Date   

Re: Tecsun PL-360 Commercial 200mm Plug-in Upgrade Antenna

bsaylor@...
 

I came to this party late, having seen the video posted on the SWLing.com blog last week. I looked at the large ferrite antenna on ebay but decided to try to build one. The small PL-360 replacement antenna arrived quickly from Anon-Co, and I used a surplus Russian 10x120mm ferrite rod that I bought several years ago on ebay. I re-used the Litz wire from the original antenna and found that it took about 25 fewer turns to reach the same inductance with the larger rod as the original antenna measured (about 330 uH). I used Guy's trick of turning the belt clip around and tie-wrapped the antenna to that to make it secure. The increase in signal strength from this larger antenna is indeed remarkable. In all it took about an hour to construct - a nice Friday evening project that went smoothly. Thanks for the information!

Brett Saylor
W3SWL
State College, PA


Which is more important, coil dia. or ferrite width?

Rik
 

For ferrite core loop antennas, which is more important for maximum sharp directivity. Ferrite width or coil diameter? - FARMERIK



Re: 3" Bar FSL Tecsun PL-380 Model-- "Heathkit-like" Construction Article

Gary DeBock
 

Thanks Tony,
 
The 15-page construction article apparently didn't end up in its original form with the Box.com upload, so please use the link below to download the entire article. All others on the list who wish to download the article should also use the following link, rather than the jumbled Box.com document
 
 
73, Gary
 
 
 

-----Original Message-----
From: Tony Magon
To: d1028gary
Sent: Thu, Jan 14, 2016 10:58 pm
Subject: Re: 3" Bar FSL Tecsun PL-380 Model-- "Heathkit-like" Construction Article

Thanks for the article Gary. Have sent you $20 via PayPal. Am at work at the moment and will download and print the article tonight
Regards
Tony
Tony


3" Bar FSL Tecsun PL-380 Model-- "Heathkit-like" Construction Article

Gary DeBock
 

Hello All,
 
For those who want to experience breakthrough MW-DXing capability in a portable receiver, the all-new 3" Bar FSL Tecsun PL-380 model has been designed. With the triple advantage of superior FSL antenna sensitivity, razor-sharp DSP selectivity and a powerful audio amplifier, this hand-held model has been designed to outperform any stock portable on the planet in DXing capability.
 
Featuring the first hard-wired FSL antenna to be used in a portable configuration, the PL-380's internal DSP chip (the Silicon Labs' Si4734) tunes the lightweight 3" Bar FSL antenna for maximum sensitivity throughout the MW band, freeing the DXer from the need to peak a variable capacitor. The FSL's cylindrical shape also provides the bonus function of superior nulling capability, as well as greatly improved Longwave performance relative to the stock model.
 
Long-term technical friend Steve Ratzlaff has also built one of these little monsters, and has reported that there is "no comparison" between its DXing performance and that of either the stock PL-380 model or a 7.5" loopstick transplant PL-380 model. For those interested, a full "Heathkit-like" construction manual (15 pages long) with detailed construction photos is posted at  https://app.box.com/s/aq40d24dt7yawrf8qvi2zehoi8evej3g   Although there is current shortage of the 100mm x 20mm x 3mm ferrite bars, I do still have a limited stock on hand, and can provide a few more sets at my own cost ($25 for a set of 8 bars, including shipping to the USA). But please do not request these bars unless you seriously plan to build the model, since there is currently an extreme demand for these (the last eBay source disappeared while the model was being designed, although many more are still believed to be in stock in eastern Europe).
 
73 and Good DX,
Gary DeBock (in Puyallup, WA, USA)


Re: What can I hear in Cuba? – Multi-band radio for receiving the news in Havana

M
 

After being nearly 6 months in Havana, here my report.

During the first weeks, I lived in a downhill apartment in Vedado with bad reception conditions. I never got more than 16 FM transmissions and more than 20-25 SW receptions. After I moved to another location, the situation changed. Now I'm living on a relatively high point of the city with a rooftop terrace on the hill near the university, ca. 1km away from the open sea.

I listened many hours during internet-free nighttime, overall conditions didn't change too much over the course of the months.

First of all: I never received any foreign FM or MW transmission. Never. And I don't know why.

On Shortwave I usually receive between 45 and 50 different stations (record: 52).
many christian US-Stations (like 3215, 4840, 5935 and more). Unfortunately, these were nearly the only english-speaking transmissions I got at all. With some exceptions: Some days I managed to receive Radio China Int. on 9790 and 9570 and also Radio Rumania Int on 9730 and Radio Slovakia Int. on 5850.

I also received Radio France Int on 7390 and some Asian transmission on 6020.
I also got arabic broadcast on 9420 as well as non-cuban spanis broadcasts on 6175 and 5025. 

Once (and only once) I managed to receive a voice nearly from home: Ö1, from Austria, transmitting in german language on 6155 / 6157.

On the FM band I managed to receive lots of Cuban stations, 18 in total, from different Provinces (Habana, Artemisa, Mayabeque, Pinar del Río and Matanzas at least and all cristal-clear).

Most easily available are of course Radio Habana, Rebelde, Progreso, Taíno and Reloj.

All in all one can say that it's pretty hard to inform yourself via english- language broadcast about the world via Radio in Cuba. Forget the FM band. If only all the SW christian US-Stations would transmit valuable information, this would be a game-changer because they're easy to tune in and usually very clear while the rest is very rare and more or less by chance.

If I really wanna information, it's easier to get with my smartphone / laptop to the street, pay 2 US$ for one hour of internet and enjoy everything from BBC to german newspapers.

Nevertheless it was a interesting experience and I hope I could contribute somewhat with this report.



Re: Litz wire

Rik
 

Thanks, that was just a guess. I recently used 660/46 on my 3 coil Polydorof. -FARMERIK


Re: Litz wire

Will <will_k53@...>
 

Hi Farmerik,

Checking mkmak222 list there doesn't seem to be any  at 1/3 of another. and using 100/330 the size is definitely bigger.  Two 100/46 are 1.32mm and one 330/46 is 1.22mm.  660/46 is 1.76mm so two 330/46 would be much wider.

Don't know how much twisting would reduce the space required, if at all.

Cheers,
Will

On 10/01/16 12:48, farmerik@... [ultralightdx] wrote:
 

Not sure, just guessing, wouldn't three windings of smaller Litz take up more space than one of a higher count? Maybe not. -FARMERIK



WBOB 600 FL Test L&C in Alabama

Les Rayburn
 

WBOB, Jacksonville, FL 600 KHz DX Test was easy copy here on car radio. Content consisting of log sweep tones, “off hook” telephone sounder, slow speed (5WPM) CW ID’s, computer-generated female voice ID’s “This is a Test. WBOB Jacksonville, Florida”, game show music “Price is Right”, “America the Beautiful”, faster (8-10 WPM) CW ID’s, etc.

Great test and I’m sure it was well heard. Thanks to everyone involved in arranging this. Super to hear a DX test so early in 2016! Hope there are many more to come.

Heard here in Alabaster, AL (near Birmingham)

73,



Les Rayburn, N1LF
Marlene, AL
EM63nf

Member WTFDA, IRCA, NRC. Former CPC Chairman for NRC & IRCA.


AM DX 1/10/16

D R
 

DXing am heard WCCO 50K Minneapolis & nulled out that signal & caught WTRU Kernersville, NC 10K both 830 am using CCrane Skywave DSP radio


D Raff



WBOB 600 FL Test L&C in Indiana

Dave Hascall
 

Thought that it was starting at 0600 UTC but no matter, saw the initial emails rolling in and headed to a quiet spot.  Strong w/Sweep Tones and such, Price is Right theme and an ID at 0054.  Thanks to all!

600 WBOB FL Jacksonville 1-10 0052 Strong w/sweeps, game show mx and ID at 0054. Way over 600 pest WMT and plasmna TV noise.  New!  Thanks to all!  DH-IN

Dave Hascall Indianapolis IN Eton e100 barefoot Time = EST



Re: Litz wire

Rik
 

Not sure, just guessing, wouldn't three windings of smaller Litz take up more space than one of a higher count? Maybe not. -FARMERIK


Re: Litz wire

Will <will_k53@...>
 

Thanks Steve,

Seems logical but I wasn't sure.  Buy 100 ft of smaller wire and triple it, cheaper than either buying by the foot or having 2/3 roll "surplus"

Cheers,
Will.

On 09/01/16 13:36, Steve Ratzlaff ratzlaffsteve@... [ultralightdx] wrote:
 

Hi Will,
I've had an HP 4342A Q meter for a number of years and have done lots of tests with Litz. I would say that you should expect "near" results doing what you ask about. (The same can be achieved winding them in parallel, not twisted together, and connecting them at the ends, too.) I believe the main benefit comes from reducing the AC resistance, whether using in parallel or twisted.
73,
Steve

On 1/8/2016 4:52 PM, Will will_k53@... [ultralightdx] wrote:
 

Hi Folks,

When you use several litz wires twisted together does it work as if it
was that many strands in one.as regards Q and inductance? There would
be some difference in capacitance. What other effects/differences would
there be.

Take 3 200/46 wires. twist together then wind a coil, do the same
number of turns wound from 600/46 is it the same, near or nowhere near?

Cheers,
Will




Re: Soldering Litz Wires.

John Bruckner
 

Or use a solder pot.

John, W0HII

 

From: ultralightdx@... [mailto:ultralightdx@...]
Sent: Saturday, January 09, 2016 4:32 AM
To: ultralightdx@...
Subject: Re: [ultralightdx] Soldering Litz Wires.

 

 

Use a good 40 watt soldering iron and good rosin core solder. Heat the Litz wire and start applying the solder, it will burn off the varnish and start taking the solder. Then wipe the wire with a rag and apply more solder and wipe again. 

Everett N4CY


On Jan 9, 2016, at 4:24 AM, ronelltom@... [ultralightdx] <ultralightdx@...> wrote:

 

Hi,

Is there an easier way to solder Litz wire other that 'scraping' it hoping you have exposed enough copper to take solder and thereby connect to a 'solder pad' on a circuit board please.....73s....Ron


Re: Soldering Litz Wires.

Everett N4CY
 

Use a good 40 watt soldering iron and good rosin core solder. Heat the Litz wire and start applying the solder, it will burn off the varnish and start taking the solder. Then wipe the wire with a rag and apply more solder and wipe again. 
Everett N4CY


On Jan 9, 2016, at 4:24 AM, ronelltom@... [ultralightdx] <ultralightdx@...> wrote:

 

Hi,

Is there an easier way to solder Litz wire other that 'scraping' it hoping you have exposed enough copper to take solder and thereby connect to a 'solder pad' on a circuit board please.....73s....Ron


Soldering Litz Wires.

ronelltom@...
 

Hi,

Is there an easier way to solder Litz wire other that 'scraping' it hoping you have exposed enough copper to take solder and thereby connect to a 'solder pad' on a circuit board please.....73s....Ron


Re: 3 Inch FSL Tecsun PL-380 Model-- Construction Parts Required

Michael <michael.setaazul@...>
 

Thanks for the response, Gary.
When the construction details are available,
I guess I could try a mod of the unattached 3" FSL.
That would have the compensation of being able
to rotate the FSL whilst keeping the PL380 fixed
with the display best visible.

The downside here in Europe is that there are
ever fewer stations on AM. France and Germany
closed down MW over New Year. France may close
LW at the end of 2016. Germany already did so.

Other countries, including the UK, are scheming (sic!)
to follow suit... There just might be a re-think following
the flooding in the north of the UK. Digital services were
affected due to local power interruption, whereas AM radio
was able to continue coverage from further away.

Michael


Original Message -----

Hello Michael,

<<< Gary, when you compile the construction details, please
include some indication of modification for using round ferrites,
such as scavenged from old AM bedside radios. One would
need more rods and a different number of turns of the litz.
With some indication I could first try with magnet wire to get
an idea of the number of turns of the precious litz required. >>>

Unfortunately, Michael, substituting any type of ferrite rods for the lightweight bars in the
3" FSL design would make the resulting antenna too top-heavy and impractical for a
glue bond with the PL-380 cabinet. Lightweight FSL design is imperative for any hope of success in
this aspect.

If you are not planning to attach your FSL (and frame) directly to the PL-380 cabinet then
you can hook up almost any type of antenna that you wish to the circuit board connection points
(within the recommended inductance range of 180-450 uH) and presumably enjoy
increased sensitivity over the stock loopstick. The drawback of this approach is
that the combination would lack portability, one of the primary objectives of the 3" Bar FSL PL-380
project.

73, Gary DeBock (in Puyallup, WA, USA)


Re: Litz wire

Steve Ratzlaff
 

Hi Will,
I've had an HP 4342A Q meter for a number of years and have done lots of tests with Litz. I would say that you should expect "near" results doing what you ask about. (The same can be achieved winding them in parallel, not twisted together, and connecting them at the ends, too.) I believe the main benefit comes from reducing the AC resistance, whether using in parallel or twisted.
73,
Steve

On 1/8/2016 4:52 PM, Will will_k53@... [ultralightdx] wrote:
 

Hi Folks,

When you use several litz wires twisted together does it work as if it
was that many strands in one.as regards Q and inductance? There would
be some difference in capacitance. What other effects/differences would
there be.

Take 3 200/46 wires. twist together then wind a coil, do the same
number of turns wound from 600/46 is it the same, near or nowhere near?

Cheers,
Will



Litz wire

Will <will_k53@...>
 

Hi Folks,

When you use several litz wires twisted together does it work as if it
was that many strands in one.as regards Q and inductance? There would
be some difference in capacitance. What other effects/differences would
there be.

Take 3 200/46 wires. twist together then wind a coil, do the same
number of turns wound from 600/46 is it the same, near or nowhere near?

Cheers,
Will


Re: 3 Inch FSL Tecsun PL-380 Model-- Construction Parts Required

Gary DeBock
 

Hello Michael,
 
<<<     Gary, when you compile the construction details, please
include some indication of modification for using round ferrites,
such as scavenged from old AM bedside radios. One would
need more rods and a different number of turns of the litz.
With some indication I could first try with magnet wire to get
an idea of the number of turns of the precious litz required.   >>>
 
Unfortunately, Michael, substituting any type of ferrite rods for the lightweight bars in the 3" FSL design would make the resulting antenna too top-heavy and impractical for a glue bond with the PL-380 cabinet. Lightweight FSL design is imperative for any hope of success in this aspect.
 
If you are not planning to attach your FSL (and frame) directly to the PL-380 cabinet then you can hook up almost any type of antenna that you wish to the circuit board connection points (within the recommended inductance range of 180-450 uH) and presumably enjoy increased sensitivity over the stock loopstick. The drawback of this approach is that the combination would lack portability, one of the primary objectives of the 3" Bar FSL PL-380 project.
 
73, Gary DeBock (in Puyallup, WA, USA)
 
 
 
  
 
 
 

-----Original Message-----
From: 'Michael' michael.setaazul@... [ultralightdx]
To: ultralightdx
Sent: Fri, Jan 8, 2016 1:39 am
Subject: Re: [ultralightdx] 3 Inch FSL Tecsun PL-380 Model-- Construction Parts Required

 
Gary, when you compile the construction details, please
include some indication of modification for using round ferrites,
such as scavenged from old AM bedside radios. One would
need more rods and a different number of turns of the litz.
With some indication I could first try with magnet wire to get
an idea of the number of turns of the precious litz required.

Thanks!

Michael

----- Original Message -----

For those who would like to order the construction parts in advance for the 3" FSL Tecsun PL-380
project,
I have attached a detailed photo showing the different items required for the model. These are:
. . .
2) 37 feet of 250/46 Litz wire http://www.ebay.com/itm/Litz-wire-250-46-0-04-mm-for-
crystal-radio-coil-Loop-antenna-100-/160804560511?hash=item2570b2de7f:m:m9fkDfLaAd59_UEmrp1po5w
. . .
3) 8 Russian surplus 100mm x 20mm x 3mm ferrite bars (availability currently uncertain--
author has limited supply, but would prefer that an eBay source reappear for multiple orders)
. . .


Re: 3 Inch FSL Tecsun PL-380 Model-- Construction Parts Required [1 Attachment]

Michael <michael.setaazul@...>
 

Gary, when you compile the construction details, please
include some indication of modification for using round ferrites,
such as scavenged from old AM bedside radios. One would
need more rods and a different number of turns of the litz.
With some indication I could first try with magnet wire to get
an idea of the number of turns of the precious litz required.

Thanks!

Michael

----- Original Message -----

For those who would like to order the construction parts in advance for the 3" FSL Tecsun PL-380
project,
I have attached a detailed photo showing the different items required for the model. These are:
. . .
2) 37 feet of 250/46 Litz wire http://www.ebay.com/itm/Litz-wire-250-46-0-04-mm-for-
crystal-radio-coil-Loop-antenna-100-/160804560511?hash=item2570b2de7f:m:m9fkDfLaAd59_UEmrp1po5w
. . .
3) 8 Russian surplus 100mm x 20mm x 3mm ferrite bars (availability currently uncertain--
author has limited supply, but would prefer that an eBay source reappear for multiple orders)
. . .

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