I replaced that diode in my K3 with instructions from an Elecraft
technican-person. I also at the point purchased bandpass filters so that I
didn't have to worry about that happening again.
In fact, all repairs and some mods to my first and early K3 were done by me
with Elecraft assistance
ll out or just plain cockpit
error after
operating sleep deprived? W0MU has a good point, if
you're operating away
from home like many of us do it could be a nice feature.
John KK9A (WP2AA next week)
WILLIE BABER said:
Tue Feb 21 20:43:05 EST 2017
I replaced that diode in
Now that I am totally doing so2r K3, I have reasons to use the second antenna
port available for k3/K3s. I understand from the K3s manual that the second
port works off the internal tuner module. If I understand correctly, you can
bypass the tuner and then select either of the two antenna
I have worn out vacuum relays in qsk amps too (replaced only one time in my 12
year-old Alpha 99). In fact, qsk with vacuum relays is not really qsk in that
a vacuum relay is not as fast and silent as what I experienced using Alpha 89,
which had switching diodes in it. Alpha 89 to me is the
What do you want to do with the radio?...for contesting K3/K3s is as good as it
gets, so far. And how was this done? By improving an already good radio. I
think it is most cool to be able to bring k3 up to K3s performance for about
$420 (synthesizer and preamp boards) and not buy a k3s.
K3s
Well, I didn't mention who it was that made the comment about what we now can
call the k3zo method. However, the guy who sees an advantage in a 3 khz
roofing filter can do just that!!
73, wj9b
CWops #1085
CWA Advisor levels II and III
http://cwops.org/
Hello All,
I have been reading the mail of this reflector for some time, and thought I
would join today and include my two cents; after all I own so2r K3/P3/K-Pod.
However, I do enjoy other radios, mainly an IC 7600 which isn't a K-3 in
handling strong signals but it does just fine here is
Hello All,
I did M/M with a big station in the NW running Icom 7700. Needless to say
comparison between K3 (one was on site) versus Icom radios came into discussion
during rest periods. Yes, the Icom 7700 played quite well, giving what some
called "full-body" cw and easy to pick-out-stations
I'd just like to know how an ADC works and produces some measurable form of
dynamic range that I can associate with what I do know and learned about
dynamic range. I got started with Solid State Design for the Radio Amateur,
published in 1977, where I learned about the concept of roofing
Hello Don,
You may never know how many folks you have helped-out who are K2 owners. As I
mentioned in an earlier post, I didn't finish my K2/100 until very recently,
serial number 0086.four years after I retired! So, as you know, I had to
do lots of mods. I think I got them all.
Your
It wasn't my term. But I think "full-bodied" cw means a slightly wider I-F to
establish background noise that some ops want to hear, particularly if the
receiver has exceptional gain distribution and in-band IMD, which the latest
Icoms do have. This gives articulation to cw signal outs of a
I like the size and weight of K3 also. K3 fits right underneath the seat in
front of you as a carry on, and K3 is as good or better than an Orion or
FT-5000 that will not fit in there, hi! What other contest radio can do this?
Elecraft K2/100. Yes, you can build it with the separate
My 2014 purchased K3 is 20-25 watts low on 14mhz but all other bands are good.
just haven't worried about it as I normally use 50 watts or less to drive
an amplifier. I'll look into it after ARRL DX CW in February, so long as it
doesn't get worse.
73, Will, wj9b
CWops #1085
CWA Advisor
I imagine that many persons wanting K3/K3s have one, and so sales may not be as
robust as a result. The many improvements over time have created a mature
radio--and all essential improvements can be made to an early K3 (same with the
K2). I appreciate Elecraft for this approach to building
Maybe there are two levels of frustrationregular frustration, especially if
you have ONE radio that isn't working, and you know that you will be off the
air until the radio is fixedand you will miss an operating event! This is
normal.
The second level of frustration is getting the
My experience is similar to Stefan's. In so2r I typically used k3 as the S and
P radio (but only after getting the the DSP board swap change). I used Orion as
the run radio (and before that, Omni VI).
Other than on-the-air experience with radio equipment (my own as well as at
ny4a M/M), the
More then one so2r operator has noted that the 7300 will overload in an so2r
situation so that you cannot clearly hear on 7300 when the other radio is
transmitting (yes, on a different band). Since the 7610 doesn't have a
front-end either, I imagine that it will do the same. Sherwood himself
Robert is talking about the crystal filters, also known as roofing filters
now-days, that are typically placed after the first mixer (I mistakenly typed
"ahead" but I meant "after" as Robert notes), though there is a post amp and NB
before these filters in K2 and K3.
The idea is that a
https://pdfs.semanticscholar.org/eb33/5c12858779a653d9b9b93ca20120aebb7616.pdf
Wes N7WS
On 6/13/2018 11:38 AM, WILLIE BABER
wrote:
> Robert is talking about the
crystal filters, also known as roofing filters now-days,
that are typically placed after the first mixer (I
mistakenly typed "ahea
LO phase noise, but
newer synthesizer designs overcome that obstacle.
Another thing to note is that IMD in crystal
filters is reported to be inversely
proportional to BW. So a wider filter might
actually be better from that
perspective.
Some Elecraft filters exhibit passive IMD BTW.
I've
often wondered if any other communication system requires
the close
in dynamic range we do. Why
would anyone design a system that allowed
signals 2 kHz apart to differ in strength by
140 dB?
73,
Scott K9MA
On 6/14/2018
20:33, WILLIE BABER wrote:
> Wes,
>
>
Stop Dave. Will you stop Dave? What do you think you are doing, Dave?
--
73, Will, wj9b
CWops #1085
CWA Advisor levels II and III
http://cwops.org/
On Fri, 6/1/18, rich hurd WC3T wrote:
Subject: Re: [Elecraft] [KX3]
While running stations on 160m at a high rate, the finals of an Omni VI got so
hot that output dropped to zero. Once the finals cooled for maybe about five
minutes, full output returned. We then put a small fan on the heat sink fins
and experienced no further problem. No damage at all to the
I have a Lunar-LInk System 72 (432 mhz) Amplifier using a pair of 3cx800
(perfectly designed by K1FO SK), in a cubic package that may actually be
smaller than the KPA1500 (of course the power supply is external, and the
blower and T/R relays are attached to the back of the amp). I had a choice
I imagine that if enough heat can be removed fast enough KPA1500 would run
key-down forever at 1500 watts output. That is why fan levels 4 and 5 are so
loud, to give those five minutes on (and take five minutes off) without the
amplifier overheating and forcing a hard fault. Hard faults force
How is it possible to compare the dynamic range of a direct conversion radio
with a superhet, where a mode-specific filter can be placed at the first mixer,
with the expectation that direct conversion would give similar dynamic range as
a superhet?
I haven't heard yet a technical way to
I guess Elecraft suspended the production of its 432 transverter kt...I went
looking to possible purchase one, and it is not listed. Any information as to
whether it will be produced again?
73, Will, wj9b
CWops #1085
CWA Advisor levels II and III
http://cwops.org/
K4 should succeed in that it appears to build upon K3/P3/KRX3 (highly
successful) with added color screen, direct-sampling SDR, and increased I/O.
The same K3 "upgradeable approach" applies to K4. If you are not into
contesting then K4 SDR may be all you wish (especially if you already have a
In my experience the value of high-level blocking and low phase noise is in the
ability to hear very weak signals next to strong ones. When I first got into
So2r years ago, I discovered an entire layer of very weak signals when I
switched to usingTenTec Omni V and Omni VI; this was related
I said that, to a person who reported that my radio was generating clicks. "I
am using K3, I should be perfectly clean," was my reply.
My K2 was clicky. I used it Qrp or LP until after I installed the Elecraft
modification.
Moreover, after curing Omni 6 and ft1000mp of clicks by installing and
Hello All,
I operated in the Classic Exchange event, and on Tuesday evening on 80 meters I
was surprised by a call from Wayne, n6kr. Wayne was using the K4 (I think he
was working, hi). Interestingly, I was using a Sierra qrp transceiver that I
built and that Wayne designed many years ago
K7? Does that imply that Elecraft company makes it to heaven too, with some of
us? Ok! But are there any 100 foot towers in heaven?
73, Will, wj9b, dit dit
CWops #1085
CWA Advisor levels II and III
http://cwops.org/
On Thursday, January 16, 2020, 5:28:53 AM PST, Dr. William J. Schmidt
I recall the K2 in particular. I received modifications from Elecraft before I
finished building it. Because I was working so hard at the University, I put K2
is a box, partially assembled. However, I kept track of every Elecraft
modification and put them in the box too. Then I purchased an
1 hz? My hallicrafters crystal controlled oscillator was rated less than 400
hz an hour drift after warm- up (it will do much better than that after 1 hour
of warmup), That was considered very stable in 1962. I still use it in short
qsos where I barely hear 10 hz of drift in 5 minutes, after
There is a way to improve the signal to noise of the CW signal. It is called
the yagi or beam antenna.
The tower, guy system, beam, feedline, connectors, and switching, all have
considerable appeal for some of us, the same as a good paddle, or a K3 radio.
My four towers and yagis were built by
I think the point of the recording was to illustrate receiver recover between
elements while sending high speed cw.
I would like to know how much better is k4 than k3, which would mean hearing
more between elements of cw at high speed; a better recording is needed or one
has to operate the
I received kpa500k yesterday evening, about 4:30 pm. I was done building it at
about 1:30 am, with time out for supper. I did the HV test before going to bed.
...very easy build; however, I was already familiar with the hardware sizes
which could otherwise slow down assembly.
I like the small
I had a problem with no output, but the radio was keying. I reseated all
cables going to the synthesizer, and rf output returned.
73, Will, wj9b
CWops #1085
CWA Advisor levels II and III
http://cwops.org/
On Monday, June 15, 2020, 01:04:50 AM PDT, G4BVH
wrote:
Hi,
I have had a
No disclosure required, Bob. Credit where credit is due (to Elecraft); just
based on the k3 alone, I believe you, hi.
The only reason I would not purchase k4 is because of k3/k3s. One of mine is
12 years old updated and performs just like k3s. I have three of them for so2r
plus in band so2r
I like k2 audio too but it seems that some of the difference compared to k3 is
the lower I-F gain in k2. So I reduced I-F gain in k3.
K2 audio still wins but nothing I have used here slices through cw pileups like
k3, or hears a weak signal better.
The main action I took to enjoy k3 audio was
nonetheless, I think we are all hoping for the best with covid (and doing
what we can to be safe) and vis-a-vis Elecraft.
If anyone thinks that Elecraft is trying to do anything other than their love
of art, and make a living doing it, then whomever thinks that hasn't been
paying attention
If I had the money to put up in advance I would "front" the money to Elecraft,
based on the K3. And I did purchased kpa1500 in advance.
I purchased Orion before it was produced based on most of the previous Tentec
radio too.
But I confess that while I do turn 70 years old in September, I am in
Can you say or know about when k4 will be available from " in stock" units?
73, Will, wj9b
CWops #1085
CWA Advisor levels II and III
http://cwops.org/
On Wednesday, January 27, 2021, 10:57:36 AM PST, Wayne Burdick
wrote:
> On Jan 27, 2021, at 10:04 AM, Wayne Suite wrote:
>
> Does
I used a kx1, operating FD with emergency power (batteries internal to kx1). I
used two sets of batteries.
The maximum output was 1.5 watts but after 2.5 hours of operating power output
dropped to .5 watts. So, I used another set of fresh batteries to operate a
total of 5.5 hours. I made 70
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