On Fri, Apr 19, 2024, 2:42 PM Dave Cuthbert wrote:
> ... " WWAS accomplished this feat of
> engineering through the development of a two-element antenna that generates
> the electric field and the magnetic field separately." ...
>
Ah, he claimed to know more that James Clerk Maxwell, did he?
Not again! (Sigh)
Mike
W0BTU
_
Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
That's an excellent idea!
73 Mike
W0BTU
On Tue, Jan 30, 2024, 1:10 PM Mark wrote:
>
> ... I am surprised this contest isn't run around the equinoxes to level
> the playing field, not to mention evening out the effect of QRN.
>
_
Searchable Archives:
Thank you for the information. :-)
73 Mike
W0BTU
On Fri, Jan 26, 2024, 5:06 PM Don Kirk wrote:
> Hi Mike,
>
> As far as I know the RBN receivers are not related at all to the
> websdr.com receivers.
>
> Don wd8dsb
>
> On Fri, Jan 26, 2024 at 5:12 PM Mike Waters wrote:
Hello Don es Roger,
Can I assume these RBN SDRs are also on websdr.com? If so, which ones? That
is, what are they called, so we can listen to the right ones?
I no longer have any antennas.
73 Mike
W0BTU
On Fri, Jan 26, 2024, 3:54 PM Don Kirk wrote:
> I know 3 RBN reporting receivers located
I'd kind of like a recording too, if one exists. I went to a hospital for a
stress test this morning expecting to go right home afterwards. But here am
in the hospital room after they put a stent in a coronary artery. :-)
73 Mike
W0BTU
On Mon, Nov 13, 2023, 7:27 PM Richard (Rick) Karlquist <
On Tue, Oct 24, 2023, 10:55 AM uy0zg via Topband
wrote:
>
> But it’s better not to be sad :-
Beautiful advice! :-)
Let’s congratulate Dmitry,
> UT5UGR - yesterday, in a desperate dash, he finally got into the T2C
> log!
>
What antennas did each of them use, do you know?
73 Mike
On Mon, Oct 23, 2023, 7:15 PM Tree wrote:
> Here in Oregon - the solar cycle has a huge impact on European propagation.
>
Same here in Missouri!
73 Mike
W0BTU
>
_
Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
pistols
> rubbing along with the big guns. We work with what we have.
As I said, no harm or ill will intended. Just trying to save some folks
from misinformation. :-)
David G3UNA
>
>
> -Original Message-----
> From: Topband On
> Behalf Of Mike Waters
> Sent: Thursday, A
Contrary to what you hear repeated on the bands year after year, what Jim
said is *exactly* right! :-)
I'll add that NVIS is rarely —if ever— useful for working DX on 160m.
73 Mike
W0BTU
https://web.archive.org/web/20190827040547/http://w0btu.com/
On Thu, Aug 24, 2023, 1:40 PM Jim Brown wrote:
4, 2023 at 9:42 AM Mike Waters wrote:
>
>> If you don't already have it, *Low Band DXing* by John Devoldere, ON4UN
>> (published by the ARRL) has a very informative chapter about receiving
>> antennas. Most of it is about Beverage antennas. Highly recommended.
>>
>>
If you don't already have it, *Low Band DXing* by John Devoldere, ON4UN
(published by the ARRL) has a very informative chapter about receiving
antennas. Most of it is about Beverage antennas. Highly recommended.
73 Mike
W0BTU
https://web.archive.org/web/20190827040547/http://w0btu.com/
On Thu,
I bought my Bournes 90 volt GDTs from Mouser.
73 Mike
W0BTU
On Tue, Aug 1, 2023, 8:27 PM R. David Eagle via Topband <
topband@contesting.com> wrote:
> Thanks Ken et al.I appreciate all of the info. I am going to start
> reading through the articles when kids hit the hay! You can really
Hi Dave,
Check out my old webpage at
https://web.archive.org/web/20181115070846/http://www.w0btu.com/Beverage_antennas.html
73 Mike
W0BTU
On Sun, Jul 30, 2023, 7:36 AM R. David Eagle via Topband <
topband@contesting.com> wrote:
> Hello all,
> I am in the process of putting together a couple
On Sun, Jun 25, 2023, 5:42 AM Michael Rutkaus wrote:
> ... most of the time
> had a friendly "swing" to his sending, it sounded like a casual friendly
> conversation. And Kay's CW was friendly and precise.
>
Sounds like he had a Vibroplex "bug"? Reading back through old QSTs in the
monthly
ter with a handful of the usual EU suspects but not
> great signal reports on RBN.
>
> Regards
>
> Paul MM0ZBH
>
>
>
> On Mon, 19 Jun 2023 at 23:01, Mike Waters wrote:
>
> > On Mon, Jun 19, 2023, 4:14 AM Roger Kennedy <
> ro...@wessexproductions.co.uk
>
On Mon, Jun 19, 2023, 4:14 AM Roger Kennedy
wrote:
>
> Well I don't know how others got on . . .
>
> But I didn't hear one single North American station on Saturday night !
>
Did any other European stations?
73 Mike
W0BTU
>
_
Searchable Archives:
On Fri, Jun 16, 2023, 7:54 AM Roger Kennedy
wrote:
>
> But how are conditions in North America at the moment . . . are you getting
> a lot of QRN? (we have hardly any over here)
>
Visit https://lmaps.org/#-93.83;37.27;3 to see the current thunderstorms in
North America.
Main site is
Just attenuate the signals. A few resistors is way cheaper than 195 bucks.
Or a 2k pot. ;-)
73 Mike
W0BTU
On Fri, Apr 21, 2023, 11:56 AM Eric Scace K3NA wrote:
> Being so close to the transmitter site. it's quite possible that you are
> experiencing receiver front end overload, and your
On Sat, Jan 28, 2023, 1:38 PM Charles Morrison <
charles.morrison.n...@gmail.com> wrote:
> Many poor operators in Europe do not respect an area CQ, especially on CW.
> On SSB Many poor operators in Europe wont even respect a DX station when
> he calls for a specific prefix or suffix, why would
On Sat, Jan 28, 2023, 11:59 AM Roger Kennedy
wrote:
> ... However, I never call CQ in these contests, as I don't want to waste
> time
> getting called by dozens of EU stations!
>
What's wrong with calling CQ [AREA]?
e.g.
CQ DX
CQ NA
CQ SA
CQ ...
And if you get called by a EU, just ignore it.
On Fri, Jan 27, 2023, 1:45 PM Tim Shoppa wrote:
> ... I am hearing horrible intermod with local AM station WAVA AM 780.
>
The only debugging I can think of is, disconnect all antennas (including
your 160m) except for one, then insert a step attenuator between it and
your receiver.
If it
I haven't seen anyone mention ferrite chokes. 1 turn through 73 material
binocular cores or beads should fix that, from 160m through HF. Place them
as close as possible to the GFCI.
73 Mike
W0BTU
_
Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
http://lists.contesting.com/_topband/
It's at the bottom of every post. :-)
73 Mike
W0BTU
On Wed, Dec 28, 2022, 9:06 AM Fred Moeves wrote:
> What happened to the Topband Archives the link I have no longer works.
>
> Thanks
> Fred KB4QZH
>
> _
> Searchable Archives:
All,
Kindly direct questions to this group, and not to me privately. TIA.
73 Mike
W0BTU
On Sat, Dec 24, 2022, 1:49 PM Mike Waters wrote:
> Oops! DON'T use an RF choke for a single-wire Beverage. Just the OY 470
> ohm resistor to a good RF ground. Sorry.
>
> 73 Mike
> W0BTU
>
Oops! DON'T use an RF choke for a single-wire Beverage. Just the OY 470 ohm
resistor to a good RF ground. Sorry.
73 Mike
W0BTU
On Sat, Dec 24, 2022, 1:44 PM Mike Waters wrote:
> You need to drain off the snow static etc. with a resistor in series with
> a proper RF choke. The
You need to drain off the snow static etc. with a resistor in series with a
proper RF choke. The values are on this page. And buy the Ohmite resistor
specified! :-)
https://web.archive.org/web/20181115070846/http://www.w0btu.com/Beverage_antennas.html
On Sat, Dec 24, 2022, 12:34 PM Wes wrote:
Yes, the advantages of having good Beverage antennas in addition to an
inverted-L are very well established indeed. I (and thousands of other
Topbanders) can vouch for that from personal experience.
Yes, there are times when your inverted-L will out-hear good Beverages.
Even DX, *but that is the
Another con about kites is that they need atmospheric lift to stay up. My
first field day in the late 1970's, Tom W8JI was working Hungary on a
kite-supported antenna from near Toledo, until nighttime wind conditions
brought the kite down.
What's been said about windy days and WX balloons also
That's a new one for me! A short Beverage for higher-angle signals. Thanks!
I need a few of those here for closer stateside signals. :-)
73 Mike
W0BTU
On Mon, Dec 12, 2022, 9:55 AM Frank Donovan wrote:
>
> ... Once you get your loop antenna going you might consider experimenting
> with
Have you called the power company? The chief engineer from Ozark Electric
here has gladly used their expensive noise tracking SDR and VHF antenna
(and my Beverages) to find it and fix it.
73 Mike
W0BTU
On Wed, Dec 7, 2022, 2:48 PM Richard (Rick) Karlquist
wrote:
>
> Can anyone inform me at to
Thanks Mark (and all the others who replied)!
This seems to be exactly what I was looking for. I wasn't expecting any of
these Web SDRs to have the type of RX antennas that contesters use. Mostly,
I wanted to listen to keep my CW skills up. But it'll also be fun to see if
I hear any DX.
Good
My 160m antennas are all down, but I'd love to listen! Can anyone suggest a
Web SDR with usable CW 160m reception?
TIA!
Mike
W0BTU
On Thu, Oct 20, 2022, 9:41 AM Tree wrote:
> The "Low Band Jack" version of the Stew Perry contest will be held this
> weekend, starting at 1500Z on Saturday.
>
There is an active LF and MF Slack chat group. Links from there to many
websites about 630 and 2200m.
You should see the TX and RX arrays that some of those guys have!
Download the Slack app to join.
73,
Mike
W0BTU
_
Searchable Archives: http://www.contesting.com/_topband -
Chester,
Kindly note the statements below, especially the one from the OP.
73 Mike
W0BTU
On Tue, Sep 6, 2022, 12:35 PM Chester Latawiec wrote:
> Looking for 6L6s to rebuild a Collins 32-G transmitter. It uses 8 or 9
> 6L6s!!
> ___
> ... When replying, please edit your
rtical radiator with an
> >excellent radial system, and the best RX antenna system that will fit on
> >your property. Most of the arrays others have suggested are not
> >practical on five acres, if for no other reason that a GREAT radial
> >system for each element is critic
adial system, and the best RX antenna system that will fit on
> your property. Most of the arrays others have suggested are not
> practical on five acres, if for no other reason that a GREAT radial
> system for each element is critical.
>
> 73, Jim K9YC
>
> On 3/25
This is a great piece of advice!!! I would add: check those QRN levels at
various times and on different days.
73 Mike
W0BTU
On Fri, Mar 25, 2022, 10:01 AM Fred Kleber wrote:
>
> ... before you even make an offer on a piece of property, go there with a
> mobile receiver and check to see what
Being the simplistic cheapskate that I am, I got rid of all my AM IMD with
a 2k pot in the receive line. :-)
Tip from W8JI about 40 years ago. Just attenuate everything. Works for me.
73 Mike
W0BTU
On Sun, Feb 20, 2022 at 11:42 AM jim.thom jim.t...@telus.net <
jim.t...@telus.net> wrote:
> Has
On Sun, Feb 20, 2022, 2:55 PM Jim Brown wrote:
> On 2/20/2022 10:53 AM, Mike Waters wrote:
> > And RG-6 has a power handling curve very similar to RG-213.
>
> WRONG! This may be true of SOME RG6 cables, but definitely NOT true of
> many.
>
Point well taken, Jim! I
I can testify that F connectors with RG-6 will handle the legal limit on at
least 160 and 80 without even getting warm.
This is true here with 2500 watts into a dummy load and CW contesting.
I waterproof mine by partially filling them with silicone dielectric
grease. Been doing that here for
Thank you, Mel. This needed to be said. :-)
On Tue, Feb 1, 2022, 1:00 PM MEL CRICHTON wrote:
> Folks... when you reply to a post PLEASE do not include the entire
> digest in your reply just the message, or even better just the line
> or paragraph, that you are responding to. I could not
Hi Pete,
You've received good advice here.
Do you have a rotator on your K9AY loop? It has a deep null in one
direction, which null should be aimed at your low-angle QRN or QRM source.
Disclaimer: I never used one (since I have 580' Beverages). However, over
the years I have read many, many
I just happened across an ARRL article yesterday that said that OTH radar
QRM is terrible (worse by far than anything else) in IARU Region 1. Are
there any on 160? If so, that might explain some of the problem.
There are now about 800 active OTH radar installations, mostly in Russia
but in other
Hello Roger,
Time spent doing something you enjoy is not wasted time. :-)
And I enjoyed every minute of it, before advancing age and health took me
off the bands. That included sharing what I learned on a website.
73, Mike
W0BTU
On Wed, Oct 27, 2021, 2:35 PM Roger Kennedy
wrote:
>
>
> I
Roy, this was *very* interesting! Thanks for sharing. :-)
73 Mike
W0BTU
On Sun, Jun 6, 2021, 3:04 PM Roy Morgan wrote:
> Topbanders interested in laser measurements,
>
> Here are some short stories. During the time I worked at NIST (formerly
> NBS), I heard about these situation:
>
> The
Your video is very accurate, Steve.
The best noise antenna I ever used was a 580' Beverage, pointed directly at
the RFI.
73, Mike
W0BTU
On Fri, Apr 16, 2021, 10:49 AM VE6WZ_Steve wrote:
> If you have ever tried to eliminate local noise using a phase box (noise
> canceller) like the MFJ-1026
Exactly. Pete, #31 mix is very important. Jim knows what he's talking
about! :-)
73, Mike
W0BTU
https://web.archive.org/web/20180815141931/http://w0btu.com/160_meters.html
On Thu, Mar 25, 2021, 2:09 PM Jim Brown wrote:
> On 3/25/2021 11:39 AM, N4ZR wrote:
> > The feedpoint choke is wound on a
Well said. It's past time for that.
73 Mike
W0BTU
On Wed, Mar 10, 2021, 11:00 PM W0MU Mike Fatchett wrote:
> Seems like it might be time to remove or moderate people on this list.
> This is a bit over the top.
>
>
_
Searchable Archives: http://www.contesting.com/_topband -
Thank you.
I think you should put some of the complainers on "moderate mode". That is,
we must pre-approve all posts in the future from them. But depending on how
often they post, that might take a lot of time; so a ban —that increases in
length for each future infraction— would be more
On Tue, Mar 9, 2021, 10:36 AM Lloyd - N9LB wrote:
> Will someone please start an "I Hate FT8" group and move all this
> unproductive chatter off of the Top Band reflector.
>
Thank you, Lloyd! I couldn't agree more.
The full moon must be waking the curmudgeons from their coffins. Enough of
this
When anyone posts here about FST4 —or any other digital mode— *please*
include 160digi...@groups.io as a recipient.
Thank you! :-)
73, Mike
W0BTU
On Mon, Feb 8, 2021, 6:52 PM Jim Miller wrote:
> I've been looking at FST4 as a possibility for getting some more difficult
> new ones on 160.
>
Good answer, Larry! Lots of previous, searchable info by Guy, K2AV and
other 160m antenna gurus go into that in more detail.
Bob, a popular preamp —that I also built and use— is the W7IUV single
bipolar transistor one. Somebody sells it as a kit. I have a 2K pot and
series-parallel 1N914
Not to be overlooked is that there is much information and experiences
about BOGs in the searchable archives here.
I see folks asking about various other subjects, and the replies are often
not near as useful as what was previously answered. That link at the bottom
of this and every post here is
ce. For those turns counts I go to # 75
> material toroid cores which have slightly more winding room but require
> more turns usually for 160 meter stuff. All this probably more than you
> wanted to know. HNY
>
> Lee K7TJR OR
>
>
>
> *From:* Mike Waters
> *Sent:* S
Lee,
What kind of wire do you use that allows that many turns (4t and 16t)?
73 Mike
W0BTU
On Sat, Jan 2, 2021, 1:37 PM Lee STRAHAN wrote:
> Hello Csaba,
>I approach this problem this way your impedance ratio is 745/50 ohms or
> 14.9 . To get turns ratio use the square root of that which
Thanks for catching that, Dave!
I certanly can't argue with Rudy N6LF, but those two λ/4 10' high elevated
radials in my old 160m page made that inverted-L a "killer"* in an ARRL 160
contest about 10 years ago. That was using only 100 watts. Broke a number
of DX pileups, to my utter amazement.
relevant to
> amateur DX? Or is it a happy coincidence?
>
> David G3UNA/G6CP
>
> On 01 January 2021 at 20:09 Mike Waters wrote:
>
>
> This link at to top of that page is a must-read, too.
>
> https://web.archive.org/web/20180923221943/http://lists.contesting.com/_topband/20
covered all of the above and much
more in my talk at the Antenna Forum at the Dayton Hamfest in 1996.
73,
William
W4BZ
73 Mike
W0BTU
On Fri, Jan 1, 2021, 2:01 PM Mike Waters wrote:
> On Thu, Dec 31, 2020, 9:10 PM Artek Manuals
> wrote:
>
>> Elevated radial systems NEED a choke
On Thu, Dec 31, 2020, 9:10 PM Artek Manuals
wrote:
> Elevated radial systems NEED a choke ..PERIOD. Been there , done that,
> got the RF burns to prove it...8^(
>
You bet they do! Otherwise, the coax feedline on the ground seriously
degrades the antenna's performance! I don't recall anyone
Hi Roger,
Like the others, I never once thought that you were lying. Respectfully,
could you please tell us a little more about your dipole, tower, etc.? For
example:
- How is the dipole oriented?
- How is it fed?
- Are you near a body of water?
- Could there possibly be some
Well said, Clive! :-)
On Fri, Dec 18, 2020, 9:10 AM wrote:
> All antennas work, some better than others, a choice of one maybe not
> ideal.
> * Without an A/B comparison impossible to judge* and I would add if any
> vertical system is less than a quarter wave high it puts additional
> pressure
A few words of wisdom about 160m antennas from W8JI, ON4UN and others...
https://web.archive.org/web/20180815141931/http://w0btu.com/160_meters.html
73 Mike
W0BTU
_
Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
There were few experts like John. His latest *Low Band Dxing* book is the
most important amateur radio publication in my library.
He left us with a lot to be grateful for, and which will also greatly
benefit those starting out on 160m and higher.
Don't forget! John also used to be active on the
Kenny,
I believe that Tom, W8JI uses them and has a webpage on this subject. Have
you looked at that?
73, Mike
W0BTU
On Sun, Oct 18, 2020, 10:20 AM Kenny Silverman wrote:
> ...Regardless of the phasing I’m modeling, the side and back lobes are not
> to my liking. ...
>
_
Gentlemen,
I am in full agreement with the many statements that Vic Misek's design (at
least in the first edition of his book) is, uh, 'not the best', and a
ground screen (or grounded wire) under a Beverage is 'mostly' *not* a good
idea. Over 40 years ago I was going to built it, but W8JI himself
Tree,
May I suggest that you move the line:
When replying, please edit your Subject line so it is more specific than
"Re: Contents of Topband digest..."
... up to the top. ;-)
73 Mike
W0BTU
On Fri, Aug 14, 2020, 11:06 AM <57jndenn...@comcast.net> wrote:
> The update killed my LAN and I had
To add to this ...
*THE SOLAR MINIMUM SUPERSTORM OF 1903:* Don't let Solar Minimum fool you.
Superstorms are possible even during the "quiet" phase of the solar cycle.
A new study just published in the Astrophysical Journal Letters looks back
to October 1903. Solar activity was at a low point
Hi Jerry (et. al.),
Yes, let's have some updated selling guidelines. Reasonable ones. And as
someone nicely pointed out, there are well-established websites (like
qrz.com or qth.com) if you want to sell your antique Morse code key or your
multiband linear.
Correct me if I'm wrong, but it seemed
Hank,
I don't quite understand your question. Obviously, it's on 1610.
You looking for a list?
73 Mike
W0BTU
On Sun, Jul 5, 2020, 3:16 PM HP wrote:
> Where is the place to see active 1610 stations - I used to hear the one
> for Sky Harbour A/P
> here in Phoenix - but no more -hope not just
I thought those roadside TIS stations are on 530 khz, Larry. Are they also
on 1610? Anyway, thanks for sharing!
73 Mike
W0BTU
On Sat, Jul 4, 2020, 10:56 AM Tree wrote:
> Been testing my new SW Beverage using the 1610 kHz channel. This channel
> is mostly (if not entirely) low power stations -
Hi Mark,
After following this thread, and assuming that your coax connectors etc.
are properly installed, I strongly suspect that you need to improve your RF
earth ground. Its resistance is likely too high.
Add some random-length ground radials, about 4 or 5 of them running from
the rod in
Sounds like his email account might have been compromised. I received one
of these from him, too.
Terry, change your password, and make it a secure one like this:
https://blog.avast.com/strong-password-ideas
Update Windows.
And run a virus scan on your computer, like Malwarebytes.
73, Mike
73, Mike
W0BTU
On Sat, May 9, 2020, 6:52 PM Artek Manuals wrote:
> More like 150 ohms as I recall
>
> Dave
> NR1DX
>
> On 5/9/2020 7:34 PM, Mike Waters wrote:
> > Fred, those transformers are the wrong impedance ratio for WD1! They are
> > for 420-450 o
Fred, those transformers are the wrong impedance ratio for WD1! They are
for 420-450 ohm wire. WD-1 has a much lower impedance.
73, Mike
W0BTU
On Sat, May 9, 2020, 5:49 PM Fred Moeves wrote:
> Thanks to everyone with some very good advice and good ideas
> I am now looking for a good place to
https://web.archive.org/web/20181115070846/http://www.w0btu.com/Beverage_antennas.html
73, Mike
W0BTU
On Fri, May 8, 2020, 1:12 PM Fred Moeves wrote:
> Getting ready to put up a 2 wire reversible Beverage and I have a few
> questions and looking for some ideas…
>
_
Searchable
atest Video: https://ka6wke.net/gmail
> Website: https://www.ka6wke.net
>
>
>
> On Thu, Apr 16, 2020 at 12:26 PM Mike Waters wrote:
>
>> This looks interesting, even though I would rather read text than watch a
>> video. I just bookmarked it, and will watch some later. T
This looks interesting, even though I would rather read text than watch a
video. I just bookmarked it, and will watch some later. Thanks!
73, Mike
W0BTU
On Thu, Apr 16, 2020, 2:08 PM Mark Schoonover wrote:
>
> Website: https://www.ka6wke.net
>
_
Searchable Archives:
"Solid" in this context means not braided, and that is what the inner
bonded foil shield is in my RG-6 (actually F-6, for CATV). I left out
"foil", sorry.
73 Mike
W0BTU
On Thu, Apr 9, 2020, 12:19 PM K9FD wrote:
> Ever see RG6 with a solid aluminum shield?
>
> > One thing that hasn't been
One thing that hasn't been mentioned here is how the aluminum shield,
jacket, and dielectric behaves. I'm pretty sure that the CoE/°F of
aluminum is *more than twice* that of copper and steel.
I am speaking specifically about a solid aluminum shield bonded to the
dielectric.
Braided shields
Ham,
I, for one, was thoroughly enjoying this discussion
I just learned some valuable information concerning one particular
limitation of even the most advanced modeling software.
You may not know these men, but they are among the top technical experts in
the field. They dispel a lot of myths
You may find this interesting.
https://ham.stackexchange.com/a/14799/8717
How useful it is, is another matter! ;-)
73, Mike
W0BTU
On Mon, Mar 23, 2020, 5:02 PM Chortek, Robert L. <
robert.chor...@berliner.com> wrote:
>
> How would one categorize the quality of ground consisting of grass. For
>
How about 5Y3GT? ;-)
On Mon, Mar 23, 2020, 4:45 PM George Dubovsky wrote:
> > This would give new meaning to the 'oldie' WFWL. I never heard of a
> > "Slim" confirming a contact.
> >
> > Perhaps you never heard of P5RS7. I've got a card.
> >
>
>
_
Searchable Archives:
An important point worth mentioning here is that the life of gas discharge
tubes is reduced every time they conduct. Exactly how much depends on the
arc current, which is explained in the Bournes GDT data sheets, but their
life can be significantly extended by the following simple and inexpensive
Reading the manual I have for the MFJ-1026 says "The MFJ-1026 is
> optimized over the range of 1.8 to 30 MHz". Does the MFJ-1025 only go to
> 20MHz?
>
> 73, Mike W4EF....
>
>
> On 3/17/2020 10:31 AM, Mike Waters wrote:
> > Mike, is there any reason why
Roger,
I didn't realize that the 1025 (which is what I have) didn't have a preamp
on the auxiliary (noise) antenna input!
I chose the 1025 over the 1026 because I did not want the small whip
antenna, which only works well if you have RFI close to it. If I would have
realized that the 1026
Mike, is there any reason why you tested it above 20 MHz? That's outside
the 1026's specified frequency range.
73, Mike
W0BTU
On Tue, Mar 17, 2020, 9:07 AM Michael Tope wrote:
> I just happen to have a spare MFJ-1026 at home. I did a real quick test
> using my FT1000MP MK-V while powering the
Tom Rauch, W8JI has a nice webpage dedicated to the MFJ-1025/1026 at
https://www.w8ji.com/mfj-1025_1026.htm.
A few relevant excerpts follow.
"The only drawback of the higher noise floor of the MFJ-1025/1026 is you *must
place it after any amplifiers used with low-level low-noise antennas*. The
This is what I have been thinking all along.
On Mon, Mar 16, 2020, 1:47 PM Lloyd - N9LB wrote:
> Possibly static, nearby lightning, or high levels of TX RF may have
> damaged one or more of the semiconductors in your MFJ-1025.
>
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I fully agree with the statements below. *Most* of the time, a vertical is
superior for DX on 160m. Please see:
https://web.archive.org/web/20170703105635/http://www.w0btu.com/160_meters.html
73, Mike
W0BTU
On Mon, Mar 16, 2020, 7:52 AM Roger Kennedy
wrote:
>
> ... DX propagation on 160m ISN'T
Exactly! This is very important to get a deep noise null.
Mike W0BTU
On Sat, Mar 14, 2020, 1:55 PM Michael Tope wrote:
> Another pitfall that you have to be careful to avoid with the MFJ-1026
> is making sure the level of the QRN you are trying null that is coming
> out of the sense antenna
Steve,
I have an MFJ-1025, and I have never experienced your issues. I was going
to ask some of these questions myself.
I have had very good results indeed with mine for eliminating a single
source of RFI. Something at your end is not right.
Mike,
There have been cases where my 580' Beverage
Me neither.
On Fri, Mar 13, 2020, 12:22 PM Wes wrote:
> It's not clear to me.
>
> Wes N7WS
>
> On 3/13/2020 9:42 AM, Jim Thomson wrote:
> > ## Clearly whats required is a long overdue increase in TX
> power limits on 160 band...and also 80+40.
> > That or arrl legal remote
On Thu, Mar 12, 2020, 3:48 PM Michael Tope wrote:
> There are a lot of SMT to DIP adapter boards out there which would allow
> newer SMD op-amps to be used in older through-hole PWB layouts.
>
>
> https://www.digikey.com/product-detail/en/aries-electronics/LCQT-SOIC8-8/A880AR-ND/4754588
This
FYI, I just found this page with many Dallas Lankford articles:
https://www.okdxf.eu/index.php/technika/80-antenarska-kolekce-dallase-lankforda
. Open the site in Chrome (or use translate.google.com), and it'll
translate from Czech to English.
On an old laptop here, I have many of his articles
There are some .ez antenna files included. One of them is a vertical with a
ground plane, which you can customize.
73, Mike
W0BTU
On Mon, Mar 9, 2020, 10:03 PM Chortek, Robert L. <
robert.chor...@berliner.com> wrote:
>
> I’ve just downloaded the demo version of EZNEC and I am working through
>
My experience too, Bill!
The very first time I tried my inverted-L with the two elevated radials
etc., I broke a number of pile-ups in a contest with 100 watts! At that
time, I did not have an amplifier that covered 160m.
After that, for awhile I made a game out of turning down the power output
I just started following the 630m and 2200m "#KHz" Slack Chat. It looks to
me like many CW folks have moved there. Some LF hams use CW there almost
exclusively, although there is a lot of narrowband digital there
(especially on 2200m).
It was kindly pointed out to me there by N03M and KB5NJD that
Many hams --including myself-- have had very good results using only a few
elevated radials.
This question contains an answer with a NEC 4.2 plot comparing the
efficiency of earth vs. elevated radials:
You mean like those $500 Pentagon toilets? ;-)
73, Mike
W0BTU
On Wed, Mar 4, 2020, 1:50 PM wrote:
> The 2N5109 is still being made today in the US. But it is a JAN part and
> it "ain't" cheap
> 73,
> N2TK, Tony
>
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