
Good information on the Symmetra-Peak and phase rotation/scrambling
can be found here: http://www.w3am.com/8poleapf.html and a discussion
of AM symmetry with info on the "all pass filter" (phase rotation)
here: http://www.tonnesoftware.com/appnotes/allpass/allpass.html.
I suspect the rotation wou
Silvio,
Yes, I would first replace CB U6 and Q3 and Q4, then see how the K2 behaves.
With such a strong static discharge, it is difficult to predict what has
been damaged, so take it one step at a time until the problems have been
resolved.
The DOT-PTT signal also goes the the firmware chip o
I tried two other adapters and they create no visible noise. The shield in
KUSB is all enclosed so hard to see whether it is attached or not. KUSB was
immune to QRO while the other adapters were not.
Regarding USB hubs, the ones I tried were not immune to QRO and they did not
work after coming b
Years ago in a land far far away we discontinued using the Semetra-Peak
(sp??) on AM in favor of the then new CBS Labs audio processers (
Audimax/Volumax (sp??)) which did a much better job of increasing the
average modulation with far fewer artifacts.
We did retain the boom mic phase reversal s
Hi I'm Silvio IZ5DIY,
while I was running a qrp long-wire setup by a little tuner, I touched
my K2 and experienced a "electrostatic" discharge.
A storm was coming and a lot of static energy was on air. I had cut -
yes had to cut - external wire antenna, I was unable to remove antenna
connector fro
For each voice, polarity only needs to be set once for each mic source. For
crystal, ceramic, and dynamic mics, that can usually be accomplished by
inverting the polarity at the mic element. Most folks who take AM polarity
seriously are also using some other intermediate audio processing devic
This (multiband compression) is essentially what digital hearing aids
do. In their case, the aim is to get the dynamic range into the gap
between the threshold of hearing and threshold of pain, both of which
tend to converge towards each other in hearing loss.
One figure of merit for such aids
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