W7GJ, Lance wrote:
Unless I am totally missing the boat here (which certainly happens), it
seems to
me that the cleanest way to make the K3 flexible enough to replace
existing
equipment requiring external sequencers, would be to be able to adjust the
time
between K3 PTT keying and
Benson,
I've done some measurements some time ago with my K3 #1212 and i had the
following values:
K3 power set to 20W, f=7.040MHz 25W 50 Ohms dummy load
MCE/WeinschelLP-100A Wattmeter
mode USB 1 kHz sine audio at rear line-input, level adjusted to have
the desired ALC bar
Rudolf, the problem is not one associated with the accuracy of the K3
meter, but one of the ALC being fairly slack with the end result that
a fluctuating audio input from speech or from a sound card on many data
modes results in widely varying power, unfortunately often exceeding the
level set by
Thanks for this table. It appears we should be aiming for 2-3 bars not 6!
Ideally, everyone will have an accurate RF power meter in circuit.
If you know the PA current, which you can read accurately and the voltage
which can also be read, you can calculate your input power. All you then
need
Dave,
I followed the problem you described on the group and this is the reason
i do some measurements around the power output because i was a little
bit anxious!
At the beginning, my only 2 ham references were my MiniVNA output
(calibrated at my office at -2.04 dBm , 7.040MHz with 50 Ohms load)
hb9ari wrote:
Benson,
I've done some measurements some time ago with my K3 #1212 and i had the
following values:
K3 power set to 20W, f=7.040MHz 25W 50 Ohms dummy load
MCE/WeinschelLP-100A Wattmeter
mode USB 1 kHz sine audio at rear line-input, level adjusted to have
the
Further to what I wrote, I have just noted that the power output in DATA A
still varies though only by about 2dB across the passband even when the
audio input is increased to drive 4-5 bars of ALC.
In SSB mode, with the audio level adjusted to no more than 2 bars of ALC,
and CMP reduced to zero,
- Original Message -
From: Julian, G4ILO julian.g4...@gmail.com
I believe that when the K3 was released a year ago, the DATA A mode was
identical in behavior to SSB...
It was *very* flat, I haven't used my K3 for the last year other than to add
HRD support. I've been using my
I guess I'm missing the boat on this discussion.
I thought all high power VHF ops used an external sequencer board that
did the following type of thing.
RX to xmit:
1) Bypass the mast mounted preamp, wait a bit
2) Put the amp in the tx mode, wait a bit
3) Put the xvtr in the tx mode, wait a
Guys,
Out of the blue, the external keyer input to the K3 produces mushy dits
at higher speeds. It seems that each dit has a tail which reduces the
off time till the next. This happens in the TEST mode as well as with
RF output. It is most noticable above 25 wpm on S,H,5 characters. The
Clint,
I looked at the manual, and the K3 FSK input has an internal pullup
resistor, so none is required externally.
That is unless the logic signal you are using to drive the FSK input has
some unique requirements (like needing more saturation current than the
K3 pullup resistor provides. A
I'm confused. Which key jack are you plugging into?
- Keith N1AS -
- K3 711 -
-Original Message-
Out of the blue, the external keyer input to the K3 produces mushy dits
at higher speeds.
73 de Brian/K3KO
___
Elecraft mailing list
Post
I'd like to add a desktop microphone to my K3. I have left a Yaesu MD-1
from earlier times, and made a cable for the K3. It works, but the modulation
is rather low volume in comparison to the Heil HC-5 I use.
What about the Kenwood microphones, like the MC-60 or MC-80?
Are there any
KEY IN for external keyer (paddle connected to external keyer, keyer
output keying FET to key in) , PADDLE connected to paddle input for
internal keyer.
73 de Brian/K3KO
Darwin, Keith wrote:
I'm confused. Which key jack are you plugging into?
- Keith N1AS -
- K3 711 -
-Original
The K3 suggested ALC level for digital modes is *4* bars. The 6 bar
indication is for SSB (actually listed as 5-7 bars).
According to the K3 FAQ page - when the indication is at 5 bars, the DSP
ALC is just being tickled. For data modes, ALC action is not
desirable, thus the 4 bar
OK that's what I thought. I think about the KEY IN as the input for
bugs straight keys and was slightly confused by calling it the
external keyer input :-)
Do you have a bug you can try on that input?
- Keith N1AS -
- K3 711 -
-Original Message-
From: elecraft-boun...@mailman.qth.net
Don Wilhelm-4 wrote:
The K3 suggested ALC level for digital modes is *4* bars. The 6 bar
indication is for SSB (actually listed as 5-7 bars).
According to the K3 FAQ page - when the indication is at 5 bars, the DSP
ALC is just being tickled. For data modes, ALC action is not
Hi Keith,
Unfortunately no bug.
Now that you mention it, it kind of sounds like a bug when one holds the
dit side down for a long time. After a number of dots, each gets to
sound longer and longer and more slurred.
For what it is worth, the computer interface to KEY in uses an NPN
~
N2CQ QRP CALENDAR
JANUARY 16 - February 16, 2009
~
80 METER FOXHUNT (CW) *** QRP Contest ***
Each Tuesday to Mar 24
9 PM to 10:29 PM Eastern Time USA
Info:
Hi Werner:
The Yaesu MD-1 desk microphone works just fine on my K3 with excellent
transmit audio and plenty of it. So I would think that you need to make sure
that your setting on the K3 are correct for it. I have also used the Shure 444D
desk mic with very good transmit audio as well.
Brian,
At the KEY input to the K3, it is the low level voltage that is
important, not the high level. My guess is that your external keyer is
not going to a low enough level to fully discharge the .001 capacitor
that is on the key in line inside the K3.
Do your keyers have a resistor between
I just replaced the battery in my K2 yesterday. I am pretty sure that
the last time I replaced it was spring/summer of 2007 so I expected to
get more life from it.
When I removed the battery I discovered that the negative terminal and
crimp on connector were badly corroded. After removing the
In a recent message, Bob Boehmer bboeh...@gmail.com wrote ...
When I removed the battery I discovered that the negative terminal and
crimp on connector were badly corroded.
I assume that over time I cooked the battery and caused the leak.
So anybody who leaves their K2 battery float charging may
Hi,
I'm working on the assembly for S/N 5684. I don't appear to have the
SMT1A replacement board for U12, but I have the DIP MC1350.
Should I request a replacement part for this non-RoHS part, or just go
ahead and stuff this DIP?
I assume they perform the same function, but just wanted to make
To make this all simpler I normally run the transverter as the LAST box to be
sent to transmit (ensuring that RF switching is disabled!). So
Rig-sequencer-Tx relay-PA bias-transverter. This may hot switch the
transverter, but that's rarely a problem in reality with the low powers and
enables
John,
Either will work just fine, so unless your are overly concerned about
the lead contribution to the environment when you finally send your K2
to the landfill (not many ham radio items go there), just install the
DIP MC1350.
The SMT1A is actually a surface mount MC1350 mounted on a carrier
Andy Cook, G4PIQ wrote:
Now just need to find out why some of the Amphenol N-type relays used for
high power switching have got into a state that can take up to 0.5 second
to release after volts have gone. Maybe they've got magnetised - they were
originally 115V AC relays re-wound for
John Shadle wrote:
I'm working on the assembly for S/N 5684. I don't appear to have the
SMT1A replacement board for U12, but I have the DIP MC1350.
Should I request a replacement part for this non-RoHS part, or just go
ahead and stuff this DIP?
The DIP will work identically.
73,
Wayne
N6KR
Hello,
For Sale: KDSP2 filter for the K2. Excellent build by a technician with 35
years experience (me). 100% operational. No issues. Ready to plug and
play. $189
Please contact me directly (eyekazoo(at)gmail.com)
-Jerry w7anm
___
Elecraft
Go ahead and use the 1350.
73,
Eric WA6HHQ
_..._
-Original Message-
From: John Shadle sha...@katzenfisch.com
Date: Friday, Jan 16, 2009 8:18 am
Subject: [Elecraft] K2 U12 MC1350 or SMT1A
To: elecraft@mailman.qth.net
Hi,
I'm working on the assembly for S/N 5684. I don't appear to have
When you changed from ac to dc did you add an anti-stiction part to the
magnetic junction? If not, that's why it takes so long to separate. It' just
a copper or brass shim to keep the parts at a slight distance.
David
G3UNA
- Original Message -
From: ANDY COOK
To:
What about the Kenwood microphones, like the MC-60 or MC-80?
Werner,
I'm using a stock Kenwood MC-34S with good results.
Terry, W0FM
K3/100 #474
___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to
Dave - Thanks very much. Most helpful.
On 1/15/09, Dave Gilbert d...@ab7e.com wrote:
I've searched around for similar information and so far this is the best
I've found:
http://www.w1hkj.com/FldigiHelp/Modes/index.htm
It shows waterfall, spectrum, and audio samples of most of the common
At 06:20 PM 01/15/09, Eric Swartz - WA6HHQ, Elecraft wrote:
This is getting a little off topic. Lets end the thread now and take the
discussion off list to direct email.
An alternative for Off Topic posts and continuation of threads that
may not be appropriate here is located
at
Julian,
I did my test for output over a range of frequencies with 4-5
bars of ALC and as I stated, the power varied by about 2dB.
If ALC is being applied at the DSP that is just plain wrong
in my opinion, as it cannot compensate for the variations in
gain at different frequencies due
Lance,
This is the only proper way for serious VHF stations. Use your feedback
contact of the final RX/TX coaxial relay (which is most probably mounted in
the top of your tower) as a final go for the RF out of the K3 by using the
TX-Inhibit Line.
73's Evert PA2KW
Cu
-Original Message-
Joe Subich, W4TV-4 wrote:
the purpose of ALC is not to control the
shape of the passband across the SSB filter it is to prevent a
SSB signal in total from overdriving the power amplifiers.
I agree with you. As applied to a voice SSB signal or even a wideband data
mode that is
Hi Andy,
Yes, you are right - it is hard to imagine that it would take a whole
second to transfer all the relays. I just thought if there were a way
to provide more of a delay before enabling the RF output, it might as
well go up to a second so you could accommodate mechanical coaxial
John,
Your K3 auto tune optionwithin the K3 and the SB200 should take care of any amplifier input mismatches found on the turned circuits within the grounded grid amplifier. In more technical terms, the impedance range of the KAT3 should be adequate. Having a second tuner in between the K3 and
Hello Evert,
Yes, I think I may rig up something to use the K3 TX-Inhibit line when I
take my K3 on DXpedition to E51 in 2 months. Good idea! TNX and 73, Lance
Evert Bakker (PA2KW) wrote:
Lance,
This is the only proper way for serious VHF stations. Use your feedback
contact of the final
If the filter response varies across the passband, which it
does, the ALC will vary the amount of gain used to try to
keep the RF level to the amount it is set at, whether the
signal is being generated near the edge of the passband or at
the center.
This is your fundamental
How are K3s being shipped regarding the Band Data output? Are new radios
including the pull-up resistors, or are they still all being shipped with
open drains?
Phil - AD5X
___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a
On page: http://www.elecraft.com/K3/k3_app_notes.htm
Included on All K3s shipped on Dec 10, 2008 and later. (Rev B KIO3
Digital board)
73, doug
From: Phil Debbie Salas dpsa...@tx.rr.com
Date: Fri, 16 Jan 2009 13:06:17 -0600
How are K3s being shipped regarding the Band Data output?
Joe W4TV wrote:
Closed loop power controls are not appropriate to SSB systems because time
constants sufficient to maintain constant power across the
IF passband for digital operation would result in frequency
dependent clipping and/or compression in voice operation.
Most digimode programs
New K3s shipping now have the pull ups.
73, Eric WA6HHQ
Phil Debbie Salas wrote:
How are K3s being shipped regarding the Band Data output? Are new radios
including the pull-up resistors, or are they still all being shipped with
open drains?
Phil - AD5X
Do they also have the negative ALC included?
Jerry W4UK
At 19:53 1/16/2009, Eric Swartz - WA6HHQ, Elecraft wrote:
New K3s shipping now have the pull ups.
73, Eric WA6HHQ
Phil Debbie Salas wrote:
How are K3s being shipped regarding the Band Data output? Are new radios
including the
Hi Elecrafters,
How does one connect N1MM Logger to the K3 so you can execute a
pre-recorded memory in the DVR from Logger, and still have the normal
rig mic override the DVR when necessary?
Anyone care to share?
73,
John W9LHG
___
Elecraft mailing
Joe Subich, W4TV-4 wrote:
This is your fundamental misunderstanding of ALC. Traditional
ALC does NOT (and can not) increase gain - it can only DECREASE
gain to bring the grid/base/gate current down to the level at
which the final amplifier is not being overdriven. DSP based
ALC is
Ordered my K3 Dec, 29th. I was told an assembled unit would be another
week or so longer than a kit. That made sense, so I ordered the kit and
saved a few bucks. I'm glad I did.
I received the kit Jan. 14th. Built it the afternoon of the 14th and
morning of the 15th. It took about 8-9
Leigh L. Klotz Jr WA5ZNU wrote:
Most digimode programs include a tune button which outputs a tone at the
selected output; psk's idle is a simple two-tone. One option (and I
expressed this a year or so ago to the Elecraft folks) would be to offer
an IMD calibration at the IF level for a
Hi Bob and All,
I got home and did USB NCS duties tonite on MARS so I have a little more
information.
It seems that when I first start transmitting even at a MIC gain of 25, I
only initially get about 30 to 60 Watts of power out. If the Mic gain is 15
it is more like 35 Watts.
If I keep the Mic
HI all...
I am helping a neighbor assemble his K3. I have put a number of these
together now, but none with the DVR and/or subRX.
I think the DVR can go in with the initial build (comments)?
Do you suggest that the base K3 be completed first and then the
subRX be installed, or should I do it
One option (and I expressed this a year or so ago to the
Elecraft folks) would be to offer an IMD calibration at the
IF level for a known two-tone response, to determine whether
at least that stage is being overdriven.
Unfortunately, the PA will be overdrive far before the IF.
Doing
No, I do not misunderstand what ALC does. Perhaps I am just
not very good at explaining what I am trying to say. I
realize that ALC can only reduce the gain. That is why it is
necessary to set the audio drive level so that you get a
little bit of ALC across the whole passband range that
Two weeks ago I assembled my K3 ( serial 974 ) having waited until I received
both my KRX3 and KDVR3 since I didn't want to have to keep removing and
replacing the front panel to install each of them. I installed the KRX3
auxiliary DSP board on the main DSP board during the initial build as
55 matches
Mail list logo
