Date   

Re: Selectivity, sensitivity, quality

Issac Quincey
 

This explains it very well. I have shown it to a ham friend of mine and he thinks it is spot on.

Sent with ProtonMail Secure Email.

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

On Monday, March 7th, 2022 at 10:46 PM, Robert Conboy <robconboy@...> wrote:

Selectivity is a combination of the channel selection filter’s bandwidth and how steeply the filter attenuates frequencies outside the filter’s bandwidth.

Narrow filters have greater selectivity, but they’re also narrower than the bandwidth broadcast by the station. When this is the case, the audio’s treble is lost. If the radio is capable of it, then detuning the radio slightly can restore some of the treble. Also, if there is a strong station on an adjacent frequency, choosing a narrow filter setting and detuning a little, in the direction away from the strong adjacent, helps reject the adjacent channel interference.

The reason why it is often impossible to completely reject adjacent channel interference is because the sidebands broadcast by the adjacent station overlap the sidebands broadcast by the station you’re tuned to. There will be splashover no matter how good your radio is

But

It is often possible to completely or almost completely eliminate this kind of interference by using a directional antenna. Loop antennas have two sharp nulls 180 degrees apart. If you can point one of the nulls toward the offending station, its interference can be reduced or eliminated.

Sensitivity is about how weak a signal the radio can receive. Theoretically, the only thing necessary is to have the received signal be stronger than the noise generated internally in the radio. Usually atmospheric noise coming in from the antenna is much higher than this, so increasing the gain does little to help beyond a certain point. Therefore sensitivity is more about signal to noise ratio than it is about how much the radio amplifies. The way to get better sensitivity is by placing the antenna away from sources of noise, and by using an antenna with directional characteristics. If atmospheric noise is coming from all directions, an antenna that is sensitive only to signals coming from one direction will reject much of it. In fact, such an antenna usually has very low signal amplitude, but the noise is even lower, making sensitivity better.


Re: All Continental US States - 2022

Issac Quincey
 

We could try the same in each country? Each person tries to log as many areas as they can.

Sent with ProtonMail Secure Email.

------- Original Message -------
On Wednesday, March 9th, 2022 at 10:08 AM, Michael.2E0IHW via groups.io <blumu@...> wrote:

I am in Devon and bewail the loss of MW broadcasts. Only Spain is holding the fort now,
apart from a few UK and European stations. We should long since have realised
how valuable MW is for public information in a crisis. I can no longer receive local
news since Auntie shut down the only transmitter which can reach parts that others
cannot reach - coasts and valleys. Internationally, SW can be even more useful,
but few have access - or even know it exists!

The BBC is struggling to revive facilities to broadcast into eastern Europe now.
Our recent storms should have enlightened us that the mobile phone network
we take for granted is very vulnerable.
We should learn from history, but...

In the US broadcast band is still going strong. May it remain so!

Michael

On 08/03/2022 22:14, FenDrifter via groups.io wrote:

Hi Steve
Yes, you’re right about my location, east of Peterborough. I’m new to this game and until now have mainly been listening to the hams on side band. I’ve become aware that the majority of members of this group are MW listeners, and again with the majority Stateside I’ve felt a little isolated, but the link you supplied will certainly encourage me to spend a bit more time on the medium wave band. I hasten to add here that this group has been nothing other than welcoming and helpful. Regarding propagation conditions, I’ve not been at it long enough to know if I’ve ever experienced good conditions 🤔. I am of course aware that some days are a lot better than others!

Cheers




Re: ULDXIndex and MWDXerDB V22.03

Issac Quincey
 

Is that what you have coded this with? Would you think about my offer to review the code for security holes and bugs?

Sent with ProtonMail Secure Email.

------- Original Message -------
On Wednesday, March 9th, 2022 at 8:17 AM, Paul Blundell <tanger32au@...> wrote:

Yeah, JustBasic handles that :)

On Wed, 9 Mar 2022, 12:52 am FenDrifter via groups.io, <essexmarshman=icloud.com@groups.io> wrote:
BODMAS Paul?



Re: All Continental US States - 2022

Steve Whitt
 

Hi

I’m not sure if you are still looking for your first trans-atlantic signals. From the Uk I’d suggest looking at 590kHz around 10pm onwards to try for VOCM from Newfoundland. At UK sunrise look for WBBR 1130 for New York.

 

Good luck

Steve

 

From: main@UltralightDX.groups.io [mailto:main@UltralightDX.groups.io] On Behalf Of FenDrifter via groups.io
Sent: 08 March 2022 22:15
To: main@UltralightDX.groups.io
Subject: Re: [UltralightDX] All Continental US States - 2022

 

Hi Steve
Yes, you’re right about my location, east of Peterborough. I’m new to this game and until now have mainly been listening to the hams on side band. I’ve become aware that the majority of members of this group are MW listeners, and again with the majority Stateside I’ve felt a little isolated, but the link you supplied will certainly encourage me to spend a bit more time on the medium wave band. I hasten to add here that this group has been nothing other than welcoming and helpful. Regarding propagation conditions, I’ve not been at it long enough to know if I’ve ever experienced good conditions 🤔. I am of course aware that some days are a lot better than others! 

Cheers
Drifter


Re: 864 kHz

Mark
 

Thanks Russ, 

Useful link. 


Re: 864 kHz

Russ Edmunds
 

That is indeed Eqypt.

You might want to check out mwlist:   https://www.mwlist.org/mwlist_quick_and_easy.php

Russ Edmunds

WB2BJH

Blue Bell, PA

Grid FN20id


From: main@UltralightDX.groups.io <main@UltralightDX.groups.io> on behalf of Mark via groups.io <metagenetics@...>
Sent: Tuesday, March 8, 2022 6:13 PM
To: main@UltralightDX.groups.io <main@UltralightDX.groups.io>
Subject: [UltralightDX] 864 kHz
 
Hi all, 

Can anyone confirm if 'Al Qaran' on 864 kHz does in fact broadcast out of Egypt? I pick this station up night after night, from the east coast of Scotland very clearly with my small loop antenna. A quick check on Google maps reveals that distance to be over 2600 miles!

Cheers, Mark. 


864 kHz

Mark
 

Hi all, 

Can anyone confirm if 'Al Qaran' on 864 kHz does in fact broadcast out of Egypt? I pick this station up night after night, from the east coast of Scotland very clearly with my small loop antenna. A quick check on Google maps reveals that distance to be over 2600 miles!

Cheers, Mark. 


Re: All Continental US States - 2022

Michael.2E0IHW
 

I am in Devon and bewail the loss of MW broadcasts. Only Spain is holding the fort now,
apart from a few UK and European stations. We should long since have realised
how valuable MW is for public information  in a crisis. I can no longer receive local
news since Auntie shut down the only transmitter which can reach parts that others
cannot reach - coasts and valleys.  Internationally, SW can be even more  useful,
but few have access - or even know it exists!

The BBC is struggling to revive facilities to broadcast into eastern Europe now.
Our recent storms should have enlightened us that the mobile phone network
we take for granted is very vulnerable. 
We should learn from history, but...

In the US broadcast band is still going strong. May it remain so!

Michael

On 08/03/2022 22:14, FenDrifter via groups.io wrote:

Hi Steve
Yes, you’re right about my location, east of Peterborough. I’m new to this game and until now have mainly been listening to the hams on side band. I’ve become aware that the majority of members of this group are MW listeners, and again with the majority Stateside I’ve felt a little isolated, but the link you supplied will certainly encourage me to spend a bit more time on the medium wave band. I hasten to add here that this group has been nothing other than welcoming and helpful. Regarding propagation conditions, I’ve not been at it long enough to know if I’ve ever experienced good conditions 🤔. I am of course aware that some days are a lot better than others! 

Cheers



Re: All Continental US States - 2022

FenDrifter
 

Hi Steve
Yes, you’re right about my location, east of Peterborough. I’m new to this game and until now have mainly been listening to the hams on side band. I’ve become aware that the majority of members of this group are MW listeners, and again with the majority Stateside I’ve felt a little isolated, but the link you supplied will certainly encourage me to spend a bit more time on the medium wave band. I hasten to add here that this group has been nothing other than welcoming and helpful. Regarding propagation conditions, I’ve not been at it long enough to know if I’ve ever experienced good conditions 🤔. I am of course aware that some days are a lot better than others! 

Cheers
Drifter


Re: All Continental US States - 2022

Steve Whitt
 

Hi Fen Drifter

 

Glad you found it useful. It does need a bit of updating which I hope will happen soon.

 

Yes I’m in the UK. If your handle indicates where you located I’m only about 100 miles north of you (near York).

 

This year listeners in the UK have had real difficulty hearing anything from the western half of the USA. Sadly, propagation conditions have largely not been favourable.

 

Regards

Steve

 

 

From: main@UltralightDX.groups.io [mailto:main@UltralightDX.groups.io] On Behalf Of FenDrifter via groups.io
Sent: 08 March 2022 13:48
To: main@UltralightDX.groups.io
Subject: Re: [UltralightDX] All Continental US States - 2022

 

Hi Steve
Wow, I was totally unaware that such a list existed! Now that I have something to search for I may change my listening habits a bit 😊. Very many thanks for that
Drifter
p.s. Are you in the UK?


Re: ULDXIndex and MWDXerDB V22.03

Paul Blundell
 

Yeah, JustBasic handles that :)


On Wed, 9 Mar 2022, 12:52 am FenDrifter via groups.io, <essexmarshman=icloud.com@groups.io> wrote:
BODMAS Paul?


Re: ULDXIndex and MWDXerDB V22.03

Paul Blundell
 

Yes, that is the formula I use. 

I did also look at using two numbers but this got a bit confusing so I just give each signal a single index score.

On Wed, 9 Mar 2022, 12:46 am James Rohrer, <Jim.rohrer1955@...> wrote:
Paul,

Do you compute like this? Dividing before multiplying.

ULDXIndexValue = (DistanceKM / PowerW) * SignalLevel

Regarding signal level, I guess '5by5' could be guideline.  If the signal is both strong and clear, then give it a 5. 


Re: ULDXIndex and MWDXerDB V22.03

FenDrifter
 

BODMAS Paul?


Re: All Continental US States - 2022

FenDrifter
 

Hi Steve
Wow, I was totally unaware that such a list existed! Now that I have something to search for I may change my listening habits a bit 😊. Very many thanks for that
Drifter
p.s. Are you in the UK?


Re: ULDXIndex and MWDXerDB V22.03

James Rohrer
 

Paul,

Do you compute like this? Dividing before multiplying.

ULDXIndexValue = (DistanceKM / PowerW) * SignalLevel

Regarding signal level, I guess '5by5' could be guideline.  If the signal is both strong and clear, then give it a 5. 


Re: All Continental US States - 2022

Steve Whitt
 

Hi Johnny

The list is only relevant for one  particular location. Your local stations may block reception of distant States.

 

Outside the US it is a different problem all together – but still almost achievable.

 

Here for example is the target list from the UK.

 

https://mwcircle.org/catch-all-north-america-by-andrew-brade/

 

 

Regards

Steve

 

 

 

From: main@UltralightDX.groups.io [mailto:main@UltralightDX.groups.io] On Behalf Of keith beesley via groups.io
Sent: 08 March 2022 01:46
To: main@UltralightDX.groups.io
Subject: Re: [UltralightDX] All Continental US States - 2022

 

 

Johnny, 

 

Here's an OLD post (January 29, 1992!) from a Google group about hearing 50 states on AM/MW. Note that many of these stations have since changed call-signs, but I believe most of them are still around as of March, 2022: 

 

Douglas W. Martin's profile photo

Douglas W. Martin

Jan 29, 1992, 8:46:08 AM

to

For those interested in dx on the AM broadcast band, here are my
picks for logging all 50 states. In most cases, these are the most powerful
stations in each state, or they are on frequencies with the least
number of competing stations. In a few cases, e.g. South Carolina, the best bet
is not powerful or clear channel. Rather, it has the best night-time
antenna pattern.
For New Hampshire, WFEA-1370 is the only station from that state that
can be heard in the midwest. I don't know why.
Basically, listed stations that are not 50 kw or clear channels are based on
my dx experience all over the country. For whatever reason,
these are the stations that get out best.
I have tried to list more than one station, in case someone has a local station
on the frequency of the best catch.
In many cases, I have notes about Hawaii or the east coast, just to verify
that the given station really gets out. Sorry if some call letters are old;
I did this list from memory.
Hope this helps.
(If anyone has easier stations to log, please let me know.)

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

Alabama: WERC-960, WHHY-1170
Alaska: KYAK-650, KFQD-750, KBBI-890
(KBBI is the only one that can be heard in Southern Cal)
Arizona: KTNN-660, KNIX-1580
Arkansas: KAAY-1090
California: KFI-640, KNX-1070, KFBK-1530
(All these I have heard from the east coast and from Hawaii.)
Colorado: KOA-850
Connecticut: WTIC-1080
Delaware: WDEL-1150
Florida: WGBS-710, WSRF-1580, WSUN-620
Georgia: WSB-750 (heard in Hawaii)
Hawaii: KIKI-830, KAIM-870,
IOWA: WHO-1040, KXEL-1540
Idaho: KBOI-670
Illinois: WMAQ-670, WGN-720, WBBM-780, WLS-890
(All heard both from the east coast and from Hawaii.)
Indiana: WOWO-1190, WIBC-1070
Kansas: KFDI-1070, KFH-1330, WIBW-580
Kentucky: WHAS-840 (heard in Hawaii.)
Louisiana: WWL-870, KWKH-1130
(both heard from the east coast and from Hawaii.)
Maine: Auburn--1530
Maryland: WBAL-1090
Massachusetts: WBZ-1030 (heard from Hawaii.)
Michigan: WJR-760
Minnisota: WCCO-830
Mississippi: 810 kHz, or WOKJ-1550, or WCPC-940
Missouri: KMOX-1120
Montana: KOFI-1180, KJJR-880
Nebraska: KRVN-880, WOW-590, KFAB-1110
Nevada: KDWN-720, KROW-780, KVEG-840
New Hampshire: WFEA-1370 (logged from Ohio.)
New Jersey: WPAT-930 NEWARK-620
New Mexico: KOB-770
New York: WHAM-1180, NYC-clear--660 770 880
North Carolina: WBT-1110, WPTF-680
North Dakota: KFYR-550, KFNW-1200, KQWB-1550 (all logged from Hawaii)
Ohio: WLW-700, WWWE-1100 (logged from Hawaii)
Oklahoma: KOMA-1520, KRMG-740, KGYN-1210, KVOO-1170
Oregon: KEX-1190, KPNW-1120
Pennsylvania: KDKA-1020, WCAU-1210 (logged from Hawaii)
Rhode Island: WJAR-920 (heard in Ohio)
South Carolina: WFBC-1330
South Dakota: WNAX-570, KBHB-810 (Logged from Hawaii)
Tennessee: WSM-650, Memphis-1030
Texas: WOAI-1200, WBAP-820
Utah: KSL-1160, KFAM-700, KOAL-750
Vermont: WDEV-550, WVMT-620
Virginia: WRVA-1140
Washington DC: WTOP-1500, WRC-980
Washington: KIRO-710, KGA-1510
West Virginia: WWVA-1170
Wisconsin: WISN-1070, WTMJ-620
Wyoming: KTWO-1030

Keith Beesley

Seattle WA USA

On Monday, March 7, 2022, 01:02:43 PM PST, Paul Blundell <tanger32au@...> wrote:

 

 

Well done. 

 

I have been a bit slow with starting my DXing for 2022, my work on MWDXerDB has taken up most of my spare time.

 

On Tue, 8 Mar 2022, 1:02 am Johnny via groups.io, <jlochey=yahoo.com@groups.io> wrote:

Hi Paul,

Was cruising along quite quickly at first...
24 States!

But now it has gotten more difficult as the states are further and further away....


J


Re: ULDXIndex and MWDXerDB V22.03

Paul Blundell
 

I don't use the signal meter, it is more a mix of signal level, audio quality and how "clean" the signal is.


On Tue, Mar 8, 2022 at 12:45 PM James Rohrer <Jim.rohrer1955@...> wrote:
Now I understand the importance of taking Station power into account and not just distance.  tonight I heard I in 1630 Iowa City.  Only 200 miles away but not heard before.  10,000 watts.  My radio does not display signal power so I cannot compute the index .  I need another radio. 

Focusing just on AM sensitivity, not SW, which UL is best value?  Needs to display signal strength.






--
Paul


Re: All Continental US States - 2022

keith beesley
 


Johnny, 

Here's an OLD post (January 29, 1992!) from a Google group about hearing 50 states on AM/MW. Note that many of these stations have since changed call-signs, but I believe most of them are still around as of March, 2022: 

Douglas W. Martin's profile photo

Douglas W. Martin

Jan 29, 1992, 8:46:08 AM
to

For those interested in dx on the AM broadcast band, here are my
picks for logging all 50 states. In most cases, these are the most powerful
stations in each state, or they are on frequencies with the least
number of competing stations. In a few cases, e.g. South Carolina, the best bet
is not powerful or clear channel. Rather, it has the best night-time
antenna pattern.
For New Hampshire, WFEA-1370 is the only station from that state that
can be heard in the midwest. I don't know why.
Basically, listed stations that are not 50 kw or clear channels are based on
my dx experience all over the country. For whatever reason,
these are the stations that get out best.
I have tried to list more than one station, in case someone has a local station
on the frequency of the best catch.
In many cases, I have notes about Hawaii or the east coast, just to verify
that the given station really gets out. Sorry if some call letters are old;
I did this list from memory.
Hope this helps.
(If anyone has easier stations to log, please let me know.)

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

Alabama: WERC-960, WHHY-1170
Alaska: KYAK-650, KFQD-750, KBBI-890
(KBBI is the only one that can be heard in Southern Cal)
Arizona: KTNN-660, KNIX-1580
Arkansas: KAAY-1090
California: KFI-640, KNX-1070, KFBK-1530
(All these I have heard from the east coast and from Hawaii.)
Colorado: KOA-850
Connecticut: WTIC-1080
Delaware: WDEL-1150
Florida: WGBS-710, WSRF-1580, WSUN-620
Georgia: WSB-750 (heard in Hawaii)
Hawaii: KIKI-830, KAIM-870,
IOWA: WHO-1040, KXEL-1540
Idaho: KBOI-670
Illinois: WMAQ-670, WGN-720, WBBM-780, WLS-890
(All heard both from the east coast and from Hawaii.)
Indiana: WOWO-1190, WIBC-1070
Kansas: KFDI-1070, KFH-1330, WIBW-580
Kentucky: WHAS-840 (heard in Hawaii.)
Louisiana: WWL-870, KWKH-1130
(both heard from the east coast and from Hawaii.)
Maine: Auburn--1530
Maryland: WBAL-1090
Massachusetts: WBZ-1030 (heard from Hawaii.)
Michigan: WJR-760
Minnisota: WCCO-830
Mississippi: 810 kHz, or WOKJ-1550, or WCPC-940
Missouri: KMOX-1120
Montana: KOFI-1180, KJJR-880
Nebraska: KRVN-880, WOW-590, KFAB-1110
Nevada: KDWN-720, KROW-780, KVEG-840
New Hampshire: WFEA-1370 (logged from Ohio.)
New Jersey: WPAT-930 NEWARK-620
New Mexico: KOB-770
New York: WHAM-1180, NYC-clear--660 770 880
North Carolina: WBT-1110, WPTF-680
North Dakota: KFYR-550, KFNW-1200, KQWB-1550 (all logged from Hawaii)
Ohio: WLW-700, WWWE-1100 (logged from Hawaii)
Oklahoma: KOMA-1520, KRMG-740, KGYN-1210, KVOO-1170
Oregon: KEX-1190, KPNW-1120
Pennsylvania: KDKA-1020, WCAU-1210 (logged from Hawaii)
Rhode Island: WJAR-920 (heard in Ohio)
South Carolina: WFBC-1330
South Dakota: WNAX-570, KBHB-810 (Logged from Hawaii)
Tennessee: WSM-650, Memphis-1030
Texas: WOAI-1200, WBAP-820
Utah: KSL-1160, KFAM-700, KOAL-750
Vermont: WDEV-550, WVMT-620
Virginia: WRVA-1140
Washington DC: WTOP-1500, WRC-980
Washington: KIRO-710, KGA-1510
West Virginia: WWVA-1170
Wisconsin: WISN-1070, WTMJ-620
Wyoming: KTWO-1030

Keith Beesley
Seattle WA USA

On Monday, March 7, 2022, 01:02:43 PM PST, Paul Blundell <tanger32au@...> wrote:


Well done. 

I have been a bit slow with starting my DXing for 2022, my work on MWDXerDB has taken up most of my spare time.

On Tue, 8 Mar 2022, 1:02 am Johnny via groups.io, <jlochey=yahoo.com@groups.io> wrote:
Hi Paul,

Was cruising along quite quickly at first...
24 States!

But now it has gotten more difficult as the states are further and further away....


J


Re: ULDXIndex and MWDXerDB V22.03

James Rohrer
 

Now I understand the importance of taking Station power into account and not just distance. tonight I heard I in 1630 Iowa City. Only 200 miles away but not heard before. 10,000 watts. My radio does not display signal power so I cannot compute the index . I need another radio.

Focusing just on AM sensitivity, not SW, which UL is best value? Needs to display signal strength.


Re: Headphones

Paul Blundell
 

Yeah, a bit big for my use but it sounds like they work really well for you.

Paul

On Tue, Mar 8, 2022 at 9:00 AM DX Central - Loyd Van Horn (W4LVH) <w4lvhsc@...> wrote:
These might be a bit bulky for UL use, but there are simply no finer DX headphones than these.  They are the standard for every radio station I ever worked at, for video production, etc.  I got my pair in 2000 when I first started in radio during college and I use them to this day.  Have logged thousands of AM and FM stations with them, thousands of QSOs on ham radio, recorded three albums of my music with them…..and I have even taken them on the road while DXing portable.   If they bit the farm tomorrow, I’d buy another pair the same day.   

Apparently quite popular with many radio engineers as well.  


From: main@UltralightDX.groups.io <main@UltralightDX.groups.io> on behalf of James Rohrer <Jim.rohrer1955@...>
Sent: Monday, March 7, 2022 8:37:23 AM
To: main@ultralightdx.groups.io <main@ultralightdx.groups.io>
Subject: [UltralightDX] Headphones
 
My small JVC headset amplifies the sound and eliminates ambient noise.  Only one ear, of course. Earplugs are not as good.  What are other options?

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

73 and best of DX,

Loyd Van Horn
W4LVH - Mandeville, LA
Member:  IRCA/NRC Courtesy Program Committee (CPC)
Founder: DX Central - Because we're all about radio
Twitter:  @DXCentral



--
Paul

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