This may or may not be a good idea. The impedance of RF chokes at multiple
frequencies varies greatly, as anyone who has built a high power tube amplifier
that covers 160-10 meters learns, sometimes the hard way. An open wire line
used on several bands may present very high voltages at some
On 9/27/2019 2:26 PM, Conrad PA5Y wrote:
What did make a difference was moving the radio away from sources of magnetic
fields such as monitors.
First, an important clarification -- is it HUM (pure 50 Hz) or BUZZ
(harmonics of 50 Hz)? You description sounds like hum. The important
thing is
That is a great idea unless you have my station... I have 4 computers, and tons
of other stuff. Tried to isolate the issue and decided on the opto isolator as
the simplest and time saving fix.
73,
Bill
K9YEQ
https://wrj-tech.com/
-Original Message-
From:
Conrad,
Can you turn off the other devices around your rig to see if any of them are
creating the problem?
I had a small portable electric heater that created hum in my K3S when
plugged into the same outlet.
Running the heater on an extension cord to an outlet across the room fixed
the problem.
To that end, I use a remote switch to remove direct connection and have all the
grounding to an extensive ground system to to all my ground side connectors to
attract any static to ground without shorting or providing any direct path to
my shack.
Bill
920-421-1172
Do you hear the human SSB also?
> On Sep 27, 2019, at 8:20 PM, Bill Johnson wrote:
>
You can buy an audio isolator cable on line to remove the ground loop issues.
Just search the topic for devices. I believe I used Amazon.
Bill
920-421-1172
From:
You can buy an audio isolator cable on line to remove the ground loop issues.
Just search the topic for devices. I believe I used Amazon.
Bill
920-421-1172
From: elecraft-boun...@mailman.qth.net on
behalf of Conrad PA5Y
Sent: Friday, September 27, 2019
I'm doing lots of QRP, but my joy of ham radio comes from the freedom of
choice.
As an example, on June 28th I worked ZL4TT on 20ms with QRP on my second
call, and five minutes later I heard ZL3IO, but I gave up QRPing after
some fruitless calls. I enjoyed both QSOs very much.
Just my 2
I believe Elecraft radios have an internal bleed but I still put a 470K
1/4 resistor in a PL-259 and use a coax tee on the back of the radio,
antenna on one arm, resistor on the other. I've been wary of chokes,
fearing creating a parasitic machine, but I've never seen that happen.
Precip
I've probably posted this here before, but I once had a 160m Inverted-V
at 70 feet that didn't have a DC ground. As a thunderstorm approached
(but was still several miles away) I reached down to short the coax end
in the shack and drew a heavy blue 2 inch long arc that traveled from
the end
I put up a new 6m antenna mainly for EME and I was so looking forward to using
my K3S. The RX is great, I run it in parallel with 2 other receivers and it
works very well on EME. However try as I might I cannot get rid of some quite
bad hum on the TX Audio. I am using USB and before you ask yes
It's from my head. I have a BVT - it's DC so the 4K is a DC claim. I
BVT cables used here in the shack as a fast way to ensure I don't have
some microscopic wire or filing or whatever down in a connector - stuff
like that is a nightmare to troubleshoot.
At one point I tried to use a PL259
For those with insulated verticals, the potential gradient is about 100
V/meter. That varies with humidity and altitude. But, you get the picture.
In dry climates like here in NM, this is a big deal for commercial broadcast
AM antennas. Even with the transmitter shut down, unless there is a
Few of us can guarantee dry air for our antenna connections. Where is this data
from?
For the question “Has anyone tested them?”, I expect that Amphenol tests to the
published specs. Those tests would be over the entire temperature range in the
data sheet. If you visit the data sheets I linked
My 80M CF Zepp has a feedline with a 2.5 mH RF choke from each side to the
station ground via a 2" wide flashing copper strap.
Never a problem with precipitation build up.
FWIW
73
Ken Kopp - K0PP
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On 9/27/2019 12:00 PM, Jeff Blaine wrote:
One thing I can say from personal experience is that if you have a tall
or long antenna, you definitely need a static bleed on that bad boy.
YES! After experiencing multiple shorts of Polyphaser arrestors on high
wires, I've switched to the arrestors
I'm going to partially disagree with Jim :)
I agree on good quality connectors, when you have them.
I can honestly say I have yet to have a none-Amphenol fail since I learned
to solder them in 1972.
I can also honestly say I have had a connector fail when I did not assembly
it correctly. This
I don't doubt the AMP connector is great but doubt this issue is due to
a connector.
One thing I can say from personal experience is that if you have a tall
or long antenna, you definitely need a static bleed on that bad boy.
Never really gave those stories much credence but a number of
Stuff like this annoys me greatly because it takes anecdotal information
and extrapolates it into a generalization. More power isn't the
solution to everything, but as a very extensive thread on one of the
other reflectors (TowerTalk or Contesting, I don't remember which)
recently pointed
On 9/27/2019 11:01 AM, j...@kk9a.com wrote:
If PL-259s are failing they are either poor quality connectors or there
are serious antenna issues causing excessive voltage.
YES! Only first quality connectors and adapters should be used.
I run legal limit to resonant antennas fed with 50 ohm and
Yes and without proper lightning protection or static build-up
prevention on a feedline, a nearby strike can induce 4KV+ on the antenna
and feedline. A flash-over will likely leave a carbon trace that will
be followed by a few 100 watts of RF. It only gets worst, not
better. On more than
PL259/SO239 BDV is around 4KV in dry air.
73/jeff/ac0c
alpha-charlie-zero-charlie
www.ac0c.com
On 9/27/19 1:01 PM, j...@kk9a.com wrote:
5000 watts is 500 volts rms with a perfect antenna system. I suspect
that PL-259 connectors really can withstand much more than 500 volts.
Has anyone tested
5000 watts is 500 volts rms with a perfect antenna system. I suspect
that PL-259 connectors really can withstand much more than 500 volts.
Has anyone tested them? My station has a mixture of UHF, N and DIN
connectors and all have worked perfectly for 1500 watts HF. If
PL-259s are failing
I didn't see anything on the Elecraft support page about a mod so I put
in a ticket a few days ago inquiring about my KPA500 Serial 1503. So
far, no answer.
Buck, k4ia
Honor Roll
8BDXCC
EasyWayHamBooks.com
On 9/27/2019 11:38 AM, Lynn W. Taylor, WB6UUT wrote:
Is this an official Elecraft
I have a K2/100 and an 88 ft low antenna fed with ladder-line. I run
FT-8 at 12 watts. I use 40, 30 and occasionally 20M. While I haven't
been on in a few months, earlier this year I was regularly working into
NA, SA, Europe and occasionally Africa.
72, 73,
Jim - W4BQP
On 9/27/2019 11:38
I posted a couple of queries about these adjustments, and didn’t get any
responses. So .. I just went ahead and aligned both the KX3 and PX3.
For what it’s worth, the phase/amplitude settings for opposite sideband null on
both the KX3 (except for FL1) and PX3 (everywhere) were
Is this an official Elecraft modification?
On 9/27/2019 2:58 AM, Petr, OK1RP/M0SIS wrote:
Roy,
The modification can be done as prevent action in order to avoid the loosing
the full power (12m) accompanied by burning smell or it can be the solution
for
your already ruined amplifier.
The
I have seen this guy on QRZ.COM with all kinds of strange philosophies. No
wonder he tries to challenge the average (100 W) and the above average (1
kW) hams this time.
Unlike him probably most of us know the correlation between power and signal
strength. It is simple physics. And for sure almost
This would be a lot easier with a public support forum, but I understand why
Elecraft might not want to take that on.
The mailing list is awesome, but it isn’t a very good database.
wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)
> On Sep 27, 2019, at 6:42 AM,
The correlations between passionate writing and useful content is close to
zero if not negative.
Due to poor conditions the bands are empty. What you could do with 5W and
some wire a few years ago now requires a KW with a beam. Many hams
especially in noisy neighborhoods with simple antennas
I just fixed a very similar problem with my station - I could run 100
watts to my Carolina Windom all day, but it failed instantly at 1500
watts. The problem turned out to be a very nice-looking
factory-installed PL-259 feeding the antenna. Looking inside revealed
carbon tracking, etc., so
>From the Amphenol data sheet, UHF connectors are rated for 500 V peak, so they
>are marginal for use at that power level. Type N connectors are rated at 1500
>V peak.
https://www.amphenolrf.com/connectors/uhf.html
https://www.amphenolrf.com/connectors/n-type.html
wunder
K6WRU
Walter Underwood
As found posted in another group. Stimulated thinking and as quoted.
73
Bob, K4TAX
"We need more power. I'm giving her all she's got, Captain! She cannae
take anymore.
I'm sure your Scottish ancestors are rolling in their graves right now, but in
our community of radio amateurs we have
Although the RMS voltage is pretty high. The peak voltage is higher
especially if SWR isn't 1:1 along the transmission line.
It could easily be above 1Kv and causing arcing.
73
jim ab3cv
On Fri, Sep 27, 2019 at 10:35 AM Michael Walker
wrote:
> Like others have said
>
> Even though your
Hi Al;
Most likely is the little Sub-In board is off a row of pins.
Or possibly the KXV3 has a missed pin.
Or one of the little black cube chokes (L1,2,&3) on the Sub-In board got
knocked off.
(I assume you have the KXV3B in "nor" and you have tapped 9 while in
that menu to toggle the "B" on.
Like others have said
Even though your analyzer says the antenna is ok, that is only one part.
It can still be part of the problem at 1500 watts and if memory serves me
well, that is about 275V (RMS) at 50 ohms.
Something could be breaking down at that voltage so a good visual
inspection would
I would request that any solution one finds for their KPA-1500 failing, be
posted on this forum, even if it's (typically like me) cockpit error.
We have seen many "My KPA-1500 died" listings.
These are obviously quite disconcerting to us potential buyers (again like
me).
Often, the original
Check for burn marks or carbon traces, both on the inside and outside, of the
SO-239 connectors. These may look good with the antenna analyzer but fail
under power.
I've also had PL-259's arc from center pin to shell on the inside. These
required removal/ disassembly of the coax in order to
Keep looking. They are out there. A friend of mine found a K1 antenna tuner on
the Elecraft site using an old URL. They actually had a kit available and sent
it to him. I just found a Pico Key in France.. worth the wait and the
price.
David J. Wilcox K8WPE’s iPad
> On Sep 27, 2019, at
If it also happens with a dummy load, and the antenna analyzers shows the same
graph as before for R, X, then it is likely one of the connectors between the
KPA1500 output and the antenna. The one such problem I had was old jumper I had
put in to add an SWR bridge/monitor. It looked okay, and
Was listed in a local group downsizing shack FS email.
John KN5L
On 9/27/19 5:10 AM, KE8LXD wrote:
> I am too looking for an unbuilt k1 kit for a while but don’t luck yet. May I
> ask where you found it?
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I am too looking for an unbuilt k1 kit for a while but don’t lick yet. May I
ask where you found it?
--
Sent from: http://elecraft.365791.n2.nabble.com/
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Ben,
according to your information the LPF T_R Switching rework Rev.E, Elecraft
Parts Kit: E850607 has been installed already... "In addition , under
warrantee, the T/R switch was updated ( Rev E?? ), and the 12M mod was
performed."
So your PA/LPF board should be now marked D10 near on the white
They are out there. Yesterday I purchased K1 #2573. Documentation
suggests vintage about late 2008, kit including errata F-8.
Has noise blanker option, but no ATU option. Anyone have an unbuilt ATU kit?
John KN5L
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Roy,
The modification can be done as prevent action in order to avoid the loosing
the full power (12m) accompanied by burning smell or it can be the solution
for
your already ruined amplifier.
The typical KPA500 misbehavior sounds like it is arcing inside and smells
the
classic something is
On 9/26/2019 10:26 PM, Peter Dougherty wrote:
Any idea where to start looking here?
And if it's a vertical, what about the radial system?
73, Jim K9YC
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On 9/26/2019 10:26 PM, Peter Dougherty wrote:
Any idea where to start looking here?
What is the antenna? The feedline? Is the antenna resonant? Is there a
serious common mode choke at the feedpoint? (See
http://k9yc.com/2018Cookbook.pdf ) Is it matched to the feedline at the
frequency (ies)
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