Date   

Longwave Ultralights

Kevin Schanilec
 

Hi all:

With the current surge of interest in longwave Ultralights, I did a little more research into what is available, other than the Tecsun PL-300WT, 310, 369, 380 and 606. The availability of these would have to verified before they are blessed as Ultralights, since wide availability is one of the criteria:

- Sony M37L, which tunes 153-279, but only in 9 khz steps. The UK seller I contacted doesn't ship outside the UK, so not sure these are widely avalable.
- Roberts Sport 925, Sports 924 (9924), and Sports 994 (9994): these analog models appear to be Sangean re-brands, and may be able to be aligned upwards to tune much higher than 280 khz.
- Roberts Sports 998: this appears to be a LW version of the Sangean DT-210, and presumably has a fixed 153-279 tuning range and perhaps 3 khz tuning steps at best?
- Roberts 9917: this digital set appears to be the Sangean DT-220 with LW, and apparently RDS for FM(!). I believe Gary reported that FM on the DT-220 was actually quite good, but that MW was quite lacking.
- Steepletone STR-616: the eBay seller claims to ship worldwide.

Anyone know what other models are out there??

Kevin S


Computer RFI problems-FARMERIK

Rik
 

My house hold computers are leaking RFI into the house wiring, and it is acting like an antenna for RFI where ever anything uses AC power.
I started looking around, and noticed at New Egg, some of the APC brand of outs/surge protectors sold for computers and home AV block 70 db of RFI. Also, split ferrite chokes can be fit over cables near computer devices. Higher ferrite mixture numbers are better for lower RF frequencies.

Anyone out there RFI proofed there house already, and have any pointers?

For now it looks like I should get RFI rated surge suppressors for each computer station and the server, as well as the TV and cable box. Also I should get a large number of the ferrite chokes for phone lines and all computer cables.

-FARMERIK


Re: Improving LW

Henk_Verdru
 

--- In ultralightdx@..., "Steve Ratzlaff" <steveratz@...> wrote:

Hi Henk,
Where do you obtain the SRF-M37L? I'm not familiar with that model, with the
LF?

Steve
Hi Steve,

the M37L is a European version (I guess) of the M37W with longwave in stead of the weather band. I bought one in 2007 in a Sony Centre in Belgium (for about 70 euros) and another one on Ebay (annanovauk, a UK-seller) for about 50 euros (+ P&P), last year. Right now on Ebay, "annovafr" (or annovauk) is offering a M37L for about 60 euros (+ P&P)
The main disadvantage of this radio (apart from the known selectivity problems of the M37W) is its limitation to a 9 or 10 khz AM tuning scheme, which means I have to listen to Europe1 on 180khz in stead of 183khz.

Henk


Re: A Couple New Stations Heard From The Arctic State of Oklahoma

Kirk <kirk74601@...>
 

Correction:
One of the loggings I just submitted contained a mispelled
QTH. Sorry...it should read:

660, KEYZ, Williston, ND, 1320 UTC, 1/9/11...
Kirk Allen
Ponca City, OK


A Couple New Stations Heard From The Arctic State of Oklahoma

Kirk <kirk74601@...>
 

Brrr, it's cold here in Oklahoma lately. I apologize for not reporting lately, but I think my hands are half frozen! Anyway, two new stations to report this time.

This one is Thanks To a Recent Tip From Richard Allen, my neighbor to the South!
660, KEYZ, Willston, ND, 1320 UTC, 1/9/11, weak sta here w/ C&W mx and lcl ads turned out to be this one! Although no official ID was hrd, the lcl ads tipped me to the ID w/ mentions of Willston and more than one mention of their area code 701. Thanks, Richard!

700, XEGD, Hidalgo de Parrall, Chihuahua, 0115-0140 UTC, 1/10/11, Hrd this mixing with XEETCH (Sonora) both in the null of a vy strong WLW. This one actually was dominant in the null for over half my listening time which yielded 3 "La Poderosa" IDs. From what I could tell, they were playing mostly bandera and a few romantica songs. Lots of lcl ads were hrd which did help in confirming the La Poderosa IDs.

73 to all and best of DX during what appears to be a very outstanding North American DX season!

Kirk Allen
Ponca City, OK


Re: Improving LW

Kevin Schanilec
 

Hey Steve/all:

I tried in the past to buy a M37L, but they are apparently only available in Europe, primarily in the UK, where they go for about $45 US plus whatever the shipping would be. KK Electronics claims to ship from the UK to the USA - I have an email into them just for kicks to see what it would cost overall.

The manual is here:
pdf.crse.com/manuals/3249146131.pdf
Unfortunately, the M37L only tunes 153-279 khz, which misses most of the NDB band here. Also, the tuning step is 9 khz, so even with the very wide filtering, the NDB coverage would be even more spotty.

Kevin

--- In ultralightdx@..., "Steve Ratzlaff" <steveratz@...> wrote:

Hi Henk,
Where do you obtain the SRF-M37L? I'm not familiar with that model, with the
LF?

Steve

----- Original Message -----
From: "Henk_Verdru" <henk.verdru@...>
To: <ultralightdx@...>
Sent: Tuesday, January 11, 2011 2:57 AM
Subject: [ultralightdx] Re: Improving LW




--- In ultralightdx@..., Russ Edmunds <wb2bjh@> wrote:

The longer the wavelength, the larger the antenna needed for good
reception. That's why the typical ultralight doesn't do well on LW. I'll
let others speak to what's available to help the signals.

Russ Edmunds
Correct, but this rule doesn't explain why the Tecsuns underperform on LW
in comparison with e.g. Sony's SRF-M37L (even with all its shortcomings)
which has a shorter antenna.

Henk



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

Yahoo! Groups Links



Re: Improving LW

Steve Ratzlaff <steveratz@...>
 

Hi Henk,
Where do you obtain the SRF-M37L? I'm not familiar with that model, with the LF?

Steve

----- Original Message -----
From: "Henk_Verdru" <henk.verdru@...>
To: <ultralightdx@...>
Sent: Tuesday, January 11, 2011 2:57 AM
Subject: [ultralightdx] Re: Improving LW




--- In ultralightdx@..., Russ Edmunds <wb2bjh@...> wrote:

The longer the wavelength, the larger the antenna needed for good reception. That's why the typical ultralight doesn't do well on LW. I'll let others speak to what's available to help the signals.

Russ Edmunds
Correct, but this rule doesn't explain why the Tecsuns underperform on LW in comparison with e.g. Sony's SRF-M37L (even with all its shortcomings) which has a shorter antenna.

Henk



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

Yahoo! Groups Links



Re: Random loggings - Central Oklahoma

Kevin Schanilec
 

Hi Peter:

Here is one source for Mexico:
http://www.amfmdx.net/amdx/corazondx.html

Kevin

--- In ultralightdx@..., Peter Laws <plaws0@...> wrote:

This is fun. I have only been listening at night for about an hour or
so before going to bed. Any ideas on 530? What's a good place to
find Mexican info? I have to guess from the frequency, since my
Spanish is very poor to non-existent. I found one list -- which lead
me to guess about XEWF -- but I think that was only "big" stations
with streaming content.

I was excited to hear the clock station from Cuba, too! Didn't
realize what it was until I heard the RR at the top of each minute.
Can't find the email from the other day that mentioned it though.

530 - SS YL with DEEP echo
540 - Jazz/EZL
540 - XEWF? - SS pub aff. "Voce del ...". "Hora Nationale"
567 - Clock station in Cuba
570 - KSNM, Las Cruces, NM - "Southern New Mexico" Fox Sports
580 - WIBW - Topeka, KS
1350 - KCAR, Clarksville, TX, 65 W @ night?? - Mike North sports



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


Re: Improving LW

Russ Edmunds <wb2bjh@...>
 

No mod is required ONLY if your receiver has an external antenna jack. If it does not then you have limited choices: 1) modify the radio; 2) resonate the antenna in close physical proximity to the radio's internal antenna to achieve improvement; or 3) ( may work, may not ) try wrapping a few turns of wire around the outside of the radio as if going around the internal antenna, and then connect the external antenna to the wire to achieve an inductive coupling.

Russ Edmunds
15 mi NNW of Philadelphia
Grid FN20id

FM: Yamaha T-80 & Onkyo T-450RDS w/ APS9B @15'; Grundig G8
AM:  Modified Sony ICF 2010's barefoot


--- On Tue, 1/11/11, balise2001 wrote:

From: balise2001
Subject: [ultralightdx] Re: Improving LW
To: ultralightdx@...
Date: Tuesday, January 11, 2011, 9:39 AM

 

Hi Farmerik,

Thanks for your comments.

I may be wrong due to my limited english, but what I understood is that Gary's loopsticks don't need any mod' ONLY when used with a PL-360.

Gary wrote : "Although the 7.5" LW loopsticks were designed for the PL-360 model, they will work with any Tecsun DSP Ultralight radio once the circuitry is modified to accept the loopstick in place of the stock ferrite bar. The PL-310 external antenna connector can be rewired to accomplish this (...)"

Regards,
Patrick, south-east France


--- In ultralightdx@..., "farmerik" wrote:
>
> I have both Gary's LW and MW antennas for the PL-360. They plug right into the external antenna jack to replace the tiny little one from the factory. I also have the Q-stick which couples to any ferrite antenna in a radio. The jack on the Q-stick allows me to plug a long wire or Beverage antenna into the jack, and use the Q-stick to couple the signal from the wire antenna to the ferrite antenna inside a radio. None of those set ups require any modification of the radio it self. - FARMERIK
>
> --- In ultralightdx@..., "balise2001" aunumero13@ wrote:
> >
> > Hi Gary,
> >
> > Many thanks for your kind reply (as usual !)
> >
> > Your LW-design loopstick also looks fine and effective but it seems one has to modify the receiver in order to use it, right ?
> > The problem is I'm not a technie, and I don't want to open and tinker with the radio... actually, I do not feel competent to do this meticulous work.
> >
> > Thus, I would probably be wiser to order a ready-to-use antenna such as the Q-stick Henk has recommanded.
> >
> > Patrick
> >
> >
> > --- In ultralightdx@..., D1028Gary@ wrote:
> > >
> > > Hi Patrick,
> > >
> > > Thanks for your message, and also for your private emails concerning the
> > > PL-310 (your questions will be answered privately, soon).
> > >
> > > Concerning the LW-design 7.5" loopsticks for the Tecsun DSP models, I have
> > > developed a sensitive LW loopstick with a plug-in style connector, designed
> > > to fit the Tecsun PL-360 model (which has a loopstick plug-in jack).
> > > Detailed experimentation was run with five different LW loopstick designs
> > > (pictured at _http://www.mediafire.com/i/?iv32u55b1ieyd5p_
> > > (http://www.mediafire.com/i/?iv32u55b1ieyd5p) ), and I am personally using the "E" model (a 1900
> > > uh coil of 100/45 Litz wire on a Type 33 ferrite bar) for NDB reception. So
> > > far, I have logged NDB stations in 5 states and 4 Canadian provinces with
> > > this 7.5" loopstick, including a 250w station in the Canadian province of
> > > Manitoba (248-WG). This particular design has sensitive coverage of the LW
> > > broadcast band (153-279 kHz) and the NDB frequencies up to about 450 kHz. So
> > > far, I've taken about 15 orders for these LW loopsticks, but could make
> > > one more for you, Patrick, if you are willing to wait.
> > >
> > > Although the 7.5" LW loopsticks were designed for the PL-360 model, they
> > > will work with any Tecsun DSP Ultralight radio once the circuitry is
> > > modified to accept the loopstick in place of the stock ferrite bar. The PL-310
> > > external antenna connector can be rewired to accomplish this (the Laurie Mann
> > > modification), and my own Longwave NDB chaser is a modified PL-380, with a
> > > cabinet attachment to accept the LW and MW 7.5" plug-in loopsticks
> > > (pictured below).
> > >
> > > 73 and Good DX,
> > > Gary DeBock (in Puyallup, WA, USA)
> >
>


Re: Random loggings - Central Oklahoma

Stephen Ponder <stephen_ponder@...>
 

Peter,
A website that I use a lot for Mexican DX is:


Fred Cantu maintains that website and updates it frequently.

Another resource I use is the IRCA's Mexican Log. The newest
edition is available now (10th edition, Winter 2010) from the IRCA
Bookstore for $11.50, $9.50 if you're an IRCA member. The IRCA
website is:


73,
Steve Ponder, N5WBI
Houston, TX
----------------------

On Jan 11, 2011, at 9:56 AM, Peter Laws <plaws0@...> wrote:

 

This is fun. I have only been listening at night for about an hour or
so before going to bed. Any ideas on 530? What's a good place to
find Mexican info? I have to guess from the frequency, since my
Spanish is very poor to non-existent. I found one list -- which lead
me to guess about XEWF -- but I think that was only "big" stations
with streaming content.

I was excited to hear the clock station from Cuba, too! Didn't
realize what it was until I heard the RR at the top of each minute.
Can't find the email from the other day that mentioned it though.

530 - SS YL with DEEP echo
540 - Jazz/EZL
540 - XEWF? - SS pub aff. "Voce del ...". "Hora Nationale"
567 - Clock station in Cuba
570 - KSNM, Las Cruces, NM - "Southern New Mexico" Fox Sports
580 - WIBW - Topeka, KS
1350 - KCAR, Clarksville, TX, 65 W @ night?? - Mike North sports

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


Re: Random loggings - Central Oklahoma

Peter Laws
 

On Tue, Jan 11, 2011 at 09:56, Peter Laws <plaws@...> wrote:

I was excited to hear the clock station from Cuba, too!  Didn't
realize what it was until I heard the RR at the top of each minute.
Can't find the email from the other day that mentioned it though.

 567 - Clock station in Cuba
I see that this was actually Radio Reloj 570. Still, very cool and
just a leetle bit creepy.

I had assumed that all but US/Canada/Mexico was on the 9-kHz step. I
guess it's actually all of Region 2?



 570 - KSNM, Las Cruces, NM - "Southern New Mexico"  Fox Sports



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


Re: Improving LW

balise2001 <aunumero13@...>
 

Thanks for this info Russ.
Well, I suppose similar products can be found in Europe as well !

If EU members can help, and recommand a good 'Q-stick' style antenna available here...


TIA.
Patrick

--- In ultralightdx@..., Russ Edmunds <wb2bjh@...> wrote:

The Q-Stick is only available from Radio Plus in Florida.

Russ Edmunds
15 mi NNW of Philadelphia
Grid FN20id
<wb2bjh@...>
FM: Yamaha T-80 & Onkyo T-450RDS w/ APS9B @15'; Grundig G8
AM:  Modified Sony ICF 2010's barefoot


Random loggings - Central Oklahoma

Peter Laws
 

This is fun. I have only been listening at night for about an hour or
so before going to bed. Any ideas on 530? What's a good place to
find Mexican info? I have to guess from the frequency, since my
Spanish is very poor to non-existent. I found one list -- which lead
me to guess about XEWF -- but I think that was only "big" stations
with streaming content.

I was excited to hear the clock station from Cuba, too! Didn't
realize what it was until I heard the RR at the top of each minute.
Can't find the email from the other day that mentioned it though.

530 - SS YL with DEEP echo
540 - Jazz/EZL
540 - XEWF? - SS pub aff. "Voce del ...". "Hora Nationale"
567 - Clock station in Cuba
570 - KSNM, Las Cruces, NM - "Southern New Mexico" Fox Sports
580 - WIBW - Topeka, KS
1350 - KCAR, Clarksville, TX, 65 W @ night?? - Mike North sports



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


PL-606 backlight?

Peter Laws
 

Anyone figured out if there is a hidden option to keep the backlight
on at all times? I was hoping that it would if the unit was plugged
in, but alas (I also confirmed that there is no data seen on the USB
wire ... darn. :)

Pushing and holding the "FM ST." / "AM BW" button with the unit off
does a display test, so I was hoping someone had found a similar key
combo that latched the light.

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


Re: South Dakota catch

Allen Willie
 

RE:

This is a new station for the all-time log, and while I have heard SD before elsewhere on the dial, this is the first SD station, and state #23, for the barefoot ULR log.
Kevin S
Bainbridge Island, WA


Kevin,

Nice catch on South Dakota. I've been trying for that one for what seems like forever.

North Dakota has been heard here and out at Old Perlican on the Dxpeditions but South Dakota still remains elusive on the ULR's

KOTA in Rapid City was heard a few years back but not on Ultralight.


Good DX

Allen Willie
St. John's, Newfoundland
http://nldxers.110mb.com/


Re: Best Audio Quality FM Portable with DX Capability... (OT => bigger radio ?)

Charly <calpublic@...>
 


Hi Rick,

Thanks for this input. Since Tecsun is a major radio producer around here (Grundig/Eton radios are often Tecsun's rebranded radios), this can perhaps explain the similarities in the audio design ?

My question is the following : How do you rate the audio quality (and circuitry) of larger radios such as : Sony 7600GR, Sangean 909, Degen 1103/ Grundig/Eton G5 & G3 compared to ULR ????

Thanks,

Charly

--------------------------------------
From: Rick Robinson
Date: Tue, 11 Jan 2011 10:08:29 -0500
To: ultralightdx@...
Cc:
Subject: [ultralightdx] Re: Best Audio Quality FM Portable with DX Capability...

On 1/10/2011 11:19 PM, dhsatyadhana wrote:
...and this just in!  I just tried out all of my ULRs with my Grado SR-60 "near-audiophile" and fairly power-hungry headphones, with the volume attenuator.  I did A/B tests on various stations here in the Seattle area, and the clear winner from an audio perspective is...
What could cause significant differences in audio when all these small 
portables, Eton, CCrane, Tecsun, that I've dissected use the same CD1622 
audio output chip and the same value caps, resistors, etc. in the audio 
circuits?   The circuits are all identical in the 7 different radios 
I've examined and are straight out of the CD1622 datasheet posted in the 
files section.  Using quality headphones is obviously the way to test 
them, but it still leaves me wondering what the determining factors 
could be.   Kiwa and Big Sky Audio have kits to improve the audio in 
communications receivers which involve replacing polarized electrolytic 
caps in the audio stages with non-polarized electroylitics and ceramic 
caps with mylar.  I could understand if Tecsun was using a better 
quality cap, or design, than say Eton, but from what I've seen, that 
isn't the case.  Maybe it's just a case of variables in the particular 
batch of CD1622s, caps, etc.  In that case, my PL-380, or CCrane SWP may 
be my audio winner.  Using good headphones is definitely the way to 
enjoy FM and also pull out the weak ones while DXing MW.

The CD1622 is made for low coast small footprint portables not for 
audiophile quality sound.  Anyone looking for sound comparable to high 
end tuners is not going to find it in a $50 portable radio.  These are 
truly "pedestrian" radios meant to sell at a price that the average 
Chinese worker can afford and not aimed at the US/European audiophile.

I would think Silicon Labs has a high standard of quality control and 
the audio response out of one Si4734 would be very close to that of 
another.

Anyone else have any ideas regarding what Kevin and others are noting?

Rick W4DST


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Re: Best Audio Quality FM Portable with DX Capability...

Kevin Schanilec
 

Thanks Rick for your usual sharp insights! I agree - quality control may be the issue here, even though Tecsun seems to be pretty consistent from batch to batch.

Those who have multiple Tecsuns, any conclusions on audio quality from radio to radio??

Kevin

--- In ultralightdx@..., Rick Robinson <w4dst@...> wrote:

On 1/10/2011 11:19 PM, dhsatyadhana wrote:
...and this just in! I just tried out all of my ULRs with my Grado SR-60 "near-audiophile" and fairly power-hungry headphones, with the volume attenuator. I did A/B tests on various stations here in the Seattle area, and the clear winner from an audio perspective is...
What could cause significant differences in audio when all these small
portables, Eton, CCrane, Tecsun, that I've dissected use the same CD1622
audio output chip and the same value caps, resistors, etc. in the audio
circuits? The circuits are all identical in the 7 different radios
I've examined and are straight out of the CD1622 datasheet posted in the
files section. Using quality headphones is obviously the way to test
them, but it still leaves me wondering what the determining factors
could be. Kiwa and Big Sky Audio have kits to improve the audio in
communications receivers which involve replacing polarized electrolytic
caps in the audio stages with non-polarized electroylitics and ceramic
caps with mylar. I could understand if Tecsun was using a better
quality cap, or design, than say Eton, but from what I've seen, that
isn't the case. Maybe it's just a case of variables in the particular
batch of CD1622s, caps, etc. In that case, my PL-380, or CCrane SWP may
be my audio winner. Using good headphones is definitely the way to
enjoy FM and also pull out the weak ones while DXing MW.

The CD1622 is made for low coast small footprint portables not for
audiophile quality sound. Anyone looking for sound comparable to high
end tuners is not going to find it in a $50 portable radio. These are
truly "pedestrian" radios meant to sell at a price that the average
Chinese worker can afford and not aimed at the US/European audiophile.

I would think Silicon Labs has a high standard of quality control and
the audio response out of one Si4734 would be very close to that of
another.

Anyone else have any ideas regarding what Kevin and others are noting?

Rick W4DST


Re: Improving LW

Kevin Schanilec
 

Bonjour, Patrick:

C'est vrai! The PL-310 needs a modification, while the PL-360 has a built-in antenna jack that will accept the external antenna. The PL-360 is the only Ultralight (s0 far) that has this feature.

The PL-310 modification is quite an easy one if you have any soldering skills, or would not be a huge imposition on a friend that does have soldering skills :-) See "PL-310 External LW MW Antenna Mod.pdf" in Folder 6, "Alignment and Modification" here on the Group.

Regards - Kevin

--- In ultralightdx@..., "balise2001" <aunumero13@...> wrote:

Hi Farmerik,
Thanks for your comments.
I may be wrong due to my limited english, but what I understood is that
Gary's loopsticks don't need any mod' ONLY when used with a PL-360.
Gary wrote : "Although the 7.5" LW loopsticks were designed for the
PL-360 model, they will work with any Tecsun DSP Ultralight radio once
the circuitry is modified to accept the loopstick in place of the stock
ferrite bar. The PL-310 external antenna connector can be rewired to
accomplish this (...)"
Regards,Patrick, south-east France

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

I have both Gary's LW and MW antennas for the PL-360. They plug right
into the external antenna jack to replace the tiny little one from the
factory. I also have the Q-stick which couples to any ferrite antenna in
a radio. The jack on the Q-stick allows me to plug a long wire or
Beverage antenna into the jack, and use the Q-stick to couple the signal
from the wire antenna to the ferrite antenna inside a radio. None of
those set ups require any modification of the radio it self. - FARMERIK

--- In ultralightdx@..., "balise2001" aunumero13@ wrote:

Hi Gary,

Many thanks for your kind reply (as usual !)

Your LW-design loopstick also looks fine and effective but it seems
one has to modify the receiver in order to use it, right ?
The problem is I'm not a technie, and I don't want to open and
tinker with the radio... actually, I do not feel competent to do this
meticulous work.

Thus, I would probably be wiser to order a ready-to-use antenna such
as the Q-stick Henk has recommanded.

Patrick


--- In ultralightdx@..., D1028Gary@ wrote:

Hi Patrick,

Thanks for your message, and also for your private emails
concerning the
PL-310 (your questions will be answered privately, soon).

Concerning the LW-design 7.5" loopsticks for the Tecsun DSP
models, I have
developed a sensitive LW loopstick with a plug-in style connector,
designed
to fit the Tecsun PL-360 model (which has a loopstick plug-in
jack).
Detailed experimentation was run with five different LW loopstick
designs
(pictured at _http://www.mediafire.com/i/?iv32u55b1ieyd5p_
(http://www.mediafire.com/i/?iv32u55b1ieyd5p) ), and I am
personally using the "E" model (a 1900
uh coil of 100/45 Litz wire on a Type 33 ferrite bar) for NDB
reception. So
far, I have logged NDB stations in 5 states and 4 Canadian
provinces with
this 7.5" loopstick, including a 250w station in the Canadian
province of
Manitoba (248-WG). This particular design has sensitive coverage
of the LW
broadcast band (153-279 kHz) and the NDB frequencies up to about
450 kHz. So
far, I've taken about 15 orders for these LW loopsticks, but
could make
one more for you, Patrick, if you are willing to wait.

Although the 7.5" LW loopsticks were designed for the PL-360
model, they
will work with any Tecsun DSP Ultralight radio once the circuitry
is
modified to accept the loopstick in place of the stock ferrite
bar. The PL-310
external antenna connector can be rewired to accomplish this (the
Laurie Mann
modification), and my own Longwave NDB chaser is a modified
PL-380, with a
cabinet attachment to accept the LW and MW 7.5" plug-in loopsticks
(pictured below).

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


Re: Best Audio Quality FM Portable with DX Capability...

Rick Robinson <w4dst@...>
 

On 1/10/2011 11:19 PM, dhsatyadhana wrote:
...and this just in! I just tried out all of my ULRs with my Grado SR-60 "near-audiophile" and fairly power-hungry headphones, with the volume attenuator. I did A/B tests on various stations here in the Seattle area, and the clear winner from an audio perspective is...
What could cause significant differences in audio when all these small portables, Eton, CCrane, Tecsun, that I've dissected use the same CD1622 audio output chip and the same value caps, resistors, etc. in the audio circuits? The circuits are all identical in the 7 different radios I've examined and are straight out of the CD1622 datasheet posted in the files section. Using quality headphones is obviously the way to test them, but it still leaves me wondering what the determining factors could be. Kiwa and Big Sky Audio have kits to improve the audio in communications receivers which involve replacing polarized electrolytic caps in the audio stages with non-polarized electroylitics and ceramic caps with mylar. I could understand if Tecsun was using a better quality cap, or design, than say Eton, but from what I've seen, that isn't the case. Maybe it's just a case of variables in the particular batch of CD1622s, caps, etc. In that case, my PL-380, or CCrane SWP may be my audio winner. Using good headphones is definitely the way to enjoy FM and also pull out the weak ones while DXing MW.

The CD1622 is made for low coast small footprint portables not for audiophile quality sound. Anyone looking for sound comparable to high end tuners is not going to find it in a $50 portable radio. These are truly "pedestrian" radios meant to sell at a price that the average Chinese worker can afford and not aimed at the US/European audiophile.

I would think Silicon Labs has a high standard of quality control and the audio response out of one Si4734 would be very close to that of another.

Anyone else have any ideas regarding what Kevin and others are noting?

Rick W4DST


Re: Improving LW

balise2001 <aunumero13@...>
 

Bonjour Charly !

It's about the same here (near Chambery) under daylight conditions.
Only 162, 183, 216 and 234 are audible (both France Inter and RMC being pretty weak).

I did not purchase this unit for its LW abilities neither, but I would still improve its sensitivity to catch some NDBs in the 280-500 kHz range.

MW is far better (though it's a powerful station, Saudi Arabia on 1521 is an easy catch in the evening). Just for fun, I also intend to catch the largest number of MW stations.

Regards,
Patrick

--- In ultralightdx@..., Charly <calpublic@...> wrote:


Hi everyone, et bonjour aux francophones,

I've tested LW this morning from the Paris area with my PL-390 (with a
longer loopstick than the PL-310 ?) :
- 162 : very good
- 234 : very good

Nothing else so far, only a few mumble sometime but not possible to
identified.

Very disappointing, but I did not buy it for LW so I don't mind. It was
the first time I switched my radio to LW ;-). In MW I can catch most of
western Europe (didn't try DX so far).

By the way, on the PL-390, the antenna input jack is labeled "SW ant".
Does this mean that the internal loopstick remains active when the radio
is used for MW & LW ?

Best regards,

Charly