Howard, I received the core and the replacement choke earlier today.
I put the core on the 25' RG174 feedline right at the 9:1 UNUN and was
able to wind 10 turns. Then I connected a 33' counterpoise wire to the
output BNC using a hose clamp. This was just a quickie "temporary"
installation
I don't RV anymore but when I did my 5th wheel came with a charger made by Todd
Engineering, fortunately now out of business. It was simply awful in terms of
RFI. In the analog TV days the RV parked outside the garage would interfere
with low-band TV.
I replaced it with one made by a local c
How much noise from "warts" enters the antenna depends on the antenna. Close
and low antenna will pick up more and high and far will pick up less or
nothing. Also, balanced or with a good balun will pick up less than
unbalanced or where KX3 is a counterpoise.
Ignacy, NO9E
--
Sent from: htt
Just a note to comment on my experiences with RV 'converters'/battery
chargers. I've had to put an AC switch in the input line to disable the
"converters' noise. That solved the problem but sometimes an adjacent RV
will provide me with noise.
Gil
W7GIL
_
Thanks for address this thread Howard!
73
On Mon, Nov 20, 2017 at 1:35 AM, Howard Hoyt wrote:
> Hi Stan,
>
> One thing we have learned in supplying thousands of Kx33s to hams is the
> importance of minimizing or eliminating common-mode currents in the antenna
> system. The transverse mode RFI o
Noise can absolutely change with load. At light load the SMPS may enter a pulse
skipping mode. Some keep pulse width constant and vary switching frequency with
load to effectively change duty cycle. Most (all?) will continuously modulate
the switching frequency over a small range to spread out t
Up here in Alaska its not unusual to experience loss of commercial
power (often due to Inclement wx or avalanche). I've noted how quiet
my radio is when no one around us has power. Even running our 6500w
Honda invertor-generator its very quiet (which also tells my noise is
coming from neighbo
Hi Stan,
One thing we have learned in supplying thousands of Kx33s to hams is the
importance of minimizing or eliminating common-mode currents in the
antenna system. The transverse mode RFI output of the Kx33 is extremely
low and has never been the cause of noise to our customers, but if the
I have often wondered if the noise from a switching power supply would vary in
intensity or other characteristics as the load changes. For example, during
transmitting. In a single transmitter environment the user would probably not
notice but in a multi-transmitter or SO2R station one just mi
Josh,
You are quite correct. The usual CISPR standards limits for many SMPS
designs are typically set to 50dBuV across the HF spectrum, that translates
to roughly 5/9+17dB.
These standards are there to protect your old analog TV and commercial FM
radio being messed up not your local Ham operato
Most, if not all of those certifications are for safety, not emissions.
Further, I'm not at all convinced that compliance with FCC/CISPR standards
ensures no RFI to a ham station. Especially if your interests are weak signal,
EME, etc.
73,
Josh W6XU
Sent from my mobile device
> Just because
ally an Astron that Tentec did some work on. I think the one
Elecraft sells is quiet. Bit, you really need to investigate before
buying a switcher.
73,
Barry
K3NDM
-- Original Message --
From: "rich hurd WC3T"
To: "stan levandowski"
Cc: Elecraft@mailman.qth.net
Sent:
Before you throw the Samlex supply in the trash, have a look at
http://w4kaz.com/images/fp1023/samlex_1223_rfi_mods_from_zl2df.pdf
and several other mod schemes found on the web.
73 Jim Allen W6OGC
Sent from my iPad
__
Elecraft mailin
-
> From: "rich hurd WC3T"
> To: "stan levandowski"
> Cc: Elecraft@mailman.qth.net
> Sent: 11/19/2017 7:31:48 PM
> Subject: Re: [Elecraft] (OT) - Unplanned Discovery
>
> >Wow.
> >
> >Going to try that. Thanks for this great po
Hi Stan,
You're far from the only one, but I've been preaching this for many
years. Take a look at this piece that I wrote for National Contest
Journal a year or two ago.
http://k9yc.com/KillingReceiveNoise.pdf
An important first move is to search out and destroy every switching
power supp
Yeah, me too. I bought it because I thought it would be "super clean"
and really small. But its contribution to my problem was pretty much
unarguable: Plug it in and I hear noise. Unplug it and I don't hear
noise. The instructions that came with it specifically stated that the
Kx33 should
buying a switcher.
73,
Barry
K3NDM
-- Original Message --
From: "rich hurd WC3T"
To: "stan levandowski"
Cc: Elecraft@mailman.qth.net
Sent: 11/19/2017 7:31:48 PM
Subject: Re: [Elecraft] (OT) - Unplanned Discovery
Wow.
Going to try that. Thanks for this great
I'm really surprised you had an issue with the KX33 supply.
- JT
On Sun, Nov 19, 2017 at 7:31 PM, rich hurd WC3T wrote:
> Wow.
>
> Going to try that. Thanks for this great post.
>
> On Sun, Nov 19, 2017 at 19:23 stan levandowski wrote:
>
>> Most people on this Reflector are well educated and
Wow.
Going to try that. Thanks for this great post.
On Sun, Nov 19, 2017 at 19:23 stan levandowski wrote:
> Most people on this Reflector are well educated and intelligent.
> Apparently, I'm the exception because this one got by me. I'm only
> owning up to this in the hope that it might help
Great story, Stan. Now you know why the K3/K3S/KX2/KX3 all have data modes you
can use without a computer :)
73,
Wayne
N6KR
> On Nov 19, 2017, at 4:23 PM, stan levandowski wrote:
>
> Most people on this Reflector are well educated and intelligent. Apparently,
> I'm the exception because thi
Most people on this Reflector are well educated and intelligent.
Apparently, I'm the exception because this one got by me. I'm only
owning up to this in the hope that it might help someone else on the
Reflector.
For the last couple of years I've been bothered by a high background
noise lev
21 matches
Mail list logo
