John,Re: "Anytime I change the mode from LSB or USB on any band to CW it
starts to send a “dit” without stopping..."Take a look at the plug and jack.
Be sure there is no damage to the jack, and that none of the plug was left
behind in the jack. That happened to me once on a keyboard. A part
Hi Chris,
Instead of spending time troubleshooting I would start with re-soldering
the Front Panel Board and connections. There are not that many
components so it shouldn't take that long. I had an intermittent
problem on my K1 and re-soldered the whole RF Board. Not very
sophisticated but it
My 40 and 20 meter K1 has developed intermittent frequency instability and
sometimes complete loss of ability to tune (frequency display jumps and stays
on 68.0 nominal on 40 and 63.0 nominal on 20). Lightly “mechanically agitating”
the circuit board just behind the front panel will bring it
Hi Kjeld,
I'm using the internal K144XV in one my K3s. It's very sensitive and
stable (using the REFLOCK board, too), so no problem on that. BUT: the
cooling design is just terrible! :-( It's all passive relying on the
side plate of the transceiver to dissipate the heat. While this works
I have a plain K3 that I bypass the built-in tuner on 80 all the time.
On 20 and 40 it is in-line all the time.
de Frank KG9H
> On Jul 5, 2019, at 4:42 PM, Jack Brindle via Elecraft
> wrote:
>
> Good observation, George. The KAT3A indeed does have a bypass relay, while
> the KAT3 (in the
Good observation, George. The KAT3A indeed does have a bypass relay, while the
KAT3 (in the original K3) does not. As I recall, the KAT3 switches the
inductors and capacitors out in bypass mode, but does not necessarily provide
the best 50 match. This is due to variances in the components and
Thank you, Wayne.
Sent from my iPhone
...nr4c. bill
> On Jul 5, 2019, at 12:59 PM, Wayne Burdick wrote:
>
> Nr4c wrote:
>
>
>>> How many ports does a K4D have without the ATU.
>
> 1 main antenna jack and 2 receive antenna inputs.
>
>
>>>
>>> I know the K4 only has one I think the ATU
The exact cable Wunder suggested is still available at Amazon for $4.95.
They can probably thank him for some sales! I bought one.
73,
Mark
W7MLG
On Fri, Jul 5, 2019 at 1:11 PM Don Wilhelm wrote:
> Note carefully that Wunder specified a "SPLITTER" and that is different
> than an 'adapter'.
>
On Fri, Jul 5, 2019 at 12:54 PM Jack Brindle via Elecraft <
elecraft@mailman.qth.net> wrote:
> As commonly used, bandpass filters have one main use - to protect
> receivers. That may be the local receiver, protecting it from sting out of
> band signals, or a neighbor receiver, gain protecting it
Note carefully that Wunder specified a "SPLITTER" and that is different
than an 'adapter'.
The more common mono to stereo adapter will NOT cure the condition.
73,
Don W3FPR
On 7/5/2019 3:28 PM, Walter Underwood wrote:
The mic plug is shorting the “mic button” (PTT) contact. Set MIC BTN to
I think we have the maximum power transfer theorem fallacy again here.
The maximum power transfer theorem does not give the right result when
you want to maximise efficiency, which is what you generally want to do
in a transmitter, as it always results in worse than 50% efficiency.
One would
-Original Message-
From: Jack Brindle via Elecraft
...
Now having said this, the ATU can also be bypassed in the K3, and that circuit
may provide a proper 50 ohm source/load for the BPF. I would probably take this
approach myself (and in fact do so in my station). The reason I take
As commonly used, bandpass filters have one main use - to protect receivers.
That may be the local receiver, protecting it from sting out of band signals,
or a neighbor receiver, gain protecting it from strong out of band signals.
This quite well describes SO2R stations, where we are very
Actually, I suspect that they're designed for 50 ohms at least in part,
because that's how they will be measured! We try hard to present a
matched load in the passband, but, as others observed, output stages are
usually lower than 50 ohms and few antennas, even when matched by a
tuner, look
Wes is quite right.
There is a free program called AppCAD that allows system noise figure analysis
for up to 7 cascaded stages. It is enlightening and you will understand the
significance of each stage in no time just by plugging a few numbers in. Have a
try its educational
73
Conrad PA5Y
In the last few weeks I have been setting up my K3S with transverters and using
the on board 2 tone generator and a 28 MHz transverter drive I have been
delighted with the TX performance. The 3rd order TX IMD at the level I require
is -58dBc! It is how radios should be. Tonight I am making
The mic plug is shorting the “mic button” (PTT) contact. Set MIC BTN to OFF in
the menus or use an off the shelf stereo to mono splitter.
I described the latter in this blog post. The splitter also gives you cleaner
mic bias and a PTT jack.
On 2019-07-05 1:55 PM, Jack Brindle via Elecraft wrote:
The external ATU takes care of the antenna matching, and should
> present a 50 ohm load to the BPF.
This only hold true for the *single frequency* on which the external
antenna tuner is "tuned". Typically (depending on the tuner Q and
A bit off topic, but I thought I’d ask anyway. Would using a HA1YA 6 meter
transverter with the K3S improve performance on noise level reduction and
sensitivity over the stock K3S?
73,
John
WA1EAZ
> On Jul 5, 2019, at 3:17 PM, Conrad PA5Y wrote:
>
> Hello Ed, the HA1YA and DB6NT
I bought the Heil headphone set up with my KX3 but have never been able to get
the mic to work right. I followed the instructions for installing it and the
menu items needed but every time I plug in the mic plug the radio immediately
goes into transmit mode.
The reason I wanted the headset was
Hello Ed, the HA1YA and DB6NT transverters are also considerably better than
the DEMI designs which are 3 generations behind. I have been in serious pursuit
of low PN and low IMD on 144 and 432 and I found that either of the
aforementioned transverters with a K3S were many times better than
A bandpass filter is designed for optimum rejection and pass frequencies
only when operated at 50 ohms. Thus both ends of the filter need to see
50 ohms. If the antenna has a SWR issue, no matter how small, it is not
likely 50 ohms. And if one uses the transceiver internal ATU to the
input
One reason to use the internal ATU with an external tuner is so the
transmitter can see a low SWR over a range of frequencies, without
retuning the external filter. Also, if the external tuner can only get
down to, say 2:1, the internal ATU will get it down to 1:1, and the
transmitter will be
On 7/5/2019 12:55, Jack Brindle via Elecraft wrote:
OK, so let’s look at the K3 side. The K3 antenna port connects directly to the
BPF’s radio port. Again, we are presuming the BPF is designed for 50 ohms
resistive source/load. The K3 is designed to transmit into a 50 ohm load, but
it may not
Thanks to all who replied to my mail (see below) but allow me to ask:
Anyone using Elecraft XV144 or K144XV or HG 144-K for digital modes?
Any comments on these being better or worse than other brands?
Vy 73 de OZ1CCM, Kjeld
-Original Message-
From: elecraft-boun...@mailman.qth.net
Now it's my turn to mope. I ordered my AX1 without noticing that it won't
ship until sometime after the 20th. Shame on me for not checking the
web site first.
--
72,
Rich Hurd / WC3T / DMR: 3142737
Northampton County RACES, EPA-ARRL Public Information Officer for Scouting
Latitude:
I stand corrected.
I made an assumption, probably incorrectly, that the reason they had a
second tuner was that the first did not successfully tune the antenna. They
just decided to put the bandpass filter between the two tuners, which would
have provided a mismatch at both the filter input and
Good points, some of which I considered making in my last post. Regarding the
SWR measurement capabilities of the K3 (or many other devices) I wrote about
this too in another thread:
http://elecraft.365791.n2.nabble.com/K3-SWR-Numerical-Indication-td7643839.html
Wes N7WS
On 7/5/2019 10:37
I think you misread the situation. The question isn't whether to put a
single antenna tuner between the antenna and filter versus putting it
between the rig and the filter. The question is whether putting an
ADDITIONAL tuner (the one internal to the K3) at the input of the filter
is a good
Lets step back a bit and look at the system here. The K3, with ATU, drives into
the BPF, when then drives into the external ATU and finally the antenna.
The external ATU takes care of the antenna matching, and should present a 50
ohm load to the BPF. The BPF, because of its design, should
You're offering a scenario different from the original. As I read it,
originally a tuner was used to flatten the load that terminates the BPF output.
Your analysis assumes a matched driver and a mismatch on the output of the BPF.
Then the OP mentioned a second tuner between the TX output and
It's not just a power issue. A filter only achieves its design goals if
the impedance feeding it and the load impedance it sees are as
expected. Most filters are going to want to be fed by 50 ohms and see a
load of 50 ohms. Most rigs (not sure about the K3) don't actually
present a pure
I could not let this go. I've done a lot of work with bandpass filters. The
mismatch will degrade the filter.
For an example, I used Elsie, which is a filter calculator. Using the
example 20 Meter bandpass filter, the passband loss is about .25 dB with
matched 50 ohms in and out. Changing the
Nr4c wrote:
>> How many ports does a K4D have without the ATU.
1 main antenna jack and 2 receive antenna inputs.
>>
>> I know the K4 only has one I think the ATU ads 2 more for total of three.
Yes. Also, any one of the ATU antenna jacks can be designated as a third
receive antenna input
> From: Nr4c
> Date: July 4, 2019 at 11:03:45 PM EDT
> To: n...@elecraft.com
> Subject: K4/K4D antenna ports.
>
> Wayne.
>
> How many ports does a K4D have without the ATU.
>
> I know the K4 only has one I think the ATU ads 2 more for total of three.
>
> But K4D must have two ports for
Our first commercial 11 metre dish earth station built in 1984 had a
4GHz 60dB gain, 33 Kelvin, electrically cooled two stage parametric LNA
at the feed horn. the cable to the receive system was LDF4-50 with 20dB
loss to a six port passive splitter.
The LNAs despite being pressurised
Kjeld,
I agree with Conrad PA5Y, both Kuhne Engineering or HA1YA make very
good transverters and are available in EU.
I would add the DEMI L-series transverter which now is made by a
company called Q5 (located in US) for any NA hams reading the mail on
this topic.
I use DEMI transverters
I haven't been following this thread closely, but it sounds like what
has been going on with my K3X with KXPA100 and internal ATU on FT8.
Transmitting with 100w, the relays click rapidly while the power meter
on the KXPA100 jumps up and down. Seems to be trying to find a match
that's not
Rich,
Yes and no. With 2 antenna tuners in-line, there will be a bit more
loss due to inductor winding resistance, but other than that, it should
do harm.
Several bandpass filters indicate that they should be between the rig
and the tuner (so the bandpass filters are not run at a high
To minimize emails direct replies would be nice. I searched the web and
could not find an answer. I know there are a ton of smart folks on
this list so I thought I would ask.
On Field Day at typical setup is :
K3 (or any radio) - bandpass filter - External Antenna Tuner - Antenna
So the
What I would like to see is ability to control amp from a smartphone, either
native app or a web page via login/password. I've been working on the latter
using a Raspberry Pi in the shack talking to the amp via Ethernet. It acts
as a web server. I have the telemetry working now and next step is
John,
The recommended troubleshooting steps in cases like this is to remove
everything from the K3 except the power cable and the coax to a dummy load.
With that done, does the problem still appear - if so contact
supp...@elecraft.com.
If it does not appear, then plug things back in one at
The OP was talking about 144 MHz. For weak signal work I can't imagine not
using a mast-mounted preamp. Even with sub 1 dB NF devices (that we paid dearly
for when I was on EME) located in the shack, line loss is a killer.
Wes N7WS
On 7/4/2019 10:01 PM, Jim Brown wrote:
In today's world, a
That isn't quite right either. The preamp gain must be much higher than the
following losses to minimize second stage degradation. (Line loss degrades the
NF of the second stage)
Wes N7WS
On 7/5/2019 5:35 AM, Martin wrote:
That's not quite right. The overall system noise is determined by
That's not quite right. The overall system noise is determined by the
preamp noise figure when mounted as close to the antenna as possible.
Cable losses (=noise) after the preamp can be neglected, as long as the
gain of the preamp is higher than the losses in subsequent components.
So the
Hi All.
Internal transverter possible to use but with external BPF
de 4z5cp
-- Original Message --
From: "Michael Walker"
To: "Elecraft Reflector"
Sent: 05.07.2019 14:43:36
Subject: Re: [Elecraft] Digital modes on 144MHz only
Hi
These are the Transverters I use.
Very good
Hi
These are the Transverters I use.
Very good quality and they can be 10mhz gps locked.
http://www.q5signal.com/
Mike va3mw
Sent from my iPad
> On Jul 5, 2019, at 7:16 AM, Conrad PA5Y wrote:
>
> Neither!
>
>
> I would buy a good transverter to use with a K3S. Two obvious choices.
>
Neither!
I would buy a good transverter to use with a K3S. Two obvious choices.
https://shop.kuhne-electronic.com/kuhne/en/shop/converter-transverte/transverter/TR+144++PRO++Transverter/?card=1621
TR 144 - PRO, Transverter - Kuhne Electronic Amateur Radio
Good morning
Do you have any external programs connected via CAT control?
Mike va3mw
Sent from my iPad
> On Jul 5, 2019, at 6:58 AM, Roy Koeppe wrote:
>
> John, I think you may have won the Unique Problem Award with that one. Good
> luck (sorry).
>
> Roy K6XK
>
>
> I am trying to
John, I think you may have won the Unique Problem Award with that one. Good
luck (sorry).
Roy K6XK
I am trying to run down a CW transmit problem on my K3s. Anytime I change
the mode from LSB or USB on any band to CW it starts to send a “dit” without
stopping and I have to halt it by
The problem is in the male and female connectors. I don't think a shorter
power cable will do anything. There is no substitute for replacing the
connectors.When I had mine act up Elecraft sent me the wrong parts. I had a
contest coming up and wouldn't have enough time to get the correct
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