Most 'ordinary' leds need about 20mA. Calculate a series resistor assuming
the led will have around 1.5 to 2V or so across it (it depends on colour).
You can find out what the actual voltage drop is after you've fitted the
resistor by putting your voltmeter across it.
If the supply to the
For a new rig to be so bad, he will presumably want it repaired. My first
thought would be to email Elecraft not Eham.
David
G3UNA
The reviewer (Solardx, no call sign) gives a very bad transmitter (SSB)
review. He claims lots of splatter and ineffective speech processing as
well as high
Here's another system:
http://radio.bhinstrumentation.co.uk/html/sound_file_demonstration.html
David
G3UNA
What you really need is a method of identifying the actual ssb speech
waveform, extracting the noise
from it leaving the signal in the clear. There is a company in Germany
that
Yes, Peter is still the reviewer and we have regular reviews of the latest
and greatest, but we don't know in advance.
David
G3UNA
Sherwood: done
ARRL: done
RadCom: ???
Does RadCom have a K3 for testing?
I dropped my sub some time ago...is Peter Hart still the reviewer?
de Doug KR2Q
Somebody once said Don't let patriotism get in the way of a good decision
or words that effect. I think they were talking about the Buy America
Act. Whatever happened to that?
My $ are going to Elecraft - a foreign company.
David
G3UNA
___
Yes, but, the antennas were some distance apart and they had very good
filters in their antennas. Don't try this at home... unless you have a
similar set up.
David
G3UNA
They said The outstanding receiver and transmitter characteristics
allowed us to run two positions simultaneously on
Does reducing bandwidth using the Hi and Lo cut invoke any roofing filters
as the appropriate bandwidth is reached?
David
G3UNA
___
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Subscriber
I fancy using the K3 on field days and mini-dxpeditions. I also fancy the
new line of small Asus computers which come with Linux installed. They have
no hard drive therefore run longer on a standard battery. It has a set of
drivers for Windoze applications should I wish to install at a later
Eric
What name or series do they go under, do you have a link?
Am I right in thinking AMP is now owned by Tyco?
David
G3UNA
Interesting. I started using the AMP connectors several months ago and
find
them to be superior to Anderson's. The contacts are beefier, they are
.035
thick while
Madelyn - Elecraft sales
[EMAIL PROTECTED] mailto:[EMAIL PROTECTED]
(831) 662-8345
is responding to me.
David
G3UNA
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From another list:
A neat article about a neat guy, Frederick Terman, can be found at,
http://www.investors.com/editorial/IBDArticles.asp?artsec=21issue=20080306
I believe the article should print to your screen.
73..de John/K4WJ
ex K8PXG 18 Jun 1959 to 11 Feb 1997
K8WJ 12 Feb 1997 to 08 Apr
Jerry
I agree. I'm getting decidedly twitchy (that's a technical word) about
staying up to date. I know it's not beyond me, but I might just miss
something crucial and then throw my teddy out of the pram when I do it
wrong.
If I print off the changes they can then be cut out and stuck on
Be good if some kind person could edit for the highlights :oD
David
G3UNA
http://www.sherweng.com/audio/Barc-Edited.mp3
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This makes perfect sense. The ears have a logarithmic response to sound
pressure and to frequency.
David
G3UNA
Another one that Fred K3ZO (many time winner of Dayton CW pileup
contests)
recently mentioned is using extremely low pitch for weak signals. Fred
said many commercial ops he
Eric
Absolutely fascinating and confirms many years of my own experience and
suspicions.
Am I right that the ear having shut down for a loud noise, takes a few ms to
recover? So, a static crash doesn't just cover the signal for the period of
the crash but also for a short period thereafter
I got a personal message the same day. No, not automated, personal,
referring to my order.
David
G3UNA
- Original Message -
From: Phil Wright [EMAIL PROTECTED]
To: elecraft@mailman.qth.net
Sent: Sunday, July 08, 2007 2:22 PM
Subject: [Elecraft] RE: We are not talking about a small
I'd like to add to Larry's note: the current capacities given in the table
indicate the maximum safe current for usual grade of insulation (better
insulation allows higher currents and temperatures). Single wires are
usually graded for their 'suspended in still air' rating and pairing up in a
It doesn't sound so different to 1N4148 if you can deduce the surface mount
version which will probably have similar capacitance. Vrrm a bit lower,
but...for an urgent situation I would just bend one up and try it.
David
G3UNA
- Original Message -
From: Robie Elms [EMAIL PROTECTED]
Ah, yes, thanks for the reminder. I think the 'torpedo' refers to
Australia. I got this tip from a QRP manual.
David
G3UNA
- Original Message -
From: Jeremiah McCarthy [EMAIL PROTECTED]
To: elecraft@mailman.qth.net
Sent: Friday, July 27, 2007 4:56 PM
Subject: [Elecraft] Wood bits
How does it compare to the BHI product?
http://www.bhinstrumentation.co.uk/
David
G3UNA
I have no pecuniary interest in either party
- Original Message -
From: Rob Locher W7GH [EMAIL PROTECTED]
To: Elecraft Discussion List elecraft@mailman.qth.net
Sent: Saturday, August 04, 2007 7:35
You could leave one at your remote location (antenna farm) for remote
control and one at home. The problem then arises: which goes where?
David
G3UNA
- Original Message -
From: Thom LaCosta [EMAIL PROTECTED]
To: John Huggins [EMAIL PROTECTED]
Cc: Elecraft@mailman.qth.net
Sent:
I've just re-read your question. So, the twin lead is not for the feeder,
it's for the arms of the doublet, or possibly both. I presume to widen the
frequency response. There are some interesting ideas for using ribbon as
antennas.
If it's the pale pink variety, the only thing I would
The SSM2165 is a good speech compressor and not expensive. I'm assuming it
will work on data? to bring up the level as required.
You can get a complete kit from www.box73.com DYC-817 (Code 734980)
External dynamic compressor kit for FT-817.
Or from OK1CDJ, but I can't find the link at
Be easier to find a K3 telephone box.
http://www.redphonebox.info/history.htm
David
G3UNA
- Original Message -
From: Bruce Prior [EMAIL PROTECTED]
To: elecraft@mailman.qth.net
Sent: Friday, September 07, 2007 3:45 AM
Subject: [Elecraft] K3 -- The Mountain
Will somebody carry the
that really a Tardis? :)
Bruce, NM5B
Santa Fe, NM
- Original Message -
From: David Cutter [EMAIL PROTECTED]
To: elecraft@mailman.qth.net
Sent: Friday, September 07, 2007 12:04 AM
Subject: Re: [Elecraft] K3 -- The Mountain
Be easier to find a K3 telephone box.
http
What an amazing amount of work you have put in to those units.
Congratulations and thanks for your inspiration.
David
G3UNA
- Original Message -
From: Benny Aumala [EMAIL PROTECTED]
To: Elecraft@mailman.qth.net
Sent: Friday, September 07, 2007 8:51 PM
Subject: [Elecraft] Balanced
Whatever happened to silent tuning? I know it's not entirely silent, but
monitoring across a dummy load with a bridge circuit means the auto
tuner/matcher can sniff the incoming rf and adjust for best match/tune and
then switch to full connection. On most HF bands, say 20m, there might be
I think we should send a few of the boys aroond ta sort ya oot, laddie
David
G3UNA
- Original Message -
From: Darwin, Keith [EMAIL PROTECTED]
To: Elecraft Discussion List elecraft@mailman.qth.net
Sent: Friday, September 14, 2007 2:25 PM
Subject: [Elecraft] OT: Bagpipes.
Bagpipes!
Occasionally I get repeat entries on my in-box and they keep re-filling no
matter how many times I delete them. I hadn't timed it to say it happens
weekly, but that sounds about right. I went to do my email by webmail
during those occasions and it did not re-fill from that source, but when
I have used a large, shallow aluminium tray similar to the cooker tray
mentioned and I place all components in the tray still within their a/s
bags. With my hands in the tray and the external connections to soldering
iron etc thro wrist strap etc, this is my defence against ESdischarge.
Tree
What were your filter settings? Sounds like a couple of hundred hertz.
I give 599 in contests just as an acknowledgement of reception, as I would
call it. Do dx stations prefer real reports or is 599 adequate? On the
rare occasions I have been dx, I preferred real reports, but it's a
and
humidity, it gets somewhat tiring and automated responses help a lot.
Thanks for info on the filter settings, I look forward to trying this.
David
G3UNA
- Original Message -
From: Tree [EMAIL PROTECTED]
To: David Cutter [EMAIL PROTECTED]
Cc: elecraft@mailman.qth.net
Sent: Thursday
Bob
Wonder if you (or anyone) has mixed the outputs from 2 or more noise
cancellers, perhaps using different antennas for each.
David
G3UNA
- Original Message -
From: Robert Tellefsen [EMAIL PROTECTED]
To: Mark Hampton [EMAIL PROTECTED]; Elecraft list
elecraft@mailman.qth.net
to null
more than one signal.
David
G3UNA
- Original Message -
From: Robert Tellefsen [EMAIL PROTECTED]
To: David Cutter [EMAIL PROTECTED]; Elecraft list
elecraft@mailman.qth.net
Sent: Saturday, September 22, 2007 3:44 PM
Subject: Re: [Elecraft] OT: Anyone use a noise canceller
My contest team uses N1MM contest logger and we can point and click on the
band map side bar where previously entered call signs are listed. I use
this frequently and I use the t/rx tuning dial for more search and pounce.
Learning N1MM was slow, but using it speeds me up a lot.
David
G3UNA
Perhaps what you are seeing is not so unusual: I've read that the IC706 had
a similar spike and I think it is one of the Alpha amps that shuts down
thinking it is an overload.
David
G3UNA
- Original Message -
From: Steef PA2A [EMAIL PROTECTED]
To: elecraft@mailman.qth.net
Sent:
An interesting parallel with home-build PCs, but the difference is that PC
boards are sold separately on the open market and in theory can be connected
with many other manufacturers' boards to make up a system; as such I would
interpret them as products within their own right. The K3 boards are
You only self-certify if you intend to place new goods onto the EEC market,
ie you are a manufacturer or importer.
David
G3UNA
- Original Message -
From: Julian G4ILO [EMAIL PROTECTED]
Couldn't we just self-certify it?
___
Elecraft
Ideally you want a spreader that you don't have to thread the wire thro:
imagine threading hundreds of feet or wire thro tiny holes in scores of
plastic parts.
I helped a friend make spreaders from the only plastic we had which was
stiff plastic hose pipe. We cut it into 4 (100mm) lengths
I heard of this problem of instability when a second psu upset the first one
due to very high values of input capacitance.
David
G3UNA
- Original Message -
From: Don Ehrlich [EMAIL PROTECTED]
To: Bill W5WVO [EMAIL PROTECTED]; [EMAIL PROTECTED];
elecraft@mailman.qth.net
Sent:
The reason for sidetone is that it makes talking much easier if you can hear
your own voice. Early telephones could easily be made to have no sidetone,
but it was found that the user found it difficult to speak properly, so some
of their voice was fed back just for this purpose. If you have
Getting above the noise is an expression that has worried me for a while. Some
modes I understand are perfectly happy in the noise such as PSK32 and spread
spectrum and would be well-suited to emergency/low power use where battery life
is crucial.
It's a complex subject I know, but I feel
Dear Dr
I'm sure I heard of a filter that peaked the audio passband to enhance the
s, c, ch etc but cannot remember where, perhaps it was in HR. Yes, I am
interested and if we can reduce that s+n/n ratio we can get more out of our
QRP, particularly in noisy conditions. I'm not hopeful,
I'll stick my neck out and say it was a standard handed down by the British
Post Office, generally known as a Post Office rack, now known by all kinds
of standards numbers.
David
G3UNA
- Original Message -
From: Tom Skinner [EMAIL PROTECTED]
To: elecraft@mailman.qth.net
Sent:
An excellent article. The first sentence says a lot for us.
The language of dots and dashes has been the lingua franca of amateur
radio, a vibrant community of technology buffs and hobbyists who have
provided a communications lifeline in emergencies and disasters.
David
G3UNA
-
Both ICE and NQN are good and NQN best but tricky (and expensive) to make
properly. However, what you really need are QRP filters which should be
very much smaller and lighter than either of the above. They both weigh a
lot more than your rigs. Same with coax filters. If you could convert
My ICE filters are model 419B which are on this site:
http://www.iceradioproducts.com/filtersrf.html
They are rated 200W, weigh 5 pounds and cost $288. They are meant for
multi-station contesting and close-in dxpedition stations and I think are
over the top for QRP weekenders. I cannot find
I notice some versions of switching supplies (probably for Eu consumption)
have an additional clamp-on ferrite on the output cable. Some supplies only
have terminal posts, but it is a good idea to put a clamp-on ferrite on the
cable right up to the terminal posts, ideally it should be in a
I advise against bending the wires of axial components against the component
body; this can lead to stress fractures at the joint depending how much
force you use. I use fine needle nose pliers to hold the component wire
near the body, then bend the wire sharp against the pliers. It's a
I use a very old hair drier (the quiet type before series wound motors
became popular). I set the heat and blower to low so that I get a warm,
gentle air stream over my work area. I've found that without the small
amount of added heat my hands become chilled, which is not just
uncomfortable
I have quite a few power supplies and I think they are all isolated from
ground, ie the metal enclosure is safety grounded to the house mains supply
(because they are Class 1 equipment in which the grounded chassis provides
the main barrier to shock hazard), but both low voltage output
For sheer inginuity, I just love the clothes line dipole in QST a few years
ago. If you have the facility to slide the feed point back and forth using
a full loop (folded dipole), perhaps with a remote controlled motor, one
feedline and one loop of wire will do a lot of multi-banding for you
I always advise using a non-resonant length for a multi-band doublet with
tuner combination. There's a magic figure: multiples of 44ft, 88ft... that
Cebik came up with which is a good compromise with impedance matching, ie
not horrendously high or low X and R. I notice no-one has mentioned
Your comment about spacing off the core is interesting: my Drake AMU has an
attached balun which is constructed with the wire wound on a former which
stands the turns off the core. The wire is 1mm diameter bare wire and does
not touch at any point. I have never seen this anywhere else. The
Dear Doc
Given the 5BTV and similar trap verticals have reduced performance on 80m
and nil on 160m, do you have a scheme for using the whole elevated system as
the antenna on these low bands, eg a tuning/switch box in the support pole?
David
G3UNA
- Original Message -
From: James
the pole from the top would be
workable and perhaps more efficient: I've seen this done with a beam and
tower arrangement in which the beam is isolated from the tower and an auto
tuner fitted between.
David
G3UNA
- Original Message -
From: James Duffey [EMAIL PROTECTED]
To: David Cutter
Brilliant video. Perhaps Elecraft could have a small library of these for
all those tricky little manoeuvres that would help builders.
David
G3UNA
- Original Message -
From: Ron D'Eau Claire [EMAIL PROTECTED]
To: 'Elecraft Reflector' elecraft@mailman.qth.net
Sent: Thursday, March
Yes, Fred, but you still have to tin the wire. I guess you save on solder
and get less fumes which is a consideration.
David
G3UNA
- Original Message -
From: Trail Fox [EMAIL PROTECTED]
To: elecraft@mailman.qth.net
Sent: Friday, March 09, 2007 1:48 PM
Subject: [Elecraft] Tinning
I have both models of the 259 and the AEA analyser. The latter is a
wonderful toy and great for filters, but not easy to use in the field on
antennas, I think because the data transfer rate is so slow and the screen
is not easy to see. The 259s are very good for tweeking antennas, though,
Hi cousin Bob
Another idea is a blast from the past: it was common to use a very thin
piece of rubber band inserted before the screw. It's a bit fiddly to get it
in but it worked well in old IF transformers.
David
G3UNA
- Original Message -
From: Bob Cutter [EMAIL PROTECTED]
To:
Good article in QEX on your system.
David
G3UNA
- Original Message -
From: Jack Smith [EMAIL PROTECTED]
To: Elecraft Discussion List elecraft@mailman.qth.net
Sent: Friday, March 23, 2007 6:49 PM
Subject: [Elecraft] K2 Integration with Z90/91 Digital Panadapter
I have released
Whatever happened to plastic knitting needles that we would shape?
David
G3UNA
- Original Message -
From: Geoffrey Mackenzie-Kennedy [EMAIL PROTECTED]
To: Ron D'Eau Claire [EMAIL PROTECTED]
Cc: Elecraft Discussion List elecraft@mailman.qth.net
Sent: Sunday, March 25, 2007 5:13 PM
It sounds like a malfunction in the start-up circuit. How is the psu
switched off? My guess is it is not an isolating switch on the supply
input, but some low power circuit that sends a signal to the start-up
circuit. This is not an area to be tackled lightly, as it is at mains
potential.
Hi Jack
You may well be right about the origination of conformal coating but it
was quickly taken up by other services who saw its benefits. I agree that
for MOST amateur situations it's probably over the top, but one of the
respondents to this thread has done it because he feels it
Can anyone identify why some PL259s do not fit some SO239s ? There is a
distinct difference in thread. I have never known Ns not to fit properly,
but there appear to be 2 types of PL/SO out there.
David
G3UNA
- Original Message -
From: Ron D'Eau Claire [EMAIL PROTECTED]
To:
I'd say that is cost effective design as long as the user is aware of the
limitations. If speech compression is used extensively, then the average
current will rise and the psu might fold back to protect itself.
Interesting idea, certainly good for cw. Lightweight is good for
dxpeditions.
I'm surprised to hear that. I understand it was the aircraft industry that
developed crimping as a more reliable way to make joints than soldering, at
least for regular wiring in aircraft.
Having seen a lot of bad soldering and assembly of PL259s done by my amateur
friends, I have a mind to
As long as you don't solder BEFORE crimping. I came across a vending
machine manufacturer that dip-soldered their wires before crimping which
negates the advantage of the gas-tight joint and is actually worse because
soft (lead) solder moves under pressure and would loosen in time.
David
And precisely how do you explain the mile-wide non-volatile smile on your
fizzog ? Ladies of the female species just KNOW when there's something
going on. Come clean from the start or you are TOAST.
David
G3UNA
- Original Message -
From: [EMAIL PROTECTED]
To:
On this side of the pond we know the K series as telephone boxes. The K3
was a smaller concrete version of the K2, 12000 made. :0)
http://www.redphonebox.info/history.htm
- Original Message -
From: [EMAIL PROTECTED]
To: elecraft@mailman.qth.net
Sent: Sunday, April 29, 2007 8:25
Is this viable?: Remove the KPA100 from a K2 and put it in its own box (as
has been done many times by lots of folk) but operate it from the K3. In
this way operate SO2R with the remainder of the K2 as the second rx for full
SO2R and save a little on the cost of the built-in PA for the K3.
Single Operator 2 Radios. In some contests the rules allow 2 radios to be
used by one operator. This enables the contester to listen to 2 bands at
once which is useful when one band is a bit slow and all you are doing is
sending CQ. You can then be monitoring another band, perhaps a
Off Topic but with so much expertise flying around I thought I would ask how
mechanical filters compare with crystal filters.
I think they were fairly low in frequency (455kHz?), so, not suitable in the
present discussion, but it would be good for our education at least.
David
G3UNA
A friend's coax-fed G5RV worked ok with his 990 (built-in matching unit).
No external tuner needed. It worked all bands 160 to 10m: on 160 I made
him a simple switch to short the coax and tune/match against ground. His
needs were modest - no dx, just local chit chat. It was sensitive to coax
I'll be glad when leds take over then we can power the whole house lighting
circuit with transformer isolated 12V and at last move towards an
international standard that is safe and cheap.
David
G3UNA
___
Elecraft mailing list
Post to:
Back in those days most of my friends did not even own an swr meter, we
tuned up by dipping and loading and worked out the power input to the PA
to meet the regulations.
In later life LV preferred to speak of the ASTU Antenna System Matching
Unit. I prefer to use MU for the box in the
BUT if you just want to get out for general rag-chewing, then the coax
version combined with a rig with built-in auto matching makes for a very
simple set-up.
For a local ham with bad arthritis, that's all he wanted, ie push-button
technology, no fiddling with knobs as he put it. I couldn't
What is the best advice to avoid this? Coax arrestors?
David
G3UNA
- Original Message -
From: F5UL [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Cc: elecraft@mailman.qth.net
Sent: Monday, May 28, 2007 8:17 AM
Subject: [Elecraft] K2, why change?
Hi Doug,
I justalso finished the CWWPX
I find QSK tiring, especially when the incoming audio is loud. The transmit
period I find restful to my ears. On the odd occasion I miss an over and
need a repeat, but not often.
David
G3UNA
- Original Message -
From: DOUGLAS ZWIEBEL [EMAIL PROTECTED]
To: elecraft@mailman.qth.net
From a purely manufacturing point of view, it's a lot easier to make a solid
state amplifier, particularly with surface mount parts and flow soldering on
a production line. Thousands can be made with high accuracy and
repeatability and that alone reduces a major cost centre which is the
There were one or two interesting signals there last night, one sounded
almost like spark! I prefer a wide setting for most of the time.
David
G3UNA
G4BP/P
- Original Message -
From: John GM4SLV [EMAIL PROTECTED]
To: elecraft@mailman.qth.net
Sent: Sunday, June 03, 2007 10:18 AM
Normal fuses are rated such that when 2.1 times their nominal current rating
is passed they will break within 30s. So, a normal 20A fuse will not break
until it is passing 40A and even then it will take a long time to go,
enough to fry the rig. The fuse is there to protect the cable when a
I am not an expert, but, a kit cannot be evaluated for safety and emc
because as it appears in the market it is just a collection of parts which
cannot be tested. The purpose of CE marking is to allow free marketing
across the EU using harmonised standards; it is not in itself an approval.
The first and last time I held solder in my teeth was many harvests ago and
I live to tell this tale: I got the shock of my life which threw me across
the room leaving me quivering wreck and might easily have killed me. I
later learned about leakage current. Appliances over here are allowed
The facilities available to SoftRockers are quite astonishing and will quite
literally revolutionise our radio experience and you can use practically any
radio. I've read that an FT1000 is being adapted using a SoftRock 40 with new
xtal. VK6VZ is spear-heading this fabulous idea. I shall be
Julian
I agree with your sentiment. My 'doublet' was nearly a loop, ie it followed
the beams around the loft. The ends were left open, about a foot apart.
David
G3UNA
- Original Message -
From: [EMAIL PROTECTED]
To: elecraft@mailman.qth.net
Sent: Saturday, October 28, 2006 12:22
Jeff
Answering your last question first:
for top band and 80m mainly (actually, it worked on all bands) I joined the
feeders together into one terminal of my Drake tuner and the other I took
thro some tv coax (shorted) back up thro the ceiling, out to the soffit
board and straight down to a
I had similar problems today with an 840 in the contest.
David
G3UNA
- Original Message -
From: KT5X [EMAIL PROTECTED]
To: elecraft@mailman.qth.net
Sent: Sunday, October 29, 2006 2:32 AM
Subject: [Elecraft] N1MM Contest Logger VFO B issue
Yes, I noticed the same problem (and more)
In the marine set I went to sea with, 2 x 10k 25W carbon resistors in
parallel were fitted as an antenna bleed. This was on the MF/HF set: all
valves in those days. Antenna was end fed inverted L and the tx was about
150W.
David
G3UNA
- Original Message -
From: Robert Johansen
in
the RF bridge etc.
73,
Bob Johansen WB2SRF
On Sun, 12 Nov 2006 15:37:26 - David Cutter [EMAIL PROTECTED]
writes:
In the marine set I went to sea with, 2 x 10k 25W carbon resistors
in
parallel were fitted as an antenna bleed. This was on the MF/HF
set: all
valves in those days. Antenna
Has anyone adapted the K2 with an audio synthesiser? ie to announce band/mode
etc? Not the computer K2 Voice system, but a module I can fit internally
preferably. Are there any little programmable voice synthesisers about?
73 to all
David
G3UNA
I'm going around my contest station changing all the 239s for Ns.
David
G3UNA
- Original Message -
From: Gregg R. Lengling [EMAIL PROTECTED]
To: [EMAIL PROTECTED]; elecraft@mailman.qth.net
Sent: Monday, November 20, 2006 7:53 PM
Subject: RE: [Elecraft] k2 antenna connector
Not on the
I have used an Antex plumber's electric soldering iron which grips the
barrel all the way around for very fast heating; the very large tips (grips)
hold a massive amount of heat. The newer type with the top hat sleeve
inserted up inside the braid are quicker and easier and more certain,
The single raised radial also puts a few dB in that direction.
David
G3UNA
- Original Message -
From: Craig D. Smith [EMAIL PROTECTED]
To: Elecraft@mailman.qth.net
Sent: Thursday, November 23, 2006 1:34 PM
Subject: RE: [Elecraft] DX on 40m
Congratulations, Ron, on the South Cook
One thing I have not seen mentioned so far is the probes that you will need
to use. The scope's 1:1 normal probe will place a fairly large capacitance
across the device you are measuring and the amount will depend on the
quality of the probe you buy. If the signals you intend to measure are
connections, but that's mostly upgraded to
USB these days.
Have fun
David
G3UNA
- Original Message -
From: [EMAIL PROTECTED]
To: David Cutter [EMAIL PROTECTED]; Elecraft
elecraft@mailman.qth.net
Sent: Monday, November 27, 2006 5:21 PM
Subject: Re: [Elecraft] Oscilloscope alternatives
If there's one thing the Navy do not like, it's being shown up by another
branch. I heard tell of a newbie secretary who typed up some minutes and
put the attendees in alphabetical order. The Navy refused to attend the
next meeting until they were at the top - it's probably an 'urban legend'
Also finger grills and panel slots create turbulence which can drastically
reduce flow. For a common or garden 'computer' type of fan, a dust filter
can practically stop air flow all together, so, choose with care.
David
G3UNA
- Original Message -
From: Geoffrey Mackenzie-Kennedy
A designer will take into account which parts he wants to cool first. For
instance, if a sensitive component (vfo?) is on the cool side of the draught
then it will not be affected by a hot component down stream. However, if
the direction is reversed you could be creating a problem that wasn't
A colleague used to work for a tv manufacturer and they had a recurrent problem
with tvs going sick after a few months. It was traced to solder joints not
made correctly. Their soldering technique was satisfactory and the component
manufacturers came over from Japan to investigate why the
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