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Re: Ferrite antenna design in older portable radios

Rik
 

A lot of European radios from my collection have unusual windings, and excellent performance, including radios with coils at both ends of the ferrite.
Some time ago I looked for internal  Online photos of PL-600 and PL-450 radios which are sharply directional. I could not see anything special about the windings on the ferrite.
I wish I knew!- FARMERIK


Ferrite antenna design in older portable radios

gary_thorburn <gwt@...>
 

I've accumulated portable radios dating from the 1950s to the present. I've noticed that in general, older radios were usually wound with the turns widely spaced.  I have an old 8-inch ferrite antenna with turns spread out nearly its entire length.  Modern radios typically have the turns closely spaced on a paper form positioned on the rod.  Anyone have ideas about what the difference would be?  I would expect the wider spaced turns would result in less capacitance in the coil, which I think would be a good thing.  But a closely wound coil on a paper form permits sliding the coil on the rod, positioning it for correct inductance. This permits some optimization at assembly time.  Incidentally, I have a working Philco portable, model B-631, from about 1954.  It has a 7-inch long, 17mm diameter ferrite, wound widely. (NOT an ultralight!)  A Philco ad for this radio claimed that it was the first commercially available portable using a ferrite antenna, which they called the "Magnecor".


Re: Jay is back reviewing! -FARMERIK

Rik
 

My guess is it was never meant for North America. I don't know what other parts of the world have MW up to 1710 KHz. I would guess it is intended for Asia, Africa or the Middle East, but that is just a guess. That may also be why 2 D cells which probably power the radio for around 350 hours, so places with out reliable electricity.

It's like a trip back in time.- FARMERIK


Re: Jay is back reviewing! -FARMERIK

Peter Laws
 

On Mon, Mar 4, 2019 at 11:14 AM Rik <farmerik@...> wrote:

Yes, it's not an ULR, but it is interesting to me anyway. I have a collection of a dozen or so 2 D cell portables.

https://radiojayallen.com/panasonic-rf-562d-retro-design-am-fm-sw-portable-radio/
Interesting radio. I wonder why it doesn't cover the entire "Standard
Broadcast"? Maybe they found a container of pre-1980s analog tuners
and decided to build a product instead of land-filling them?


--
Peter Laws | N5UWY | plaws plaws net | Travel by Train!


Jay is back reviewing! -FARMERIK

Rik
 

Yes, it's not an ULR, but it is interesting to me anyway. I have a collection of a dozen or so 2 D cell portables.

https://radiojayallen.com/panasonic-rf-562d-retro-design-am-fm-sw-portable-radio/


Re: Blog Gone

Paul Blundell
 

I will just update my links and focus on my new one. 


On Mon, 4 Mar 2019, 5:32 a.m. Phillip Fimiani via Groups.Io, <myamiphil=yahoo.com@groups.io> wrote:
The phrase is Indonisian... "There is nothing here." So they dumped it... Wonder if blogspot.com can delete it?

 
Best Regards
Phil
KD2HTN / WA2069SWL

______________________________

On Sunday, March 3, 2019, 5:55:38 AM EST, Paul Blundell <tanger32au@...> wrote:


Just a heads up, somebody has stolen my blog name.  https://theultralightradiodxer.blogspot.com

This is no longer ran by me,  I have been in the process of moving to a new blog but had not totally finished.  My blog can be found here: 

--
Paul - Moderator
UltralightDX

--
73
Phil
KD2HTN / WA2069SWL
Long: 34.210293 Lat:-78.057048
FM04xf 30dl


--
Paul - Moderator
UltralightDX


Re: Blog Gone

Phillip Fimiani
 

The phrase is Indonisian... "There is nothing here." So they dumped it... Wonder if blogspot.com can delete it?

 
Best Regards
Phil
KD2HTN / WA2069SWL

______________________________

On Sunday, March 3, 2019, 5:55:38 AM EST, Paul Blundell <tanger32au@...> wrote:


Just a heads up, somebody has stolen my blog name.  https://theultralightradiodxer.blogspot.com

This is no longer ran by me,  I have been in the process of moving to a new blog but had not totally finished.  My blog can be found here: 

--
Paul - Moderator
UltralightDX

--
73
Phil
KD2HTN / WA2069SWL
Long: 34.210293 Lat:-78.057048
FM04xf 30dl


Re: Blog Gone

Paul Blundell
 

Yeah I can't work out how it even happened. It must have been in the past few days. 


On Sun, 3 Mar 2019, 10:06 p.m. blumu via Groups.Io, <blumu=btinternet.com@groups.io> wrote:


On 03.03.19 10:55, Paul Blundell wrote:

> Just a heads up, somebody has stolen my blog name.
> https://theultralightradiodxer-dot-blogspot-dot-com
>
> This is no longer ran by me,  I have been in the process of moving to a
> new blog but had not totally finished.  My blog can be found here:
> https://airbandlisteningtasmania.blogspot.com
------------------------

Thanks  for the warning, Paul.

In order to garner subscriber info with nefarious intent,
pfishers often piggyback or usurp existing websites.
This is not always apparent, which is why it can
be "profitable" to pfishers.


Michael UK




--
Paul - Moderator
UltralightDX


Re: Blog Gone

Michael.2E0IHW
 

On 03.03.19 10:55, Paul Blundell wrote:

Just a heads up, somebody has stolen my blog name. https://theultralightradiodxer-dot-blogspot-dot-com
This is no longer ran by me,  I have been in the process of moving to a new blog but had not totally finished.  My blog can be found here:
https://airbandlisteningtasmania.blogspot.com
------------------------

Thanks for the warning, Paul.

In order to garner subscriber info with nefarious intent,
pfishers often piggyback or usurp existing websites.
This is not always apparent, which is why it can
be "profitable" to pfishers.


Michael UK


Blog Gone

Paul Blundell
 

Just a heads up, somebody has stolen my blog name.  https://theultralightradiodxer.blogspot.com

This is no longer ran by me,  I have been in the process of moving to a new blog but had not totally finished.  My blog can be found here: 

--
Paul - Moderator
UltralightDX


Re: August 2018 Rockwork Ocean Cliff (Oregon) DXpedition Article

Paul Blundell
 

Excellent report as always. 


On Sat, 2 Mar 2019, 5:41 a.m. David Edger, <dnedger@...> wrote:
Wow!  You guys really set the bar high for next time. My little PL380 has a lot of work to do. Thanks for the write up.

Cheers, Dave N3CI

 

From: main@ultralightdx.groups.io on behalf of KA5DWI Art via Groups.Io <ka5dwi=yahoo.com@groups.io>
Sent: Friday, March 1, 2019 8:13 AM
To: main@ultralightdx.groups.io
Subject: Re: [UltralightDX] August 2018 Rockwork Ocean Cliff (Oregon) DXpedition Article
 

Enjoyed it. Excellent work by you all.

Regards Art Jackson KA5DWI


--
Paul - Moderator
UltralightDX


Re: August 2018 Rockwork Ocean Cliff (Oregon) DXpedition Article

David Edger
 

Wow!  You guys really set the bar high for next time. My little PL380 has a lot of work to do. Thanks for the write up.

Cheers, Dave N3CI

 


From: main@ultralightdx.groups.io on behalf of KA5DWI Art via Groups.Io <ka5dwi@...>
Sent: Friday, March 1, 2019 8:13 AM
To: main@ultralightdx.groups.io
Subject: Re: [UltralightDX] August 2018 Rockwork Ocean Cliff (Oregon) DXpedition Article
 

Enjoyed it. Excellent work by you all.

Regards Art Jackson KA5DWI


Re: August 2018 Rockwork Ocean Cliff (Oregon) DXpedition Article

K7DWI Art
 

Enjoyed it. Excellent work by you all.

Regards Art Jackson KA5DWI


August 2018 Rockwork Ocean Cliff (Oregon) DXpedition Article

Gary DeBock
 

A plunging ocean side cliff, thunderous DU signals, awesome DXing companions and dazzling scenery-- who could ask for more?

Sandwiched in between an April DXpedition to the Cook Islands and a November trip to Kauai, Hawaii, the 9-day Rockwork Cliff DXpedition featured some exceptional signals, the largest-ever DXer contingent (5), a wacky boom in the squatter population and a bizarre search for antenna setup space each early morning in total darkness (right next to total strangers, more than a few of whom were pretty "strange"). Going through this bizarre routine for 9 days straight right next to the plunging cliff (500 feet straight down) is something that we will remember for quite a while.

Despite the challenges the South Pacific DX was more than enough compensation for our hassles, with DXpedition partner Tom Rothlisberger scoring the largest haul of Longwave South Pacific NDB's ever received on the west coast (55), while 558-Radio Fiji One and 1017-A3Z in Tonga managed the strongest signals I've ever heard recorded in North America. The ultra-rare Kiwi on 585 showed up for the first time in 4 years, while the Kiwis on 531, 594, 639, 657, 738 and 936 all managed their best-ever signals. Craig Barnes joined us for the first time, and Nick ran multiple tests of relative DU signal strength at the various turnoffs (while we carefully stayed in between his expensive gear and the squatters). Chuck and I were already Rockwork 4 veterans, but the squatters forced us to relocate to other turnoffs-- which actually provided involuntary relative signal strength test data. Overall the DXpedition was pretty thrilling-- in more ways than one. Full details, photos and MP3 recording links are provided in the 7 page DXpedition article posted at https://dreamcrafts.box.com/s/ci1n2tbcoh8gm8itrfee35rz93ggldv7

 

73 and Good DX,

Gary DeBock (DXing at the Rockwork ocean cliff near Manzanita, OR from August 1-9)


Re: Some Polydoroff tests- FARMERIK

Rik
 

I could not get the two types of 2 coil Polydoroff windings to be especially directional, or sensitive. I found a barefoot PL-450 was better completely separating two 5 KW stations on 560 AM in the evening and gave stronger signals with less noise. That is working with stranded #14 insulated wire for these experiments.

Because the 'new' ferrite requires more turns to reach the same uH, I was not able to assemble a 3 coil over ferrite to test in this smaller size. 1.6 X 3.5 inch  stack just under each  3 inch wide coil.

A few years ago I found a 3 coil over my 2.125 X 16 inch ferrite stack was sharply directional. By email I asked both Everett and Steve R. and neither had any idea why that may be.

I plan to buy more ferrite to go under a third coil in a couple weeks. Although my 3 coil is not exactly from the 2 coil  Polydoroff patents shown in files here repeatedly, it is some what similar as the cap or DSP chip is connected between the inner ends of the outer coils, and the contra coil in the center between the jumper from the outer ends of the side coils, so I think the cap is balanced between all three coils. In the files it says that would be the highest voltage point. I suppose that means the leads to the cap or DSP chip should not be close to each other, but that's just a guess.

I would welcome suggestions for things to try.

If the tests with stranded #14 and three Contra coils goes well, I plan to buy Litz hoping to improve it more. 660/46 Litz is slightly narrower than my #14, so I could add a few turns to each of the three coils in series for slightly more uH.

Steve R. found spacing the ferrites side to side  under coils on an FSL increased Q, so I may try that on the toroid stack. With out test gear, it may not be obvious if Q increases some what.

If I can't make the separated 3 coil design to work well, I can just wind a single coil of Litz over the stack and experiment with spacing the ferrite toroids underneath. -FARMERIK


Re: Radiwow R-108 Vs. Tecsun PL-380

Paul Blundell
 

It will be great to hear what you think of it.


On Wed, Feb 27, 2019 at 10:14 PM radiojayallen <radiojayallen@...> wrote:
I bit the bullet and ordered one...can't resist checking out a new radio!

Jay



--
Paul


--
Paul - Moderator
UltralightDX


Re: Radiwow R-108 Vs. Tecsun PL-380

jerry popiel
 


Thanks for your comments Max. 

Many of the Tecsun Ultralite Radios I have previously purchased - PL - 380, PL - 360 & PL - 398BT (Bluetooth) Radios -  All have a Intelligent Charging Function. These Radios use 3  - UM3 AA Rechargeable batteries - probably Nih batteries. My R6 / 1.2 Volt QN1000M AA Rechargeables were supplied by Tecsun for free with the Radio purchases. They don’t send them out anymore, but they are / were  available for purchase from Tecsun. Those Tecsun Radios ALL have a 5V External Adapter that uses a USB Plug to Charge the AA Rechargeable Batteries with them Inserted In The Radio!  In fact I have been using and Charging my FSL equipped PL - 380 with the AA Rechargeables for the past 10 years. And the AA’s do not have to be removed from the radio to be recharged. The newer Tecsun PL - 880 which uses the 18650 battery is a $290.00 CDN Funds radio but not too sure it would be considered an Ultralite due to it’s larger size. 

"The except explains all and you will see that new Tecsun models in the future will use 18650 or flat lithium batteries":
Please note the recently released new Tecsun PL - 680 Radio uses 4 - AA Batteries & also has a smart charging system. I agree that there are many Radios that do use the 5V lithium Battery Pack you mention, but are all new Radios going in this direction? I guess time will tell. 

Thanks
Jerry    

On Feb 27, 2019, at 3:25 AM, Max Italy <max2013@...> wrote:

Jerry, i have read you comment only now
"nearly every digital Tecsun radio generally uses AA batteries (except for their most expensive ones)"
The except explains all and you will see that new Tecsun models in the future will use 18650 or flat lithium batteries, remember what Max the idiot told you :D
The only reason why they have not switched to lithium batteries yet is just because they save money not supplying anymore the AA batteries that are widely available but now that more people consider the lithium battery a good buying point they will.


Re: Radiwow R-108 Vs. Tecsun PL-380

radiojayallen
 

I bit the bullet and ordered one...can't resist checking out a new radio!

Jay


Re: Radiwow R-108 Vs. Tecsun PL-380

Paul Blundell
 

The safest way to charge a battery is in an external charger.  I would rather have this damaged than a $800 radio. 


On Wed, 27 Feb 2019, 9:57 p.m. Max Italy, <max2013@...> wrote:
Paul i do not have to convince anybody, i just want to make things clear and not mixing one thing with another,  but remember that AA batteries are Ni-Mh batteries, so your concern is more about the form factor than the technology of the batteries.
Jerry is also confusing one thing with another because R6 is the same as AA, just different terms, and R6 1.2v lithium batteries simply do not exhist, they are Ni-Mh.

p.s. strange that the scanners litium batteries failed both. I have a $20 Baofeng radio that i used only for reception and i have charged only twice in one year. The battery is in its plastic sealed box and i have never seen them going bad in any device, cellphones included. There must be a major projectual problem with the charging unit.


--
Paul - Moderator
UltralightDX


Re: Radiwow R-108 Vs. Tecsun PL-380

Max Italy
 

Paul i do not have to convince anybody, i just want to make things clear and not mixing one thing with another,  but remember that AA batteries are Ni-Mh batteries, so your concern is more about the form factor than the technology of the batteries.
Jerry is also confusing one thing with another because R6 is the same as AA, just different terms, and R6 1.2v lithium batteries simply do not exhist, they are Ni-Mh.

p.s. strange that the scanners litium batteries failed both. I have a $20 Baofeng radio that i used only for reception and i have charged only twice in one year. The battery is in its plastic sealed box and i have never seen them going bad in any device, cellphones included. There must be a major projectual problem with the charging unit.

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