Very interesting test and another use for the XG1!
Remember, the fat ladder line may be not canceling the currents, ie is not
as balanced as the more narrow line. Or maybe, the window narrow line is
just the better match to the tuner or it is the routing and the surrounding
influences.
-Stuart
K
Can the XG1 transmit into a 50 ohm resistor with short stiff wire leads to
couple, near the loop?
-Stuart
K5KVH
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Many pieces of equipment never get a comment from hams when they work as
advertised, or have so many advanced features that most hams never learn to
use them.
Thus, it is likely you hear the war stories of the problem equipment; rather
than of the successes.
In addition to my own MFJ 269, which h
Ten Tec has a great "T kit" for adjusting Antenna Tuners with out a signal
on the air, save the built in noise bridge. And it costs a LOT less than an
Antenna Analyzer from the commercial sources. The kit is one board, handful
of components and maybe one hour or less assembly. You listen for a n
My clubs, (two) have had 3 MFJ's. The only reason we had 3, was we
replaced a 259 with the 259 B for added features, and gave the still working
one away as a door prize. I have the Autek RF 1, and then later got the MFJ
269 to gain 440 band. All have worked well. There was an intermittent
disp
In a plated thru hole, you only have to solder one side, and the conduction
is made to the trace on other, as there is already solder in the hole.
Stuart
K5KVH
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Those having low band noise using indoor or attic antennas, might make a
large copper pipe loop for low noise receiving. It should be symmetric for
best effect.
-Stuart
K5KVH
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I will echo Ron's comment about the colors not being easily to sort out on
today's resistors. It is much better to use a DMM to be sure, and not trust
your eyes. If you want to pick resistors, do so with a high intensity light
and magnifier, and you will have a better chance of picking the correc
Hi Vic,
The diameter of the cosmetic pads I have found is smaller, (slightly) than
the Trimm type and Military Surplus phones I have used them on. I do wear
glasses 100 per cent of the time, and these pads have not been a problem.
They do not stick out forward of the ear enough to touch the glass
I have found that some ear buds fit better if you switch them to the other
ear, or turn them slightly so that the wire exits at an angle to the rear of
the head.
Maybe you can find a more comfortable position that way.
On another headphone note: From time to time, I report on using "Cosmetic
Sp
You can get quality 3M electrical tape at Home Depot/ Lowe's in various
colors to have something that does not look like "electrical tape". White
is available, orange, and many other colors.
You can use a wide tape, such as the clear vinyl tapes sold at home centers.
While Scotch type tapes will
Absolutely do not leave out the fillet. If you have a lead that sticks out
of a hole, you should have a fillet around it. That is a requirement of the
NASA soldering course of years ago, but has not changed as far as I see in
modern assemblies.
The flush plated thru hole is OK for solder bond to
Never trim precut to length leads such as ICs and relays, and resistor
packs, or crystals.
These have just enough extension thru the normal fillet of solder to not be
a problem, and to provide a place to clip on for troubleshooting probes.
Trimming short leads that were not designed to be trimmed
MARS has no better email than anyone else. The request for application
could have fallen in the bit bucket and not gotten to MARS; or they might
have been short staffed as they often are at HQ. MARS is pretty far down
the staffing priorities when it comes to the management of the program by
the m
Look up the Caplugs Co. on Google, and write for some samples of their
plugs, stating the sizes you need.
-Stuart
K5KVH
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These stepped drill bits are OK for the larger holes you might want to make
in thin metal. They are sold at Harbor Freight at import prices. See their
web pages.
72,
Stuart
K5KVH
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Bob,
Putting a large speaker magnet near any tuned circuit creates a large
magnetic field that can affect the tuned circuit. The effect of your large
speaker is common upon many radios. This even affects toroid circuits such
as those in the K2.
-Stuart
K5KVH
_
A simple brute force test would be to procure a simple mild steel box
sufficient to contain the K2 on all sides save the front panel. See if the
K2 in the box is still sensitive to nearby power fields. If not then
proceed to use less shielding in a series of tests:
Experiment with sheets of st
A soft steel cover might do the needed K2 shielding without the expense of
Mu Metal. There are also mu metal type foils that are self adhesive which
could glue to existing panels for increased magnetic field shielding.
Stuart
K5KVH
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Crimp tools run from about $50 for limited sets of dies at Mouser, to $200
for a do everything crimp tool from Pasternak Enterprises. I have two types
of Pasternak tools at work and although not cheap they last forever.
But check other distributors catalogs. Places like MCM might have a better
bu
I replied to George directly.
I have had trouble while mobile with a Radio Shack twist on BNC loosening on
my RG 58 coax antenna lead. Amphenol is carried by Mouser with no minimum
order, and has both crimp on and solder and clamp type BNCs.
They also have a twist on Amphenol, but have not exper
Charles,
I got a Minuteman vertical on close out at local ham store. It is still
available I think on web. (Google the name) it has pvc mast and base and is
for 20 and up. It has partly a telescoping whip top section. Worked great
last year on a QRP outing in so so propagation.
You could easi
Coax, will only exacerbate RF in the shack on an end fed long wire. You
will have radiation back down the outside of the shield and if the coax is a
critical fraction of a quarter wave at the shack end, it will radiate
there.
The unbalance in end feed with ladder line is only 10 per cent per L.
Static buildup depends on the Relative Humidity of the workplace as well.
Down in the South we do not have the problem someone in Phoenix may have
with dry air, for example.
Thus, in addition to discharging yourself, and bringing all work areas to
same voltage potential, you might consider monito
Make sure the contacts are seated all the way into the connectors. They
should have "clicked" when inserted.
Stuart
K5KVH
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Any time you have trouble loading a given balanced line, simply try adding 5
or 10 feet of line to the feeder and it should tune. You are moving the SWR
node along the line to give the tuner a more favorable voltage situation.
Stuart
K5KVH
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Elecraf
My understanding of the place to place silicon grease is NOT upon the
outside of the connector, but rather in the interface between male and
female connectors. The idea is to exclude moisture pooling on the insulator
between the center pin and the outer shell conductor.
However, if you over wrap
Tom is very correct. In 3M presentations on their specialty tape products,
they emphasized NOT yanking off the end of any tape; but to unroll as Tom
says, and let it "relax" then CUT the tape from the roll. That way, you
will not have loose ends hanging off the installation after a few weeks.
Thi
A properly terminated UHF or N connector can handle a kilowatt.
The ratings on the connectors vary by what voltage they can withstand.
Also, N connectors have seals for weather proofing. UHF have to be
weatherproofed externally, but when done so are perfectly reliable for
periods of 15 years or
One of the issues in the operation of an auto tuner, is that it has to
transmit enough power to be rectified by silicon diodes detecting and
operating in a linear manner. Also, you have to transmit enough power to
break down the oxides on connectors, RF switches, antenna connections and
anything e
Check locally for a chain store called
"Battery Tech" They have AGM batteries.
Stuart
K5KVH
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Another good resource is the Polyphasor web page for static protection and
grounding info.
-Stuart
K5KVH
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The tip is not grounded in an isolated tip iron. Allows one to control the
static grounding to include the operator, etc.
-Stuart
K5KVH
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Hank and the group,
One of the worst feeling headphone arrangements is any of the old hard
phones from military or 1950's ham days without cushions. The rubber
cushions that completely covered those types of phones used to be sold by
Allied Radio, and made by Trimm or one of the other headphone ou
Scott, never ship electronics with a battery installed unless you disconnect
one lead from the battery so that there is not way it can energize in
shipment. DO NOT RELY
ON ANY!! SWITCH! We have shipped equipment all over the world and seen it
accidentally turn itself on through vibration or switc
4500 Microfarad 150 Volts DC
-Stuart
K5KVH
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Check your local Home Depot or Lowe's home centers and hardware stores.
They have had good buys on brand name 3 1/2 digit meters of late.
Stuart
K5KVH
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Tom, please pass on my own condolences and I am sure all here on the list
join in as well.
-Stuart
K5KVH
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If your local humidity is kept above 50 per cent RH, you can grasp the pins
of any IC and gently squeeze them to close them to fit sockets. I usually
lay them sideways on the desk top and put pressure on them, holding the
plastic or ceramic body. This is the safest way.
-Stuart
K5KVH
__
Aluminum foil has very slight magnetic shielding, but there is commercial mu
metal foil that is very expensive but very good.
Thin sheet metal is cheaper and more readily found. Check it with a magnet
to see if it will work as magnetic shield. If magnet sticks it is steel or
ferrous (shield abil
Leigh, most of your coupling may be magnetic, if shielding did not reduce
the RFI.
You might want to experiment with steel shim stock or even tinplate from
cans.
The easiest fix is distance: Moving the rig away from magnetic and
electric field sources of transformers as you have found.
GL,
Stua
Steve, the Astron has the ratings to handle the K2 plus 100 watts. It also
has voltage regulator that should limit the current, so added breaker is
optional. It should be slightly larger than the current draw of the K2 plus
the amplifier, if used.
If you do not use the breaker, be sure to fuse
The cover on vs. off naturally changes overall circuit capacitance as well
as temperature. What you do is see how much you are off with cover on, and
adjust with cover off, in a direction to bring the circuit right on with the
cover on. In other words, you overcompensate the setting for the final
I notice the lack of familiarity with military time and Zulu time keeping
among our ARES members, and new hams during simulated emergency tests, or
public service events where any messaging is done. It is widespread since
the recission of the requirement to keep a log, I am afraid.
-Stuart
K5KVH
It used to be Standard Operating Procedure for all hams to keep their logs
in Zulu, (Greenwich) time, in that for working other countries or other time
zones, this is the only practical way to keep QSL card records.
I think it is remiss of current education in ham radio, that we do not
emphasize t
Some dust covers suitable for ham gear can be found, (Or was found) at
Office supply stores.
you might also check places like the Container Store chain.
-Stuart
K5KVH
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If one was not drawing sparks off the carpet, and the ambient humidity is
high, you probably have not zapped any chips. However, it is always good to
take precautions, in case the weather changes and drys out while you are
building.
-Stuart
K5KVH
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E
Earl,
Contact the companies that sell mu metal products and you can get a mu
metal foil or tape that should take care of the problem. That and some
distance from the offending linear should help. Maybe even doing the
MU Metal shield around the power transformer and choke of the linear
would be e
Congratulations Bob!
72
Stuart
K5KVH
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Help: h
ARRL requests you send in logs of both operators and guests, so
"participants" includes all who come to Field Day site.
Stuart
K5KVH
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The bottom line on placement of rigs to avoid hum for Elecraft, or any other
brand, is to place the transformers and switchers as far from the rigs as
possible within reason. Use twisted pair leads from DC supplies external to
the rigs, and shield them if possible.
Alternatively (and at great cos
Actually, Tom switching supplies may have a worse coupling effect since they
have an oscillator going at higher frequency than the power line, in
addition to power line 60 Hz.
And, even coupling of RF between Tuner and Radio can happen. At a Field Day
one time, a tuner was placed on a Yaesu trans
Fred,
The Ten Tec 1202 Power SWR meter works fine and accurately below 10 watts.
In fact I recal'd mine to 2 watts full scale.
See my review of same in Fall 1996 QRP ARCI Quarterly magazine.
72,
Stuart Rohre
K5KVH
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Ten Tec's 1202 Power and SWR meter kit is a best buy as it can be calibrated
for QRP and for QRO, (two scales). It also has two pickups, one for HF and
one for VHF/ UHF. Although spec'd only up to 2m, I found it useable for
nulls at 440 as well. You can easily change the calibration to suit your
It is very standard to use the back stay guy of the main mast for antenna on
a sail boat. It works very well, if the boat has an adequate ground plate
and bonding of the metal of the craft to radio ground. Metal towers used
with slopers are no different from a metal mast and a slanted back stay
a
All the hard work of balun design has been done in the balun kit offered by
The Wireman, Landrum S.C. (on web). I believe Amidon might also have Balun
kits and both fit the power range you want.
Typically, it is hard to get one balun to work 160m to 10m. See the Jerry
Sevick books, (Baluns and
Daniel,
You could forgo the core toroid entirely and use a small loop of smaller
coax than that of the antenna loop coax.
73,
Stuart
K5KVH
Google on "small loops" for a variety of feed versions.
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Paul,
Are you using an illuminated magnifier of at least 3X power? Also, do you
have a supplemental hand magnifier that you could place behind the
illuminated bench glass and have double the magnification? Makes it much
easier to see the boards and the notations.
Also, be sure to work in the ord
There are no user adjustments on the slug or pickup of the Bird that I am
aware of.
You could check it against some other known standard and construct a graph
paper of differences, but the Bird is good plus or minus 5 per cent about as
good as it gets for RF unless you go to high dollar calorimetr
The way to approach a problem that extends over several stages is to "half
split" it. That means you go half way into the circuit and monitor, for
normal operation. Then, if that works move half way later in the chain of
circuits and so on, until you narrow down the problem to one stage.
Usually,
Don, there is a sensitivity rating on the better quality earbuds packages.
Some of the Sony models are quite efficient among others. The cheap
unlisted specs models vary all over the place. Plus, the insulation gets
stiff on the Dollar store brands.
72,
Stuart
K5KVH
_
You can find the breaking strength vs. gauge of wire for copper in wire
tables from the manufacturers.
You can also find in some catalogs what the safe tension in pounds is, and
the weight should not exceed the working tension rating.
A wire is going to assume a natural sag of a centenary, and as
A foot note to Jim's wire comments: Watch out for fence wire that is
Aluminum clad steel. It will be less ductile than true aluminum and will
quickly rust out and fail where scratched or nicked.
Sadly, copper plated steel fence wire sold for electric fences, rusts out in
about a year in humid cl
An easy added protection for batteries is to use the appropriate zip lock
bag to add a protective membrane around the battery. Put holes to pass
battery leads but seal those with RTV silicone Rubber caulking compound.
-Stuart
K5KVH
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Actually, many manufacturers with multiple but similar models, often have
lapses of keeping everything updated. Things get busy with more than one
product to sell, accessories and parts to sell, and keeping up with parts
inventory for different designs. Not to mention, current production orders
t
Is the mike cable shield grounded to the radio mike connector shell and thus
the radio case?
It should be to preclude RF effects. It sounds like you have an unbalanced
or end fed antenna?
If that is a case a dipole/ doublet will be a better choice in that location
where you have some RF coupling b
You can roll off low end by decreasing the coupling capacitor in series with
the mike hot lead, or adding another to the mike alone to effectively do the
same.
You may need to change the gain of the mike preamp to optimize for the Heil
mike.
72,
Stuart
K5KVH
_
Sometimes reheating what "look" like good joints will fix a problem.
Are you sure the enamel got well removed from toroid leads before soldering
those leads?
GL,
Stuart
K5KVH
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There is a fix for this well known susceptable Wineguard amplified antenna.
Check out the ARRL web site, or Wineguard web site. Something was in QST I
believe also.
They have to fix or trade in the antenna with Wineguard. It is not possible
to fix at the ham station.
72,
Stuart
K5kVH
Pete, I have tried cyanoacrylate and when it heated it let go.
-Stuart
K5KVH
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Peter,
There are water clean fluxes that might answer your concern. I was thinking
of ones that dissipate with soldering heat, just a dot on land of the
component that was to be the "down side."
Stuart
K5KVH
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Why not get the spinner attachment for the standard Elecraft knob? Easy
addition as it glues on.
Stuart
K5KVH
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Yes, the Princess line of irons with replaceable tips can be used for SMT.
Stuart
K5KVH
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For manual SMT parts, 1206 is a workable size: 0.12 in. by 0.06 in.
Stuart
K5KVH
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Sandy,
What kind of soldering station do you have now?
How about $5 to put you in SMD capable soldering set up? Or maybe $10
outside, the cost of a proper tip if you have a heat controlled station now.
750 tips would do it, with the narrow end suited to 1206 pads.
73,
Stuart
K5KVH
_
SMT:
Actually, you can use your present soldering station if it is heat
controlled, and just get a smaller conical 750 degree tip for the Weller, or
Ungar lines. For home use, this works for 1206 components well enough. The
secret is to not apply heat too long, you are not soldering like you did
Yes,
I think we can do simple kits with 1206 parts with home hand tools and
possibly a hold down fixture home made. In fact, that would be a great
"kit", a set of SMT sized tools: Needle Nose pliers, light spring tweezer,
hold down device that would sit on desk and exert weight on a 1206 compone
Tom,
The local SCS modem expert is Lewis Thompson, W5IFQ here at ARL. email him
at the adr I will send, for info on the interfacing of the SCS. He has
successfully interfaced them to the little 5 watt Yaesu radio, I know. I
think it is pretty straightforward to interface the SCS to anything.
Hi,
Indeed, vibration in mobile transport creates triboelectricity, a charge
build up by friction of wires insulations against conductors. It could be
not the foam of the box, (which usually is grey or black indicating carbon
content) but the wiring inside the radio.
It is always good practice to
The Windom is not a cure all antenna, and indeed has a number of potential
problems. Its original version was a one band antenna, and modern uses of
similar antennas are like stuffing a model ship in a bottle--doing something
other than the physics show is the simplest antenna.
As an off center f
In other words, a revival of the "Rag Chewers Club" formerly available from
ARRL!
Very good Larry.
72,
Stuart
K5KVH
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The nice thing about the Ten Tec kit, is that it can be easily converted to
an "L" network tuner, if you switch the point where the pick up circuit
monitors current, and substitute a coax jack for the connection in one
original hole. That way, it can be converted back to artificial ground
service
Artificial ground tuners are series resonant circuits with a current sensing
metering circuit so that you can tune for maximum current in the series
circuit, an indication of optimum cancellation of the reactive ground lead,
(resonance).
Stuart
K5KVH
__
As others have noted two radials is a minimum. They should be used in
balanced numbers, pairs.
You also may benefit to have one radial in each direction you wish to work,
as that increases the signals from that direction when you have only one
radial in that direction. Pairing radials is suppose
Indeed, I agree that a horizontal antenna may be less noisy than the ground
mounted vertical.
You can try a simple wire dipole made of hook up wire at little expense to
check local noise situation and its orientation may make a big difference in
noise. The wire should not be parallel and at same
I agree with Phil, that a ground mounted vertical would pick up more
household noise than a horizontal dipole placed away from the house. See
the Cebik web site; www.cebik.com for antenna ideas that really work for
limited space.
72,
Stuart
K5KVH
___
Doug,
I guarantee that a whole box of moth balls will evict your furry attic
resident. However, it will permeate to the house, unless you can seal the
attic entry from the house with masking tape for a few days.
Be sure to find the entry point and be ready to screen it off as soon as the
furry fr
Nicolas, you will never go wrong with the simple dipole. With your
restricted space, you might have to bend a dipole to fit, but that should be
considered as opposed to a less effective antenna.
The 44 foot dipole plus the tuner hits a number of good DX bands. You can
bend it to fit your space.
Bob,
You might have another world round table. I did one in about 1991, New
Zealand, Australia, Alaska,
Chile, and Texas. SSB, 100 watts, wire K5KVH varient of the G5RV. (Flat
top was tee made up of 40 feet phase line plus the wire doublet).
73,
Stuart
K5KVH
___
The great Sunspot cycle peak in 1957 was the greatest ever recorded. For
some of us that were just coming into radio, it is hard to take cycles that
do not reach those dizzy heights.
For a young ham in 1957, sitting in a mobile with AM rig of about 50 watts,
talking to Australia in the middle of
If the average Sun Spot cycle can be called 11 years, and if 2002 was the
peak year, (somewhat muddied because of an apparent double peak this time);
then, from a peak to bottom should be 5 1/2 years. The bottom would be in
2007, and then another 5 1/2 years would bring the next peak around 2013.
Bands such as 80m and 160m have a lot of thunderstorm static in summer, and
are best in that regard , (lower noise) in winter. 40m is more of a
daytime band for shorter ranges, and skip lengthens out at night. If you
are trying to work in state, 80 and 160 m are best for that at night.
Bands ab
John,
It would be perfect for a mobile or to the field shelter rig. you would use
it with low doublets for NVIS propagation, (straight up).
NVIS is a very viable HF technique for around the state communications.
72,
Stuart
K5KVH
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You may have better results with a dipole antenna, or at least you will be
able to tell if it is the band.
A very low antenna as you describe, 12 ft., radiates mostly straight up and
is only good within your state except for exceptional propagation
conditions.
Try something from a tree to the pea
Doug,
Hams have to remember, even if using coax, with a tuner on the rig, the coax
is part of the antenna system and can radiate if a critical length. This is
obviously why the 30m band is hard to match. You have to make the antenna
plus coax of an electrical length the tuner can match.
GL and 7
Posters should disable their anti spam authentication if they want a direct
answer to their question.
A recent query resulted in my receiving a long complicated request for me to
go to web site to prove may answer was not from a machine. The web site
took too long to come up, so I canceled the re
Doug, the feedline length may be a problem on 30m.
Try adding or subtracting 5 or 10 feet to it.
72
Stuart
K5KVH
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Isn't the tone alternation of WWV between 400 and 600 Hz? It used to be.
-Stuart
K5KVH
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Ford trucks are notorious for having need of filters added to the in tank
fuel pump and possibly at the computer. There is a service bulletin, he may
have to go back a few years.
Ask dealer to contact the regional or National RFI people at Ford.
There is a company here who makes filters for Ford
Lee,
Maybe a latent bad solder joint? How about the speaker mounting screws
being overly tight?
A couple of the obvious things to check.
72, and GL,
Stuart
K5KVH
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