,
while holding the PL259 with the other hand. It was like touching the tip
of a spark plug.
- Original Message -
From: stan levandowski sjl...@optonline.net
Cc: elecraft@mailman.qth.net
Sent: Sunday, September 09, 2012 9:04 AM
Subject: Re: [Elecraft] Antenna static charge precautions - any
Mike,
A point worth mentioning I believe, is that a static drain resistor placed
inside a transceiver/ transmitter/ receiver as you suggest will provide some
protection against static should an external static drain resistor fail into
an open condition. Certainly good practice IMHO.
73,
-Original Message-
From: zen...@netspace.net.au
Subject: [Elecraft] Antenna static charge precautions - any tips?
...I've just re-hung my 80m horizontal loop. With so much wire in the
air, I'm reviewing my static charge risks and how to reduce them...
It looks to me like a loop
...@mailman.qth.net] on
behalf of Fred Jensen [k6...@foothill.net]
Sent: Saturday, September 08, 2012 10:16 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Antenna static charge precautions - any tips?
Don is totally right. But, cutting to the chase, put a 100K resistor
across your coax before it gets
Short but interesting demo of antenna static discharge - good motivation
- http://www.youtube.com/watch?v=hlSpZ-ffacA - (BTW, I've heard the
FT-817 has a 22K resistor installed but don't know that for sure)
On Sun, Sep 9, 2012 at 9:28 AM, hawley, charles j jr wrote:
Which begs the
j jr
Sent: Sunday, September 09, 2012 6:29 AM
To: k6...@foothill.net; elecraft@mailman.qth.net
Subject: Re: [Elecraft] Antenna static charge precautions - any tips?
Which begs the question...why isn't a 100K across the antenna jack in the
original design?
BTW, I use a choke across the antenna leads
-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of hawley, charles j jr
Sent: Sunday, September 09, 2012 6:29 AM
To: k6...@foothill.net; elecraft@mailman.qth.net
Subject: Re: [Elecraft] Antenna static charge precautions - any tips
Ron wrote:
Many antenna systems do not require this protection. They are shunt fed
which provides a direct-current short across the feed line at all times.
Chokes may work fine, but all chokes have some parasitic capacitance across
the windings which means they have a series resonances
Check the K3 schematics - there *is* a static bleed resistor at each
antenna input, including the KXV3 Rx Ant In jack.
Gas discharge tubes are also present in the KANT3, KAT3 and KRX3.
Bob NW8L
Which begs the question...why isn't a 100K across the antenna jack in the
original design?
BTW, I use
09, 2012 9:04 AM
To: Ron D'Eau Claire
Cc: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Antenna static charge precautions - any tips?
I'll keep an eye on it :)
Sent from my iPhone
On Sep 9, 2012, at 10:53 AM, Ron D'Eau Claire r...@cobi.biz wrote:
Many antenna systems do not require
Bob wrote:
Check the K3 schematics - there *is* a static bleed resistor at each
antenna input, including the KXV3 Rx Ant In jack.
What about the KX3? There are no published schematics yet, AFAIK.
73,
Mike / KK5F
__
Elecraft mailing
Why be concerned about whether or not each and every transceiver adds a
static bleed resistor across the antenna, just bite the bullet and add
one to each feedline coming into the shack and forget the
tooth-mashing that comes about wondering where it should be done. I
for one feel that it is
So, the 22k - 100k carbon resistor is not needed and therefore would be
redundant?
Phil
Santa Fe
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Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post:
Why be concerned about whether or not each and every transceiver adds a
static bleed resistor across the antenna...
Well...perhaps because the addition of an internal high-ohm static bleed
resistor at *any* radio set's antenna connection is trivial yet very good
engineering practice that has
What Don was trying to express was that if you simply add a resistor to your
own antenna, you don't need to worry/wonder about whether or not it is
included in a particular transceiver.
It may be good engineering practice to add it to a transceiver one is
designing. However, if you do it
Phil,
That would be true only under certain conditions
What conditions are you referring to? Your post was void of any conditions.
73,
Don W3FPR
On 9/9/2012 4:02 PM, Phil Townsend wrote:
So, the 22k - 100k carbon resistor is not needed and therefore would be
redundant?
Phil
Santa Fe
I was glad to see my K3 had the 560k resistors in place.
I checked the KX1 and don't see any installed...
Sooo... looks like its a good idea to place them somewhere in the feedline
after the antenna switcher...or maybe within the the antenna switcher box.
Really glad this subject came up cause
Keep in mind that the resistors (or a choke) only provide PARTIAL
protection. If you connect an antenna to the rig that has accumulated a
significant voltage - which can happen in a couple of minutes in dry windy
conditions, in a rainfall, or even during a snowfall, you'll still damage
the rig
It seems to me that with an antenna switch that doesn't short
the unselected antennas by default, like the DX Engineering
RR8A-HP remote antenna switch, it might be advisable to either
set the switch up to short the unselected antennas or add a
resistor across them individually. Otherwise when
Which reminds me: I have ICE lightning protectors on my feedlines where they
come into the
shack. These have a built-in choke across the side that goes to the antenna,
which drains
static charges. See
http://www.arraysolutions.com/Products/surge_arrestorAS-3xx.htm
The only disadvantage of
Hi all;
From: Bob Cunnings bob.cunni...@gmail.com
Check the K3 schematics - there *is* a static bleed resistor at each
antenna input, including the KXV3 Rx Ant In jack.
Gas discharge tubes are also present in the KANT3, KAT3 and KRX3.
Bob NW8L
I certainly
Unusual to see that as an issue withought using an amplifier, however the
high antenna feedpoint impedance on such setups produce a high voltage at
that point, despite the atu proving a 50 ohm impedance match to the
transceiver.
Baluns rated at 3-5 KW are so only at 1:1 swr. When swr raises to
K2VCO k2vco@gmail.com
Subject: Re: [Elecraft] Antenna static charge precautions - any tips?
To: elecraft@mailman.qth.net
Date: Sunday, September 9, 2012, 3:59 PM
Which reminds me: I have ICE lightning protectors on my feedlines where they
come into the
shack. These have a built-in choke
Scott,
You will have to do the math to figure out the actual voltage and
current of the components. The formula is the standard I squared R
power losses, or the IR voltage or some other aspect of ohms law. Gas
discharge tubes will conduct when the peak voltage exceeds its rating.
If your
From: Don Wilhelm w3...@embarqmail.com
I do not understand your concern for the K3. The KAT3 was working to
produce a low SWR (and a 50 ohm load) for the K3, so that condition was
apparently satisfied. The high voltage condition existed only at the
Unusual to see that as an issue without using an amplifier, however the
high antenna feedpoint impedance on such setups produce a high voltage at
that point, despite the atu proving a 50 ohm impedance match to the
transceiver.
I agree, and since I am only
Hi, all!
10 years ago (in 2001) YL and myself changed our home location and our place
of choice is very thunderstorm addictive!!!
So, after burning an Drake TR7, I installed, on the antenna line a box with
a big relay, turning on with whatecer 12 V PS I turned on
swithching between a chock (2.5
Hello Group,
I've just re-hung my 80m horizontal loop. With so much wire in the
air, I'm reviewing my static charge risks and how to reduce them to
protect my K3. I'm in the mountains - things get bumpy and charged
up here. I once lost the wattmeter diodes in my K2/100 to a static
event, so I'm
John,
Put a resistor across each feedline is my advice. A value from 22k (I
like 3 watts for legal limit rating) to 100k will discharge the static.
A DC path across the feedline is a very good protection against antenna
static damage to your rig - the path to ground is not as essential as
Thanks, Don. I have a homebrew doublet with a gas discharge center
insulator and I have been under the (apparently incorrect) assumption
that I've been well protected from static buildup. I've also got a
coaxial switch which is dialed into the dummy load when not in use.
Guess, I better go
On Sat, Sep 8, 2012 at 7:07 PM, stan levandowski sjl...@optonline.netwrote:
Guess, I better go out and buy a 22K resistor now and fnish the job ;)
I use a 3 megohm resistor. Since the purpose is to bleed off static
buildup, high resistance is fine. Depending on your antenna, frequency,
feeder
OK a bit of explanation is in order. The K2 (and K3 as well as the K1)
control power based on measuring the actual output power and adjusting
the drive to provide the requested power level. That means a device
capable of measuring the RF output is necessary.
Well, that is the wattmeter in the
Don is totally right. But, cutting to the chase, put a 100K resistor
across your coax before it gets to the receiver. Easy, no RX mods, just
put a 100K resistor ... 1/2W will do fine ... into a PL259. Put a UHF
T-connector on your radio, put the antenna on one leg, put your
resistive PL259
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