Date   

Re: Brazilian DX Club Ferrite Rod Loop with 36 Ferrite Rods & Videos

Gary DeBock
 

Hello Jerry,

Thanks for your interest in our Ferrite Sleeve Loop antenna
experimentation.

Although I certainly don't recommend that a DXer build one of these
beasts without understanding the financial challenge involved (and
reading the experimental report), a photo of the two largest FSL test models here is posted at http://www.mediafire.com/i/?5kh0k9wnq1p69l0 .
The model on the left is a 12" diameter FSL composed of 84 Russian
surplus 200mm x 10mm ferrite rods (25 pounds, including frame) and the
model on the right is a relatively small 8" diameter FSL, composed of
75 Russian surplus 160mm x 8mm ferrite rods (only 13 pounds). When you
build one of these antennas, you may come to understand why it acquired
the nickname of the Financial Sinkhole Loop.

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

-----Original Message-----
From: jerry_popiel <jerry_popiel@...>
To: ultralightdx <ultralightdx@...>
Sent: Mon, May 30, 2011 11:41 pm
Subject: [ultralightdx] Brazilian DX Club Ferrite Rod Loop with 36
Ferrite Rods & Videos

 
My first post. Has anyone seen the massive Ferrite Rod Loop on You Tube
and the writeup on:
http://www.sarmento.eng.br/Loop_Ferrite_Rod_Antenna.htm This writeup
includes the Videos. Apparently these folks say they have been
experimenting for 10 years and claim they have a great stand alone
loop- its a big Loop but looks to be portable its in a PVC Pipe. The
Videos look to be extremely impressive. On You Tube it can also seen it
under Monster Ferrite Loops.

I tried to contact these folks since they say their mission is to
"Produce it and make it available for purchase to MW and SW
enthusiasts" but no success in trying to contact them.

A stand alone Loop would be great since it could likely be switched
over to different Radios with little problems, but are these Loops the
real deal? And with 36 Ferrite Rods wouldn't the price be astronomical
ie 36 X 20 = $720.00 just for the Ferrite Rods!!

There are some other impressive looking Loops on You Tube - Loopstick
Gold, as well as "The Bomb - Inductive Loop, but are mostly in foreign
languages. Am looking forward to Gary DeBock's and others further
experiments with Ferrite Rod Loops.

Any comments would be greatly appreciated.

Jerry


Re: Brazilian DX Club Ferrite Rod Loop with 36 Ferrite Rods & Videos

Pollock,Raphael E <rpollock@...>
 

Hi Sarmento!
 
I still have not yet made it down to Brazil again, but continue to experiment with the ferrite bars. I have three bars from Stormwise here in the States: 19 inch, 27 inch, and 48 inch--all are 125 mu--glad i purchased them last year while they were still affordable. The primary coil on each is wound with 38 turns of 640/46 Litz. Interestingly, there is at best about one S unit of increased gain on the 48 inch bar compared to either of the other two, so it would seem that there is a definite limit as to increasing length:increasing gain. The Q is very sharp and i have found that inserting a vernier reduction devise into the drive shaft between the variable capacitor and the tuning knob is a big help. I have the 27 inch antenna connected to a Palstar R30 receiver (direct coupled to 500 ohm terminii) and the 19 inch inductively coupled to my Satellit 750, which is actually more sensitive than the R30 set up.
 
What's new with your efforts??
 
Best regards;
 
Raphael
 

From: ultralightdx@... [ultralightdx@...] On Behalf Of Sarmento [sarmento.campos@...]
Sent: Tuesday, May 31, 2011 8:16 AM
To: ultralightdx@...
Subject: [ultralightdx] Re: Brazilian DX Club Ferrite Rod Loop with 36 Ferrite Rods & Videos

 



Hi Jerry

Please feel free to email me sarmento.campos@...

Or reach me on Skype: sarmento2k

I would like to exchange info about loop antennas.
Best regards
Sarmento
Sent from my mobile phone

--- In ultralightdx@..., "jerry_popiel" wrote:
>
> My first post. Has anyone seen the massive Ferrite Rod Loop on You Tube and the writeup on: http://www.sarmento.eng.br/Loop_Ferrite_Rod_Antenna.htm This writeup includes the Videos. Apparently these folks say they have been experimenting for 10 years and claim they have a great stand alone loop- its a big Loop but looks to be portable its in a PVC Pipe. The Videos look to be extremely impressive. On You Tube it can also seen it under Monster Ferrite Loops.
>
> I tried to contact these folks since they say their mission is to "Produce it and make it available for purchase to MW and SW enthusiasts" but no success in trying to contact them.
>
> A stand alone Loop would be great since it could likely be switched over to different Radios with little problems, but are these Loops the real deal? And with 36 Ferrite Rods wouldn't the price be astronomical ie 36 X 20 = $720.00 just for the Ferrite Rods!!
>
> There are some other impressive looking Loops on You Tube - Loopstick Gold, as well as "The Bomb - Inductive Loop, but are mostly in foreign languages. Am looking forward to Gary DeBock's and others further experiments with Ferrite Rod Loops.
>
> Any comments would be greatly appreciated.
>
> Jerry
>


Re: Brazilian DX Club Ferrite Rod Loop with 36 Ferrite Rods & Videos

sarmento2k
 

Hi Jerry

Please feel free to email me sarmento.campos@...

Or reach me on Skype: sarmento2k

I would like to exchange info about loop antennas.
Best regards
Sarmento
Sent from my mobile phone

--- In ultralightdx@..., "jerry_popiel" <jerry_popiel@...> wrote:

My first post. Has anyone seen the massive Ferrite Rod Loop on You Tube and the writeup on: http://www.sarmento.eng.br/Loop_Ferrite_Rod_Antenna.htm This writeup includes the Videos. Apparently these folks say they have been experimenting for 10 years and claim they have a great stand alone loop- its a big Loop but looks to be portable its in a PVC Pipe. The Videos look to be extremely impressive. On You Tube it can also seen it under Monster Ferrite Loops.

I tried to contact these folks since they say their mission is to "Produce it and make it available for purchase to MW and SW enthusiasts" but no success in trying to contact them.

A stand alone Loop would be great since it could likely be switched over to different Radios with little problems, but are these Loops the real deal? And with 36 Ferrite Rods wouldn't the price be astronomical ie 36 X 20 = $720.00 just for the Ferrite Rods!!

There are some other impressive looking Loops on You Tube - Loopstick Gold, as well as "The Bomb - Inductive Loop, but are mostly in foreign languages. Am looking forward to Gary DeBock's and others further experiments with Ferrite Rod Loops.

Any comments would be greatly appreciated.

Jerry


Re: Brazilian DX Club Ferrite Rod Loop with 36 Ferrite Rods & Videos

Pollock,Raphael E <rpollock@...>
 

They are the real deal--see Youtube search under the term "ferrite rod antenna" for a number of illustrative videos. the key points: use 125 mu ferrite that is at least 10 x > length than width, use the highest strand Litz wire you can get your hands on, use a good quality variable capacitor (availalble At multiple web sites for ~ $15-20), use pvc pipe housing for protection and mechanical stability, and consider using a vernier reduction drive so you can tune to peak Q, which can be a very narrow spike...
 

From: ultralightdx@... [ultralightdx@...] On Behalf Of jerry_popiel [jerry_popiel@...]
Sent: Tuesday, May 31, 2011 1:41 AM
To: ultralightdx@...
Subject: [ultralightdx] Brazilian DX Club Ferrite Rod Loop with 36 Ferrite Rods & Videos

 

My first post. Has anyone seen the massive Ferrite Rod Loop on You Tube and the writeup on: http://www.sarmento.eng.br/Loop_Ferrite_Rod_Antenna.htm This writeup includes the Videos. Apparently these folks say they have been experimenting for 10 years and claim they have a great stand alone loop- its a big Loop but looks to be portable its in a PVC Pipe. The Videos look to be extremely impressive. On You Tube it can also seen it under Monster Ferrite Loops.

I tried to contact these folks since they say their mission is to "Produce it and make it available for purchase to MW and SW enthusiasts" but no success in trying to contact them.

A stand alone Loop would be great since it could likely be switched over to different Radios with little problems, but are these Loops the real deal? And with 36 Ferrite Rods wouldn't the price be astronomical ie 36 X 20 = $720.00 just for the Ferrite Rods!!

There are some other impressive looking Loops on You Tube - Loopstick Gold, as well as "The Bomb - Inductive Loop, but are mostly in foreign languages. Am looking forward to Gary DeBock's and others further experiments with Ferrite Rod Loops.

Any comments would be greatly appreciated.

Jerry


Re: Tecsun PL-310 vs Sonys?

Charly <calpublic@...>
 


Hello,

I've bought one of the "sister" of the PL-310 : the PL-390. So I will speak based on my experience.

DSP signal processing does bring a lot to listening quality, but don't think it works like magic. I also have a Sony SW100, Eton G3 and Sangean 909 : the G3 and PL-390 have similar sensitivity and selectivity, but the G3 sometime needs Sync-detect to match the Tecsun. (the Tecsun really lacks these to be a top performer !). And sometime the Sangean gives a better sounds even off the whip.

I found the Tecsun (nor the G3) doesn't like long external antenna (easily overloaded), where as the Sangean or Sony works perfectly with it.

Typically the Sangean is my based radio with an external antenna and grounding, it beats all other radios I have, then the G3/PL-390, and then the SW100 which is always impressive for its size (this is my pocket travel radio). If I must use the radio just "off-the-whip", I choose the PL-390 or the G3.

If you have some money to try it, I think it is worth the price.
I personally chose the 390 because of the stereo speakers, line-in and longer MW antenna (internal ferrite rod). Battery life is very good on the Tecsun.

My 2 cents...

Charly

--------------------------------------
From: telesepsis
Date: Tue, 31 May 2011 06:50:04 -0000
To: ultralightdx@...
Cc:
Subject: [ultralightdx] Tecsun PL-310 vs Sonys?

 

Howdy all, I'm a long time Ultralight DXer in Southern California, aided by my trusty Sony SRF-T615 and 7600GR; I've owned this pair for several years now and haven't seen the need for another radio, but I'm seeing a lot of recommendations for the Tecsun PL-310 here - am I missing anything by not owning this particular radio, or do I already have all my bases covered?

__._,_


Re: Brazilian DX Club Ferrite Rod Loop with 36 Ferrite Rods & Videos

Marc Coevoet
 

Op 31-05-11 08:41, jerry_popiel schreef:
My first post. Has anyone seen the massive Ferrite Rod Loop on You Tube
and the writeup on:
http://www.sarmento.eng.br/Loop_Ferrite_Rod_Antenna.htm This writeup
includes the Videos. Apparently these folks say they have been
experimenting for 10 years and claim they have a great stand alone loop-
its a big Loop but looks to be portable its in a PVC Pipe. The Videos
look to be extremely impressive. On You Tube it can also seen it under
Monster Ferrite Loops.
These things look nice, but if you made a loop of 15meters wire in a hula hoop 85cm wide, you would get a similar result.

I have a loop for AM and one for SW, they give 90% signal of the Wellbrook ALA1530, they don't use electricity, and are 15% smaller ....


Marc

--
The "Penguin" has arrived - and he's not going away - ever.
What's on Shortwave guide: choose an hour, go!
http://shortwave.tk
700+ Radio Stations on SW http://swstations.tk
300+ languages on SW http://radiolanguages.tk


Tecsun PL-310 vs Sonys?

telesepsis
 

Howdy all, I'm a long time Ultralight DXer in Southern California, aided by my trusty Sony SRF-T615 and 7600GR; I've owned this pair for several years now and haven't seen the need for another radio, but I'm seeing a lot of recommendations for the Tecsun PL-310 here - am I missing anything by not owning this particular radio, or do I already have all my bases covered?


Brazilian DX Club Ferrite Rod Loop with 36 Ferrite Rods & Videos

jerry_popiel
 

My first post. Has anyone seen the massive Ferrite Rod Loop on You Tube and the writeup on: http://www.sarmento.eng.br/Loop_Ferrite_Rod_Antenna.htm This writeup includes the Videos. Apparently these folks say they have been experimenting for 10 years and claim they have a great stand alone loop- its a big Loop but looks to be portable its in a PVC Pipe. The Videos look to be extremely impressive. On You Tube it can also seen it under Monster Ferrite Loops.

I tried to contact these folks since they say their mission is to "Produce it and make it available for purchase to MW and SW enthusiasts" but no success in trying to contact them.

A stand alone Loop would be great since it could likely be switched over to different Radios with little problems, but are these Loops the real deal? And with 36 Ferrite Rods wouldn't the price be astronomical ie 36 X 20 = $720.00 just for the Ferrite Rods!!

There are some other impressive looking Loops on You Tube - Loopstick Gold, as well as "The Bomb - Inductive Loop, but are mostly in foreign languages. Am looking forward to Gary DeBock's and others further experiments with Ferrite Rod Loops.

Any comments would be greatly appreciated.

Jerry


Re: More Radio Articles and Designs

Michael <michael.setaazul@...>
 

Cant wait to see the 1.5v designs, Phil!
Anything above 3v should be outlawed as EHT :-)

Michael

----- Original Message ----------------------------------------------------------------
Subject: [ultralightdx] Re: More Radio Articles and Designs

you're welcome Michael. building 1AD/2AD radios is economical and fun.
some of my next designs run on 1.5 volts.

regards,
phil :)


Re: More Radio Articles and Designs

just_rtfm
 

you're welcome Michael. building 1AD/2AD radios is economical and fun. some of my next designs run on 1.5 volts.

regards,
phil :)


Re: Denver TWR-804, anyone know this radio?

BILLY PAGE
 

Hi all
 
it looks like a re-cased TECSUN R-9012
which is an EXC radio !!!
 
DJBILLY

On Mon, May 30, 2011 at 2:52 PM, dave_hackwell <dave_hackwell@...> wrote:

 

Welcome to the group and I look forward to dx reports on the little radio. Let's here how it performs ?

I've never heard of the name before but searching the net, it's common on mainland europe but not reached the UK yet.

Looking at www.denver-electronics.com they certainly could ship into the UK in bulk.....

24 pcs./export carton
18.763 pcs./20' container
45.600 pcs./49' container That's a lot of radio's !

Dave
N.W. England

--- In ultralightdx@..., "Dan Carlsson" wrote:
>
>
> Hi!
>
> This is my first post here, what a nice group!
>
> I just got me a cheap little radio, a Denver TWR-804.
>
> Its AM, FM and SW band 1-7, and its easily available at many stores and
> supermarkets here in Sweden.
>
> I paid 89:- in Swedish currency, wich is like 14 us dollar, and thats
> cheap for electronic stuff in Sweden.
>
> Anyone know anything about this lil beast? I think is pretty sensitive,
> and pick up many stations with not to bad sound.
>
> Maybe its a rebadged chinese model?
>
> I put 2 pictures of it in the Photos section.
>
> All the best from Dan in Sweden!
>



Re: Denver TWR-804, anyone know this radio?

dave_hackwell <dave_hackwell@...>
 

Welcome to the group and I look forward to dx reports on the little radio. Let's hear how it performs ?

I've never heard of the name before but searching the net, it's common on mainland europe but not reached the UK yet.

Looking at www.denver-electronics.com they certainly could ship into the UK in bulk.....

24 pcs./export carton
18.763 pcs./20' container
45.600 pcs./49' container That's a lot of radio's !

Dave
N.W. England

--- In ultralightdx@..., "Dan Carlsson" <dan.carlsson_67@...> wrote:


Hi!

This is my first post here, what a nice group!

I just got me a cheap little radio, a Denver TWR-804.

Its AM, FM and SW band 1-7, and its easily available at many stores and
supermarkets here in Sweden.

I paid 89:- in Swedish currency, wich is like 14 us dollar, and thats
cheap for electronic stuff in Sweden.

Anyone know anything about this lil beast? I think is pretty sensitive,
and pick up many stations with not to bad sound.

Maybe its a rebadged chinese model?

I put 2 pictures of it in the Photos section.

All the best from Dan in Sweden!


Re: Denver TWR-804, anyone know this radio?

keith beesley
 

Hi Dan, welcome to the group,

No, I've never heard of the "Denver" brand here in the USA. I agree, probably a re-badged Chinese model; looks very similar to the R-911, R-9012, etc.

Regards,

Keith Beesley
Seattle WA USA

--- In ultralightdx@..., "Dan Carlsson" <dan.carlsson_67@...> wrote:


Hi!

This is my first post here, what a nice group!

I just got me a cheap little radio, a Denver TWR-804.

Its AM, FM and SW band 1-7, and its easily available at many stores and
supermarkets here in Sweden.

I paid 89:- in Swedish currency, wich is like 14 us dollar, and thats
cheap for electronic stuff in Sweden.

Anyone know anything about this lil beast? I think is pretty sensitive,
and pick up many stations with not to bad sound.

Maybe its a rebadged chinese model?

I put 2 pictures of it in the Photos section.

All the best from Dan in Sweden!


Denver TWR-804, anyone know this radio?

Dan Carlsson
 

Hi!

This is my first post here, what a nice group!

I just got me a cheap little radio, a Denver TWR-804.

Its AM, FM and SW band 1-7, and its easily available at many stores and
supermarkets here in Sweden.

I paid 89:- in Swedish currency, wich is like 14 us dollar, and thats
cheap for electronic stuff in Sweden.

Anyone know anything about this lil beast? I think is pretty sensitive,
and pick up many stations with not to bad sound.

Maybe its a rebadged chinese model?

I put 2 pictures of it in the Photos section.

All the best from Dan in Sweden!


Re: More Radio Articles and Designs

Michael <michael.setaazul@...>
 

Phil, thanks for these very useful links.
Close to my qrp ideal!

Budget problem solved :
sell Tecsun, buy ferrite for FSL,
build own super-uldx-rx :-)

Michael

----- Original Message -----
From: "just_rtfm" <just_rtfm@...>
To: <ultralightdx@...>
Sent: 30 May 2011 09:49
Subject: [ultralightdx] Re: More Radio Articles and Designs




hi Michael,

yes, the designs are located here:

http://home.comcast.net/~phils_radio_designs/

this is Dave Schmarder's build-up of my Hellenedyne, with his refinements:

http://makearadio.com/tube/h-dyne.php

i have some designs coming that probably would fit in a match box.

regards,
phil :)




------------------------------------

Yahoo! Groups Links


Re: More Radio Articles and Designs

just_rtfm
 

hi Michael,

yes, the designs are located here:

http://home.comcast.net/~phils_radio_designs/

this is Dave Schmarder's build-up of my Hellenedyne, with his refinements:

http://makearadio.com/tube/h-dyne.php

i have some designs coming that probably would fit in a match box.

regards,
phil :)


Re: More Radio Articles and Designs

Michael <michael.setaazul@...>
 

Phil, do you post your single tube(valve!)/transistor designs anywhere?
Or do you know of websites that feature this aspect? Some would
doubtless even fit the uldx dimensional requirements!

Michael UK

----- Original Message -----
From: "just_rtfm" <just_rtfm@...>
To: <ultralightdx@...>
Sent: 30 May 2011 00:18
Subject: [ultralightdx] Re: More Radio Articles and Designs




hi Gary!

i like the 4 kHz filter; offset-tuned by 3 kHz. yes, a slow-AGC is a big help. i agree, the DSP
filters are nice. i use my PL-390 as a spotter. i am pretty hooked on designing single
tube/transistor radios.

regards,
phil




------------------------------------

Yahoo! Groups Links


Detailed Ferrite Sleeve Loop (FSL) Experimentation

Gary DeBock
 

Hello All,

For the past few weeks several of us have been conducting detailed
experimentation on large-scale FSL models (8" and 12" diameter), in a
serious effort to discover the advantages of this new design, and sort
out fact from fiction. Steve Ratzlaff, Kevin Schanilec and I have all
constructed multiple large-scale FSL test models, compared notes, and
shared our individual impressions on how to obtain the best performance
from these innovative antennas. Until we reached a consensus on
various basic FSL principles, we thought it was best to keep our results
confidential, and share them with the Ultralightdx group once we agreed
on the fundamental concepts. For the benefit of the Ultralightdx group,
we also wanted to keep detailed records of the reliability (or lack
thereof) of the various sellers of surplus Russian ferrite on eBay,
which is likely to be of great interest to any hobbyist desiring to
build one of these antennas.

In general, the FSL design is a major DXing breakthrough, providing
high-gain antenna performance from a very compact package. The 8" and
12" diameter FSL's constructed here have provided DXing results (on
both LW and MW) competitive with larger air-core tuned passive loops
(up to 6' per side). Balanced against this compact, high-gain
capability are the side effects of serious weight and cost, resulting
in a tradeoff concept that will not please everyone.

In our initial experimentation we have agreed on the following basic
FSL design concepts:

a. The FSL Test Set showed that 1/4-3/8" spacing of coil from ferrite
gave the highest output of an FSL.
b. Use of the largest Litz wire always gave the highest signal output.
c. Even mediocre, small Litz wire gave higher output compared to
non-Litz.
d. The larger the coil diameter the higher the output--make it as
large as you can (8" suggested minimum coil diameter, at least for an
LF loop).
e. A continuous ferrite sleeve gives highest output, but even some
spacing of ferrite produces a useable FSL.
f. The larger FSL's (8" and 12" diameter) can provide inductive
coupling up to 24" off to the side of the coils (the side lobe), in
addition to up to 24" in front (and in back) of the coils. In many
cases, the quality of reception provided by this side lobe is superior
to that provided by the front and back lobes.
g. FSL coil isolation seems to have a significant effect on
performance. A coil placed close to ground level, near electrical
conductors or near indoor house wiring will not perform as well as an
electrically isolated coil in an outdoor environment. The use of
non-conducting FSL frame material (like PVC pipes) can assist in
providing the best performance.
h. The length of the ferrite rods used in the sleeve does seem to have
a significant effect upon ultimate FSL sensitivity (contrary to what
Graham says). The most sensitive FSL's combine relatively few
turns of large Litz wire with relatively long ferrite rods.
i. In comparison to large air-core tuned passive loops, the FSL design
will typically provide greater tuning bandwidth with the same value of
variable capacitor. The larger FSL's (8" and 12" diameter) can also
provide LW and MW sensitivity which is competitive with the larger
air-core loops (3' to 6' side dimensions), using a higher-Q tuning
system in a much more compact package. Despite this, the larger-sized
FSL's typically have much greater weight and component cost than the
large-scale air-core loops, resulting in a trade-off of antenna
advantages.

These basic concepts are only an initial report from our FSL
experimentation, and none of us claim to be experts on the design. We
are all still learning the quirks and advantages of the new antenna
system, and look forward to having others join us in this
experimentation. Detailed reports on the individual FSL test models
(and the eBay ferrite sellers) will follow, and we recommend that
interested hobbyists wait for this information before proceeding with
costly ferrite orders.

73 and Good DX,
Gary DeBock (in Puyallup, WA, USA)


Re: More Radio Articles and Designs

Albert
 

Should be getting on by the middle of this week. could not resist.

--- In ultralightdx@..., "Pollock,Raphael E" <rpollock@...> wrote:

I love it--not a URL but otherwise just like the 380 feature-wise but with a considerably longer and more sensitive ferrite bar antenna

From: Albert [mailto:aherb62@...]
Sent: Sunday, May 29, 2011 07:11 PM
To: ultralightdx@... <ultralightdx@...>
Subject: [ultralightdx] Re: More Radio Articles and Designs



Speaking of the PL-390 I was wondering how you like it?

Big Al N0CEK
--- In ultralightdx@...<mailto:ultralightdx%40yahoogroups.com>, "just_rtfm" <just_rtfm@> wrote:



hi Gary!

i like the 4 kHz filter; offset-tuned by 3 kHz. yes, a slow-AGC is a big help. i agree, the DSP filters are nice. i use my PL-390 as a spotter. i am pretty hooked on designing single tube/transistor radios.

regards,
phil


Re: More Radio Articles and Designs

Pollock,Raphael E <rpollock@...>
 

I love it--not a URL but otherwise just like the 380 feature-wise but with a considerably longer and more sensitive ferrite bar antenna
 
From: Albert [mailto:aherb62@...]
Sent: Sunday, May 29, 2011 07:11 PM
To: ultralightdx@... <ultralightdx@...>
Subject: [ultralightdx] Re: More Radio Articles and Designs
 
 

Speaking of the PL-390 I was wondering how you like it?

Big Al N0CEK
--- In ultralightdx@..., "just_rtfm" <just_rtfm@...> wrote:
>
>
>
> hi Gary!
>
> i like the 4 kHz filter; offset-tuned by 3 kHz. yes, a slow-AGC is a big help. i agree, the DSP filters are nice. i use my PL-390 as a spotter. i am pretty hooked on designing single tube/transistor radios.
>
> regards,
> phil
>

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