, PA 17701
David Cutter wrote:
A tidy arrangement, but I would have one less set of connectors in series
with the battery, possibly more: either I would solder the wires direct
to the KX1 pcb, or, not to spoil the KX1, I would eliminate the power
poles. The fuse and holder will drop quite
Hello Guy
Thanks for that run-down.
It never happens on the web access to my email and by the time I've loaded
up the web page it's usually stopped replicating. Anyway, these days it
only replicates once and then not very often. I felt sure it was some kind
of timing problem and probably
It happens to me occasionally, but it's not just this list. It used to
happen a lot over weekends. It doesn't happen so often and I've assumed it
is the flaky software from my ISP, or it could be something flaky with my
laptop having a bad hair day. It's happened to others - you are not
Try to fit a rubber or Neoprene sleeve/grommet between the mic boom and the
body of the ear shell.
David
G3UNA
- Original Message -
From: David Gilbert xda...@cis-broadband.com
To: elecraft@mailman.qth.net
Sent: Thursday, July 08, 2010 6:20 PM
Subject: Re: [Elecraft] [K3] weird VOX
Here is a nice unit from an ex-pat, Bob, big into contesting.
http://www.5b4agn.net/
Incidentally, if you fancy making one yourself I have sets of wound toroids.
David
G3UNA
Ok so I'm looking for an auto band pass filter to use with the K3...
Would be slick if the filter could be interfaced
Remove the connector and solder the wires directly; this also reduces IR
loss.
David
G3UNA
After watching the PP connectors on my K3 wiggle around at Field Day, I
have to question again why Elecraft chose these toads-in-a-tuxedo for a
connector. PP are way over-rated. The only strain
It begs the question what we should do with the 1000s of LP filters out
there. Some are built very well, like my Drake, but I also have a couple
made of bent tin. There was a QST article on them a few years ago showing
different construction styles and quite intriguing how costs could be
GM4ESD
David Cutter wrote on Friday, June 18, 2010 9:27 AM:
I was idly wondering if I should convert them to something useful,
perhaps
to a band pass filter. There's room to fit small toroid inductors
instead
of the solenoid types. Then again, with the Elecraft line up I probably
I like the near end fed which uses a small 1:4 turns ratio (1:16 Z ratio)
toroid at 10% from the end of a half wave dipole (for whatever band). Put
the transformer (and tuning cap if needed) into a film canister. This makes
the coax length shorter/lighter for a lot of situations. Being
I wonder what the sensitivity of the P3 is in this regard; I can't see it
in the spec on quick inspection.
David
G3UNA
George
I have a K3 s/n 3569 (factory built) which has RF Board Rev 3. I have also
checked inside the radio to see that the IF output modification has been
performed.
Another interesting link
http://www.siliconeer.com/past_issues/2005/january2005.html#Anchor--MA-32328
David
G3UNA
Dr. Amar Bose taught the introductory circuit theory classes (6.01 and
6.02)
at MIT for many years. He was unquestionably the best true teacher I've
ever had in my life.
A pro friend of mine cruises at 60wpm using the built-in keyer of my club
746 (Mk1) in iambic mode. I don't know what it sounded like at the other
end but the QSO lasted several minutes with many overs. I don't recall if
it was QSK. He made no complaints about the rig and he's used to all
This is a *little* OT, but I've just read in a 1914 WT book that they were
regularly running at 300wpm on spark transmitters. The very clever trick
was to operate the spark continuously and FSK it by switching between taps
in the antenna tank. The receivers were direct conversion using rotary
Tom
Copied by machine onto tape, then passed slowly in front of a typist who
read the ups and downs and typed from that. My father did this in the 30's
from recordings at 100wpm to his typing speed of about 30wpm. I've seen
the machines in the Poldu museum but they can't demonstrate them
And a UK telephone box of the 1930's
David
G3UNA
Isn't it also a mountain some find too hard to climb?
Sorry for the play on words...I just couldn't help myself..(:-))
Gary
On Wed, May 12, 2010 at 6:40 AM, Matt Palmer kd8...@gmail.com wrote:
K2 is actually derived from plant
Shame, that would allow individual values to be set up for each bc band of
interest, along with mode, band, bwidth, filters, etc.
David
G3UNA
- Original Message -
From: drewko drew...@verizon.net
To: David Cutter d.cut...@ntlworld.com
Cc: Elecraft@mailman.qth.net
Sent: Sunday, May 09
Sorry if I missed it, but, can a manual setting be set by a macro?
David
G3UNA
It would be nice if the K3 could remember the ATU mode (auto or
manual) per each tuning segment instead of just having it apply to the
entire swath of band. Then the SWBC segments would remember their
manual
Try sucking whistle rather than blowing and hold the mic away from the
mouth. Works for me
David
G3UNA
Guy said:
Whistling is usually 20-30 db louder than your spoken voice. That's
why people whistle when a shout doesn't make it. Takes a practiced
whistler to whistle softly.
K2AV
I would go for default to the sidetone frequency
David
G3UNA
...and while they are at it (Wayne told me it was on the list), do
something
to make it easier for us CW contester ops to use Notch. I wish, when one
first turned on Notch, that the default frequency turned up anywhere
T0-220 style power film resistors are fairly cheap and can easily be mounted
on heat-sinking surfaces.
David
G3UNA
Hm, I wonder if the KPA500 has or can have provision for this. That
amp can be driven to full output by 30 watts or so, IIRC. With the K3
(or K2), power control could be done
Sam
Is one of your aims to achieve diversity reception? If so, I don't think
you can with 2 separate receivers like this.
David
G3UNA
I want to use both my K3 and my K2
at the same time, on the same frequency and antenna.
I wish to TX and RX on the K3.
I also wish to use my K2,
which
Tom
You mention bonding in vehicles and this rang a large bell with me: all
military vehicles, land sea and air, require a separate dc return other than
the chassis for the battery negative terminal. Filter caps for emc are
returned to the chassis of the equipment which is strongly bonded to
I imagine latency to be small, possibly negligible if one uses a microwave
link line of sight. It's a dream I have to put my K3 in a remote spot with
line-of-site control via radio (amateur radio or possibly 2.4GHz
licence-free). Unfortunately I think there are licensing issues over here
Craig
Could you enlarge on that, sounds interesting ?
David
G3UNA
I know that the KAT3 remembers matches by band, but does it distinguish
between the ANT1 and ANT2 positions?
Indeed it does! And, you can also have the KAT bypassed on either
antenna
on a per-band basis. I use this
Duane
I would be interested to know more about your balun rated to handle high
swr stress, please tell.
I run ladder-line to the feed-point, and use a 1:1 balun rated to handle
high swr stress.
When you are doing your experiments, what does the SG tell you? I mean, is
there a way of
I used my K3 with built in matching unit directly into a low (avg 10ft agl)
doublet of 88ft per leg (somewhat bent) and a short feeder directly into the
PL. No rf earth, isolated mains supply. Worked well across 160 to 10. I
should have used a coax choke but it worked very well. It has
There must be a really good reason why amplifiers don't use on-board
switching supplies to get the weight and size down even further. An awful
lot of folks are using rigs powered by switchers which are obviously quiet
enough. Ameritron is an exception, but it's still outboard.
Perhaps an
Is that the exception that proves the rule?
David
G3UNA
There must be a really good reason why amplifiers don't use on-board
switching supplies ...
The THP HL-1.1 has a built-in switcher.
Phil - AD5X
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High isolation earphones:
A low cost solution is to use any in-ear type earphone that suits you plus a
pair of common or garden ear defenders. The earphone lead should be as thin
as possible so that the leakage around the lead as it exits the defender is
as small as possible.
Ear defenders I
Other phone contesters in the same room who don't have sidetone (monitor).
David
G3UNA
- Original Message -
From: Bill W4ZV btipp...@alum.mit.edu
To: elecraft@mailman.qth.net
Sent: Sunday, February 07, 2010 6:52 PM
Subject: Re: [Elecraft] K3 - 'High Isolation Headphones'
Tom
Eric
I suggested that a picture is worth a 1000 words and here is a leaflet from
the RSGB which explains some of the subject for UK amateurs. I'm sure
there's a similar leaflet from ARRL and other societies.
http://www.rsgb.org/emc/pdfs/leaflets/emc_leaflet07.pdf
73
David
G3UNA
Guys -
A picture paints a thousand words.
Point to a web page with all this drawn and save all this bandwidth.
Someone might be then able to compare one system with another.
David
G3UNA
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Home:
In my view, if it has to be one or the other, I would choose pre audio, ie
with no discernable delays. One of the biggest annoyances I've had in a
contest situation is adjacent operators shouting down the mic because they
don't or can't listen to a monitor of their own voice. Feedback is also
I used one that a friend brought along for us on ZS1RBN several years ago
and it still required a matching unit. I couldn't say how it performed
compared to the 5RV, but the figures look good on paper. As with most wire
antennas on dxpeditions, you rarely get the things at optimal height;
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
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
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,
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
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
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
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
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
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
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
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
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
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
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
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
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 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
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:
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
Treat a man as he appears to be, and you make him worse. But treat a man as
if he were what he potentially could be, and you make him what he should
be.
Johann Wolfgang von Goethe
73
David
G3UNA
Please don't hand a LID the keys to the kingdom, Kevin. If someone you
Some will eventually
Hector
Thanks for taking the time to do those recordings for us.
In a nutshell I would say that the noise reduction would greatly reduce my
listening fatigue. In both ssb and cw the resulting audio is softened ie
similar to reducing audio bandwidth.
I prefer this effect to simply reducing IF
Hector
I think a lot of folks would be interested in your findings and those of
others, so, you would do us all a favour if you could put those answers and
clips in a place we can all view: perhaps the Elecraft site?
David
G3UNA
Gary,Jim and Robin,I am pretty satisfied with 3.27 NR and I
Sundays
David
G3UNA
But if it were it would be on 80m, 3.630ish at 9am local.
Mike
Paul Fletcher wrote:
Currently the UK net isn't running due to propagation issues - should
start up again as the days shorten.
Regards,
Paul M1PAF
Eric Swartz - WA6HHQ, Elecraft wrote:
We're
Putting a loudspeaker in a unit that sits at the side is in my view a
retrograde step. I dare to suggest that most of us have reduced hearing in
some way and a loudspeaker should best be placed in line with our ears eg a
light weight speaker on a shelf at ear height. I would not stand such a
Well, you could knock me down with a feather ! (As mum used to say) I
cannot imagine sending for more than a few minutes like that. From your
description, the upper arm must be at a considerable angle to the body,
whereas the way I'm used to, the upper arm is vertical, ie in a 'natural' or
David
That's something I can't understand. How do you make the upper arm vertical
(in both views) with the elbow on the table? The table would have to be
very low or your chair very high and your stomach right up (and over) the
edge of the table. Do you sit square to the table or at an
That's very similar to what I had in mind.
Here is a link to my sketch, kindly hosted by David G4DMP
In my style, the pressure comes from the middle finger onto the disc and
that finger takes all of the bounce. I find bunching the fingers together
onto the key knob very tiring and I've added
The elbow should rest on the desk and the fingers on the key's knob.
I couldn't disagree more! I have always taught as I was taught that the key
is at the edge of the desk and no part of your body touches the desk, except
perhaps the other hand. The forearm should be horizontal, sit up
G3LDR made one as a roof rack many years ago; designed for 20m as I recall.
David
G3UNA
That's not really true. The DDRR is NOT a loop antenna. The DDRR is a very
short vertical with top loading contributed by a shorted transmission line
(formed by the horizontal loop and the ground
For a tripod I've used a small, inverted rotary washing line. These come
complete with quite a lot of very strong rope and a packing bag. Remove the
rope to use as guys for other, larger antenna systems. 3mm poly cord is
easily strong enough to guy a fishing pole using tent pegs. You might
I use mine with a 2 x 88ft doublet fed straight in and it works on all
bands.
David
G3UNA
- Original Message -
From: THOMAS BRERETON w2...@msn.com
To: Elecraft Reflector Elecraft@mailman.qth.net
Sent: Wednesday, July 15, 2009 11:44 PM
Subject: [Elecraft] The use of a doublet
I have
I thought the wire gauge was of little importance with parallel feeder,
since the energy flow is between the wires not in them. The insulation is
of more importance. You might want something stronger for mechanical
reasons.
I used that pink tv twin many years ago and learnt that the
Full marks for your investigation, Craig. Sounds like the winding tension
was set too high and the core bit through the enamel. That will be covered
by the Elecraft guarantee.
David
G3UNA
- Original Message -
From: Craig vk...@yahoo.com
To: elecraft@mailman.qth.net
Sent: Sunday,
Pink is good against the sky, discovered in WW2 for stealth aircraft.
David
G3UNA
- Original Message -
From: Fred Atchley hamkt...@att.net
To: Elecraft@mailman.qth.net
Sent: Thursday, June 18, 2009 5:34 PM
Subject: [Elecraft] Stealth antenna insulators
Greetings from the CCR capital
You are using a doublet and tuner: to what frequency is the tuner tuned? Do
you get the same response if the tuner is set differently?
Further to Joe's suggestion: I've heard of a strong local signal being
rectified in rusty guttering giving problems to a beam in just one
direction. Took
I think I used that about 30 years ago. If it's the same as I'm
remembering, it was an early attempt at a no-clean solder, ie it left very
little residue and did not require cleaning. It didn't work for me and I
sent it back. I think the flux wasn't aggressive enough for what we were
That would be of great benefit if you had an intermittent fault, such as a
fault in the antenna, particularly in a contest. Antenna faults are
probably the most common and an ERR message for high SWR sounds like a
really good idea.
David
G3UNA
- Original Message -
From: Jim Wiley
Have a look at QEX this month. W6WO shows an excellent method I have not
seen before. He feeds 10% in from the end and uses a simple 4:1
transformer. His capacitor is just a compression trimmer. It is coax fed
via a choke and runs to 100W.
Also look at AA5TB website for end feds. Kite
I wonder if there is a way of using a cheap 60kHz radio controlled clock
receiver to phase lock an 'ordinary' 10MHz crystal osc.
David
G3UNA
-
In a recent message, Craig vk...@yahoo.com wrote ...
I am tossing up between the LPRO rubidium and the Thunderbolt GPS
standard. The
That should not happen, that's not user-friendly at all. I trust this will
be addressed at a firmware update.
David
G3UNA
Subject: Re: [Elecraft] [K3] Help! Wierd bandswitching problem.
Be aware that roaming outside of the ham bands can cause them to get
mapped out. Then you have to go
Yes, Doug, I remember doing that, thanks for reminding me, it's very good
practice.
- Original Message -
From: GM0ELP douglas.maxw...@virgin.net
To: elecraft@mailman.qth.net
Sent: Saturday, May 09, 2009 12:17 AM
Subject: Re: [Elecraft] [OT] Suggested techniques for teaching CW?
1)
I agree with Alan and will add to ignore the advice I have seen in some
manuals that tell you not to start sending until you can receive at such and
such speed. In my experience, it's better to start sending straight away
with a tutor to correct the sending right from the start - you must not
Subject: Re: [Elecraft] OT: J and -31 mix toroids
You might wish to experiment with Steward mix 35 or 40 toroids. Mix 35
has a relative permeability of 5000 and mix 40 is 10,000. Fair-Rite's 31
material has a relative permeability of 1500.
Digikey carries several sizes of toroid cores in
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
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
I know this Professor, he has an assistant George Izard O'Veering
David
G3UNA
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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
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,
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:
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
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]
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
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;
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
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
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:
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,
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
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
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.
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
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. ;-)
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