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Re: New file uploaded to ultralightdx

Rik
 

I do want to thank you for writing so many articles and also for answering so many questions for me.- FARMERIK


New file uploaded to ultralightdx

ultralightdx@...
 

Hello,


This email message is a notification to let you know that
a file has been uploaded to the Files area of the ultralightdx
group.


File : /5 Antennas and Equipment/A Polldoroff, 4 coil STLS antenna.pdf
Uploaded by : everettsharp74 <everettsharp@...>
Description : A Polldoroff, 4 coil Stacked Toroid Loop Stick antenna


You can access this file at the URL:
https://groups.yahoo.com/neo/groups/ultralightdx/files/5%20Antennas%20and%20Equipment/A%20%20Polldoroff%2C%204%20coil%20STLS%20antenna.pdf


To learn more about file sharing for your group, please visit:
https://help.yahoo.com/kb/index?page=content&y=PROD_GRPS&locale=en_US&id=SLN15398


Regards,


everettsharp74 <everettsharp@...>


Re: New file uploaded to ultralightdx

Everett N4CY
 

Guys,
 
I updated my old article "Experiments with a 7 1/2" FSL". I included wiring diagrams and some additional experiments.
 
Everett N4CY 
 
In a message dated 11/12/2015 3:25:30 P.M. Central Standard Time, ultralightdx@... writes:

 


Hello,

This email message is a notification to let you know that
a file has been uploaded to the Files area of the ultralightdx
group.

File : /Ferrite Sleeve Loop Antennas/Experiments with a 7.5 FSL.pdf
Uploaded by : everettsharp74
Description : Experiments with a 7 1/2" FSL using several coil comfigurations

You can access this file at the URL:
https://groups.yahoo.com/neo/groups/ultralightdx/files/Ferrite%20Sleeve%20Loop%20Antennas/Experiments%20with%20a%207.5%20FSL.pdf

To learn more about file sharing for your group, please visit:
https://help.yahoo.com/kb/index?page=content&y=PROD_GRPS&locale=en_US&id=SLN15398

Regards,

everettsharp74


New file uploaded to ultralightdx

ultralightdx@...
 

Hello,


This email message is a notification to let you know that
a file has been uploaded to the Files area of the ultralightdx
group.


File : /Ferrite Sleeve Loop Antennas/Experiments with a 7.5 FSL.pdf
Uploaded by : everettsharp74 <everettsharp@...>
Description : Experiments with a 7 1/2" FSL using several coil comfigurations


You can access this file at the URL:
https://groups.yahoo.com/neo/groups/ultralightdx/files/Ferrite%20Sleeve%20Loop%20Antennas/Experiments%20with%20a%207.5%20FSL.pdf


To learn more about file sharing for your group, please visit:
https://help.yahoo.com/kb/index?page=content&y=PROD_GRPS&locale=en_US&id=SLN15398


Regards,


everettsharp74 <everettsharp@...>


Re: New Multi-Band Radio - Kaito KA268

Rik
 

I have the Tecsun R-9012 which sells for about $20 and it is not loaded with images like MY KA268. The KA268 has much fuller audio and other advantages. Too bad mine has so many images.The continuous tone control knob works very well.   The other Tecsun I mentioned is the R9700DX which has been in production for probably 15 years. It sells for about $60 and is dual conversion on the SW bands, and like the KA268 has much fuller audio than the R-9012.

I do not have a local transmitter anywhere near my rural location in North East USA , so that does not explain the over loading or images here. I bought the KA268 hoping for a cheap radio to have in the car for SW while my wife shops. Because I wanted portable operation, I have not experimented with some sort of RF signal cut, and it might not overload in a low signal area, or as I said mine may be defective. I did also try connecting outdoor antennas which as you would expect had even more images. One thing I noticed is the whip seems to be connected to the AM band, unlike most portables except SONY radios. So it might be a candidate for a small  tuned loop antenna. It does not have an antenna jack, but maybe a ground connection could be found.

When I have time, I'll see what I can do with my KA268.- FARMERIK


Re: New Multi-Band Radio - Kaito KA268

josephrot
 

Other than the the Kaito KA-268 isn't worth it almost at any price, it sounds like the front-end is being overloaded by strong or nearby "powerful" AM stations, among other strong possibilities.
 
The Tecsun unit referenced in the messages -- I thinks it's the R-97DX -- has received other "it's nothing real special, but it actually works pretty well..." responses in other Groups and online. It may well be much more worth its asking price on the likes of eBay (US and UK), and I think it was seen on Amazon.com (US) as well.

Might be nice to see a "head to head" compare of both KA-268 and the Tecsun R-97DX ? 

Joe Rotello / Knoxville, TN / USA


A Little (more) Ultralight Hobby Promotion

K8HU and ex-NMN
 

A little promotion from the "Official SWL Channel"

https://youtu.be/3hMdRm-Wqo4



Chuck Rippel


Re: Polydorf 4 coil diagram needed-FARMERIK

Rik
 

I thought you had the alternately wound schematic in one of your articles, but the 7.5 FSL antenna displays on my computer with a blank page 6. and I see no wiring diagram in that fine article at all. Only exhaustive  tests of  2 and 4 coil FSLs.

 I do have the diagram you provided and the Polydorf Patent you added to other articles showing the diagram for a 4 coil with all wound in the same direction or 'handedness'.

I tried Google too, but couldn't find it that way either.

I just wanted to see which would be easier to wind with one uncut piece of Litz and a shuttle to go under the jumpers. I may end up with a 3 coil anyway.  -FARMERIK


Re: Polydorf 4 coil diagram needed-FARMERIK

Everett N4CY
 

I am not at home and won't be back until tomorrow evening. However, if you look in the files section for my article on experiments with a 7 1/2" FSL, I think you will find a diagram for a 4 coil Polydoroff. 

Everett N4CY


On Nov 11, 2015, at 12:00 PM, farmerik@... [ultralightdx] <ultralightdx@...> wrote:

 

I am looking for a diagram for the series  connection of the 4 coils which are ALTERNATELY  wound in opposite directions. I thought it was in the files here, but can only find the 3 coil and the 4 coil with all windings in the same direction.- FARMERIK



Polydorf 4 coil diagram needed-FARMERIK

Rik
 

I am looking for a diagram for the series  connection of the 4 coils which are ALTERNATELY  wound in opposite directions. I thought it was in the files here, but can only find the 3 coil and the 4 coil with all windings in the same direction.- FARMERIK



Re: New Multi-Band Radio - Kaito KA268

Rik
 

I have one, and it seems to have lots of images all over the SW bands, and AM tunes very oddly with unexpected stations on the dial too. Mine is defective I would say. That does not mean they all are. It is far less expensive than the R-9700DX which I think is a very good radio for the money, but my KA268 is not worth its $20 price. - FARMERIK


New Multi-Band Radio - Kaito KA268

Stephen H. Ponder <stephen_ponder@...>
 

Has anybody seen the Kaito KA268 AM/FM/SW receiver that's discounted on Amazon? It's described as a "12 Band World Receiver with AM/FM and 10 SW Bands 3.8 MHz - 22 MHz."


Here's a summary description of the KA268:
- Telescopic antenna is 28 inches (71 cm) long with 7 segments. The antenna is capable of rotating 360°.
- Radio has a "slide rule" dial (not digital).
- Right side of radio has a tuning knob (not a thumbwheel), a variable tone knob, and a variable volume knob (not digital).
- Left side of radio has an On/Off slide switch, a 3.5 mm headphone jack that delivers FM Stereo to the headphones/earbuds, and a DC In 6V jack (tip negative).
- There is a flip-out kickstand on the back of the radio, as well as a very small Time Zone map.
- Also on the back of the radio is a "Quick-Look" chart of the radio's frequency coverage:

FM: 88 - 108 MHz
AM: 520 - 1710 kHz
SW1: 3.80MHz - 4.10MHz 
SW2: 4.65MHz - 5.15MHz 
SW3: 5.85MHz - 6.40MHz 
SW4: 7.00MHz - 7.40MHz 
SW5: 9.30MHz - 10.00MHz 
SW6: 11.55MHz - 12.20MHz 
SW7: 13.50MHz - 13.90MHz 
SW8: 15.00MHZ - 15.70MHz 
SW9: 17.45 MHz - 18.10MHz 
SW10: 21.35MHz -22.00MHz

On the front of the radio in the upper left side of the radio's case are 3 LED indicators. These LEDs are labeled "FM", " AM", and "Tuning". The FM LED indicates that the radio is tuned to the FM Band. The AM LED indicates that the radio is tuned to the AM Band, and the Tuning LED serves as a signal strength indicator. The brighter the LED, the stronger the signal.

According to the Amazon review, the KA268 Noise Limited Sensitivity values are:

FM band < 10uV 
AM band < 1mV/m 
SW band < 30uV 

The KA268 has a front-firing speaker that is 57 mm (2.24 inches) in diameter.

Even though the radio has a 6V DC jack, a 6VDC "wall wart" does not come with the radio. The radio can be powered by 4 AA batteries, again not supplied with the radio. The literature I have seen does not indicate that the batteries may be charged inside the radio.

The KA268 is not a large radio. Again, according to Amazon, the radio's dimensions are 6 3/4 x 4 1/2 x 1 1/8 inches (17.145 x 11.43 x 2.858 cm) and weighs 11.9 ounces (337.36 grams).

Amazon is selling the KA268 for $19.95 with Prime 2-Day shipping. As Jerry Clower, famous Baptist comedian once said, this radio "'done flung a craving on me!!"

If anyone has experience with the KA268, please share with the group.

73 & Good DX,

Steve Ponder, N5WBI
Houston, TX

"Don't partner with jerks. It empowers them ... and leads people to make assumptions about you as well." - Ed Stetzer, (@edstetzer)

~~~~~~~~~~~~~~
Sent from my Kindle Fire 7


Re: Toroid Ferrite Loop Stick

Rik
 

Thanks. I guess the simplest way for me to proceed, is copy Everett's winding, and then experiment by having one or two if needed smaller coils wound. - FARMERIK


Re: Toroid Ferrite Loop Stick

John Bruckner
 

Ah, now you've found the difficulty in winding coils. What I do and have since I started winding, is keep a spreadsheet of what style of coil (diamondweave, basketweave,duolateral, etc.), diameter former I am using, the wire size, number of turns used for the inductance required.  Sure in the beginning, there was waste of wire but in the end it really helps.  If someone asks me for a coil at an inductance I don't have in my spreadsheet, then I still have to experiment to find that value between the ones I have on the spreadsheet.

 

The wire isn't wasted, I use it in other projects.

 

John

crystalradiocoils

 

From: ultralightdx@... [mailto:ultralightdx@...]
Sent: Tuesday, November 10, 2015 10:34 AM
To: ultralightdx@...
Subject: RE: [ultralightdx] Re:Toroid Ferrite Loop Stick

 

 

Thanks. That calculator looks the same as calculating speaker impedance once you know what it is. What I am trying to figure is how do I wind coils to get to a target uH.

Lets say for round numbers some one reported finding 20 turns gave 20 uH and I wanted 30 uH on the same ferrite.  If the progression was linear I could just wind 30 turns. But what if the change is not linear, and adding 10 turns makes far less or far more of a difference?- FARMERIK


Re: Toroid Ferrite Loop Stick

Rik
 

Thanks. That calculator looks the same as calculating speaker impedance once you know what it is. What I am trying to figure is how do I wind coils to get to a target uH.

Lets say for round numbers some one reported finding 20 turns gave 20 uH and I wanted 30 uH on the same ferrite.  If the progression was linear I could just wind 30 turns. But what if the change is not linear, and adding 10 turns makes far less or far more of a difference?- FARMERIK


Puyallup, WA Ultralight TP's for 11-10

Gary DeBock
 

Although this morning's sunrise session was another total clunker there were some healthy Asian signals to be found overnight-- if someone was willing to try for them from 0900-1015 UTC.
 
At 0910 the first of the energetic Japanese big guns appeared as 747-JOIB reached a good level in the Portland splatter. About 30 minutes later both 594-JOAK and 774-JOUB did the same, and the other NHK big guns on 693 and 828 were in and out of the noise with weak audio. Korea seemed to have been overlooked in the Asian sunset propagation, though, as neither 972 nor 1566 had come up with audio by 1015. By 1410 all of these had fizzled down to weak carrier level, of course, and even the ghostly carriers didn't care much for the negative sunrise enhancement. Although big gun Japanese audio isn't exactly thrilling the chance to hear healthy Asian signals in this lackluster month made the bizarre early morning session somewhat interesting.
 
73 and Good DX,
Gary DeBock (in Puyallup, WA, USA)
7.5" loopstick C.Crane Skywave Ultralight +
15" FSL antenna
 
 
 


Re: Toroid Ferrite Loop Stick

John Bruckner
 

Rik;

 

Try this site: keisan.casio.com/exec/system/1258035720  for inductance in series and parallel.

 

John

 

From: ultralightdx@... [mailto:ultralightdx@...]
Sent: Tuesday, November 10, 2015 8:58 AM
To: ultralightdx@...
Subject: Re: [ultralightdx] Re:Toroid Ferrite Loop Stick

 

 

Thanks- I do have an LC meter to test with. I guess my problem is I don't have accurate use of my hands or sharp vision, and my Radio repair guy, who is an expert on antique  tube equipment has never had interest in these types of antennas, so I'd have to pay him to experiment and come up with something which works. Maybe I'll ask him to wind a relatively small coil, measure it, and then decide how many to make which might add up in series near the 350 uH, but I have no idea what the number of turns I should specify for him to wind. Anyone here have a guess? If the ratio of turns to uH was linear, I would start with about half of what Everett used and go for 3 coils, to total around 350 uH, but if it is not a linear relationship, I am lost.  - FARMERIK


Re: Toroid Ferrite Loop Stick

Rik
 

Thanks- I do have an LC meter to test with. I guess my problem is I don't have accurate use of my hands or sharp vision, and my Radio repair guy, who is an expert on antique  tube equipment has never had interest in these types of antennas, so I'd have to pay him to experiment and come up with something which works. Maybe I'll ask him to wind a relatively small coil, measure it, and then decide how many to make which might add up in series near the 350 uH, but I have no idea what the number of turns I should specify for him to wind. Anyone here have a guess? If the ratio of turns to uH was linear, I would start with about half of what Everett used and go for 3 coils, to total around 350 uH, but if it is not a linear relationship, I am lost.  - FARMERIK


Re: Toroid Ferrite Loop Stick

Everett N4CY
 

It is s trial error process when using multi coils and with coils in parallel you will see a lower inductance than a single coil for the same frequency coverage. For coils in series the inductance will be about the same as a single coil. 

If you want different slide on coils you can take 1/2" thick poly foam and glue it together into cylinders using hot melt glue. The glue melts the poly enough that it will bond the two ends together. 

Everett N4CY


On Nov 9, 2015, at 4:52 PM, farmerik@... [ultralightdx] <ultralightdx@...> wrote:

 

As I try to read articles here, it looks like combining coils is not like combining speakers. It looks like the uH does not change the same way, and I see no obvious way to predict results at all. Is it entirely determined by experimenting and measuring uH with a meter? - FARMERIK


Re: Toroid Ferrite Loop Stick

Guy Atkins
 

One of the inductance meters I use is this this low cost, multi-function tester for only $21.97 with Amazon Prime shipping. At this price, anyone experimenting with antennas for their Ultralight radios can afford one:

Amazon.com: Yosoo GM328 LCD Display Transistor Tester ESR Meter Cymometer Square Wave Generator: Home Improvement

 

In the inductance range the unit measures from 0.01 mH to 20 H, and I have found it to essentially match my other inductance tester.

I've also used this for transistor identification and capacitor measuring, and it's great for that too.

73,

Guy Atkins
Puyallup, WA



---In ultralightdx@..., <jbruckner@...> wrote :

Rik;

 

For approx. $100, you can buy the same meter I use, AADE IIB for measuring inductance.

 

John

W0HII

 

 

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