Date   

Re: Introducing the ULR DXing Chart-Index

 

Hello.
My logs go back way too far and have too little information in places to be able to add this in for them. Anything new, I will be adding it in.

 
 
Sent: Thursday, July 29, 2021 at 7:25 AM
From: "Pedro Porres" <pporres@...>
To: main@UltralightDX.groups.io
Subject: Re: [UltralightDX] Introducing the ULR DXing Chart-Index
Hi all,
Lately I'm a bit busy moving to my new apartment, I still usually read your messages. I just sent Jorge a file with the 5 listeners requested. I realize that in relation to the proposed index, it is more interesting to capture low power stations, although closer, than distant stations but with high transmission power. I hope this activity will serve to encourage new fans of DX and radio.
Best regards to everyone.

Pedro Porres
Cordoba (Spain)


Re: March 2021 South American Ultralight DXpedition by Martin Butera

 

I could be part of this also. I am not to the same level as you experts but could have a try.

 
 
Sent: Wednesday, July 28, 2021 at 7:28 PM
From: "Jorge Garzón via groups.io" <iberiaDX@...>
To: main@UltralightDX.groups.io
Subject: Re: [UltralightDX] March 2021 South American Ultralight DXpedition by Martin Butera
Ji,
Great work from Martin!!
Perhaps there is not an evident two-way propagation happening every time we listen to the band. Theorically everything is possible, bit how and when almost impossible to predict.

Something never happened before was to organize a global MW DXP with UL/Small Portables and FSL. We could try one or two combined dates in the year and then combine and share together. Imagine... Peter in Central África, Gary in Oregon, Paul in Tasmania, Paul Logan in Eire, Alaska, and me in Spain/Portugal. That could be the first Worldwide MW UL DXP in the history.

73
--
Jorge Garzón (EB7EFA · EA1036 SWL) 
QTH: IN83ag / 43º15' N · 03º56' W
Urb. San Roque 95, casa 5 (Villasevil)
39698 Santiurde de Toranzo (ESPAÑA - SPAIN)
..................................................................................
Blog: IberiaDX  · Twitter: @IberiaDX


Re: Retekess V-115 FM/AM/SW Radio Review – July 2021

 

Mine has been delayed again, they reckon mid next week at this stage.

 
 
Sent: Wednesday, July 28, 2021 at 2:25 PM
From: "Paul Blundell" <tanger32au@...>
To: main@ultralightdx.groups.io
Subject: Re: [UltralightDX] Retekess V-115 FM/AM/SW Radio Review – July 2021
Six Days In:
Yesterday I focused on the FM band. Running some side by side comparisons showed that this has the edge over the AR-1733 for audio quality but the AR-1733 was able to pick up more stations. I used a couple of the CBD translators as the test signals for this. The AR-1733 was able to hear these with a much stronger signal, compared to the V-115.

I have also been using the recorder more and am getting the hang of this and the functions to delete recordings. I have also attempted copying some recordings off and playing these on my laptop, that has worked very well.
 
On Tue, Jul 27, 2021 at 7:18 PM Paul Blundell via groups.io <tanger32au=gmail.com@groups.io> wrote:
Much the same as me. I find FM is good of a night time as I go to sleep.
 
On Tue, 27 Jul 2021, 16:41 Frank Standford, <dxer2k1@...> wrote:
Both. FM for fun, AM for DXing.
 
 
Sent: Tuesday, July 27, 2021 at 2:07 PM
From: "Paul Blundell" <tanger32au@...>
To: main@ultralightdx.groups.io
Subject: Re: [UltralightDX] Retekess V-115 FM/AM/SW Radio Review – July 2021
I will be very interested to see how it goes for you and your thoughts. Will you be using it mostly for AM or FM?
 
On Tue, Jul 27, 2021 at 11:57 AM Frank Standford <dxer2k1@...> wrote:
 
Mine should only be days away.
 
Sent: Monday, July 26, 2021 at 4:11 PM
From: "Paul Blundell" <tanger32au@...>
To: main@ultralightdx.groups.io
Subject: Re: [UltralightDX] Retekess V-115 FM/AM/SW Radio Review – July 2021
Mine seems to work well enough. I need to spend some more time testing all the features but so far I am happy with it.
 
Paul
 
On Mon, Jul 26, 2021 at 12:54 PM Frank Standford <dxer2k1@...> wrote:
Mine should only be a week or so away. I hope I get a good example with no issues.
 
 
 
Sent: Sunday, July 25, 2021 at 7:02 PM
From: "Paul Blundell" <tanger32au@...>
To: main@ultralightdx.groups.io
Subject: Re: [UltralightDX] Retekess V-115 FM/AM/SW Radio Review – July 2021
Thanks for the information, it matches much of what I have found so far.
 
Paul
 
On Sun, 25 Jul 2021, 11:34 Mark Roberts, <markrobt@...> wrote:
This radio originally came out as the Tivdio V-115 and has gone by numerous other names. This page has extensive information about this model: https://www.qsl.net/n9ewo/v115.html
 
I have a Tivdio V-115 - the AM and FM performance is so-so, with odd digital noises popping up here and there. On the other hand, the recording function does a very good job, better than comparable products from Tecsun, though not as good as a separate, dedicated recorder such as one of the Tascam models. The speaker sound is surprisingly good for a radio of its size. The user interface is quirky and you can't press the buttons too fast, otherwise the radio will just ignore you.
 
On Thu, Jul 22, 2021 at 5:00 PM Paul Blundell <tanger32au@...> wrote:
 

 

First Impressions:
I recently ordered the Retekess V-115 FMAMSW Radio off eBay, for under $30 it seemed like good value and the built-in recorder to an SD card seemed like a feature I could make use of.
Physical – The radio is fairly small / light and seems to be built as well as you would expect for a radio at this price point.
Usage – from my testing so far, it seems to work as I would expect and pulls in signals “barefoot” as well as my Teac PR130. I feel so far that my Digitech AR-1733 still has the edge in RF performance.
Issues – So far, I have found a few issues. The tuning modes are that you either manually enter a frequency via the keypad or you use the auto tune modes, you can’t scroll from frequency to frequency, say from 531kHz to 540kHz, you need to either enter each frequency or use the auto tune modes, these only work on the strongest signals so for serious DXing, this is a huge disadvantage. The display backlight is VERY bright which means it is not easy to use in bed, it lights up the whole room, this reduces the “wife approval factor” as it looks like aliens are in the room. I have also noticed that the buttons are hard to press and have a noise with them, this also makes bedtime use less than ideal. The recorder works well but names the files RAD001, RAD002, this means I need to keep a record of what frequency each recording relates to.

Overall, I am on the fence with this so far, while it has some good features, the tuning mode is going to be harder to use and the file name for the recordings is a pain.

 

 

 

 

 

 

 
 
--
Paul
 

 

 

 
 
--
Paul
 

 

 

 
 
--
Paul
 


Re: Introducing the ULR DXing Chart-Index

Paul Blundell
 

Spot on Pedro. I ran some numbers on some stations and found that the lower power ones, even if they are fairly close to me, get much better index scores. 


On Thu, Jul 29, 2021 at 7:25 AM Pedro Porres <pporres@...> wrote:
Hi all,
Lately I'm a bit busy moving to my new apartment, I still usually read your messages. I just sent Jorge a file with the 5 listeners requested. I realize that in relation to the proposed index, it is more interesting to capture low power stations, although closer, than distant stations but with high transmission power. I hope this activity will serve to encourage new fans of DX and radio.
Best regards to everyone.

Pedro Porres
Cordoba (Spain)



--
Paul


Re: Retekess V-115 FM/AM/SW Radio Review – July 2021

Paul Blundell
 

Thanks Tammy.

It looks like the issue is the earphones I was using and not the radio itself. I have tried it with a different set of earphones and the internal speaker stopped working when I plugged them in. I have tested some more and found with the ones I use the most, if I pull them out a small way (see attached photo) it works. Not sure what I will do as I prefer to use these ones.

On Thu, Jul 29, 2021 at 7:17 AM <tdwalker13@...> wrote:
Hi, Paul.  I didn't see an answer to your question about the earphones and speaker, so here's my experience with it.  That doesn't happen on the two that I have.  One I grabbed on sale to use primarily for recording from other radios, so less experience with that one via earphones but no problems so far.  I've used the other one for a long while now pretty much exclusively with earphones, since it's the one I use when I unintentionally wake up at 4am and don't want to wake up my husband....  I also ended up getting a Koss VC20 volume control since the radio was too loud via earphones set to the lowest volume. 

A good radio for the purposes I have them for (recording and local strong AM/FM), but definitely a mess when I attached an external antenna. 

Hope this helps.

--
Tammy



--
Paul


Re: March 2021 South American Ultralight DXpedition by Martin Butera

Paul Blundell
 

I 100% agree, we have some really determined members of the ultralight DXing community and they give me something to aspire for.

Paul

On Thu, Jul 29, 2021 at 6:46 AM Gary DeBock via groups.io <D1028Gary=aol.com@groups.io> wrote:
On Wed, Jul 28, 2021 at 04:16 AM, radiojayallen wrote:
An amazing list considering he used only the Radiwow barefoot...really shows how the skill of the user is at least as important as the quality of the equipment. You gotta respect that!

Jay
Absolutely!

Any time a DXer gets outstanding results by extra effort using very basic equipment, he deserves a lot of praise. Other recent Ultralight radio examples are Peter in Botswana, and Paul in Alaska. Both of those guys face weather extremes in addition to the Ultralight radio challenge, and both deserve a ton of respect for their awesome results. Martin in Brazil is the latest example of this determined attitude-- which has made this group one of the most vibrant in the AM-DXing community.

Gary DeBock (in Puyallup, WA, USA)


  



--
Paul


Ferrite technical considerations for FSL’s

Robert Conboy
 

The effective initial permeability of a ferrite rod decreases with increasing diameter. This is because the flux is increasingly concentrated toward the outside of the radius. As you go deeper toward the center, the presence of ferrite has a diminishing contribution to the flux. Therefore, for large enough diameters, you can use a hollow cylinder of ferrite with little effect on the inductance as compared to solid ferrite. In other words, a ferrite sleeve. I *think*  diameter’s diminishing contribution to total flux begins to become significant with radiuses between 8 and 16 mm.

 

The effective permeability of a 9 inch or 230 mm diameter slug of mix 61 (u’ = 125) is about 4 or 5. In this case, most of the ferrite isn’t actually being used if it is a (heavy) solid slug. The calculations that predict inductance still work fairly accurately for hollow ferrite cylinders of 8 to 16 mm wall thickness.

 

The sensitivity of an air-core loop antenna increases with increasing diameter. This also applies if there is ferrite present.

 

For a fixed length of ferrite, as diameter increases, ferrite’s contribution to sensitivity decreases in proportion to that of an air core loop. (Ferrite permeability is still higher than air, but diminishing) The effective permeability of the ferrite decreases with increasing diameter. At some point in increasing diameter, the presence of ferrite will have a nil effect on the antenna sensitivity.  It becomes an air core loop slightly enhanced by the presence of ferrite. I *think* that diameter is somewhere between 1/2 and 1 meter, (beyond which it behaves mostly as an air core loop). My intuition says that  diameter may be smaller for shorter lengths of ferrite but I have not confirmed this experimentally.

 

The converse of this relationship is that increasing length of the ferrite increases the magnetic flux. At longer lengths, the effective permeability begins to approach a limit set by the initial permeability of the ferrite material. Therefore, the benefit  gained by further increasing the length diminishes as the length increases. 

 

In between these two extremes there is a practical region where doubling the length has about the same effect on antenna sensitivity as doubling the diameter.  

 

For solid ferrite, going for length is far more efficient because increasing the diameter results in an exponential increase of mass.

 

For a hollow sleeve consisting of bars or rods mounted on a former, arranged as a cylinder, doubling the length vs. doubling the diameter use the same amount of ferrite. Antenna performance has about a 1 to 1 ratio between proportional changes in diameter vs. proportional changes in length. Doubling the diameter has about the same effect as doubling the length of ferrite.

 

However, there is one possible advantage of going for length over diameter. Longer ferrite has greater effective permeability. Therefore one may need less Litz wire to attain the same value of inductance. Less wire equals less resistance equals better selectivity and gain. This improvement may be unmeasurable if losses in ferrite are dominant. On the other hand, Litz wire is expensive, so there may still be a cost advantage. It may be also easier to construct a longer ferrite sleeve than a fatter one.

 

I made my first “ferrite sleeve antenna” on the job in 2005 using 24 mix 61 ferrite rods 6 inches long. These rods originally were vendor samples that were candidates for cost reducing a radio. I built the antenna for the purpose of evaluating another radio prototype, and later, experimenting to see if it was possible to improve reception of MW  HD radio. I was using an ibiquity evaluation board. The idea was to overcouple to a tuned resonant antenna to create a two peaked response curve enhancing the two outermost iboc sidebands. The experiment worked beautifully but did not improve HD reception. Then with critical coupling it became a fantastic dx antenna for otherwise mediocre radios. This antenna eventually was donated to a middle school science program.


Re: WFNI 1070 Indianapolis (ex WIBC) going off 8/2

John
 

I used to hear both KNX and "the other station"  at night when I lived in New Mexico (and was listening to the CBS Radio Mystery Theater at night on KNX).  KNX almost always won the contest.  I was in the Central Coast area of Calif earlier this week and KNX is still a very strong presence on 1070.

John K5MO  (Now in NC)


On Wed, Jul 28, 2021 at 1:34 PM Dave Hascall <dhinfomedia@...> wrote:
If you are on the other MW lists and Facebook groups you probably already know but WFNI 1070, a 50 Kw/ 10 Kw station (formerly known as WIBC) is apparently set to stop transmitting on 2 August at midnight Eastern, 0400 UTC.  Per Emmis broadcasting, they are trying to sell the license. They said it might stay on seamlessly but doubt it.  There will probably be a dark or silent period.  Since it is a more prime clear channel it might be saleable.  We'll see but plan for it going off.

For me in Central Indiana, it was impenetrable during the day but pre sunrise and post sunset, others came in with SC and Sarnia often there.  I've heard KNX once when WIBC was off due to a traffic accident that knocked power off to the station.

73
Dave in Indy


Re: Introducing the ULR DXing Chart-Index

Pedro Porres
 

Hi all,
Lately I'm a bit busy moving to my new apartment, I still usually read your messages. I just sent Jorge a file with the 5 listeners requested. I realize that in relation to the proposed index, it is more interesting to capture low power stations, although closer, than distant stations but with high transmission power. I hope this activity will serve to encourage new fans of DX and radio.
Best regards to everyone.

Pedro Porres
Cordoba (Spain)


Re: Retekess V-115 FM/AM/SW Radio Review – July 2021

Tammy Walker
 

Hi, Paul.  I didn't see an answer to your question about the earphones and speaker, so here's my experience with it.  That doesn't happen on the two that I have.  One I grabbed on sale to use primarily for recording from other radios, so less experience with that one via earphones but no problems so far.  I've used the other one for a long while now pretty much exclusively with earphones, since it's the one I use when I unintentionally wake up at 4am and don't want to wake up my husband....  I also ended up getting a Koss VC20 volume control since the radio was too loud via earphones set to the lowest volume. 

A good radio for the purposes I have them for (recording and local strong AM/FM), but definitely a mess when I attached an external antenna. 

Hope this helps.

--
Tammy


Re: March 2021 South American Ultralight DXpedition by Martin Butera

Gary DeBock
 

On Wed, Jul 28, 2021 at 04:16 AM, radiojayallen wrote:
An amazing list considering he used only the Radiwow barefoot...really shows how the skill of the user is at least as important as the quality of the equipment. You gotta respect that!

Jay
Absolutely!

Any time a DXer gets outstanding results by extra effort using very basic equipment, he deserves a lot of praise. Other recent Ultralight radio examples are Peter in Botswana, and Paul in Alaska. Both of those guys face weather extremes in addition to the Ultralight radio challenge, and both deserve a ton of respect for their awesome results. Martin in Brazil is the latest example of this determined attitude-- which has made this group one of the most vibrant in the AM-DXing community.

Gary DeBock (in Puyallup, WA, USA)


  


WFNI 1070 Indianapolis (ex WIBC) going off 8/2

Dave Hascall
 

If you are on the other MW lists and Facebook groups you probably already know but WFNI 1070, a 50 Kw/ 10 Kw station (formerly known as WIBC) is apparently set to stop transmitting on 2 August at midnight Eastern, 0400 UTC.  Per Emmis broadcasting, they are trying to sell the license. They said it might stay on seamlessly but doubt it.  There will probably be a dark or silent period.  Since it is a more prime clear channel it might be saleable.  We'll see but plan for it going off.

For me in Central Indiana, it was impenetrable during the day but pre sunrise and post sunset, others came in with SC and Sarnia often there.  I've heard KNX once when WIBC was off due to a traffic accident that knocked power off to the station.

73
Dave in Indy


Re: ABC DRM Transmissions

Jorge Garzón
 

Some more info here...


Jorge Garzón Gutiérrez "IberiaDX" 
(EB7EFA · EA1036 SWL · BDXC Member 1409) 
QTH: IN83ag / 43º15' N · 03º56' W
Urb. San Roque 95, casa 5 (Villasevil)
39698 Santiurde de Toranzo (ESPAÑA - SPAIN)
..................................................................................
Blog: IberiaDX  · Twitter: @IberiaDX


En miércoles, 28 de julio de 2021 16:41:19 CEST, DX Pedro <pmm.andrade@...> escribió:


Really, Jorge? I thought India and Brasil were championing DRM, but mostly India after "killing" some (if not most) FM and AM stations They were making Receivers, implementing it on cars and tuk-tuks (of sorts) on a very "cheap way".
I do know China, Romania and (occasionally) BBC do make DRM broadcasts regularly.

// pedro andrade


On Tue, Jul 27, 2021 at 7:59 AM Jorge Garzón via groups.io <iberiaDX=yahoo.com@groups.io> wrote:
Hi Paul, 
I think remote receivers in the WebSDR network are DRM decoding capable. In case they are, you could decode it directly. 

In my opinion DRM is senseless and just adds noise to our already 'overnoised' AM band. India was one of the nations supporting this and they decided to give it up abruptly some months back. 
¡Saludos! 
J


El mar., jul. 27, 2021 a 3:36, Richard Allen via groups.io
<dx747j=me.com@groups.io> escribió:
I agree.  They only reason I can hear DRM is because it was included in the software I use to listen to my WiNRADiO SDR.  

You can have a listen to the difference between DRM and AM by going to:  https://www.drm.org/what-can-i-hear/

It seems their is a push to put DRM receivers in automobiles in some countries.  Here in the USA a lot of modern car radios can receive digital signals (not DRM) which are piggy-backed on the existing channels in the FM (88-108 MHz) band.  The receiver in my Toyota Tacoma can receive them where available.  They have tried something similar on the AM (540-1700 kHz) band here but it has fizzled.

Richard.

On Jul 26, 2021, at 18:34, Paul Blundell <tanger32au@...> wrote:


Thanks Richard, I don't have anything that can decode it. I am not sure why they are doing this as I don't think many people would be able to hear it.


Re: ABC DRM Transmissions

DX Pedro
 

Really, Jorge? I thought India and Brasil were championing DRM, but mostly India after "killing" some (if not most) FM and AM stations They were making Receivers, implementing it on cars and tuk-tuks (of sorts) on a very "cheap way".
I do know China, Romania and (occasionally) BBC do make DRM broadcasts regularly.

// pedro andrade


On Tue, Jul 27, 2021 at 7:59 AM Jorge Garzón via groups.io <iberiaDX=yahoo.com@groups.io> wrote:
Hi Paul, 
I think remote receivers in the WebSDR network are DRM decoding capable. In case they are, you could decode it directly. 

In my opinion DRM is senseless and just adds noise to our already 'overnoised' AM band. India was one of the nations supporting this and they decided to give it up abruptly some months back. 
¡Saludos! 
J


El mar., jul. 27, 2021 a 3:36, Richard Allen via groups.io
<dx747j=me.com@groups.io> escribió:
I agree.  They only reason I can hear DRM is because it was included in the software I use to listen to my WiNRADiO SDR.  

You can have a listen to the difference between DRM and AM by going to:  https://www.drm.org/what-can-i-hear/

It seems their is a push to put DRM receivers in automobiles in some countries.  Here in the USA a lot of modern car radios can receive digital signals (not DRM) which are piggy-backed on the existing channels in the FM (88-108 MHz) band.  The receiver in my Toyota Tacoma can receive them where available.  They have tried something similar on the AM (540-1700 kHz) band here but it has fizzled.

Richard.

On Jul 26, 2021, at 18:34, Paul Blundell <tanger32au@...> wrote:


Thanks Richard, I don't have anything that can decode it. I am not sure why they are doing this as I don't think many people would be able to hear it.


Re: Tecsun Australia Items

trrs73
 

Thanks and have a great day.

Tom Stiles


Re: March 2021 South American Ultralight DXpedition by Martin Butera

radiojayallen
 

An amazing list considering he used only the Radiwow barefoot...really shows how the skill of the user is at least as important as the quality of the equipment. You gotta respect that!

Jay


Re: Mobile Table Top

radiojayallen
 

I just googled Folding Card Table and found several with widely varying prices but the basic tables start at $30 and go up. Mine is a Samsonite which is about 30 years old and it has a vinyl soft top which is perfect.


Re: March 2021 South American Ultralight DXpedition by Martin Butera

Paul Blundell
 

Now that sounds like a great idea. I would be very keen. The world wide ultralight Radio DXing field day?


On Wed, 28 Jul 2021, 19:28 Jorge Garzón via groups.io, <iberiaDX=yahoo.com@groups.io> wrote:
Ji,
Great work from Martin!!
Perhaps there is not an evident two-way propagation happening every time we listen to the band. Theorically everything is possible, bit how and when almost impossible to predict.

Something never happened before was to organize a global MW DXP with UL/Small Portables and FSL. We could try one or two combined dates in the year and then combine and share together. Imagine... Peter in Central África, Gary in Oregon, Paul in Tasmania, Paul Logan in Eire, Alaska, and me in Spain/Portugal. That could be the first Worldwide MW UL DXP in the history.

73
--
Jorge Garzón (EB7EFA · EA1036 SWL) 
QTH: IN83ag / 43º15' N · 03º56' W
Urb. San Roque 95, casa 5 (Villasevil)
39698 Santiurde de Toranzo (ESPAÑA - SPAIN)
..................................................................................
Blog: IberiaDX  · Twitter: @IberiaDX


Re: Tecsun Australia Items

DX Pedro
 

Wow! that's such excellent stuff. I do think it should be mandatory on every purchase ;)
BTW: here's the link for downloadable files, including the Listeners guide: https://www.tecsunradios.com.au/store/radio-guides/
They also have another good read called The importance of shortwave. Worth reading.

// pedro andrade
/ DXPedro


On Wed, Jul 28, 2021 at 2:46 AM Paul Blundell <tanger32au@...> wrote:
Recently Tecsun Australia sent me a few items, they are a good seller of various radios and I have always found them excellent to deal with. 
What have been some of the best "radio freebies" you have received?
 


Re: March 2021 South American Ultralight DXpedition by Martin Butera

Jorge Garzón
 

Ji,
Great work from Martin!!
Perhaps there is not an evident two-way propagation happening every time we listen to the band. Theorically everything is possible, bit how and when almost impossible to predict.

Something never happened before was to organize a global MW DXP with UL/Small Portables and FSL. We could try one or two combined dates in the year and then combine and share together. Imagine... Peter in Central África, Gary in Oregon, Paul in Tasmania, Paul Logan in Eire, Alaska, and me in Spain/Portugal. That could be the first Worldwide MW UL DXP in the history.

73
--
Jorge Garzón (EB7EFA · EA1036 SWL) 
QTH: IN83ag / 43º15' N · 03º56' W
Urb. San Roque 95, casa 5 (Villasevil)
39698 Santiurde de Toranzo (ESPAÑA - SPAIN)
..................................................................................
Blog: IberiaDX  · Twitter: @IberiaDX

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