Bill
DX Engineering stuff is very well made and I wonder if perhaps some of the
difference between theirs and the Elecraft BL2 is more a question of size.
I'm wondering if you could be getting the same amount of heat in each balun,
but the huge bulk of the metal-encased 10kW DXE product
Bill
It is quite likely that the heating effect is different on each band and
some bands will prefer a longer feeder than others. The swr that the
matching unit provides is easy to measure but only tells us what the
transmitter sees. W8JI has a lot to say on the subject.
73
David
G3UNA
Tried replying to you direct Dave G., but keeps bouncing.
Is that '65 Mk III Sprite the little UK sports car known here as the
bug-eyed Sprite?
David
G3UNA
sorry for the 'Crafters' bandwidth
Regarding quotes...
I find no mention regarding this subject in the ELECRAFT email LIST
GUIDELINES
Sorry if this has been answered already: presumably, this can also be used
with an SDR rx on the IF?
David
G3UNA
The nice thing about an 'all-in-one' solution:
1) Just one USB cable connected to your radio.
2) Very high quality soundcard.
3) Winkeyer built-in.
4) Extra COM ports.
5) Monitor
--
From: David Cutter [EMAIL PROTECTED]
Sorry if this has been answered already: presumably, this can also be
used with an SDR rx on the IF?
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I too have that problem. The thick washer on the inside doesn't fit tightly
to the front panel, so it's a loose fit. The connector flange protrudes
through too far to put a lock nut on the front.
David
G3UNA
K3 547
I am more concerned about the amount you can wiggle the mic connector. It
The manufacturer has used the wrong cable type, it will not get better with
time. It should not be ordinary pvc. Send it back, there's a batch
problem.
David
G3UNA
- Original Message -
From: DW Holtman [EMAIL PROTECTED]
To: Ken Kopp [EMAIL PROTECTED]; elecraft@mailman.qth.net
I would be, but my times are very variable at the mo and my antenna would
be NVIS, ok for local stuff
David
G3UNA
ok, yes that's a bit late for me.
Is there anyome in Europe interested in a K3 Euro SSB net ?
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I wonder if it will be possible to shorten rise times as the keying speed
increases without needing manual intervention. Only set the desired timing
for one speed and the program fixes others automatically; or not as desired.
David
G3UNA
___
I wonder if this is related to the problems some have had setting the
passband when operating WPX this weekend.
David
G3UNA
ab2tc wrote:
Is it just me or is the graphic display of the IF passband rather
erratic?
No, it's not just you. I find switching between lo/hi cut and
Hi Tom
You make a good point. I say offer both and let the market decide.
David
G3UNA
Tom said
Every year on various forums this subject seems to come up at least twice.
Every year the question is always answered by experts who always agree:
If you’re using your rig in an F-14 – crimp.
Mode: cw, paddle sending string of dots or dashes any speed
power o/p: any, ie nil to max, dummy or antenna
filter: any, but more pronounced 1kHz
listening to side tone on phones or speaker
audio control: max
rf control: start low and raise until the artefact appears
or
rf: max
audio: low and
The effect is also present with monitor at zero. In this condition, a
rushing sound is heard. At a guess I would say it is digitally induced
noise.
Mode: cw, paddle sending string of dots or dashes any speed
power o/p: any, ie nil to max, dummy or antenna
filter: any, but more pronounced
This is a re-post to see if it attracts comment.
This concerns an audible artefact using QSK cw mode. When either rf gain or af
gain are at maximum, there is an additional noise which accompanies the Morse
characters. This can be demonstrated as follows:
Mode: QSK cw, paddle sending string
I agree: The best lengths for a doublet are 44ft and 88ft and multiples
thereof. Have a look at Cebick's site. These lengths avoid nasty tuning
conditions which can create large voltages and inefficiencies in your
matching unit.
73
David
G3UNA
- Original Message -
From:
Lisa tells me that if you ask, you can actually buy the ready-made cable
from Elecraft at $10. In my honest opinion you are well advised to order
this with your kit. If you order the ready-built K3, this is what you get.
David
G3UNA
Bill,
Yes, the power cord parts are included with the
The only thing not in the archive is that you can buy the ready-made cable
from Elecraft for $10.
K3$2-3000
Cable$10
Ship, tar, ha'porth.
David
G3UNA
On Sat, 19 Apr 2008 13:50:32 +0100, you wrote:
Yep, I confirm that.
And we seem to be opening up an old thread again, all this
I insist on putting a fuse on each battery terminal, preferably fixed right
to the terminal. The additional voltage drop is worth the peace of mind.
Car radio shops have big chunky ones at modest prices.
David
G3UNA
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Forwarding this to the Elecraft list, I know many of you will have known LB
or at least his work.
David
G3UNA
From the Antennex list:
Folks:
This is the saddest announcement we have had to make:
It was discovered this morning that LB
As others have said, my first paddle was a hacksaw blade but take care of
the sharp points!
Better is a strip of pcb material, or 2 strips with a separator for iambic.
From memory I used about 5mm wide and about 40mm from the fulcrum, which can
be just a wood block with 2 slots cut and a
I should have added how I made the contacts: I filed slots in the side
panel and fitted M4 washers with M3 screws to give me some adjustability in
contact spacing. That made for a rather hard contact, so, you might find a
way of springing the grounding contact and it will be more comfortable.
Brilliant ! Beats my pcb method.
David
G3UNA
How about paper clips? I made this one a while back and it works great.
http://home.comcast.net/~fairbank56/clipper.jpg
Eric N3EF
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You must
An old friend, G4AYP, now SK used to listen to 40m cw just before going to
sleep using his Norcal 40. He tried to follow French and Spanish stations
and said it kept his brain alive and stimulated. He was UK Director of
Forensic Science, so I don't think it was an idle statement.
David
Wire the dc cable direct into the rig and let the other end do the
disconnect. Less dc loss and no contacts to worry about.
David
G3UNA
I know the powers that be don't like complaints about the APP, but, the
Factory mounted APP's on my K3 had one of the blades recessed at least 1/8
inch
Similar to vinyl vs. cd
David
G3UNA
Mike,
I believe it is all in the perception. The K2 is all analog (unless the
KDSP2 is active), but the K3 processing is digital. Each has its own
advantages and artifacts to contend with. Analog can soften the
background noise while the digital DSP
I would be tempted to replace the 120VAC relay with a dc relay and key it
directly from the rig. Don't forget to fit a diode across it to squash the
back emf. This may have other ramifications and might not be this simple,
but it's well worth consideration.
David
G3UNA
The FAQ for the K3
I agree completely
David
G3UNA
I am one of the people who requested that the ATU active / bypass settings
could be stored along with ANT 1 / 2. The reason was that the antenna I
don't want the ATU in circuit for is externally tuned. I still need to put
out a tuning signal, and I guess that
I gave my firm's address, so it came all the way by UPS and what's more they
didn't want the VAT in advance, it just went on the monthly VAT import bill
to my firm, so I got more time to pay and no delay. This is probably a tip
!
David
G3UNA
___
My temporary antenna is a low doublet up 15ft max and bending around the
garden for 88ft per leg, this passes thro the wall in nylon tubes then by a
few feet of ladder line to a PL259 on the back of the K3, no coax, no
baluns. The auto atu makes a good match top to ten. Regularly hear
Way before his time: that little ditty is ascribed to
Robert McCloskey, State Department spokesman, Vietnam war era.
Used by many since, like so many good sayings. Churchill was good at it
too.
David
G3UNA
Thank you Alan Greenspan!!
Doug
W6JD
-- Original message
I'm not familiar with SR5, but the peak at 1600Hz MAY be deliberate: this
has been used by some to increase readability in voice channels, though, not
sure if this is good in the presence of high noise as on HF.
David
G3UNA
- Original Message -
From: n4lq [EMAIL PROTECTED]
To:
Tell us about it
David
G3UNA
If you guys are excited, you can only imagine how some of us who have
hardware on board feel!!
Al WA6VNN
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Nice work, Bob.
I've seen 78 series regulators die with over voltage but never over current
or temperature, they have excellent protection for those.
David
G3UNA
- replace the 78L05 as its not clear how much abuse it had suffered.
73 Bob G3PJT
Would your rule be covered if you had to hold in another button at the same
time as hitting the memory button? Or, say, turn the power to zero before
making memory additions...
David
G3UNA
In the world of ergonomics and man-machine interface design, there is a
rule: If an action will
Another SDR is advertised by Elektor
http://www.elektor.com/
GBP72 for the assembled and tested pcb.
David
G3UNA
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Subscriber Info (Addr.
I came across this in Elektor which folk might want to try with their sound
cards.
Go the www.elektor.com site and log on as a new user, which will allow you
to download quite a few articles free, after which you have to pay. Find
the June 2007 issue and then the SDR Soundcard Tester
Glad you raised that point, Brian. In my Sunday school classes I ask the
question: what does the fuse protect? It's a revelation to all when I
give the right answer.
On our 240V distribution system, a melted cable can lead to a severe shock
hazard and I'm guessing that in the 110V
I'm hoping to do some experimentation with diversity reception to
significantly improve weak signal reception and reduce QSB. Something I
know very little about and want to learn from those who have done it with
other more elaborate systems: I hear the K3 offers most, if not all of what
is
I find it difficult to believe that a filter will go bad between
manufacturer and customer. Perhaps the odd one in 1000 might get past the
manufacturer's test regime. Modern surface mount components and hybrids are
very sturdy and no postal service could impart sufficient vibration or shock
Well, the radio seems ok, but there will be occasions, such as operating
near to very strong in-band signals when it may perform less than
satisfactorily and it is hard to identify what is happening. There may well
be artefacts that are disturbing and only heard on odd occasions such as
this
One thing I haven't heard mention so far: I believe these boards are made
to the latest ROHS, therefore lead-free solder is used, therefore the
de-soldering temperature is higher than some irons might be capable of. At
my place of work we had to replace all our irons with higher temperature
Add my name to that, for future firmware addition.
David
G3UNA
So RX equalization is most useful to those of us who like a wide CW
filter b/w.
Yes, Bud, it would be very nice if the RX eq was mode specific.
73,
Drew
AF2Z
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I run a 2 x 88ft doublet straight into my K3 and it matches top to 10
David
G3UNA
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matching one
or more bands (long tuning time)?
- Jim, KL7CC
David Cutter wrote:
I run a 2 x 88ft doublet straight into my K3 and it matches top to 10
David G3UNA
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This is what I posted yesterday. You might look back in the Elecraft
archives for similar postings from others: I do agree with Simon about
verticals , if you are *close* to the wet, they will perform exceedingly
well. My antenna is very simple, just wire.
It's temporary, but works fine
I think I must be missing something.
As I understand it, the additional crystal filters are only really necessary
when operating with very strong adjacent signals in the passband. So, if
you don't have a need for rejection of such strong signals, let's say 40
over S9 (somebody correct this
Bill
I don't follow how filter offsets degrade oscillator tracking, ie to make a
beat frequency. Sorry if I'm being thick.
David
G3UNA
What would be the effect of unmatched filters? You would have a beat
frequency, such as I mentioned with Orion above, which would be the
difference in
The reason I'm particularly interested is because I fancy doing diversity
reception and de-select my roofing filters in the main rx so there is no
phase shifting relative to the second rx without filters.
Have you de-selected the roofing filters to do a comparison with and
without?
David
But if you leave the setting at its nominal, can you hear the difference as
that bandwidth is selected? I'm not sure I understand the advantage you are
gaining by bringing the crystal filter in later; I'll do if there's
something to be gained, it sounds an interesting approach.
David
G3UNA
Leigh
From your research, would you conclude that the machine did not comply with
emc regulations?
This sort of problem is, as we all know, common with many imported
computers, shipped with filters designed in but obviously missing.
Is this a sign that industry in general is prepared to save
I used a Honda on field day a few years ago, (240V mains outlet) and was
staggered by the amount of SMPS noise. I fitted a big filter grounded local
to the generator about 60ft away that made it tolerable.
David
G3UNA
- Original Message -
From: Wes Stewart n...@yahoo.com
To:
A quick look at the circuit diagram shows that buttons are taken from a
potential divider to CD74HC4051M inputs. These switches (unless I've
misread the diagram) will therefore take the input current of the
multiplexer which is typically 1uA. I don't know the spec for the Elecraft
switch but
A different approach might work better: what these firms are practising is
fraud or misrepresentation and we get a lot of that over here. Passing it
off as something which it is not as any other consumer goods is illegal.
It's also illegal to use an agency sticker like that. Over here we
A peak limiter combined with a fast short or open circuit is the only way to
prevent ear damage. I've listened to earphones protected by vdr and,
although the peak voltage delivered to the headset is limited, the waveform
simply flattens off and the audio power pulse is still deafening.
This
This is an interesting site and they are keen to promote hearing health.
http://www.headwize.com/projects/limiter_prj.htm
David
G3UNA
snip
If I may chime in here, I hope very strongly that nobody is using deep-
in-the-ear type earbuds with the K3 or any other radio. TO DO SO
MIGHT
There might be 2 distinct problems: a) the bandwidth of the signal you
think you have and b) splatter caused by over-modulating and over-driving.
Starting with a wide-ish signal of say 6 or 7kHz, ie dsb full carrier might
be ok in uncrowded bands, but add badly adjusted modulation and drive to
The way I did it was to point at the link on that site and right click, save
target as...and put it in a convenient file. When it has downloaded, it can
then be played back. I haven't listened to all of it but it's good so far.
David
G3UNA
- Original Message -
From: Nels Nelsen
I can see how c = yes, derived from confirm = cfm, but when I was a marine
op it was y = yes
David
G3UNA
- Original Message -
From: Bruce Beford bruce.bef...@myfairpoint.net
To: elecraft@mailman.qth.net
Sent: Sunday, October 11, 2009 6:03 PM
Subject: Re: [Elecraft] Shorthand
Here's
I agree with others that on the amateur bands we use R or EN for yes. Thanks
for the correction.
David
G3UNA
- Original Message -
From: Lee Buller
To: David Cutter ; Elecraft Reflector
Sent: Sunday, October 11, 2009 9:39 PM
Subject: Re: [Elecraft] Shorthand
Actually
Hi Ian
Wish I could join you; however, clocks go back 2am Sunday, so, z = local
time; winter is coming... :-{
73
David
G3UNA
Hi all,
I will be running the net as usual on 3.658 +/- QRM this Sunday. I don't
think the contest should bother us at 09:00 local (08:00z)
I hope to see you
Putting several in parallel on a suitable outboard heatsink is not expensive
and, properly rated, will cater for any load. As with semiconductors, the
trick is to not exceed the junction temperature. As always, follow the
manufacturer's recommendations then add your own fiddle factor. MIL
I have a QRM Eliminator by SEM (a UK firm long gone) awaiting repair and I
wondered how best to use this in conjunction with diversity. It is a
phasing unit requiring another small (probably vertical) antenna to pick up
local QRN, which is theoretically cancelled using its 3 controls. I
I completely agree and it was the same revelation for me when I first
switched on my K2 on 80m sat next to a FT1k at G6MC contest station: simply
astonishing.
David
G3UNA
I've read all the posts in this thread and have to say ... I just don't
get
it. What noise?! If anything my two
Jim
I know of a military amplified loudspeaker which *should not* suffer from
RFI, since it passed the required emc specs for land vehicles. They're
nothing like $3000, but certainly not really for amateur budgets. Starting
with a metal enclosure helps a lot. I have a few rejects if anyone
Be nice if we could order from Elecraft, especially from outside US, along
with other bits on order.
David
G3UNA
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product with quality parts. A one-stop shop if you like.
David
G3UNA
- Original Message -
From: Julian, G4ILO julian.g4...@gmail.com
To: elecraft@mailman.qth.net
Sent: Thursday, December 24, 2009 10:11 AM
Subject: Re: [Elecraft] Source of mating ACC cconnector (K3)
David Cutter
What was the delivered price into UK, Geoff ?
David
G3UNA
Regarding the new DSP board, I was not one of those who had issues with
the
old one or considered the K3 to be noisy on rx and I ordered the new one
simply to keep my K3 #266 up to date. I use SSB almost exclusively, these
days
Would it be possible to write a macro to suit this?
David
G3UNA
Hmmm. I think the software feature you want is already in the K3.
Use, the CW mode, adjust the keyer to 30 WPM or so, and you have a 50%
duty cycle pulser - just hold down the dot paddle. If you want a
lower duty cycle,
Dave
I would gladly fit this daughter board and perhaps do the LF enhancement,
but several on this list seem to be saying that the exchange DSP board does
something more than these mods provide.
Can anyone clarify?
David
G3UNA
Take a look at the K3 mods section, guys. The DSP board
If the K3 is being used by a contest group or dxpedition, for instance, you
will have a wider range of hearing sensitivities and these activities force
us to concentrate a lot more and use a radio for long periods. On this
basis, fatigue due to these artefacts should be eliminated for the
John
Can't help you with numbers, just the experience of friends in that
situation, ie they can operate with special receivers having special mixers,
often home brew, whereas it is impossible without.
David
G3UNA
David Cutter wrote:
Some folk suffer extremely strong QRM from broadcasters
Hi Bill
Here's my two penn'orth:
Operating in dxpeditions I usually use around 28 to 32wpm, down to 20wpm
depending on conditions, eg 160m. In ideal conditions I would get up to
around 190 contacts per hour and my friend SWH would get around 260 at
similar speeds. The bottom line is that 3
When I get around to joining mine together, I will not use ALC.
David
G3UNA
Guys,
Does anybody here use the K3 with the IC-2kl amp? Is the negative ALC
modifcation really necessary?
73, Chris-OE5CSP
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Sounds like this one:
http://users.erols.com/k3mt/graswire/graswire.htm
A few minutes before the start of the ARRL 160m contest I decided to try
something I'd heard about. I took about 180 feet (55m) of wire and laid it
on the ground from my shack, across the backyard, around the back of my
The way I explain it is to say
If your roof leaks only when it rains, do you blame the rain or the roof?
David
G3UNA
A PR problem exists here. It is difficult to get a consumer to understand
why his brand new (whatever) is malfunctioning. The problem happens only
when you transmit,
So, if you made it 19% longer with some zig-zags, it would be resonant in
the middle of the cw band and no need for matching, just connect to coax. I
imagine it's fairly broad band being so close to the earth.
David
G3UNA
David Cutter wrote:
Sounds like this one:
http://users.erols.com
Paul
I'm always a little wary of this scheme since using it myself a while ago
and not getting the results I expected. I would call it a limiter not a
crowbar.
I'm guessing these supplies have a relatively high (compared to conventional
linear regulator) output resistance and when I've
I think the term used for the SI is coherent, ie 1 x 1 = 1, none of your
dynes, cubits, foot-pounds etc. A pity our cousins from across the water
are not all on board the SI express.
David
G3UNA
On 12/8/2008 9:49 AM, Barry Garratt wrote:
Actually a radian is an angular measurement
I used a large food container from the supermarket. I jammed blocks into
the front corners to keep the tuning knob away from the box lest it got a
knock. Clip-on top made the whole thing very cheap, light weight and
robust. Put that in regular travel bag with any padding you like, eg
Here's a site that will show you K1 thro K8 and some KXs, some connection
with communications :-)
http://www.redphonebox.info/history.htm
David
G3UNA
VK5ABQ shanewh at gmail.com
Why the mountain Don?
It's named K2 - like the Elecraft radio. ;-)
600ohms still seems to be the practice for ship and aircraft intercoms that
I've come across recently.
David
G3UNA
Yes. 600 ohms has not been part of audio practice, pro or consumer, for at
least 40 years. ALL line level and mic level audio circuits, pro and
consumer, are low impedance
Firmly agree, it's so easy to be out of date and miss things.
David
G3UNA
To that end, perhaps the Config Menu (incorporating new firmware updates)
could be posted on the website for replacement of the (outdated) C.M. in
the manual.
but having the C.M. updates separately would be helpful.
Wayne
I will be doing all the mods for Christmas. Hope you can give us the info
really soon so I don't have to take the K3 apart again. Can you just point
to the circuit and tell us what you intend ahead of the official mod
instruction?
73
David
G3UNA
To this end, we're working
on a
Didn't they use something like this in the space programs?
David
G3UNA
K3 SSB Contour Filter
Recently I was reminiscing about Narrow Band Voice Modulation which
was developed in the late 1970s by Tom Lott VE2AGF and R.W.Harris,
WB6CZX. An important part of this system relies on the fact
Hi Phil
I think the first thing that occurs to me is: are you feeding this loop with
one coax and just switching between bands?
David
G3UNA
I use my K3 to participate in a daily 10m CW net (28.130, 7pm PST).
I've been experimenting with two antennas for the net: 40m full wave,
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:
Gary
You could wire the power cable direct to the pcb inside the K3, that would
further reduce your losses and avoid connector damage/intermittence if it's
being wiggled a lot.
David
G3UNA
- Original Message -
From: Gary Smith g...@doctorgary.net
To: Elecraft@mailman.qth.net
Sent:
Jan
Perhaps you could share with us all the ideas and adjustments you made.
David
G3UNA
Rick, and others
Received some good ideas from some nice people here on the
reflector. That together with some studies of my own
led to bias adjustment on the KPA100
Have you measured the transient response time? Should be easy to see a 1V
transient with a modest scope.
David
G3UNA
It would be interesting to check the voltage drop from the APP on the K3
to the cathode of D11 ( component of KPA3) when under a 100 watt load. 73
Gil K8EAG
Cascading
Joe
It's not just incompetence, we, well me/I, need a little help when
bleary-eyed from lack of sleep, say in contest when things go wrong ; as
they do...
David
G3UNA
- Original Message -
From: Joe Subich, W4TV li...@subich.com
To: 'Ian White GM3SEK' gm3...@ifwtech.co.uk;
That's a good thought and provides instant isolation, but have some thought
about the back emf off the coil - it could exceed the rating of the keying
transistor. I measured 800V on a very fast scope many years ago from a reed
relay. Just sticking a diode across the coil will slow it down a
: Don Wilhelm w3...@embarqmail.com
To: David Cutter d.cut...@ntlworld.com
Cc: elecraft@mailman.qth.net
Sent: Sunday, February 15, 2009 1:37 PM
Subject: Re: [Elecraft] K3 external qro keying line
David,
The back emf pulse from a relay occurs when the coil circuit is opened,
and its polarity
Dow Corning make a range, 3140 is one I've used. It's very expensive
compared to the acetic acid bathroom sealant variety.
David
G3UNA
- Original Message -
From: SidShusterman k...@comcast.net
To: elecraft@mailman.qth.net
Sent: Monday, March 02, 2009 10:21 PM
Subject: Re: [Elecraft]
To avoid the joint in the middle, I've used the all-copper ladderline, ie
not the copper coated steel variety, it's a lot smaller and lighter, I think
it is supposed to be 450ohm (correct me if I'm wrong) it's about 10mm wide,
light grey. I like the fishing swivel idea attached to the ring in
This happens to me quite often. I've found it is my ISP and it's not just
Elecraft postings. I have to delete the postings via webmail otherwise they
keep downloading scores of copies.
David
G3UNA
- Original Message -
From: Roy Morris w4...@carolina.rr.com
To:
Hello Frank
May I ask what relays you use? I imagine there are some high voltages under
some conditions. Do you run high power?
Thanks
David
G3UNA
- Original Message -
From: Frank R. Oppedijk f.opped...@avista.nl
To: Elecraft_List elecraft@mailman.qth.net
Sent: Thursday, March 19,
Jack's Z90 did it but he no longer makes them.
http://www.cliftonlaboratories.com/Z90.htm#Z90
David
G3UNA
- Original Message -
From: Joe Word joe.n...@gmail.com
To: elecraft@mailman.qth.net
Sent: Friday, March 20, 2009 11:06 PM
Subject: [Elecraft] K3 - Stand Alone Panadaptor
Has
I know this Professor, he has an assistant George Izard O'Veering
David
G3UNA
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Perhaps the time is now right to replace domestic lighting circuits with 12V
supply, then the cost of the fitments will come down, ie no need for
110/240V conversion to low dc for the leds. Safer, cheaper, more reliable,
less raw materials. At those power levels, you could probably keep the
The usual diode across the coil is simple and effective for the vast
majority of situations but the rate of change of current can induce
undesirable effects in nearby sensitive circuits which the diode
exacerbates.
For most relays we see in ham rigs a 1N400x series diode is often used, when
a
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