Shortwave transmitters tend to live very long lives.
Sent from my iPhone
> On Dec 19, 2018, at 19:13, Phil Kane wrote:
>
>> On 12/19/2018 3:25 PM, W2xj wrote:
>>
>> must have been an old tx. The ones dating back around 60 years had
>> front panel cranks and newer models did changes automatica
On 12/19/2018 3:25 PM, W2xj wrote:
> must have been an old tx. The ones dating back around 60 years had
> front panel cranks and newer models did changes automatically.
He actually had to go into the cage and change taps on coils. I don't
remember the age/model of the TX but it was in service in
must have been an old tx. The ones dating back around 60 years had front panel
cranks and newer models did changes automatically.
Sent from my iPad
> On Dec 19, 2018, at 2:40 PM, Phil Kane wrote:
>
>> On 12/18/2018 10:35 AM, W2xj wrote:
>>
>> I was referring to ham tuners but shortwave broad
but phasors are not matching networks. theoretically they are 50 ohms in and 50
ohms out although in reality that is not quite the case. in any rate the high
power sites i have built has the phasor at the highest power tower. at some
sites i put the phasor in its own building at the center of t
On 12/18/2018 10:35 AM, W2xj wrote:
> I was referring to ham tuners but shortwave broadcast stations QSY
> with hundreds of kilowatts many times a day.
And a former friend who was one of th station operators at KGEI (SW
station now defunct) had the record time for changing bands on the 100
KW TX.
On 12/17/2018 7:45 PM, W2xj wrote:
> Coming from the broadcast side, especially AM broadcasting, I never
> considered resonance particularly important. Really it’s just the
> transmitter that cares. We always put matching at the antenna but in
> ham radio we usually have tuners at or in the TX.
A
On 12/17/2018 2:43 PM, W2xj wrote:
> Remember this IS a hobby and to each their own. As an engineer, I do
> model and design what I use. I hate the “by guess and by golly”
> approach. Everything I do is carefully planned in advance and is a
> part of my enjoyment of the hobby but YMMV.
I too am a
On 12/17/2018 11:03 AM, Fred Jensen wrote:
> Larson E. Rapp is using an alias now?
Haven't seen that author attribution for decades. Shows my age. :)
73 de K2ASP - Phil Kane
Elecraft K2/100 s/n 5402
>From a Clearing in the Silicon Forest
Beaverton (Washington County) Oregon
To be fair, solid state PAs are far less forgiving about match than were tubes.
This is completely due to broadband design. This can be solved by including an
ATU as is done with a number of Elecraft products either as an option or a
feature. In the end it is about what it takes to keep the PA h
Skip,
That is "telling it like it was".
If you want to go back to those "good old days", build yourself a link
coupled tuner. It will likely use plug-in coils and perhaps a swinging
link.
Then you can tune it just like you did on your old transmitter/amplifier
- except you do not have to "
This is probably the big reason.
When I got my ticket, things were pretty much coax, but I vaguely
remember something about open wire (ladder line) being less lossy when
things were mismatched.
73 -- Lynn
On 12/18/2018 5:00 PM, Fred Jensen wrote:
Granted, today's TX are comfortable with 50 o
Yep, the term was known when I became KN6DGW in 1953, but somehow no one
cared. Standing waves were sort of benign, you ran your transmission
line [often 300 ohm open-wire, or TV twinlead] to the 2 or 3 turn link
and adjusted it inwards until your TX was "loaded" to rated input
power. Standin
A few comments. 180 degree radiators are almost always avoided as at high power
the base can literally be explosive. Theoretically 225 degrees would yield the
most radiation towards the horizon but presents two problems. The first (for
class A stations) is the secondary lobe that causes self int
T. A. Gadwa, “Standing Waves on Transmission Lines”, QST, December 1942, pp.
17-21.
Wes N7WS
On 12/18/2018 3:43 PM, Fred Jensen wrote:
[snip]
The obsession with VSWR in ham radio is a bit surprising. I can't really
remember when the term became common, or when I first saw a VSWR bridge, bu
Right, SWR (or VSWR = same thing) has nothing to do with the antenna
itself - it is all related to the feedline.
It does have a lot to do with the ability to match the feedline to the
transceiver which normally likes a 50 ohm load or something close - but
then an ATU can take care of that situ
Actually most are open wire feeders and have no networks.
Sent from my iPad
> On Dec 18, 2018, at 11:27 AM, Bob McGraw K4TAX wrote:
>
> But usually they have only 2 or 3 switched frequencies. They also switch
> directions, sometimes on different frequencies. All of these conditions are
> kn
My mini-dissertation strictly applies to Class A [so-called "Clear
Channel"] stations only, who almost universally use single,
omni-directional verticals since they are not required to protect any
other stations at night. There were a few Class A's on the coasts that
did use directional phased
On 12/18/2018 11:54 AM, Fred Jensen wrote:
Indeed. AM broadcast vertical antennas are rarely 90 or 180 degrees,
especially if they are a Class A station. I think both KFI and KNX in
Los Angeles have 195 deg verticals. The design goal is to maximize
field strength in the service area, accompli
Interesting, I had an analog computer course exercise at the U of I Urbana when
we had two verticals separated and phased to define the coverage pattern. I
don’t remember the length of them. It’d be interesting to recall what it was.
Chuck
KE9UW
Sent from my iPhone, cjack
> On Dec 18, 2018,
AM
Subject: Re: [Elecraft] wire for random wire antenna using kx3
Indeed. AM broadcast vertical antennas are rarely 90 or 180 degrees,
especially if they are a Class A station. I think both KFI and KNX in
Los Angeles have 195 deg verticals. The design goal is to maximize
field strength in
Indeed. AM broadcast vertical antennas are rarely 90 or 180 degrees,
especially if they are a Class A station. I think both KFI and KNX in
Los Angeles have 195 deg verticals. The design goal is to maximize
field strength in the service area, accomplished by adjusting the height
of the curren
But usually they have only 2 or 3 switched frequencies. They also switch
directions, sometimes on different frequencies. All of these conditions are
known and networks are pre set for the required combination.
Bob, K4TAX
Sent from my iPhone
> On Dec 18, 2018, at 12:35 PM, W2xj wrote:
>
>
I always put mine down about 3 feet. Avoids both farmers and copper thieves.
Sent from my iPad
> On Dec 18, 2018, at 10:21 AM, Bob McGraw K4TAX wrote:
>
> When the farmer plows up the ground field in the Spring! Gr
>
> 73
>
> Bob, K4TAX
>
>
>> On 12/18/2018 12:00 PM, Lynn W. Taylor, W
I was referring to ham tuners but shortwave broadcast stations QSY with
hundreds of kilowatts many times a day.
Sent from my iPad
> On Dec 18, 2018, at 10:00 AM, Lynn W. Taylor, WB6UUT
> wrote:
>
> How often does the match change at a well-engineered broadcast station?
>
>> On 12/18/2018 9:
When the farmer plows up the ground field in the Spring! Gr
73
Bob, K4TAX
On 12/18/2018 12:00 PM, Lynn W. Taylor, WB6UUT wrote:
How often does the match change at a well-engineered broadcast station?
On 12/18/2018 9:47 AM, W2xj wrote:
That’s why we have adjustable antenna tuners. Same
How often does the match change at a well-engineered broadcast station?
On 12/18/2018 9:47 AM, W2xj wrote:
That’s why we have adjustable antenna tuners. Same concept.
Sent from my iPhone
On Dec 18, 2018, at 09:27, Lynn W. Taylor, WB6UUT
wrote:
Broadcast stations rarely QSY.
__
That’s why we have adjustable antenna tuners. Same concept.
Sent from my iPhone
> On Dec 18, 2018, at 09:27, Lynn W. Taylor, WB6UUT
> wrote:
>
> Broadcast stations rarely QSY.
>
>> On 12/17/2018 7:45 PM, W2xj wrote:
>> Coming from the broadcast side, especially AM broadcasting, I never
>> c
Broadcast stations rarely QSY.
On 12/17/2018 7:45 PM, W2xj wrote:
Coming from the broadcast side, especially AM broadcasting, I never considered
resonance particularly important. Really it’s just the transmitter that cares.
We always put matching at the antenna but in ham radio we usually have
Telephone drop wire makes a good antenna. Connect both wires for a fat
dipole. But, be careful. The phone company uses a device on the end
that attaches to the house that is a break-away in case a tree, etc
falls across the wire. The stuff is so strong that it will pull the
siding off your
Remote controlled tuner
__
Clay Autery, KY5G
(318) 518-1389
On 17-Dec-18 22:39, Don Wilhelm wrote:
To my mind, a matching network at the antenna feedpoint can make an
antenna a resonant antenna as far as the feedline and transmitter are
concerned.
But it is often a s
Beautifully put, Dave. I've had exactly the same experience, and I agree
on all points. And, by the way, as I get older, I'd far rather be doing
my learning in NEC and SimSmith than trudging through my woods or out on
FD or county expeditions putting up antennas that don't work well enough
to
The transmitter and feedline is all that matters. Of coarse, in broadcast only
a single frequency needs to be matched.
There are remotely controlled outdoor tuners for ham bands that perform the
same or better than the typical indoor units.
Sent from my iPhone
> On Dec 17, 2018, at 20:39, Do
To my mind, a matching network at the antenna feedpoint can make an
antenna a resonant antenna as far as the feedline and transmitter are
concerned.
But it is often a single band affair as is resonant dipoles.
73,
Don W3FPR
On 12/17/2018 10:45 PM, W2xj wrote:
Coming from the broadcast side, e
Coming from the broadcast side, especially AM broadcasting, I never considered
resonance particularly important. Really it’s just the transmitter that cares.
We always put matching at the antenna but in ham radio we usually have tuners
at or in the TX.
Sent from my iPhone
> On Dec 17, 2018, a
I am also a retired engineer, and I find that often it is quicker and
easier to put up an antenna cut to the "standard" formula (OK, I start a
bit longer than that), then check with an antenna analyzer and cut from
there. Modeling is great if you can take into consideration all factors
such as
Yes, to each his own. As a retired engineer, I relished the day I could
forego all of the planning, research, design + review cycles, quality
assurance reviews, prototype testing, test reviews, program management
reviews, customer reviews and feedback, and 250K miles/year on United
Airlines.
I've been modeling antennas using EZNEC since back when it was ELNEC,
and I've learned more about how antennas work using it than by any other
means. It is fascinating to set up some wires in the model, plant a
source somewhere, and then look at the radiation pattern and current
distribution
> On Dec 17, 2018, at 1:22 PM, DC wrote:
>
> Many hams now-days miss the most important point of all, I have never made a
> contact by computer modeling, and worrying about wire type and size.
But how many contacts have been missed because people didn’t do computer
modeling or worry about wir
wow I am so embarised
Bob K3DJC
On Mon, 17 Dec 2018 17:25:10 -0500 Don Wilhelm
writes:
> Does this mean that the electrons just will not stop?
> I brake my car when I need to stop it.
> I fix it when it it breaks.
>
> If I pull on the wire enough, it certainly will break.
>
> Proper spelling e
-Original Message-
>> From: elecraft-boun...@mailman.qth.net On
>> Behalf Of Don Wilhelm
>> Sent: Monday, December 17, 2018 9:46 AM
>> To: Richard watson ; elecraft
>>
>> Subject: Re: [Elecraft] wire for random wire antenna using kx3
>>
>&
Does this mean that the electrons just will not stop?
I brake my car when I need to stop it.
I fix it when it it breaks.
If I pull on the wire enough, it certainly will break.
Proper spelling equals meaningful words - the English language is
complicated, but I thought we learned many of the spe
On 12/17/18 3:11 PM, Jim Brown wrote:
> This overly simplified equation fails to account for proximity effe
Proximity effect will effect impedance, which will then effect the loss.
The wire loss equation is dependent on the TL Zo. The previous example
was for Zo=100. Using Zo=75, wire loss for #12
if you can find telephone house service wire,,, is copper clad and
impossible to brake
Bob K3DJC
On Mon, 17 Dec 2018 09:04:04 -0900 Edward R Cole
writes:
> I see the humour genes is alive and well in some hams!
>
> But seriously plastic coated wire will work on HF antennas, though
> you may
if you can find telephone house service wire,,, is copper clad and
impossible to brake
makes good antenna,, not for use as feeders though
Bob K3DJC
>
>
> On Mon, 17 Dec 2018 09:04:04 -0900 Edward R Cole
> writes:
> > I see the humour genes is alive and well in some hams!
> >
> > But seriou
: elecraft-boun...@mailman.qth.net On
Behalf Of Don Wilhelm
Sent: Monday, December 17, 2018 9:46 AM
To: Richard watson ; elecraft
Subject: Re: [Elecraft] wire for random wire antenna using kx3
Rick,
Certainly it will work, and makes for a quick temporary antenna,
particularly indoors.
However, if you
This overly simplified equation fails to account for proximity effect.
On 12/17/2018 12:58 PM, John Oppenheimer wrote:
On 12/17/18 1:58 PM, Jim Brown wrote:
In order of loss at dB/100 ft at 10 MHz from low to high, the
Teflon #12 is lowest at 0.94dB, then RG400 at 1.22 dB (about the same as
RG5
On 12/17/18 1:58 PM, Jim Brown wrote:
> In order of loss at dB/100 ft at 10 MHz from low to high, the
> Teflon #12 is lowest at 0.94dB, then RG400 at 1.22 dB (about the same as
> RG58), then #12 THHN at 1.34 dB. #12 or #10 enameled copper had the
> greatest loss, 2.4 dB/100 ft.
Hi Jim,
Two par
I miss good old WIOU. He had some technical insights which were unique,
to say the least.
Bob, N7XY
On 12/17/18 11:03 AM, Fred Jensen wrote:
Larson E. Rapp is using an alias now?
73,
Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County
On 12/17/2018 7:09 AM, Charlie T wrote:
Yes, but speaker
I didn't think from the original post that this was going to be used as
transmission line.
I pictured simply tying both sides of the speaker wire to one terminal
on the UN-UN.
Speaker wire because he has it, vs. buying wire specifically for a
temporary antenna.
"Random wire" so the 9:1 tra
On 12/17/2018 6:45 AM, Don Wilhelm wrote:
However, if you are using the speaker wire as a transmission line, it
has relatively high loss characteristics
Compared to what? So-called speaker wire (which is really lousy for
speakers because it should be twisted pair to minimize RFI) has Zo in
t
Larson E. Rapp is using an alias now?
73,
Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County
On 12/17/2018 7:09 AM, Charlie T wrote:
Yes, but speaker wire is only good for audio up to about 25 kHz. It has a
frequency limiting component in the wire alloy that must be removed in order
to use thi
I see the humour genes is alive and well in some hams!
But seriously plastic coated wire will work on HF antennas, though
you may see a slight lenthening of resonant length vs bare wire.
My 80m/40m fan inverted-V is made of coated copper-weld and I just
tuned it using my MFJ-269B antenna anal
Be sure the wire is LCOF copper. The electrons are reported to move
faster and with less resistance in that medium. This makes your signal
get to the DX station faster than anyone else . HA HA HA
Seriously folks, to evaluate the insulation on the zip cord or speaker
wire, my method is
April came fast!
K9ZTV
On 12/17/2018 9:28 AM, Don Wilhelm wrote:
Ha, Ha, Ha, Ha!
Where can we find that information? Website please.
73,
Don W3FPR
On 12/17/2018 10:09 AM, Charlie T wrote:
Yes, but speaker wire is only good for audio up to about 25 kHz. It
has a
frequency limiting compone
Ha, Ha, Ha, Ha!
Where can we find that information? Website please.
73,
Don W3FPR
On 12/17/2018 10:09 AM, Charlie T wrote:
Yes, but speaker wire is only good for audio up to about 25 kHz. It has a
frequency limiting component in the wire alloy that must be removed in order
to use this type wi
disseminated with no intended
royalty charges or copyright infringements.
73, Charlie k3ICH
-Original Message-
From: elecraft-boun...@mailman.qth.net On
Behalf Of Don Wilhelm
Sent: Monday, December 17, 2018 9:46 AM
To: Richard watson ; elecraft
Subject: Re: [Elecraft] wire for random wire
Rick,
Certainly it will work, and makes for a quick temporary antenna,
particularly indoors.
However, if you are using the speaker wire as a transmission line, it
has relatively high loss characteristics, and I would recommend that you
think about replacing the transmission line part with real
Hi Rick,
I don't think so. I use speaker wire with my EARCHI antenna--maybe 18-20
gauge-- 25' of coax, 9:1 un-un, and it works just fine. Also a KX3.
73,
John K4ARQ
On Mon, Dec 17, 2018, 08:12 Richard watson Good morning list,
> I was wondering what folks thought about using speaker wire for a
Rick -
I think speaker wire would work just fine. Up to a point, wire is wire. I
used some #18 insulated wire, with a 9:1 un-un and a KX3 while visiting in
Florida several years ago. I ran the wire between two trees, as high as I
could get it, and the tuner in the KX3 matched it on 160 through 10
Good morning list,
I was wondering what folks thought about using speaker wire for a
quick indoor antenna for my kx3.
I've got one of those nelson antennas 9:1 unun and the tuner in the
kx3. Do I need heavier wire and would that make a difference?
thanks and 73 - rick n3gms
60 matches
Mail list logo
