Date   

Re: Tecsun/si4734 tuning range.

jerry_popiel
 

Michael, it was one of those forced on you type of Upgrade / changes which is a complete step backwards instead of an improvement  its NOT.  Not sure what I can do to improve things.
 
Thanks
Jerry 

From: Michael To: ultralightdx@...
Sent: Thursday, September 15, 2011 5:01:26 PM
Subject: Re: [ultralightdx] Tecsun/si4734 tuning range.

 
Jerry, are you using a new version of yahoo mail?
Just recently, on opening your postings in Outlook Express,
there is a blank space at the top, which only reveals text when I left-click
over it. The quoted text from Eberhard was there as normal, however.
I note the same effect from a yahoo.co.uk email.

Anybody else observe this? Using which email client?

Curiously,
Michael





Re: 200 stations ULR

Allen Willie
 

RE:

Hi

Les enfants, on passe le cap des 200 en ultralight !!
Finally we reached the 200 mark in ULR !!

*1323 Voice of Russia in French Wachenbrunn D #200

*1161 Magic 1161 Goxhill (near Hull) G #201

*1161 Tay AM Dundee G , no positive ID but Celtic melodies on accordeon and then bagpipes track, who else can it be ? #202 (cornemuses !!)

Patrice Privat



Patrice,

Congratulations on reaching the 200 stations heard on Ultralight.

Wishing you many more to come your way !!


Regards

Allen Willie & Dianne Froude
Bristol's, Hope, Newfoundland


Need Help with a PL-600 and MTM Loop

John Smith
 

I just finished an MTM Loop today and have tried it with my PL-600. However, I hear no improvement. I have placed the radio within the loop, pointed the long side of the radio at the center of the loop, and had the two antennae in a collinear fashion. Tuning the cap shows no improvement in the signal or distinct peak.

What could I be doing wrong? I verified the solder connection to the capacitor thinking it may not be a sound join.

Any help would be appreciated.

Thank You
jje64


Re: A Dynamite SR Skip Session--5 New Stations Logged

bbwrwy
 

Kirk:

Allow me to offer my congratulations on reaching and passing the 800 stations heard mark. Best wishes for many more.

Richard.

Richard Allen
near Perry OK USA


Re: Tecsun/si4734 tuning range.

Michael <michael.setaazul@...>
 

"...switch selected MOS capacitors, ( not varactor)."

I hadnt noticed this before and thought I read somewhere
that the RF was internally varactor-tuned, although I was
impressed with the range of capacity possible in such small
physical dimensions.

How does it work with MOS capacitors?
What increments of capacity?
Any parallel varactor for fine tuning?
How accurate is the tracking?

Michael UK

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

From: dhsatyadhana
To: ultralightdx@...
Sent: 15 September 2011 22:57
Subject: [ultralightdx] Re: Tecsun/si4734 tuning range.


Thanks for spotting the apparent capacitance range of the Si4734, Eb - this is good info. That is
an impressive tuning range.

For a 17 pf top end (7 MOS plus 10 distributed), a 554 uH coil would resonate at 1640 khz. So, just
short of the top end of the band, consistent with what Steve found, namely that sensitivity started
to fall off by 1700 khz.

Kevin S
Bainbridge Island, WA

--- In ultralightdx@..., "EBERHARD" <ebkeller@...> wrote:

The tuning range of these radios is rather simple to define
if capacitance range and inductance are known.
As shown in Phil's artile "Si4734 Hardware Guide",in
message #14899,follow link to his website,the cap range
is ~ 7pf to 590pf,switch selected MOS capacitors,(not varactor).
I suggest to add ~10pf to these values to account for coil
distributed c.
For the 1700mH LW rod this calculates to a frequency range
of 157kHz to 936Khz.I use an on-line calculator here:
http://www.whatcircuits.com/lc-resonance-frequency-calculator

Accurate inductance measurement is more difficult.I own several
hand-held lc/lcr meters and find most to have greater than
stated errors.My meters include the DM4070(+6.3%),and
AADE IIB (+4%).This applies to only my meters,others may be better.
I make my measurements for max accuracy,on a 4342A Q-meter,
using resonance of a tank circuit with a large precision
capacitor(i.e. 3000pf<1%,or 5000pf<0.5%)finding L with above
calculator.(I don't do math!)
I hope this is helpful to some,
Eb.


Re: Tecsun/si4734 tuning range.

eberhard keller
 

Hi Jerry,using the effective cap range of 17pf to 600pf,
simply enter these values and any inductance you wish to
investigate into the blocks on the calculator pictorial
and click "calculate", and read the inductance.Modify the
"f" reading to "kHz".Enter any two known parameters
and "calculate" the third.
For 550uH/17pf f=1646kHz, for 550uH/600pf f=277kHz.
HAPPY CALCULATING!
Eb.

--- In ultralightdx@..., Jerry Popiel <jerry_popiel@...> wrote:

EBERHARD, what frequency range does in calculate to for a 540 - 550 uH Inductance Coil on a 7.5 Inch Ferrite Rod which some of us are constructing?
 
Thanks
Jerry


Re: Tecsun/si4734 tuning range.

Michael <michael.setaazul@...>
 

Jerry, are you using a new version of yahoo mail?
Just recently, on opening your postings in Outlook Express,
there is a blank space at the top, which only reveals text when I left-click
over it. The quoted text from Eberhard was there as normal, however.
I note the same effect from a yahoo.co.uk email.

Anybody else observe this? Using which email client?

Curiously,
Michael


Re: Tecsun/si4734 tuning range.

Kevin Schanilec
 

Thanks for spotting the apparent capacitance range of the Si4734, Eb - this is good info. That is an impressive tuning range.

For a 17 pf top end (7 MOS plus 10 distributed), a 554 uH coil would resonate at 1640 khz. So, just short of the top end of the band, consistent with what Steve found, namely that sensitivity started to fall off by 1700 khz.

Kevin S
Bainbridge Island, WA

--- In ultralightdx@..., "EBERHARD" <ebkeller@...> wrote:

The tuning range of these radios is rather simple to define
if capacitance range and inductance are known.
As shown in Phil's artile "Si4734 Hardware Guide",in
message #14899,follow link to his website,the cap range
is ~ 7pf to 590pf,switch selected MOS capacitors,(not varactor).
I suggest to add ~10pf to these values to account for coil
distributed c.
For the 1700mH LW rod this calculates to a frequency range
of 157kHz to 936Khz.I use an on-line calculator here:
http://www.whatcircuits.com/lc-resonance-frequency-calculator

Accurate inductance measurement is more difficult.I own several
hand-held lc/lcr meters and find most to have greater than
stated errors.My meters include the DM4070(+6.3%),and
AADE IIB (+4%).This applies to only my meters,others may be better.
I make my measurements for max accuracy,on a 4342A Q-meter,
using resonance of a tank circuit with a large precision
capacitor(i.e. 3000pf<1%,or 5000pf<0.5%)finding L with above
calculator.(I don't do math!)
I hope this is helpful to some,
Eb.


Re: 200 et plus

Michael <michael.setaazul@...>
 

Flicitations, Patrice!

And I love the quotation. Keep em coming!
Unfortunately, France Culture etc are not
on AM, so I have to cheat and listen on wifi...

Michael

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

From: patrice.privat

Les enfants, on passe le cap des 200 en ultralight !!

Les femmes ont de ces puissances d'oubli momentan ;
elles disent leurs souvenirs : "vous repasserez demain",
et ils obissent.

Villiers de L'Isle Adam "Maryelle"


Re: 200 et plus

Kevin Schanilec
 

Patrice:

Tres formidable! Félicitations pour cette réalisation (and thanks to Google for having a translate function...)

Kevin S
Bainbridge Island, WA

--- In ultralightdx@..., "patrice.privat" <patrice.privat@...> wrote:

Hi

Les enfants, on passe le cap des 200 en ultralight !!
Finally we reached the 200 mark in ULR !!

*1323 Voice of Russia in French Wachenbrunn D #200

*1161 Magic 1161 Goxhill (near Hull) G #201

*1161 Tay AM Dundee G , no positive ID but Celtic melodies on accordeon and then bagpipes track, who else can it be ? #202 (cornemuses !!)

Patrice Privat

Beauvais

Les femmes ont de ces puissances d'oubli momentané ; elles disent à leurs souvenirs : "vous repasserez demain", et ils obéissent.
Villiers de L'Isle Adam "Maryelle"


Re: Tecsun/si4734 tuning range.

jerry_popiel
 

EBERHARD, what frequency range does in calculate to for a 540 - 550 uH Inductance Coil on a 7.5 Inch Ferrite Rod which some of us are constructing?
 
Thanks
Jerry

From: EBERHARD
To: ultralightdx@...
Sent: Thursday, September 15, 2011 4:13:45 PM
Subject: [ultralightdx] Tecsun/si4734 tuning range.

 
The tuning range of these radios is rather simple to define
if capacitance range and inductance are known.
As shown in Phil's artile "Si4734 Hardware Guide",in
message #14899,follow link to his website,the cap range
is ~ 7pf to 590pf,switch selected MOS capacitors,(not varactor).
I suggest to add ~10pf to these values to account for coil
distributed c.
For the 1700mH LW rod this calculates to a frequency range
of 157kHz to 936Khz.I use an on-line calculator here:
http://www.whatcircuits.com/lc-resonance-frequency-calculator

Accurate inductance measurement is more difficult.I own several
hand-held lc/lcr meters and find most to have greater than
stated errors.My meters include the DM4070(+6.3%),and
AADE IIB (+4%).This applies to only my meters,others may be better.
I make my measurements for max accuracy,on a 4342A Q-meter,
using resonance of a tank circuit with a large precision
capacitor(i.e. 3000pf<1%,or 5000pf<0.5%)finding L with above
calculator.(I don't do math!)
I hope this is helpful to some,
Eb.




Tecsun/si4734 tuning range.

eberhard keller
 

The tuning range of these radios is rather simple to define
if capacitance range and inductance are known.
As shown in Phil's artile "Si4734 Hardware Guide",in
message #14899,follow link to his website,the cap range
is ~ 7pf to 590pf,switch selected MOS capacitors,(not varactor).
I suggest to add ~10pf to these values to account for coil
distributed c.
For the 1700mH LW rod this calculates to a frequency range
of 157kHz to 936Khz.I use an on-line calculator here:
http://www.whatcircuits.com/lc-resonance-frequency-calculator

Accurate inductance measurement is more difficult.I own several
hand-held lc/lcr meters and find most to have greater than
stated errors.My meters include the DM4070(+6.3%),and
AADE IIB (+4%).This applies to only my meters,others may be better.
I make my measurements for max accuracy,on a 4342A Q-meter,
using resonance of a tank circuit with a large precision
capacitor(i.e. 3000pf<1%,or 5000pf<0.5%)finding L with above
calculator.(I don't do math!)
I hope this is helpful to some,
Eb.


200 et plus

patrice.privat
 

Hi
 
Les enfants, on passe le cap des 200 en ultralight !!
Finally we reached the 200 mark in ULR  !!
 
*1323 Voice of Russia in French Wachenbrunn D  #200
 
*1161 Magic 1161 Goxhill (near Hull) G #201
 
*1161 Tay AM Dundee G , no positive ID but Celtic melodies on accordeon and then bagpipes track, who else can it be ?  #202 (cornemuses !!)
 
Patrice Privat
 
Beauvais
 
Les femmes ont de ces puissances d'oubli momentané ; elles disent à leurs souvenirs : "vous repasserez demain", et ils obéissent.
Villiers de L'Isle Adam "Maryelle"
 
 
 
 
 
 
 


TECH: Scotch Blue Painter's Tape good for ferrite rod coil forms

Steve Ratzlaff <steveratz@...>
 

Yesterday I bought a roll of 2" wide Scotch Blue Painter's Tape. I've made several coil forms and wound coils for the ferrite rod with it now and it works great and should be a suitable replacement for the 2" Johnson & Johnson discontinued adhesive tape. It has good adhesion and the coil turns hold without slipping like the J&J tape did. It's thinner so 3-4 wraps are needed for the coil. And as with all these coils, use the rod as the form and wrap 2 turns of paper on the rod before using the tape to make the coil. Otherwise the coil is likely to be too tight after winding and can't be moved on the rod. (After winding, slip the coil off, remove the tape wrap, then replace the coil on the rod.)
I had previously tried another brand of blue painter's tape--this had little adhesion and made a lousy coil form, so based on my experience with two brands, go with the Scotch brand.

Steve
NE Oregon


Re: One More New Sta Logged at SR

robert ross
 

Kirk.......

I'm trying to stay ahead of you on the ULR's Logged List...and every time I log a new One...you do too!! HAHHAHHA Sometimes you log 3-4 New Ones!! You're really making this difficult eh!!

Maybe we should switch Locations for a few Months......then we'd both log a bunch of new Ones!! But....I don't want to take over your Job...I just wanna stay Retired!! HAAHAHA

All those Mexicans you log would drive me Buggy trying to figure out who they are though......Even that Spanish Station I heard from Louisiana last night took a Long time to figure out who it was!! I guess the more you hear...the better you get at Identifying them eh???? I used to do better IDing African Shortwave Stations broadcasting in Swahili...than those Dang Rapid Fire Spanish Stations!!! My Brain can't process SS Talk going that fast!! HA!!

Have Fun Amigo.......

73....ROB VA3SW

Robert S. Ross
London, Ontario CANADA
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>


On 2011-09-15, at 10:14 AM, Kirk wrote:

 

Hi All,

My thanks to everyone who's sharing their latest radio wisdom and DX catches! Some really good loggings going on in the last few weeks.

One new station to report from this morning's SR DX session, and once again it was thanks to a tip from my neighbor, Richard Allen. Tnx, buddy!

1050, KTBL, Los Ranchos, NM, 1136 UTC, 9/15/11, some sort of talk show was going on here. Noted three clear call letter IDs and some lcl ads. They had a PSA "to strengthen our community." XEG was very weak during this time which is highly unusual here. In this case I was happy to NOT hear an XE, ha ha. ULR Sta #806-

1020, UNID SS Sta (Sounds like an XE), 1224 UTC, 9/15/11, there were TWO SS stations in here this morning. The strongest one was ID'd as XEOU, Huajuapan, Oaxaca (relog) identifying as "La Primera, XEOU." The other SS sta was mostly all tlk just like XEOU, so it was hard to tell who was saying what. I'm suspecting this might have been XEWO from Chetumal, Quintana Roo, but that remains to be solved another day. These were hrd in the null from semi-lcl KOKP, Perry, OK. I guess I can't depend on Richard to solve this one...KOKP is practically in his back yard! (or is that the front yard, Richard?)

After 1200 UTC, there were several signals present from what I presume to be Asia. A weak sig was hrd on 747 presumably from JOIB, Sapporo. Also a weak signal was hrd on 972 from maybe South Korea(?) The signal left the air right at 1230 UTC. A pretty healthy carrier was also noted on 999 kHz. The only sta I'm aware of that might be a possibility there would be KCBS from Pyongyang. I wish I could report some audio from these, but that wasn't the case...yet!

73 to everyone!!

Kirk Allen
Ponca City, OK


One More New Sta Logged at SR

Kirk
 

Hi All,

My thanks to everyone who's sharing their latest radio wisdom and DX catches! Some really good loggings going on in the last few weeks.

One new station to report from this morning's SR DX session, and once again it was thanks to a tip from my neighbor, Richard Allen. Tnx, buddy!

1050, KTBL, Los Ranchos, NM, 1136 UTC, 9/15/11, some sort of talk show was going on here. Noted three clear call letter IDs and some lcl ads. They had a PSA "to strengthen our community." XEG was very weak during this time which is highly unusual here. In this case I was happy to NOT hear an XE, ha ha. ULR Sta #806-

1020, UNID SS Sta (Sounds like an XE), 1224 UTC, 9/15/11, there were TWO SS stations in here this morning. The strongest one was ID'd as XEOU, Huajuapan, Oaxaca (relog) identifying as "La Primera, XEOU." The other SS sta was mostly all tlk just like XEOU, so it was hard to tell who was saying what. I'm suspecting this might have been XEWO from Chetumal, Quintana Roo, but that remains to be solved another day. These were hrd in the null from semi-lcl KOKP, Perry, OK. I guess I can't depend on Richard to solve this one...KOKP is practically in his back yard! (or is that the front yard, Richard?)

After 1200 UTC, there were several signals present from what I presume to be Asia. A weak sig was hrd on 747 presumably from JOIB, Sapporo. Also a weak signal was hrd on 972 from maybe South Korea(?) The signal left the air right at 1230 UTC. A pretty healthy carrier was also noted on 999 kHz. The only sta I'm aware of that might be a possibility there would be KCBS from Pyongyang. I wish I could report some audio from these, but that wasn't the case...yet!

73 to everyone!!

Kirk Allen
Ponca City, OK


Re: ULR DX.....1 New Station @ Sunset Tonight............

Kirk
 

Howdy Rob,

What a touching tribute you just wrote about John. I'm saving your message for the radio archives here. Thank you for expressing what a lot of us feel about our old buddy, John. I'll always miss him but am also so thankful I knew him and actually listened to what he had to say about MANY different subjects.
Thanks again, Rob.

Kirk Allen
Ponca City, OK


ULR DX....One NEW STATION early this morning.......830 WFNO Norco, LOUISIANA

robert ross
 

Hi Guys:

One NEW STN for the ULR LOG last night......it is a RELOG (But Call Change) for the OVERALL LOG however. Had to stay with this for about 1/2 Hour and finally was able to match it up with the Live Web Feed. One very distinctive song with a Lot of Yelling/Yipping sealed the deal as the feed was a little behind the live reception. I heard the "La Raza" IDs but was under the impression these guys were still using the "La Fabulosa" Slogan.

RADIO USED........................SONY SRF-T615 Ultralight BAREFOOT
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

ULR LOG TOTALS are now..........942 Stations Heard
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

73...........ROB VA3SW

Robert S. Ross
London, Ontario CANADA

*******************************************************************************************
830 WFNO Norco, LOUISIANA Sept/15/11 0240 EDT SPANISH FAIR
Male DJ with Spanish Talk and Jingles @ 0240 Tune In. Spanish Ballads and Lively
Mexican Flavoured Music with LOTS of Accordions!! Every Song had Accordion as the
prominent instrument. Mixing with WCCO and mostly under WCCO and in the Null.
Man and Woman speaking Spanish with Jingles and "La Raza" ID. Matched up to Live Webfeed
with definite song match up and same Male DJ talking with La Raza IDs. Webpage now
shows the "La Raza" Slogan as well. Guess "La Fabulosa" is gone now......

RELOG but NEW CALLS for OVERALL LOG ULR # 942 5000/750 Watts Nights
ROSS, ONT.
*********************************************************************************************


Re: PL-606 and LW

Bill M <radioexray@...>
 

toptyp19 wrote:
Hi Bill-
I have a 660 and couldn't get into LW using the manual either. Peter
has it figured out though. Once you toggle LW on, turn on the receiver, and when you press 'AM' it goes to LW.
Joe
Aha! That last part is the missing step I was looking for. I had been trying to tune downwards.

Thanks!

-Bill


Re: WSM / 650 kHz Nashville TN from Canada / 1090 Miles

jerry_popiel
 

Thanks, for the interesting comments Bob. Actually over the last 2 days I have been reading Steve Ratzlaff's Testing data &   working on a new one of Gary's   "D"  Type 7.5" MW Loopstick wound with bigger 100/44 Litz Wire  instead of 40/44 Litz and it has really opened up the high end of the MW Band from the previous "G" LW Loopstick. And it still has some LW capability.  I'm in testing mode with it right now but as you mentioned this is Great Fun and a wonderful Hobby. 
 
Jerry 

From: Robert Ross
To: ultralightdx@...
Sent: Wednesday, September 14, 2011 7:38:00 PM
Subject: Re: [ultralightdx] WSM / 650 kHz Nashville TN from Canada / 1090 Miles

 

On 2011-09-14, at 8:28 PM, jerry_popiel wrote:

 
Guys, for the last 3 early mornings I have been able to receive Station WSM / 650 kHz Nashville, Tennessee USA at 10:00 UTC - a distance of 1754 Kilometers (1090 Miles) from Winnipeg, Canada. Most of the time I need to use the Longwave Coupler off my 80 ft longwave external antenna with my Tecsun PL 380 with Gary's External 7.5 "G" (1700 uh) LW Loopstick. But last night I was able to get WSM even with the "G" Loopstick alone which is optimized for Longwave Reception, S/N was up to 10 on the PL 380. So looks like that LW designed 7.5" Loopstick will still work for some good MW DX Reception.

Thanks
Jerry 


Yes Jerry...Gary's Longwave Ferrite's pick up all kinds of stuff on the BCB. Sometimes I pull out the LW PL-380 and DX on the BCB ....just for Fun to see what it will hear!! I swear it works almost as well as the BCB Ferrite PL-380!! Sure it may not be cut for "Optimum Reception" on BCB..but who cares...If you hear it...it's a Log!!! Whether it's S-9 or S-1.....makes no difference as long as you can ID it!!

Sometimes it's not so much "What" you are using to DX...it's just that you "Are There" when the Conditions are right with the Radio on..........

You can worry all day long if the Antenna you are using is "Optimum"....or you can turn the Radio on and Log something...which is exactly what you did with WSM!!

Keep having FUN with ULR's Jerry.......You just never know where the next Station you hear is gonna come from!!

73......ROB VA3SW

Robert S. Ross
London, Ontario CANADA




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