Lew,
I use a 43 foot high inverted-L on 500-KHz. The top hat is 130-foot
long. I have three parallel vertical wires and two horizontal wires
(tied together at base top and end). I get a working bandwidth of
about 495-502 KHz with this extremely short antenna (4.6% of a
quarter wavelength).
Thanks Dick - I have it all working now. I had not unzipped the program
correctly.
-
Brian, K1NW
--
View this message in context:
http://elecraft.365791.n2.nabble.com/K3-Memory-Editor-on-64-bit-Dell-tp5840273p5850715.html
Sent from the [K3] mailing list archive at Nabble.com.
__
Lots of good advice has been given here. The SWR-related coax losses on
60-10 meters will be negligable with decent coax (I use 1/2" Heliax, but
LMR-400 is almost as good), especially with your short run. I use my K3
internal tuner for these bands. For 160- and 80-meters, I have a
remote-swi
A couple years ago I was having some physical problems and had mentioned I
did a lot of soldering. I was immediately sent for lead poisoning test.
Turned out I was being poisoned by one of my medications, not solder.
Geo/W2BPI
__
E
Toxins are a good point raised, and I on more than one occasion have felt the
effects of lead poisoning as you've described. I do not have ventilator hood
either, but now try to work with the window open and have small desktop fan
which attempts to blow most of the fumes and smoke out of that wi
Use your EQ more, no need for external audio gear here.
To make your voice sound more 'round'...peak your low freq settings.
Again, keep playing with the EQ settings and you should get the desired
audio.
73's
Gary
On Mon, Dec 20, 2010 at 10:46 AM, Jeff Hall (W6UX) wrote:
> Thanks to everyone
I can heartily recommend the AD5X 43' remote-switched matching system. I use
one with my Zero Five 43' vertical and it works remarkably well on 160
through 10m. Look for my callsign in the ZL8X online lookup - I worked them
on CW on all bands 160 through 10m and a few on SSB and RTTY too with only
Rich, Your the first person to comment. I'm guessing it was a small batch that
was off the mark...800-850...funny there are not others commenting.
73, Bill
On Dec 19, 2010, at 5:18 PM, K3RWN wrote:
> I concur with all. #836 was mated with its new panel last night.
>
> Rich
>
>
>
Bill Ham
See above.
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James,
I am sure you are in violation of one or more state and federal laws.
Obviously you are polluting the neighborhood at large and the world as a
whole:-) :-)
Now you have incriminated yourself. Oh well.
73, and Merry Christmas to all.
Milt, N5IA
> Toxins are a good point
If you have the kind of dirt I have here in the Sonoran Desert, I contend that
the worst horizontal wire you can put up will be better than the best 43'
vertical you can use.
As long as we're using anecdotal evidence, check my call in the ZL8X log. I
missed them on 10-meter RTTY. Except for 2
Going from loop to vertical involves two very different lob patterns. It
was never mentioned if the antenna performance was to favor local or DX. Here
is one which it does not matter as it adapts for both.
A nice compromise antenna which takes into account:
---high and low angle lobe patterns
Dam I should be dead by now from lead poisoning .!!
Sam Strongin kf4yox
-Original Message-
From: Milt, N5IA
Sent: Monday, December 20, 2010 10:12 AM
To: k2qi@gmail.com ; Ron D'Eau Claire ; elecraft-boun...@mailman.qth.net
; Elecraft Reflector
Subject: Re: [Elecraft] So
live in an apt on ground floor. looking for a stealth ant. see that
elecraft has a small ant. package for sale. Just getting started.
no 100 foot towers. 90 foot wires ect. he said with tongue firmly planted to
cheek
73s
tony Rowland
___
Tony,
The Elecraft antenna tuners do a really fine job for stealth
antennas. I live in a garden home and have an antenna farm that is
completely in my attic. I use a simple long wire on 80/40 that works
well. It is 54' in total length, the ends are bent down 11' to the
attic floor
Fun thread, but time to put it to bed. :-)
73, Eric WA6HHQ
Elecraft List Moderator
On 12/20/2010 7:12 AM, Milt, N5IA wrote:
> James,
>
> I am sure you are in violation of one or more state and federal laws.
> Obviously you are polluting the neighborhood at large and the world as a
> whole!!!
This is interesting. From this statement it appears the KPA-500 will not be in
the circuit until the K3 power level is at 12 or greater watts. Is this
correct? Thanks, Roy Morris W4WFB
Presumably 12 watts is fine with the K3 since that's where the KPA500
switches in!
Ron AC7AC
___
Typo. He meant 'KPA3'.. :-)
73, Eric
===
On 12/20/2010 8:35 AM, Roy Morris wrote:
> This is interesting. From this statement it appears the KPA-500 will not be
> in the circuit until the K3 power level is at 12 or greater watts. Is this
> correct? Thanks, Roy Morris W4WFB
>
> Presumably 12
- Original Message -
live in an apt on ground floor. looking for a stealth ant. see that
elecraft has a small ant. package for sale. Just getting started.
no 100 foot towers. 90 foot wires etc. he said with tongue firmly planted to
cheek
REPLY:
QST had some neat write-ups in their recen
All of this talk about the KPA-500 has gotten me fired up about it again.
Well, we have waited patiently, but no news on when it will be available for
sale or when pre-orders will be accepted.
An update, please? The natives are getting restless.
Robert KY1RK
_
Me too.
I got some cheap Yankee dollars that are getting nervous... And they are either
gonna buy some more gold or a KPA 500. (I would vote for a KPA)
Sent from my iPad
On Dec 20, 2010, at 10:20 AM, "Robert M. Klein" wrote:
> All of this talk about the KPA-500 has gotten me fired up about it
(For the record, I am also addressing some off-reflector extensions of
this thread with a single post.)
We are still talking about an end-fed antenna for 80-10 which presents
unique problems. Trimming the horizontal length of up 30, out 30 for
a good match will help a lot. But that will not addr
Your post is a little elliptical, but am I to understand that you are saying
that there
are resonant effects noted with in-ground radials when the wire is insulated,
but not when
it's bare?
If that's true it's interesting and I hadn't heard it before. Most writers on
the subject
simply say t
No. As I sent in my correction:
"Whups, I meant that's where the KPA3 switches in.
Ron AC7AC"
Just had KPA500 on the mind ;-)
Ron
-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Roy Morris
Sent: Monday, December 20, 20
That's why I prefer an end-fed dipole to a Marconi antenna, even if I have
to get creative to get wire up and in the clear.
The advantage is that the high impedance feed point at the end means very
little current flows, so very little current need flow into the "ground"
connection. Very little cu
The current K3 Utility has a big Troubleshooting MCU Load page in K3 Utility
Help
Let me know if that doesn't get you going, Ken...
73 de Dick, K6KR
On Dec 19, 2010, at 17:17, "Ken Widelitz" wrote:
> I made a mistake and tried to upload the newest MCU prior to uploading the
> uploader update.
For those who might be interested. I found a small little project to build in
"Instructables.com" called a "Fume Extractor" which fits in an Altoids
Tin,(what else), It involves a small computer fan,a piece of carbon fiber
filter from a fish tank filter, a switch, 2, 9v batteries,connectors for
Wes,
> Here is a clue for the guys I hope start looking into this. I cannot
> toggle filter modes in CW either *if PB CTRL is set to .01, but can
> toggle if PB CTRL is set to .05.*
That is correct operation. If PB CTRL = .01, HI/LO is disabled. You
will find that information in the firmware
I unplug the microHAM RS-232 cable and connect a standard
cable from COM1 (the serial port on the motherboard) of
my test system when I need to upload firmware. However,
I know of several others who are using a serial A/B switch
without problems.
For safety reasons make sure the switch is a brea
> When I need to load software or do any adjustments with K3-EZ or the
> Utilities, I switch to the "real" comp port. When I operate, I switch
> to the MicroHam.
There is no need to switch cables to use K3-EZ. Configure K3-EZ to
use the "2nd CAT" port in microHAM Router.
73,
... Joe, W4TV
> Does this mean that I can use K3-EX CONCURRENTLY with N1MM via Router
> on a separate com port, Joe?
I haven't tried it with N1MM Logger but it certainly works with DXLab
Suite with Commander actively polling.
> But it STILL means I must retain my other com port for software
> updates, as it i
It's a screw together kit.. you don't have to even heat the soldering iron.
If you have a small philips screw driver, a pair of needle nose pliers, 2 hands
(that don't shake too much) and eyes that can see relatively small things, I
would say you're ready to go.
> Date: Thu, 16 Dec 201
Another antenna for top band that's worth considering is a Double L (Don
Toman, K2KQ) www.yccc.org/Articles/double_l.htm . It is essentially a
vertical dipole with the ends bent parallel to the ground and in the same
vertical plane. So, if you have, say, a 70 foot or higher tower, you can
raise th
On the Inverted-L off topic, is there anything to be gained, or lost for
that matter, by having more than one of the horizontal portion of the
antenna?
73,
Dick - KA5KKT
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Ron misspoke. He meant the KPA3, not the KPA 500
Dick
On Dec 20, 2010, at 8:35, "Roy Morris" wrote:
> This is interesting. From this statement it appears the KPA-500 will not be
> in the circuit until the K3 power level is at 12 or greater watts. Is this
> correct? Thanks, Roy Morris W
Sorry!! sent the wrong info in last message. The "fume Extractor was not in
Instructables.com but the article appeared in a video on Youtubes.com just go
to youtubes.com and in search type mini fume extractor. which appeared in Make
Magazine article and is in this video.
Sorry, really thought I
Dick, my research would say probably not. The exception would be if your lot
is
such that you could run more than one shorter wire and can't run a single one.
Also you might be able to make a capacity hat with the top guys broken by
insulators and not need another support. The antenna would
I own a K3/10 with ATU and would like to upgrade power. The question
is do I go with the 100w PA option or wait for the KPA500. Any and all
comments are most welcome. Thanks in advance and Merry Christmas to
all.
--
Frank KD8FIP
__
Elecr
If the horizontal wires run parallel to each other, it will start to look
like the old LF antennas Hams used before we moved into the "short waves".
They typically had a number of horizontal wires running parallel held apart
by spacers and erected as high as possible.
Those were really top-loaded
Elliptical? I suppose so. But simply stating the facts seems to have
little effect and just gets bashed, where wading through the issues,
however elliptical, seems to give the nay-sayers some pause, and have
some effect. Radials, even in 2010, 80 years after the last
definitive research, are sti
Here's a quick example from EZNEC:
A 33 ft vertical wire on 3.5 MHz will show an impedance of about 7-j384
ohms. That's a typical "Marconi" antenna.
Add one 33 foot horizontal wire at the top to make an Inverted L and the
impedance jumps to 18-j23 ohms. Note that while the resistive component as
Blankthis is a test only.
NF8J
Paul VanOveren
5911 Snow Ave.
Alto, Mi
616-868-7149
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Frank,
If you think you want 500 watts out, you will have to install the KPA3
(100 watts) anyway. The K3/10 will not be able to drive the KPA500 to
full output - you may be able to get somewhere betwen 200 and 300 watts
out of it.
73,
Don W3FPR
On 12/20/2010 1:39 PM, Frank MacDonell wrote:
Yes, to what James said and I might add that use of the perimeter eves or
balcony is a good choice as is one of the Budipole antennas on a tripod that
you
can take in and out of the house. Put in a good ground rod and away you go.
It
is amazing how well and inventive the manpack and QRP grou
Naked or clothed what is the easiest procedure to follow when programming
these channels in the K3 "0-99" memory. I am having difficulty keeping the
split in memory. Thanks and Happy Holidays! Bob...
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Home:
Why wouldn't Elecraft design the KPA500 to be driven to its rated output by a
K3/10 ?
Bill K3UJ
-Original Message-
From: Don Wilhelm
Subject: Re: [Elecraft] 100 Watts or 500 Watts
Frank,
If you think you want 500 watts out, you will have to install the KPA3
100 watts) anyway
Bill,
It is not an Elecraft choice.
While you could do that as an individual, commercial products (sold in
the US) must meet the FCC requirement of a 15 dB maximum gain That
limits the maximum power gain to a factor of 31.62 - 10 watts in gives
316.2 watts (at the most) output.
73,
Don W3F
But going directly from the K3/10 to the KPA500 might be a good way
for those unhappy with the SSB transmit quality of the KPA3 to get a
very clean signal since the KPA500 uses 70 volt devices for the final
amplifiers. Plus a 3 db. gain over the KPA3. At a cost, of course.
73,
Rick Detting
Not legal in the United States. 15 db gain is the max allowed. The
hams get punished for the illegal activity of others.
73,
Rick Dettinger K7MW
>
> Why wouldn't Elecraft design the KPA500 to be driven to its rated
> output by a K3/10 ?
>
> Bill K3UJ
>
>
>
>
>
> Please help support this
Hi,
Not so sure. That would require the 12W (pre)amp in the K3 to run full tilt.
I seem to remember from the QST review of the K3/10 that it wasn't super
clean at full power either. It's well known that both these amps get
significantly cleaner when run at 50% or less which is what they would do
K2QI wrote: " but now try to work with the window open and
> have small desktop fan which attempts to blow most of the fumes and
> smoke out of that window."
VERY interesting. Is there a chance this approach might finally quiet my
neighbor's DOG?
Terry, W0FM
-Original Message-
From
Hi Don,
I use my SPE Expert 1K-FA with my barefoot K3. I get around 900Wout on HF
and about 500W on 6M. It's a great combination as the K3 talks to the SPE
and everything is transparent including the SPE's built in autotuner.
The SPE display reports over 18dB gain. It has been type accepted and
I read somewhere that the devices in the amp were good for 20+ db of gain. I
think there will be an attenuator pad in the amp that can be bypassed for more
than 15 db gain.
Mark, NØOKS K3 / 10 kit
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Dale,
I am not going to question the legality of the 18 dB gain you are
getting on that SPE nor what the SPE documents filed with the FCC say
about the maximum gain - Mu understanding is only that the FCC says 15
dB is the maximum, and I expect Elecraft will comply with that. What
other com
Mark,
Individual hams can modify their *own* equipment, and we can build our
own equipment too. It still must meet the signal purity and maximum
power output requirements of the FCC, but as far as I know that is about
all - oh yes, I believe it should be of good (or is it sound)
engineering
>From my copy of the ARRL FCC Rules and Regulations for the Amateur
Radio Service, parts 97 and 47 of the Cod of Federal Regulations,
2007:
97.317 Standards for certification of external RF power amplifiers
(a) To receive a grant of certification, the amplifier must:
(2) Not be capable of amplify
Guy,
I know it is not equal to your statements, but in my mind you are making
a good case for the use of elevated (and tuned) radials. L B Cebik
recommended them to me at FDIM several years ago over in-ground radials
and I have never done the work of burying the radials, so I have no
compar
Almost 30 years ago now, before I was 99.% a QRPer, I had an Alpha
76CA (3 tubes). It had a giant swamping pad on the input (I still
have it - the swamping pad, that is). Just take it out and like
magic, you could drive the amp with QRP. My intention was never to
exceed legal limit, just to
I was sitting at the operating position earlier today and kept hearing a "beep"
about every 4 to 5 mins coming from the K3. I run the K3 off a car battery
charged by solar cells, lately there has been no sun. I checked that the
battery and the voltage is at 10.4 volts. Is the beep a "low volta
Yes, your battery voltage is at the warning threshold. You can change
the threshold in the CONFIG:BAT MIN menu entry, but I recommend
keeping at 11.0 V. The K3 is still usable down to as low as about 9.5
or 10 V, although max power output will be scaled back.
73,
Wayne
N6KR
On Dec 20, 2010,
It's very unlikely any solid-state amplifier uses an input attenuator:
Transistors and FET's just don't have that much gain.
Grid-driven tube amplifiers may indeed have enough gain (without the input
pad), but there are a couple potential problems. Without the input pad, the
amplifier may not
Well... keep in mind that an input attenuator also reduces the SWR seen by the
exciter.
Even a relatively small 3 dB pad means that the SWR can't go above 3:1 even if
the input
impedance of the amplifier was zero or infinite!
On 12/20/2010 2:09 PM, DOUGLAS ZWIEBEL wrote:
> Almost 30 years ago
Put on some shorts and navigate to http://www.elecraft.com/k2_remote.htm for
the K3
memory editor. :-P
73, Mike NF4L
On 12/20/2010 3:02 PM, aa...@aol.com wrote:
> Naked or clothed what is the easiest procedure to follow when programming
> these channels in the K3 "0-99" memory. I am having diff
Don's comments reminded me of an article I read a while back about elevated
radials used by commercial AM broadcast stations that may be of interest:
http://www.scribd.com/doc/34884702/New-AM-Broadcast-Antenna-Designs-Having-F
ield-Validated-Performance-by-Clarence-M-Beverage
Yes, the author's na
Any body have a serviceable copy of said book they'd like to sell? Please
contact off list.
73,
Randy, KS4L
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http://www.elecraft.com/books/books.htm
:-)
73, Eric
www.elecraft.com
On 12/20/2010 3:01 PM, Randy Moore wrote:
> Anybody have a serviceable copy of said book they'd like to sell? Please
> contact off list.
>
> 73,
> Randy, KS4L
_
Guy:
Very interesting
Some of your comments were verified in a recent QST article.
Mar 2010 - QST (Pg. 30)
An Experimental Look at Ground Systems for HF Verticals
The author experimented with resonant vs nonresonant radials on the ground
and found performance improved when the radials were
On 12/20/2010 1:48 PM, Don Wilhelm wrote:
> There are good reports of elevated radials, although some measurements
> by Tom Rauch W8JI indicated some disagreement, but for my situation it
> is the best solution despite any controversy.
Elevated radials are great until the metal thieves get arou
On Dec 20, 2010, at 12/203:36 PM, Eric Swartz - WA6HHQ, Elecraft
wrote:
> http://www.elecraft.com/books/books.htm
Is Elecraft still shipping the Second Edition of the ARRL HF Digital
Handbook whose cover is on that page? The 4th Edition has been out
since 2007!
73
Chen, W7AY
___
It is a matter of loss or lack of it. If you look at the takeoff patterns of a
vertical antenna on a perfect ground and then with increasing loss, the pattern
is modified to have increasing less energy on the horizon. However, this is
the
loss factor, not necessarily due to lack of resonance.
On Dec 20, 2010, at 12/203:44 PM, Steve Ellington wrote:
> Some of your comments were verified in a recent QST article.
>
> Mar 2010 - QST (Pg. 30)
A more complete version of Rudy's study are in 6 parts in the 2009
issues of QEX.
"Experimental Determination of Ground System Performance fo
Outgassing is a good reason to wear eye protection when soldering larger
diameter holes on a PCB, where there can be more solder & the space for
a bigger bubble to form that expands when heated & can discharge the
solder like a molten round.
Happened to me at work once, assembling terminals tha
That's my experience too. Your Inverted L has a much, much higher impedance
than any Marconi antenna on any band where it's 1/2 wave or longer. That
makes the efficiency far less dependent upon the ground and the effect of
the ground much less.
Ron AC7AC
-Original Message-
Now here's th
That's my experience too. Your Inverted L has a much, much higher impedance
than any Marconi antenna on any band where it's 1/2 wave or longer. That
makes the efficiency far less dependent upon the ground and the effect of
the ground much less.
Ron AC7AC
-Original Message-
Now here's th
Mel,
I personally would not consider elevated radials that are non-resonant -
but then all of my antennas are resonant.
I could consider something "balanced", like a 43 foot vertical having 43
foot elevated radials and being fed with parallel feedline to the
location of the tuner. I would e
On 12/20/2010 2:09 PM, DOUGLAS ZWIEBEL wrote:
> Almost 30 years ago now, before I was 99.% a QRPer, I had an Alpha
> 76CA (3 tubes). It had a giant swamping pad on the input (I still
> have it - the swamping pad, that is). Just take it out and like
> magic, you could drive the amp with QRP.
"I personally would not consider elevated radials that are non-resonant"
I guess I'm having a difficult time with that comment. You can have a
resonant system without the elevated radials themselves being
"resonant" ... i.e, any two of them acting like a resonant dipole. If
the elevated ra
Fred and all,
That is something to be heeded. The Elecraft example is that the K2
key-clicks were not a problem until the KPA100 was introduced. The
added gain of the KPA100 caused that problem to be amplified (along with
the signal). Elecraft responded with the Keying Waveshape Mod kit w
Dave,
If you read the radial tuning procedure in Low-Band DXing, you will find
that it "all comes out in the wash". Yes, your statements are correct,
and in fact that is how I did mine. Although I did not resonate my
vertical monopole against any ground plane - I simply cut the lengths to
"It's very unlikely any solid-state amplifier uses an input attenuator:
Transistors and FET's just don't have that much gain."
The Ameritron ALS-600 has about a 15 ohm input impedance. Then they put a
series 35 ohm resistor for matching and reducing gain.
Phil - AD5X
_
We always ship the latest version. I'll update the picture :-)
e
On 12/20/2010 3:50 PM, Kok Chen wrote:
> On Dec 20, 2010, at 12/203:36 PM, Eric Swartz - WA6HHQ, Elecraft
> wrote:
>
>> http://www.elecraft.com/books/books.htm
> Is Elecraft still shipping the Second Edition of the ARRL HF Digi
Phil,
Your statement amplifies the difference between "ham assumptions" and
reality.
The data-sheet indications of gain do not consider the input impedance
(and loading of the driver), that parameter is quite important in actual
use -- if the amplifier does not provide a good load to the driv
Buried BARE radials of sufficient number will show far less "tuned"
behavior and self-terminate more rapidly.
BURIED bare wire radials and ON THE GROUND bare radials measure quite
differently. This too is something you can verify by experimenting
with a bare wire DOG on top of the ground vs an en
For those who wish to pursue the radials question further, here's one of the
many publications on the subject. This one is replete with numerous tables
and graphical representations of the incremental value of more and longer
radials in various types of soil:
http://www.ncjweb.com/k3lcmaxgainradia
15 ohms miscellaneous in series with 32 ohm radiation resistance, only
3%? Don't you mean 30%?
What were the lengths of the elevated radials and how many?
73, Guy.
On Mon, Dec 20, 2010 at 8:27 PM, Don Wilhelm wrote:
> Dave,
>
> If you read the radial tuning procedure in Low-Band DXing, you wi
On 12/20/2010 4:57 PM, Fred Jensen wrote:
> The [in]famous B&W "all band folded dipole" capitalized on this -- big
> 50 ohm load resistor = 50 ohms everywhere. I still see them around
> National Guard Armories.
You can see one in my back yard as well, 30 ft AGL. It's the
best that I can do
Sure, but it's very easy to design a low-loss broadband matching network to
provide the required impedance transformation.
One HB amp of mine used a 16:1 transformer at the input for just that
purpose.
Ron AC7AC
-Original Message-
Phil,
Your statement amplifies the difference between
Yes and they work VERY well for their purpose.
Shoot even the much admired Rhombics using acres of space threw away half of
the RF if they were terminated for unidirectional operation.
Ron AC7AC
-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.
I hope people doesn´t learn from this statement.
IMO this is as far from logic one can get.
/Jim
--
On 2010-12-21 02:27, Don Wilhelm wrote:
>
> The ground conductivity in my area is not the greatest, so I have
> accepted the logical consequences of that fact.
>
> 73,
> Don W3FPR
>
_
I just have one question: What is grass?
--- On Mon, 12/20/10, Guy Olinger K2AV wrote:
>
> Many people are adopting a construction technique as
> primary over
> performance considerations, e.g. lay out wire and hold them
> down with
> lawn staples and let the grass grow up around them, holding
I suspect that Don was referring to the fact that poor ground
conductivity affected his low angle performance, and that is absolutely
true. There isn't a thing he or anyone else can do to change the far
field effects of poor ground. He can add lots of radials, buried or
otherwise, to improv
It's that ugly green stringy stuff some people use to hide their
beautiful brown dirt so that nobody tries to steal it.
Dave, AB7E
QTH not far from N7WS
On 12/20/2010 10:37 PM, Wes Stewart wrote:
> I just have one question: What is grass?
>
> --- On Mon, 12/20/10, Guy Olinger K2AV wrote:
>
Guy,
OK, I missed by a factor of 10.
I am using 2 elevated radials per band, and the physical direction is
such the pairs are horizontally opposed - that should reduce the
radiation from the radials to zero (or nearly so).
I first cut the radials 15% longer than the "formula" would indicate,
On 12/20/2010 5:08 PM, Don Wilhelm wrote:
> The Elecraft example is that the K2
> key-clicks were not a problem until the KPA100 was introduced. The
> added gain of the KPA100 caused that problem to be amplified (along with
> the signal). Elecraft responded with the Keying Waveshape Mod kit whic
Guy,
OK, I missed by a factor of 10.
I am using 2 elevated radials per band, and the physical direction is
such the pairs are horizontally opposed - that should reduce the
radiation from the radials to zero (or nearly so).
I first cut the radials 15% longer than the "formula" would indicate,
On 12/20/2010 5:28 PM, Phil & Debbie Salas wrote:
> "It's very unlikely any solid-state amplifier uses an input attenuator:
> Transistors and FET's just don't have that much gain."
>
> The Ameritron ALS-600 has about a 15 ohm input impedance. Then they put a
> series 35 ohm resistor for matching a
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