When I was a kid (a LONG time ago) I used to frequent a surplus house
here in Dallas and they had rows on monster capacitors lined up around
the walls, all with the terminals wired together. I learned the
importance when I started to unwire one (who knows why, I was a kid!)
and the clerk chewe
Eric, WB4VVI, (SK) reminded me of this that a cap can regain a charge from
being under fluorescent lighting. I try to keep some sort of jumper on my
larger capacitors and check them with the shorting probe. Incidentally, I
use the one that we had hanging on every corner of my shop when I was on
In a message dated 6/2/2006 19:22:18 PM Eastern Daylight Time,
[EMAIL PROTECTED] writes:
> One had a 10 uf, 15 kv oil cap
> that he charged, then shorted with a screwdriver. You probably have seen
> the fireworks that generated. It will give one pause around HV. He then
> waited about 20 mi
...somewhar in the shallow recess of my mind I recall one was to wire
jumpers accross the oil filed caps (meter terminals also) and this
("rebound") is probably the reason why...klc
- Original Message -
From: Donald Chester <[EMAIL PROTECTED]>
Date: Friday, June 2, 2006 5:27 pm
Subje
This is true Larry, that is why you check your cables and test equipment
before testing the rig.
73 Jim
W5JO
But thats dangerous in itself. The resistor could open and wala no ground
and worse you would never know it. >>
John I have a suspicion you do regular maintained on your rigs. Each year I
pull my high power rig out of the case and give it a visual, smell and
resistance check looking for signs of failure.
I have a GK 500A that I checked last year and it had a stain on the power
supply chassis that I had
At 16 - 17 years old, I got a scar on the side of my hand near my thumb
where I brushed against the end of the B&W KW plug in tank coil. The rig
ran a pair of 813s push pull and had 2500 volts from a BC610 plate XFMR and
a pair of 866s rectifiers. It was operational at the time so it had RF and
H
>Anyone who has been trained in safely handling firearms knows that
>all guns are to always be considered as always loaded. The only
>exception to that rule is when you open the weapon and see that it
>really isn't loaded. The same thing applies here. Anything inside a
>transmitter shou
Hey guys, we are talking about saving human life here. If you are afraid of
leaving of leaving a little burn mark on a cap or other component because a
bleeder didn't do
it's job or a meter didn't read zero, please reach right in and go play. The
burn mark on your skin will be much worse. Oh,
Flames coming...ZZZAP.
Broom Handle? wooden broom handle? Thats living on the Edge
thats what you use to play russian Roullette . Using that wooden stick
and you just may see
Jesus
I would never use a wooden Broom handle with a nail in it as
described below.
wood retains moisture
But thats dangerous in itself. The resistor could open and wala no
ground and worse you would never know it. All RCA rigs (and I worked
with klystrons at 20 to 32 kw and PS of 10 amp capable had direct
hard wire shorting sticks with flex welding cable like ground wire in
clear tubing easily i
This is also true Jim. This is why I use a VTVM with a 1 meg resistor in
the probe. I make up a special resistor probe divider network in addition
to this to do measurements of HV with. I occasionally check the voltmeters
on the front of the transmitter for calibration using this lash up. But it
From: [EMAIL PROTECTED]
I always thought you had to discharge though a high value resistance to
avoid
damaging arcs that would hurt the surface you were discharging through a
plasma
arc.
I do remember using a shorting stick in a job I had 20 years ago.
I don't know about a high resistanc
Okay.. I'm just thinking out loud again... what do you guys think about
these three options for the 1R2 output network:
Standard Pi network using two vacuum variables and a fixed inductor,
most likely 1L304 or 1L305. or
Pi configuration with using a roller inductor and two fixed capacito
I'm looking for at least three 5 - 25 pf ceramic trimmer caps. They
must be the pc mount type. Cash paid!
Thanks,
Rick/K5IZ
It's really bad when you start commenting on your own posts, but here
goes.
Anyone who has been trained in safely handling firearms knows that
all guns are to always be considered as always loaded. The only
exception to that rule is when you open the weapon and see that it
really isn't l
A resistor is considerably less reliable than a piece of heavy gauge
wire or braid connected directly to ground. You use the shorting
stick as a safeguard after everything is supposedly made safe. If
it's not really safe, then you live to tell the story about the big
bang and the blinding
Same principle as using a wrist strap with computers. A legitimate wrist
strap has resistance to limit the current flow. In the case of PC service
you want to prevent static discharge from going through delicate components.
If your wrist strap has no resistance it makes your body a direct path to
g
True, but should something be wrong with the meter following a disaster, it
might not show a charge. What an arc would be drawn if 3 KV remained
somewhere and you gave it a direct short.
I have always seen a high value resistor in these things.
73 Jim
W5JO
If you do things right,
Power D
In a message dated 6/2/2006 12:56:39 PM Eastern Daylight Time,
[EMAIL PROTECTED] writes:
> I still have the shorting stick that I used in the Air Force
I have exactly the same type.
John, W4AWM
I still have the shorting stick that I used in the Air Force. It has a
curved metal rod that you can hang over the high voltage lead, particularly,
the filter capacitors. The stick is made from hard phenolic about 1-1/2
feet long.
Dave, W3ST
Publisher of the Collins Journal
Secretary to the
For what it's worth, I am the proud owner of a BC-610F. It has many
fewer safety features than the much higher powered transmitters that
I've worked with professionally. Except for the exciter controls, I
never touch anything inside without shorting whatever it is to
ground. Even the exc
Yes. I would not want my life in the hands of an alligator, crocodile or
battery clip. Since you will always use it every time it is best to make it
permanent. That one time you don't could be you last time to EVER need it!
- Original Message -
From: "Rick Brashear" <[EMAIL PROTECTED]>
To:
On a BC-610 using a external VFO, just kill exicitation, ALL METERS fall to
ZERO, the B plus will go to 4000 VOLTS and if you have bypassed the
interlock and touch the link you will be GONE, Forget the meters! Trust the
stick! I know!
- Original Message -
From: "John E. Coleman (ARS WA5
Discharging is not the idea. If all is well it will NEVER discharge
anything. A nail with a good hooked ground strap in a broom handle is
perfect. This is to keep you from making a sudden trip to the hereafter
only. If it should ever actually be called on to work you will normally
holler out the na
Scott, was thinking about your Micamold transmitter the other day. I was at
Dayton and saw someone had bought one up there. Wonder how many of those
were built? The guy at the booth said that his buddy had been buying a bunch
of rare stuff there in the flea market, and he suggested to him that he
c
If you do things right,
Power Down,
Watch the HV meters fall down,
Then - Apply the shorting stick,
There won't be an arc.
WA5BXO, John
I always thought you had to discharge though a high value resistance to avoid
damaging arcs that would hurt the surface you were discharging through a plasma
arc.
I do remember using a shorting stick in a job I had 20 years ago.
Alan
The plastic cover on the braid sounds like a good idea, especially
considering how clumsy I have become in my old age.
Rick
W5OMR/Geoff wrote:
Actually, it was something made by John. He was good at what he did.
I forgot to mention, that the braid has a protective loose-fitting
heavy plast
Rick Brashear wrote:
You must have one of the original sticks, Geoff. That is too cool.
Actually, it was something made by John. He was good at what he did.
I forgot to mention, that the braid has a protective loose-fitting heavy
plastic cover that runs from the rod, to where it's connect
W5OMR/Geoff wrote:
Donald Sanders wrote:
3 foot 3/4 inch wooden dowel or broom stick. Put a rubber bicycle
handle bar
grip on one end. Use 1/2 to 1 inch braid 3 to 4 foot long with large
alligator(crocodile) clip on one end and the other end soldered to a
large
nail in the other end. That's
You must have one of the original sticks, Geoff. That is too cool.
73,
Rick
The one I have, was supplied by John/W5MEU(sk - RIP). It is a
phoenelic rod, about 2 feet long, with a threaded peice of metal that
screws into the phoenolic, has a flat-washer, one end of 1/2" wide,
stainless-ste
That ought to work. So, these "shorting sticks" were more or less
permanently attached to the cabinet?
Rick
Donald Sanders wrote:
3 foot 3/4 inch wooden dowel or broom stick. Put a rubber bicycle handle bar
grip on one end. Use 1/2 to 1 inch braid 3 to 4 foot long with large
alligator(crocod
When recently going through some of boxes of stuff I saw several rotary
stepped switches with Signal Corps
markings. These have a rotary selinoid about 1-1/2' by 1" high with a normal
looking centralab style 3 or so position switch section attached. I don't
remember the exact mechanism but be
From: W5OMR/Geoff <[EMAIL PROTECTED]>
Do all yall up there in yankee land know what "tumped" means? True
Southerners do.
That's a new one on me. But then I didn't know what grits were, and had
never tasted them until I joined the army.
One of my favourite expressions: "It would stink a
Hello Don,from Joe in Okla... I would like to purchase the:
9 unrelated coil forms. 2 Hammarlund 5-pin 1.5 inch forms. 3 Bud 5-pin 1.25
inch forms. 1 unknown 5-pin 1.5 inch form. 2 Bud 4-pin 1.25 inch forms. And
lastly, 1 ICA 6-pin 1.5 inch form. All except the unknown form are used,
with pins pre
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