Re: results of new US antenna design - advice sought
No no, not a vertical. Horizontal orientation models only. There wasn't a name for this antenna in a 1958 article by? M. J. Heavyside, Ph.D (G2QM) he published theory and a report of his work.
So, others called it a variety of names. I wrote to UK hams abiut two years ago who sourced the article for me from their archives.??
N2VIP Which ARRL era publication would have published this??
So far the most apt name I have used in my modeling is non-inductive end-loaded antenna (NEDA)? comprising radiating and non-radatinv regions. Selecting 80m to 10m coverage I got 1ft H X 1ft w X 12ft L.?
L is horizontal dimension, total length.?
We made a third version of this system with a poly fabric embedded with antenna elements ... total dimensions 12ft L x 2.5ft W x 1 inch. It did work, better than others, but the wind blew the damn antenna post tripod over as we had created a sail that twists and turns with gusts. Well we have a lot of engineering to do on that one.?
Sorry I don't have any nice pictures to distribute as we are just experimenting with materials and all of our tests are cheaply made up of home depot products. The measurements are somewhat different between prototypes as we discover the cost of the parts we have to fabricate and make durable for long term outside use. It's should be a mature design for showing in a few months.?
73 de X
On Sun, Feb 19, 2023, 22:51 Ken N2VIP < ken@...> wrote: Apparently it's a type of vertical (1' x 1' x 12').
Is there a reason to think this design is not included in the ARRL publications of the era Ken, N2VIP ?What general type of antenna is it?
Joe n1khb
On Sun, Feb 19, 2023 at 9:39 PM, Samudra Hi, ? FT-817 QRP users, I am one of the developers of ?a modern incarnation of a very old design HF antenna (post WW2 apparently from the documentation I have) that was rediscovered/tested by other hams in the 70s-80s, and 90s. But then it was left alone AFAIK. We will soon have it on the air with my FT-817ND radio that I repaired a year plus ago, with the help of this forum members (Thank you). Our test cases will be SSB voice, and FT8 or other digital modes over a weekend coming up. Looking for regional contacts to try scheduled tests. ? In the DC/MD/VA region of US, I worked with a few business colleagues/ham radio operators to design/test/develop and fabricate working prototypes. Three versions are in testing now. What I am hoping is someone interested in antenna testing/fabrication will be able to indicate if what we are getting with an MFJ antenna analyzer and a MFJ antenna tuner (all we have in the field, but I have more equipment in my RF test lab ¨C not at the placed where the antenna is being fielded) is good or not: ? 3.750 MHz ~ 1.0-1.1 SWR 7.010 MHz ~ 1.1-1.2 SWR 14.200~250 MHz ¨C 1.3 SWR ¡ 28 MHz ¨C 1.2x SWR ? These were the first trials, with the fully assembled kit about 6 feet a.g.l. Total dimension is approximately: 1ft x 1ft x 12ft. It¡¯s a geometrically complex antenna design, that hurts most antenna analyzing software. We haven¡¯t got the lifting system in place to erect it safely to about 20 feet a.g.l. so this is the best we can do for now. ? Any comments on the statistics I am presenting welcome. I was not expecting so low SWR and we haven¡¯t tried with a live transceiver yet. But there are very distinct notches and our dimensions of the radiation region was even bang on from antenna modeling theory with some margin. Feeder was a 50 ohm coax to manual antenna tuner unit of about 25ft length. ? We are wondering if it would be interesting to any with small space for antennas? What are your thoughts and requirements on packaging/support/reliability ? It¡¯s becoming a challenge to source all parts at low cost and yet have good manufacturability and repeatability with the complex measurements mechanical and electrical per the design. ? 73 de N3RDX Washington, DC
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Re: results of new US antenna design - advice sought
Apparently it's a type of vertical (1' x 1' x 12').
Is there a reason to think this design is not included in the ARRL publications of the era Ken, N2VIP
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Show quoted text
On Feb 19, 2023, at 21:45, Joseph Wonoski via groups.io <N1KHB@...> wrote:
?What general type of antenna is it?
Joe n1khb
On Sun, Feb 19, 2023 at 9:39 PM, Samudra <samudra.haque@...> wrote: Hi, ? FT-817 QRP users, I am one of the developers of ?a modern incarnation of a very old design HF antenna (post WW2 apparently from the documentation I have) that was rediscovered/tested by other hams in the 70s-80s, and 90s. But then it was left alone AFAIK. We will soon have it on the air with my FT-817ND radio that I repaired a year plus ago, with the help of this forum members (Thank you). Our test cases will be SSB voice, and FT8 or other digital modes over a weekend coming up. Looking for regional contacts to try scheduled tests. ? In the DC/MD/VA region of US, I worked with a few business colleagues/ham radio operators to design/test/develop and fabricate working prototypes. Three versions are in testing now. What I am hoping is someone interested in antenna testing/fabrication will be able to indicate if what we are getting with an MFJ antenna analyzer and a MFJ antenna tuner (all we have in the field, but I have more equipment in my RF test lab ¨C not at the placed where the antenna is being fielded) is good or not: ? 3.750 MHz ~ 1.0-1.1 SWR 7.010 MHz ~ 1.1-1.2 SWR 14.200~250 MHz ¨C 1.3 SWR ¡ 28 MHz ¨C 1.2x SWR ? These were the first trials, with the fully assembled kit about 6 feet a.g.l. Total dimension is approximately: 1ft x 1ft x 12ft. It¡¯s a geometrically complex antenna design, that hurts most antenna analyzing software. We haven¡¯t got the lifting system in place to erect it safely to about 20 feet a.g.l. so this is the best we can do for now. ? Any comments on the statistics I am presenting welcome. I was not expecting so low SWR and we haven¡¯t tried with a live transceiver yet. But there are very distinct notches and our dimensions of the radiation region was even bang on from antenna modeling theory with some margin. Feeder was a 50 ohm coax to manual antenna tuner unit of about 25ft length. ? We are wondering if it would be interesting to any with small space for antennas? What are your thoughts and requirements on packaging/support/reliability ? It¡¯s becoming a challenge to source all parts at low cost and yet have good manufacturability and repeatability with the complex measurements mechanical and electrical per the design. ? 73 de N3RDX Washington, DC
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Re: results of new US antenna design - advice sought
What general type of antenna is it?
Joe n1khb
On Sun, Feb 19, 2023 at 9:39 PM, Samudra <samudra.haque@...> wrote: Hi, ? FT-817 QRP users, I am one of the developers of ?a modern incarnation of a very old design HF antenna (post WW2 apparently from the documentation I have) that was rediscovered/tested by other hams in the 70s-80s, and 90s. But then it was left alone AFAIK. We will soon have it on the air with my FT-817ND radio that I repaired a year plus ago, with the help of this forum members (Thank you). Our test cases will be SSB voice, and FT8 or other digital modes over a weekend coming up. Looking for regional contacts to try scheduled tests. ? In the DC/MD/VA region of US, I worked with a few business colleagues/ham radio operators to design/test/develop and fabricate working prototypes. Three versions are in testing now. What I am hoping is someone interested in antenna testing/fabrication will be able to indicate if what we are getting with an MFJ antenna analyzer and a MFJ antenna tuner (all we have in the field, but I have more equipment in my RF test lab ¨C not at the placed where the antenna is being fielded) is good or not: ? 3.750 MHz ~ 1.0-1.1 SWR 7.010 MHz ~ 1.1-1.2 SWR 14.200~250 MHz ¨C 1.3 SWR ¡ 28 MHz ¨C 1.2x SWR ? These were the first trials, with the fully assembled kit about 6 feet a.g.l. Total dimension is approximately: 1ft x 1ft x 12ft. It¡¯s a geometrically complex antenna design, that hurts most antenna analyzing software. We haven¡¯t got the lifting system in place to erect it safely to about 20 feet a.g.l. so this is the best we can do for now. ? Any comments on the statistics I am presenting welcome. I was not expecting so low SWR and we haven¡¯t tried with a live transceiver yet. But there are very distinct notches and our dimensions of the radiation region was even bang on from antenna modeling theory with some margin. Feeder was a 50 ohm coax to manual antenna tuner unit of about 25ft length. ? We are wondering if it would be interesting to any with small space for antennas? What are your thoughts and requirements on packaging/support/reliability ? It¡¯s becoming a challenge to source all parts at low cost and yet have good manufacturability and repeatability with the complex measurements mechanical and electrical per the design. ? 73 de N3RDX Washington, DC
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Re: results of new US antenna design - advice sought
Can you ship a picture or drawing. Would help to visualize. Also forwarded to another group of smarter hams.?
W4DBL?
Doug Lynch
President?
Aries International, LLC
?
D: +1-321-415-2191
M:?+1-478-318-2655
?
E: Doug@...?
Port Orange, FL
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Show quoted text
On Feb 19, 2023, at 21:39, Samudra via groups.io <samudra.haque@...> wrote:
?
Hi,
?
FT-817 QRP users, I am one of the developers of ?a modern incarnation of a very old design HF antenna (post WW2 apparently from the documentation I have) that was rediscovered/tested by other hams in the 70s-80s, and 90s. But then it was
left alone AFAIK. We will soon have it on the air with my FT-817ND radio that I repaired a year plus ago, with the help of this forum members (Thank you). Our test cases will be SSB voice, and FT8 or other digital modes over a weekend coming up. Looking for
regional contacts to try scheduled tests.
?
In the DC/MD/VA region of US, I worked with a few business colleagues/ham radio operators to design/test/develop and fabricate working prototypes. Three versions are in testing now. What I am hoping is someone interested in antenna testing/fabrication
will be able to indicate if what we are getting with an MFJ antenna analyzer and a MFJ antenna tuner (all we have in the field, but I have more equipment in my RF test lab ¨C not at the placed where the antenna is being fielded) is good or not:
?
3.750 MHz ~ 1.0-1.1 SWR
7.010 MHz ~ 1.1-1.2 SWR
14.200~250 MHz ¨C 1.3 SWR
¡
28 MHz ¨C 1.2x SWR
?
These were the first trials, with the fully assembled kit about 6 feet a.g.l. Total dimension is approximately: 1ft x 1ft x 12ft. It¡¯s a geometrically complex antenna design, that hurts most antenna analyzing software. We haven¡¯t got the
lifting system in place to erect it safely to about 20 feet a.g.l. so this is the best we can do for now.
?
Any comments on the statistics I am presenting welcome. I was not expecting so low SWR and we haven¡¯t tried with a live transceiver yet. But there are very distinct notches and our dimensions of the radiation region was even bang on from
antenna modeling theory with some margin. Feeder was a 50 ohm coax to manual antenna tuner unit of about 25ft length.
?
We are wondering if it would be interesting to any with small space for antennas? What are your thoughts and requirements on packaging/support/reliability ? It¡¯s becoming a challenge to source all parts at low cost and yet have good manufacturability
and repeatability with the complex measurements mechanical and electrical per the design.
?
73 de N3RDX
Washington, DC
|
results of new US antenna design - advice sought
Hi, ? FT-817 QRP users, I am one of the developers of ?a modern incarnation of a very old design HF antenna (post WW2 apparently from the documentation I have) that was rediscovered/tested by other hams in the 70s-80s, and 90s. But then it was left alone AFAIK. We will soon have it on the air with my FT-817ND radio that I repaired a year plus ago, with the help of this forum members (Thank you). Our test cases will be SSB voice, and FT8 or other digital modes over a weekend coming up. Looking for regional contacts to try scheduled tests. ? In the DC/MD/VA region of US, I worked with a few business colleagues/ham radio operators to design/test/develop and fabricate working prototypes. Three versions are in testing now. What I am hoping is someone interested in antenna testing/fabrication will be able to indicate if what we are getting with an MFJ antenna analyzer and a MFJ antenna tuner (all we have in the field, but I have more equipment in my RF test lab ¨C not at the placed where the antenna is being fielded) is good or not: ? 3.750 MHz ~ 1.0-1.1 SWR 7.010 MHz ~ 1.1-1.2 SWR 14.200~250 MHz ¨C 1.3 SWR ¡ 28 MHz ¨C 1.2x SWR ? These were the first trials, with the fully assembled kit about 6 feet a.g.l. Total dimension is approximately: 1ft x 1ft x 12ft. It¡¯s a geometrically complex antenna design, that hurts most antenna analyzing software. We haven¡¯t got the lifting system in place to erect it safely to about 20 feet a.g.l. so this is the best we can do for now. ? Any comments on the statistics I am presenting welcome. I was not expecting so low SWR and we haven¡¯t tried with a live transceiver yet. But there are very distinct notches and our dimensions of the radiation region was even bang on from antenna modeling theory with some margin. Feeder was a 50 ohm coax to manual antenna tuner unit of about 25ft length. ? We are wondering if it would be interesting to any with small space for antennas? What are your thoughts and requirements on packaging/support/reliability ? It¡¯s becoming a challenge to source all parts at low cost and yet have good manufacturability and repeatability with the complex measurements mechanical and electrical per the design. ? 73 de N3RDX Washington, DC
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Re: FS W4RT One Board Filter OBF-817
Complete with both filters on board, already sold?
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Re: FS W4RT One Board Filter OBF-817
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Re: FS W4RT One Board Filter OBF-817
Saad did you sell this?? More info please too alpinewarren@...?if not 73!? AB6YA
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Those particular driver FET's ae easy to replace. They are surface-mount, but they are SOT-89 cases. Just use some solder wick and the edge of an X-Acto knife to pry the part loose while heating the soldered pins.
The FT-817 uses 2SK2975 FET's as the main power output devices. THOSE are quite a bit more difficult to replace, as they are soldered underneath the device. Probably requires a small heat gun to remove a bad device and solder in a new one. The FT-857 and FT-897 put out a lot more power, so those use the 2SK2975 as the drivers and the 2SK2973 as pre-drivers.
73, Zack W9SZ
On Fri, Feb 17, 2023 at 1:59 PM Steven Greenfield AE7HD via <alienrelics= [email protected]> wrote:
It's the drivers I'm replacing, not the finals. But I figured I'd be checking/setting the currents for the drivers, predrivers, and outputs, since I have no idea why these drivers burned up.
--
Steven J Greenfield AE7HD
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I also discovered the audio output is very weak, so this radio has multiple issues. Still waiting on the drivers, then I'll scope out the audio problem.
Not excited that it uses a surface mount audio output that is packed in tight. Not ordering any more parts until I confirm where the audio problem is at.
--
Steven J Greenfield AE7HD
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It's the drivers I'm replacing, not the finals. But I figured I'd be checking/setting the currents for the drivers, predrivers, and outputs, since I have no idea why these drivers burned up.
--
Steven J Greenfield AE7HD
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Hi
CW Filter, Collins Mechanical filter , plug in 500 HZ for the FT-817, $195 shipped??
73 Saad N5FF
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Re: Unable to skip memory channel in scan
your manual is only ten years old?
Oh, you have one of the 'modern ones'?
Or a replacement?
Mine is more than 20 years old, as my FT-817 (non ND!) is.?
Hi Hi , and having a good time with your FT-817, one of the most versatile TRX in the world! I
only use my FT-991, when QRP will not work!
And QRP will work for 80% what I do, on HAM-radio. My antennas are the best 'amplifier' I have!
More then the 600W out of my old darling, my FL-2100Z.
But in conjunction, it's an adorable and excellent 'trio', antenna, PA, and my FT-991.
But why use it, if it is not nessecary? In CW and 'digital mode' 5W are most of the times enough, ... most of the times ... !
Normaly, no need for 100W, or even more ... (+600W)
My FT-817 was a 'Eier-legende-Woll-Milch-Sau', when it appeared in 2000, like we in DL say, ... !?
(egg laying, wool giving, milk spending kind of a pig, ... !)?
73 de Markus - db9pz?
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Re: Unable to skip memory channel in scan
You've got "Supply Voltage Display" on (page 18 in the 817nd manual). The setting?is in the CHG, VLT, DSP row of the display selections. Press the F key, turn the SEL knob to the "CHG, VLT, DSP" choice, and press the B key to turn VLT off.
Not at all clear in the 10 year old manual.? I'd seen it before, but it's been a long time.? Hope this helps! 73, Jeff kn8a
On Sun, Feb 12, 2023 at 10:44 PM K3VIN < ka8yiu@...> wrote: [Edited Message Follows]
I am reading the manual for the FT-817 to skip a memory channel from my scan, but there is one issue with it: The channel number, as described, is not showing, only the current input voltage. Therefore, I cannot change between the dot and the hyphen as described in the manual:
Scan Skip Programming (Memory Mode Only)
Among the memories you have programmed, there may be some stations which you do not
wish to scan. For example, broadcast signals (which are transmitted continuously) will cause
the scanner to stop, and such channels may be skipped so as to avoid this inconvenience.
To remove a channel from the scanning loop:
1. Press the key momentarily, then rotate the knob, as needed, until Operating
Function Row 2 [MW, MC, TAG] appears on the display.
2. Recall the memory channel to be skipped.
3. Press the (MC) key momentarily. The "hyphen" in the
memory channel number will change to become a "dot"; this
shows that this channel now is not included in the scanning loop.
4. Repeat steps 2 and 3 as many times as necessary to skip all the
channels you do not wish to scan.
5. Initiate memory scanning; you will observe that the channels
you marked to be skipped are not included in the scanning loop.
6. Press the PTT switch to stop the scan; you may now use the knob to step through
the channels manually - one at a time - and you will observe that the "Skipped" channels
are, nonetheless, available for recall by manual means.
7. You may restore a previously-skipped channel to the scanning loop by selecting the
channel manually, then pressing the (MC) key momentarily so that the "dot" changes
to become a "hyphen."
Menu #34 is been changed between ON and OFF, but no change.
Kevin, K3VIN
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Good afternoon to the group,
I have been able to acquire the English language copy that I was looking for, I want to thank everyone who replied and to the group as a whole for letting me post, you are a fantastic group!
Vy73,
Rick VE1RNM?
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Re: Ft818nd new rechargeable battery pack
Thanks for your suggestion Ken, I will consider those options if no one wants the battery pack.
By 73,
Rick VE1RNM?
On Fri., Feb. 10, 2023, 10:55 a.m. Ken N2VIP, < ken@...> wrote: I've been very happy with having a local print shop print up online Radio manual PDFs, typically costs about $20US and has a spiral binding, vinyl backing and a clear cover.
I use FedEx Kinkos here in Texas, I'm certain you have something similar near you.
Another alternative might be that the printed manual can probably be ordered from Yaesu as a 'replacement part.' Ken, N2VIP ? Good?morning to the group,
I purchased a new FT 818nd from Wimo in Germany in January of this year and have no interest in using the original rechargeable battery that is included with the radio. I would like to trade it for an English language copy of the 818ND Manuel as the one included is in German, yes I have downloaded a copy but I'd like to have a paper copy. Anyone interested in doing this trade, let me know, the battery is brand new and still in bubble?wrap. Thanks!
Vy73,
Rick
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Re: Ft818nd new rechargeable battery pack
I've been very happy with having a local print shop print up online Radio manual PDFs, typically costs about $20US and has a spiral binding, vinyl backing and a clear cover.
I use FedEx Kinkos here in Texas, I'm certain you have something similar near you.
Another alternative might be that the printed manual can probably be ordered from Yaesu as a 'replacement part.' Ken, N2VIP
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On Feb 10, 2023, at 07:52, VE1RNM <rickmoskovits@...> wrote:
? Good?morning to the group,
I purchased a new FT 818nd from Wimo in Germany in January of this year and have no interest in using the original rechargeable battery that is included with the radio. I would like to trade it for an English language copy of the 818ND Manuel as the one included is in German, yes I have downloaded a copy but I'd like to have a paper copy. Anyone interested in doing this trade, let me know, the battery is brand new and still in bubble?wrap. Thanks!
Vy73,
Rick
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Ft818nd new rechargeable battery pack
Good?morning to the group,
I purchased a new FT 818nd from Wimo in Germany in January of this year and have no interest in using the original rechargeable battery that is included with the radio. I would like to trade it for an English language copy of the 818ND Manuel as the one included is in German, yes I have downloaded a copy but I'd like to have a paper copy. Anyone interested in doing this trade, let me know, the battery is brand new and still in bubble?wrap. Thanks!
Vy73,
Rick
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Re: gave up and bought a edu windows computer /// Re: FT817 and iPad??
You are absolutely?right Chuck Cole.
On Mon, Feb 6, 2023, 9:18 AM Chuck Cole K4TZO < cncole@...> wrote: All Windows gurus I know won't put Win 11 in anything. Two reasons: 1) causes incompatibilities with many major SW packages, forcing purchases of new SW, and 2) not yet bug-free and won't be until out for several years. I recommend that you go back to Win 10 ASAP. Has no known benefit over Win 10 and known liabilities.
On Mon, Feb 6, 2023, 8:26 AM Don N4RRT < n4rrt@...> wrote: Timely ¡ I just purchased the 128GB version of that education/rugged laptop for exactly that application: POTA and portable operation with my FT-817 and BitX-based home-brew rig.?
I purchased mine from Microcenter:?
All the windows HR software installed easily (as expected) ¡ I also have the Arduino IDE as well as the latest Python distributions installed ¡ plenty of room and reasonable performance.? Spyder, a computational sciences/scientific application focused cross-platform IDE is a little slow to start, but once going has reasonable performance.? N1MM+ works great too.?
My laptop also included a free upgrade to Windows 11, that also installed easily. ?
So, why?? I wasn¡¯t happy with using my RaspberryPi for portable ops ¡ was a little kludgy with the VNCapp on my iPad etc ¡ a cheap windows computer just seemed easier and more compact.? Also, my objective was low friction portable operations, not exploring linux, using a RPi, etc.? So after a bit of playing around with the RPi option, snagged the laptop when I saw it.?
?The little edu laptop works just as well with the FT-817 as my desktop Win 10 machine in the shack does with my shack radios.? Compared to the RPi, a lot less to tinker with to get out of the backpack and on the air portable as well.? Again, this is all about your preference ¡?
NB: I¡¯ve not used the laptop yet with my homemade opto interface to my homebrew rig, but assume is should work fine as well. ?
Most of all, have fun! Don N4RRT
--
73,
Don
N4RRT
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Re: gave up and bought a edu windows computer /// Re: FT817 and iPad??
Agree on HR SW for windows, but MS is not open source either. As a matter of fact, some of the core Apple software (Darwin) is open source.?
But none of that matters. A platform that runs the software one needs reliably does.?
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Doug Lynch NNJ4EM
Markus