transmit power is set to 10 watts.
mode is AM, but that doesn't seem to matter.
When I press tune into a dummy load/swr meter, it tunes normally:
The K3 shows swr and power on it's meters.
external swr meter show power also.
swr is 0.0 on both the K3 and the external swr meter.
When
Clarification:
I press the tune button and it tooks.
When I press the the xmit button little happens.
When I press and hold down the xmit button it goes into permanent rune mode
and it show output and swr just fine on the K3 and the swr meter.
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.
The R3 Vertical was doing.
It's been up for a very long time and when I switch to the new antenna all
the problems go away.
Larry Lopez N2CVS.
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What's interesting is that all of 60 Hum and it's harmonics are gone.
The line out is 2.
I have the Mike volume:
Balance is all the way over to one channel.
Volume in full
I adjusted line out to flat top and halved it.
The JT65/JT9 display looks good now.
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Thanks Jim Rick for your help.
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__
Elecraft
So I decide to give up and set the audio level right.
So I get the free for private use sound card oscilloscope
http://www.zeitnitz.de/Christian/scope_en.
I picked this one because it was first when I goggled sound card
oscilloscope.
Very nice.
But gee, there are 2 channels for the mike and a
I'm not sure what I am doing wrong.
WSJTX does not seem to be setting
VFO B frequency with the K3 in split
mode and with WSJTX in split mode.
Many web pages sat that in split mode
WSJTX moves the split fequency around
in 500 Hz increments so that WSJTX
can cover the 4K Hz width of the combined
Thank you for helping.
I have set K3 to split, the TX arrow points down.
I have set WSJTX for Split in the configuration check box.
I have no controller, WSJTX talks to K3 directly
using elecraft USB serial cable (from elecraft elivered Monday).
WSJTX cat control gets and sets frequency correclty
I'll try it tonight.
I bet it's because I haven't been setting the frequency on the VFO B !!!
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I needed to clone A- B
I needed to go to DATA A mode.
Thank you very much !!!
Larry
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I needed to clone A- B
I needed to go to DATA A mode.
Thank you very much !!!
Larry
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The 15 K Hz signal from the DSP is a SSB signal.
This is the second IF frequency (from the antenna side).
When this is mixed with the 8.230 Mhz in you
end up with the sum and difference with the 15KHz:
Namely 8.215 and 8.245 MHz.
The 8.215 MHz filter is used to remove the
unwanted 8.245 MHz
The schematics show two internal crystal filters:
one on the receive path (2 poles) K3 RF Board
It's marked BW 14 kHz. 8215.0 KHz.
This has no relay to bypass it.
one on the transmit path (4 poles) KREF3 REF/2ND TX IF
It's marked 8215.0 kHz, BW=4 kHz
This has a relay to move to bypass it.
This is actually covered already but I need to mention it.
When the WSJTX waterfall started losing signals into the noise
I noticed that there was a neat periodic set of signals that
lined up with the frequency ticks. Eventually it dawned on me
that they were 120 Hz apart and eventually I found
I was wildly optimistic in this.
A second source of hum is the switching supply
of the laptop.
It's similar to the power supply hum.
Even though it's clearly a switching supply.
Curiosly the laptop need 12 volts.
So perhaps I can pick that off of the linear
power supply.
Or maybe run everything
I switched to a Creative Sound Blaster X-Fi Go!
USB dongle and that got rid of the hum from
the laptop charger.
I got this originally because the desktop
I use has no sound support at all.
It was an extremely cheap server box
that runs Linux.
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This is just in case someone out there has misplaced trepidation.
Installation KBPF3 and KFL3A-6K was easy.
It took an hour making believe it was brain surgery.
In a pinch you can get a wrist strap (or even a static mat)
at radio shack.
You want good screwdrivers.
Read the instructions.
--
I've uploaded the firmware using K3 Utility.
I want to save my configuration and nothing else
the log contains:
02:17:11 Elecraft K3 Utility for Linux Revision 1.14.4.11
02:17:11 K3 boot loader is waiting for MCU firmware load.
The firmware information section shows things like:
get or make a real cable tomorrow if I can.
Otherwise I'll get it from ebay or elecraft.
Thank you for you for your concern.
Larry
Pierfrancesco Caci [via Elecraft] wrote:
Larry == Larry Lopez [hidden email]
/user/SendEmail.jtp?type=nodenode=7588481i=0 writes:
Larry I'm going to test
Getting a brand new 25-1402 cable
from radio shack made everything work.
It's now showing the installed firmware versions.
The save configuration button is no longer shaded out.
Perhaps my hacked together cable wasn't working right
somehow.
2 RXD_OUT
3 TXD_IN
4 DTR_IN
5 COMMON
7 RTS_IN
--
My K3 just came in by ground UPS.
The serial port doesn't seem to be working.
I tried K3 Util on Linux and it said K3 not responding.
I got a terminal program and short receive and transmit
at the Elecraft end and it echoed ok.
That means that Linux, the serial port and the cable are ok.
I
No USB to RS232 converters were used.
This is not a USB problem.
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I'm going to test the cable in the morning.
I have two cables neither which works.
The one which came with the rig seems to be a cross over cable.
The one I tested is an APC connection cable which just happens
to have continuity on pin 2.
I get or make a real cable tomorrow and see if that works.
It was the cable sent to me.
I tested it wrong and thought it was a straight through cable.
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Harry,
What filter are you using ?
It's my understanding that it's wider with
a AM (6 K Hz) or FM (13 K Hz) filter.
at least I home so. I bought a AM filter
and my K3 hasn't arrived yet.
Larry
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This is for pure information purposes.
I don't even have a K3 yet.
I am under the impression that all of the
crystal filters that Elecraft sells except
for the 5 pole filters are made by Inrad.
I am also under the impression that all of the
5 pole filters are made by Elecraft in house.
Do I
Now I'm in real trouble !!!
FYI...Elecraft takes PayPal.
Keith
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I looked again, and I didn't see Paypal as an option.
but then I used google and found this on the Elecraft web site:
We also accept payments directly from your PayPal account. (Funds transfers
only - Use our regular credit card option at checkout for cards.) Use our
regular shopping cart system
I ordered from Inrad 6KHz AM filter.
I bought on ebay a Astron RS-35M Power Supply
I figure even if it has something wrong with it,
it will be easy to fix.
Thank you for all the help.
It's been mind bogglingly interesting.
Larry
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Actually the worst case is this:
You take your package to Staples Friday
after the last pickup.
It sits at Staples until Monday afternoon.
It moves by ground Tuesday - Friday.
It stops over the moving over the weekend.
Then completes it's trip the next week starting
on Monday.
*** USPS
USPS ground is 5 days, not 5 business days.
USPS ground moves on the weekends.
UPS ground does not move on the weekends.
UPS drop off at Staples at 5:30PM Friday
doesn't get picked up until 5PM Monday
This isn't a criticism of anyone.
It's an explanation of what has been observed.
I look at it
I'm after a perfectly working late model K3 with all the mods.
To be sure a 10W K3 with no options would get me started.
But I really need the ATU
There is a price increase at the end of the month so that's
my time frame.
K3/10 K3 10W Xcvr.
KAT3K3 ATU
KBPF3 K3 Gen. Cov. RX Module
wow.
So probably the only delay in there is not getting
it the UPS office on Friday and having it wait
untiol monday afternoon. 3 days a staples.
Thanks,
I was sorely wrong.
Larry
Phil Kane-2 [via Elecraft] wrote:
On 4/23/2014 5:24 AM, Larry Lopez wrote:
USPS ground is 5 days, not 5
It turns out that the Elecraft 2.7 KHz 5 pole filter is the winner
according to:
http://www.qsl.net/gm3woj/k3filtertestssn2203.pdf
which makes me want to make my own filter.
Still, I'm going to keep the 400Hz 8 pole filter which
is coming with my S/N 27xx Elecraft Radio !!!
--
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And just for the record.
If you are going to optimize for bandpass shape
then you are going to have non constant group delay.
If you add more crystals you can have both and the
filters would be more expensive.
It's a compromise and we demand this compromise.
A phase linear filter looks bloody
Some of the wider filters in that paper are pretty good.
The narrowest filters are not so good.
The flat part of the passband has constant group delay.
The skirts are awful
For narrow filters it starts going weird.
Larry Lopez [via Elecraft] wrote:
It turns out that the Elecraft 2.7 KHz 5 pole
Hi Phil:
too bad I didn't jump on it.
i didn't realize it had the subreceiver !!!
73,
Larry
Phil Hystad-3 [via Elecraft] wrote:
Don,
OK, I may be expecting too much. Actually, I am not sure if I was
expecting as much as I was a little bit surprised by the behavior. I
didn't think that
I'm note sure the title makes any sense.
Now I hate to admit this but I've had more
contacts in the last two month than in the last
ten years using JT65HF.
I'm using a FT-1000D with BPF on 20 and 10 meters
with a Cushcraft Vertical. I think I bought it when
Cushcraft was still in NH.
I'm
With a 2.4 KHz filter (not on a K3) I only got partial band coverage on
JT65/JT9).
Is there any advantage to using a CW filter to look at a eq channels at
a time ?
Or is it better just to use the DSP to narrow it down ?
Larry
DGB [via Elecraft] wrote:
I have both those filters, 2.7 and 2.8
Thanks Joe and Jim:
So you need a linear phase filter.
Is the DSP filter linear phase ?
I'm searching for linear phase filter and ending up finding references
in this group !!!
Larry, N2CS
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I'm wondering if any digital filters exist for the K3.
I'm wondering which common filters work best on the K3.
I'm interested in JT65 and JT9
linear phase delay and constant group delay
means that the signal of different frequency
take the same time to go through the filter
so that the waveform
JT65:
http://elecraft.365791.n2.nabble.com/JT65HF-Data-Mode-A-td7513437.html
my FT1000D was USB.
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But what about EME.
You want a narrow filter and you want constant group delay.
I'll research that as a separate topic.
Let's close this out.
In a pinch the 5 pole filter which comes with the rig is ok.
6K AM, 12K FM are recommended making up selectivity
in the DSP.
Narrow filters recommended
Thank you Jim,
I read all your posts.
I'll quote your quote of K1JT again here:
K1JT says that it is best to run the radio broadband and let the WSJT
software provide the needed selectivity in its decoding algorithm. The
reason is simple -- phase shift can cause decoding errors,
Now with EME this isn't much of a problem I would think.
If no strong signals are present then the DSP wold be able
to shrink the bandwith just fine.
Even though a wide filter lets in a lot of noise
the DSP can get rid of it.
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Oh my, I finally get it.
You don't even need the K3's DSP.
Thank you.
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This is wrong:
Even though a wide filter lets in a lot of noise
the DSP can get rid of it.
The WSJT software is a DSP.
It has it's own filters and the DSP on the K3
is not needed.
So the only job of the K3 is to produce a clean
wideband signal for the WSJT.
You would still have to prevent
I've already recanted on S/N ratio.
I was an idiot.
I kept skipping the part where the PC is also a DSP.
Sven's post on the other thread also brought my attention to it.
The only thing left is strong carriers overloading the receiver.
I'll go find WSJT and learn some more.
Thanks again Jim.
I'm wondering if anyone has a K3
that they would like to part with.
Tell me what you have
and what you want for it.
Serial number and condition
would be useful.
If the price is right.
Be sure to factor in that
the warranty isn't transferable
and that updates are needed.
Thank you,
Larry Lopez
I might be able to trade a little used
FT1000D/4 filters/BPF and original book.
But you would really have to twist my arm.
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I suppose an old base K3 in an opened box for good discount would do.
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I have no KX3, nor do I walk on water.
I just googled d = 000, ERR TxC, ERR TXS:
Out popped a reference to the KX3 Users Manual:
I searched the KX3 Users Manual manual says:
ERR TXC,
ERR TXS:
Transmit attempt without first calibrating TX BIAS in CW
(TXC) or SSB (TXS) mode
Perform
I wonder if this might be the problem !!!
There is a very interesting post with the title:
KX3 production firmware update, rev 0.97 -- very important bug fix, better
CW QSK, etc.
KX3 production firmware rev 0.97 (with DSP rev 0.84) is now available.
It corrects a problem in the power-on/off
The K3 has isolation transformers for the line input (mono),
and line output L and line output R (stereo).
There are 3 sets of 2 transformers.
In each set, the circuit diagrams shows the transformers
in parallel with opposed phase.
Please see the K3 Circuit diagram KIO3 Main Sheet 2,
top left
The transverter IF out from the K3 is a transmit signal.
If you connected KX3 to the K3 transverter output
then the K3 would be transmitting into the KX3.
I wouldn't do that.
If you connected the KX3 to the K3 IF output
the KX3 would be transmitting into the K3 IF output.
I wouldn't do that.
You
They made me take an ESD course
at work and well I have a few comments
I feel forced to make.
Forgive me.
static mats are poor conductors which allow the
charge to equalize slowly.
Humans, in fact are not poor conductors.
So the only purpose of the wrist strap
is to keep you at the same
http://www.sherweng.com/table.html
The LO Noise (dBc/Hz):
144 KX3
138 K3
130 R390A
121 FT-1000D
117 ICOM 720A
I'm wondering why the KX3 Lo noise is so much better than the K3.
The R390A value strange since the first local oscillator is a quartz
crystal.
I've owned a Icom 720A and own a
stop at this point.
Nothing is perfect.
thank you very much everyone.
larry lopez N2CVS
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