Date   

Re: Airband Listening

Max Italy
 

Hi, just a technical note, all the DSP portable radios use an external circuit to receive the air band, it is not received directly from the DSP IC (usually Si4735 in our radios)

The external circuit is a TA7358 receiver ic or similar (LA1185, KA22495, AN7205 or chinese versions).

This is a single chip receiver, PLL controlled in our case, with a MIX output, generally 10,7MHz.

The Si4735 is locked to receive 10.7MHz while the microprocessor controls the PLL for tuning. It's a downconversion of the band to IF

In any case i think that for the Air Band there is nothing better than a RTL dongle (SDR) because signals appear and disappear quickly and you can see them in a wide range of frequencies. With some autotuning software it is simple to receive the strongest signal on the band. 

To summarize i would say that with a SDR you receive simultaneusly all the frequencies in a band but activate the audio on one frequency. This is different from scanning in a circular way a group of frequencies. 


Portable Ultralight Radio Go Kit - May2020

Paul Blundell
 

Recently I have been looking at change / improving my Portable Ultralight Radio Go Kit. Until now I have used a few different cases and bags, some have worked really well, others have not been as great. What I enjoy is the challenge of trying different options, the experience I get from this allows me to continue improving my cases, hopefully finally finding the ultimate setup which works for me.

 

I was out doing some shopping recently when I called passed my local Bunnings store, here I found this new case for $30, I decided to replace my previous case as I found it was not working as well as I would have liked. My plan being to use my previous case for my work tools and use this new case for my Ultralight radio DXing kit.

 

I started off at home by sitting all my radios and other pieces of my DXing kit on the foam to see how they would all fit best. After this I cut the foam to suit and pulled out the required sections. Using this foam I decided that to fit in the most amount of radio gear, I would place my 3" FSL in sideways. To do this I had to remove all the foam from around this.

 

After getting my 3" FSL stored safely, I next moved on to cutting the required foam sections to store my radios, batteries, earphones, wire aerial and log sheets. This layout is about the most efficient use of the space that I could do.

 

Overall, I am very pleased with how well this case has come out, I am able to carry and store multiple radios, log sheets, pens, notes, spare batteries and ear phones, everything I need for portable sessions. It is also small enough to fit in my back pack. For $30 it provides a great level of protection. Using the foam means that each item has a home and that they are well protected, it is also much lighter than my previous cases, meaning I will carry it with me more often. It really wins on the price v size v quality scale.

 

While this case was designed for ultralight DXing the same ideas could be used for amateur radio, radio scanning or any other radio storage need.

 

Photos: https://ultralightradiodxing.blogspot.com/2020/05/portable-ultralight-radio-go-kit-may.html

--
Paul - Moderator
UltralightDX


Re: Software - MWDXerDB

Paul Blundell
 


On Mon, Mar 16, 2020 at 11:51 AM Paul Blundell via Groups.Io <tanger32au=gmail.com@groups.io> wrote:
A new video with some information on the updates is below.


https://ultralightradiodxing.blogspot.com/2020/01/software-mwdxerdb.html 

 

On Sun, Mar 15, 2020 at 8:23 PM Paul Blundell via Groups.Io <tanger32au=gmail.com@groups.io> wrote:
*** Update 15th March 2020 ***
Due to a total rewrite of MWDXerDB, please check here for any updates on this project. At this stage I am not offering any technical support of the current (pre March 2020) version.
https://ultralightradiodxing.blogspot.com/2020/01/software-mwdxerdb.html
--
Paul - Moderator
UltralightDX



--
Paul


--
Paul - Moderator
UltralightDX



--
Paul


--
Paul - Moderator
UltralightDX


Re: Airband Listening

Paul Blundell
 

Here in Australia we are still 25kHz, I believe that Europe is 8.33kHz spacing.


On Fri, 8 May 2020, 2:10 a.m. Rémy Friess, <rfriess@...> wrote:

Hi everyone,

I read somewhere that channel spacing on the Airband is being changed from 25 to 8 kHz.

Anyone know if this has been implemented anywhere already.

It's likely to be a problem as many receivers tune only in 25 kHz steps.

73, Rémy.




--
Paul - Moderator
UltralightDX


The past TP DX season.

Richard Allen <dx747j@...>
 

Today I came across a recording of a TP DX 10-17-19. My log book show it was an unidentified signal on 702 kHz. Before deleting it I decided to give a listen. It turned out there was enough partially readable audio to identify it as 2BL. So, although my TP season was lackluster, I was able to hear two DU stations. The other being 3LO on 9-20-19. Not bad for a simple setup of a Crane Skywave receiver with one of Gary’s FSL antennas. The season produced three new Japanese station here.

Recently I came across my old very modified Realistic 12-655 TRF receiver from the 1970’s. It was the receiver with which I heard my first TP (JOUB-774). So I decided to see if it still worked and sure enough it does. When I placed it near the 8-inch FSL stations came booming in. Too bad it doesn’t qualify as a ultralight.

Now looking forward to next season because it looks like we may be staying at home more than wanted.

Good DX,

Richard Allen,
near Perry OK USA.


Re: Airband Listening

Tom Crosbie G6PZZ <tom@...>
 

Rémy ,

IIRC it has already happened. There was talk of changing from 25 to 12.5 to double the number of channels but instead they went straight to 8.33kHz effectively tripling the number. The change to a long time to implement with both ground stations and aircraft. The scanners (particularly handhelds) available around the time could switch to 12.5 spacing and still pick up plenty of signals, courtesy of breakthrough due to the dreadful filtering they used to have. We did some tests when I worked for Lowe Electronics, we were right under a major air lane, Amber 1 I think.

 

Perhaps filtering has improved  in the day of the Ultralight. I don’t have one but even if I did, the skies are quite empty above me are noticeably empty.

 

HTH

 

73 Tom G6PZZ

 

From: main@UltralightDX.groups.io <main@UltralightDX.groups.io> On Behalf Of Rémy Friess
Sent: 07 May 2020 17:10
To: main@UltralightDX.groups.io
Subject: Re: [UltralightDX] Airband Listening

 

Hi everyone,

I read somewhere that channel spacing on the Airband is being changed from 25 to 8 kHz.

Anyone know if this has been implemented anywhere already.

It's likely to be a problem as many receivers tune only in 25 kHz steps.

73, Rémy.

 

 


Re: Airband Listening

Rémy Friess
 

Hi everyone,

I read somewhere that channel spacing on the Airband is being changed from 25 to 8 kHz.

Anyone know if this has been implemented anywhere already.

It's likely to be a problem as many receivers tune only in 25 kHz steps.

73, Rémy.




Re: Airband Listening

Dave613
 

Another good source for air band frequencies is https://skyvector.com/airports, the site also has aviation charts so you can see which airports are nearby your location, the most useful are probably the World VFR and larger scale sectionals. Agree the Skywave is good for air band reception, XHDATA D-808 seems to match it for reception of marginal signals IME, sound quality is better on D-808 (bigger speaker) but does not have any scanning function (unless is is hidden/undocumented).

Dave


Re: Airband Listening

James Fields <james.v.fields@...>
 

Great writeup.  The C. Crane Skywave SSB can actually "scan" up to 10 airband frequencies in a single bank.  After programming them into the bank you press both the up and down slewing buttons simultaneously to engage the scan.  I didn't see this mentioned elsewhere but if it was and I missed it, I apologize. It's not as fast as a purpose-built scanner but it's a nice feature.  Note it does not work with any of the other bands (LW/SW/MW/FM/WX) and other radios based on the same DSP chip set do not have this feature.


On Thu, May 7, 2020 at 1:10 AM Paul Blundell <tanger32au@...> wrote:
As some ultralight radios also cover the VHF Airband, I have published a guide on this.


http://ultralightradiodxing.blogspot.com/2020/05/airband-guide-to-airband-radio-listening.html
--
Paul - Moderator
UltralightDX



--
James V. Fields
james.v.fields@...


Re: Airband Listening

keith beesley
 

Thanks, gentlemen, good info. 

Keith Beesley
Seattle WA

On Wednesday, May 6, 2020, 10:47:07 PM PDT, kevin asato <kc6pob@...> wrote:


Good quick read, Paul.

Not quite ultralight as i have a desktop scanner programmed but -
Depending upon where you reside, the airbands can be tough to monitor. i am fortunate to have two commercial airports (LAX and LGB) and 3 municipal airports around me. I tend to scan the Unicom and Multicom frequencies where i mostly hear the local police (LAPD and LA Sheriff's helicopters), LA Fire, Coast Guard, and the local news helicopters (122.025, 122.050MHz) as well as small aircraft as they announce their positions and intentions under VFR rules. In addition i hear the warbirds flying in formation using the "Air CB" frequency of 123.45MHz. The airbands are a lot quieter nowadays with commercial air traffic at an all-time low. In addition to airbands, i have Marine channels 9, 13, 16, 21, 22 programmed in to monitor Los Angeles/Long Beach Port Operations and local Coast Guard activity. These frequencies are also a lot quieter given the current zombie apocalypse we are enduring.

i do have a handheld scanner that i drive around with also programmed for airband frequencies and have been screened through the terminal area with a Grundig G6 or scanner already tuned to air frequencies. in addition, i have yet to have problems carrying a radio with T/R or R/O capabilities in my frequent US travels. These are my experiences with the usual disclaimer - YMMV.

73,
kevin
kc6pob

On Wed, May 6, 2020 at 10:10 PM Paul Blundell <tanger32au@...> wrote:
As some ultralight radios also cover the VHF Airband, I have published a guide on this.


http://ultralightradiodxing.blogspot.com/2020/05/airband-guide-to-airband-radio-listening.html
--
Paul - Moderator
UltralightDX


Re: Airband Listening

kevin asato
 

Good quick read, Paul.

Not quite ultralight as i have a desktop scanner programmed but -
Depending upon where you reside, the airbands can be tough to monitor. i am fortunate to have two commercial airports (LAX and LGB) and 3 municipal airports around me. I tend to scan the Unicom and Multicom frequencies where i mostly hear the local police (LAPD and LA Sheriff's helicopters), LA Fire, Coast Guard, and the local news helicopters (122.025, 122.050MHz) as well as small aircraft as they announce their positions and intentions under VFR rules. In addition i hear the warbirds flying in formation using the "Air CB" frequency of 123.45MHz. The airbands are a lot quieter nowadays with commercial air traffic at an all-time low. In addition to airbands, i have Marine channels 9, 13, 16, 21, 22 programmed in to monitor Los Angeles/Long Beach Port Operations and local Coast Guard activity. These frequencies are also a lot quieter given the current zombie apocalypse we are enduring.

i do have a handheld scanner that i drive around with also programmed for airband frequencies and have been screened through the terminal area with a Grundig G6 or scanner already tuned to air frequencies. in addition, i have yet to have problems carrying a radio with T/R or R/O capabilities in my frequent US travels. These are my experiences with the usual disclaimer - YMMV.

73,
kevin
kc6pob

On Wed, May 6, 2020 at 10:10 PM Paul Blundell <tanger32au@...> wrote:
As some ultralight radios also cover the VHF Airband, I have published a guide on this.


http://ultralightradiodxing.blogspot.com/2020/05/airband-guide-to-airband-radio-listening.html
--
Paul - Moderator
UltralightDX


Re: Airband Listening

Gary DeBock
 

Hi Paul,

As part of the 2015 Ultralight Radio Shootout (which is posted at  https://swling.com/blog/2015/03/gary-debocks-2015-ultralight-radio-shootout-review/
I did a thorough investigation of the Air Band capabilities of the C.Crane Skywave, which was the first Ultralight radio to feature coverage of those frequencies. The excerpt below is from that article, including a link to air band frequencies in use throughout the USA, a recording of local air traffic (from Seattle-Tacoma International Airport) and a general description of airport communication:

Other Bands

The CC Skywave really excels on two other bands– one of which is unique in the Ultralight radio class. Its Weather Band sensitivity is far superior to that of the CC Pocket and DT-400W models, and it has the same Weather Alert function and selectable time periods (4, 8 or 16 hours) as those vertical-form models. Weather Band reception which is dicey on the smaller models is usually crystal clear on the Skywave—most likely because of the dedicated DSP chip for Weather and Air Band reception in the model.

If any reader places an extremely high priority on the stable reception of Weather Band alerts during emergencies, this is definitely the Ultralight radio of choice. Not only is the whip antenna far superior to the makeshift wire antenna system of the vertical-form models, but the DSP chip-provided sensitivity is in an entirely different league.

Finally, one of the obvious attractions of the CC Skywave model is its AIR Band coverage from 118-137 MHz—unique in the Ultralight radio class. According to information from C.Crane., the Si4736 DSP chip on the digital board is used strictly for Weather and AIR Band reception—and it definitely provides excellent sensitivity on both of those bands.

To get started in listening to communication between airports and airplanes the owner’s manual instructs the user to check the internet for airport frequency listings, specifically mentioning the http://www.flightradio.com site. After checking that site (and paying a $10 fee for “lifetime membership”) I was able to download a file with airport communication frequencies for the entire USA, which is posted here.

My home town of Puyallup, WA is along the direct southerly approach route for Seattle-Tacoma International Airport—a pretty busy site with lots of air traffic. The frequency listings mentioned a SeaTac tower frequency of 119.900 MHz, which is used by the tower to receive communication from airplanes approaching the airport and requesting a runway assignment. Depending upon air traffic, the time of day and luck, the CC Skywave can receive either a lot, a little or almost no communication on this tower frequency. Since only communication from airplanes is heard, the signal strengths can vary from a thunderous level (for planes directly overhead) down to a ghostly wisp (for airplanes many miles away).

Below, you’ll find a sample MP3 of the Skywave’s reception on this 119.900 MHz SeaTac tower frequency (with communication from three airplanes within two minutes). Click here to simply download this MP3.

Audio Player
 
 

The CC Skywave has a Squelch function which will mute the background noise on the AIR band frequencies while you await voice traffic—which is engaged by pushing in the tuning control for two seconds, then rotating the control to choose your desired threshold level. This is a nice feature for those who only wish to hear the voice communication, but it does reduce the radio’s reception sensitivity somewhat. In general the Skywave’s AIR Band coverage is a major plus for those interested in airport communication, although these types of transmissions are almost always brief, businesslike, and to the point. Listeners should not expect any of the emotion and drama typical in airport disaster movies!

Gary DeBock (in Puyallup, WA, USA)



Airband Listening

Paul Blundell
 

As some ultralight radios also cover the VHF Airband, I have published a guide on this.


http://ultralightradiodxing.blogspot.com/2020/05/airband-guide-to-airband-radio-listening.html
--
Paul - Moderator
UltralightDX


Ultralight Radio DXing Session - 6/05/2020

Paul Blundell
 

DATE: 06/05/2020
TIME: 21:35 – 22:05
LOCATION: Home, Launceston Tasmania.
RADIO / AERIAL: Digitech AR1733 / 3” FSL Aerial

 
FREQ
 
 
Station
SIGNAL
Pw
NOTES
558
kHz
 -
6WA
weak
50k
Logged @ 2769km
711
kHz
 -
4QW
good
10k
Logged @ 1501km
729
kHz
 -
5RN
good
50k
Logged @ 1042km
783
kHz
 -
8AL
poor
2k
Logged @ 2327km
792
kHz
 -
4RN
average
25k
Logged @ 1645km
891
kHz
 -
5AN
good
50k
Logged @ 1045km
909
kHz
 -
STAR
poor
 
Logged @ 2512km
1539
kHz
 -
5-HPON
average
5k
Logged @ 1045km
1548
kHz
 -
4QD
good
50k
Logged @ 1995km
--
Paul - Moderator
UltralightDX


Re: Saying Hello

Gary DeBock
 

I agree with you, Andy. This gentleman (?) has just been given the permanent boot.

The kicker was that he didn't want any email delivered from the group, which makes it pretty obvious that he doesn't care anything about Ultralight radio.

Gary DeBock (in Puyallup, WA, USA)


Re: Saying Hello

Andy ZL3AG
 

Yep. Someone just joined the VLF group, posted the exact same message, but from an entirely different name/email.

On 5/05/20 10:27 am, Andy ZL3AG via groups.io wrote:
My "this is a spammer warming up" alarm just went off.
On 5/05/20 7:32 am, trendingfindings@gmail.com wrote:
Hey everyone, new to the group.
Excited for this group's content.
Hope you are all staying safe


KJJR Whitefish, MT DX Test Time Line

Les Rayburn
 

00:-00:53 Opening Voice Announcement
00:53-01:48- Morse Code ID at 10 WPM 700 Hz
01:49-02:49- Sweep Tones
02:50-03:01- Telephone "Busy Signal"
03:02-03:35- Sweep Tones
03:36-04:36- "Laser Gun" Sweep Tones
04:37-05:29- Theme from Netflix Series "Stranger Things" Synthesizer Heavy
05:30-05:54- Telephone "Busy Signal"
05:54-08:01- Sweep Tones
08:02-08:13- Telephone "Busy Signal"
08:14-10:03- Morse Code ID at 10 WPM 700 Hz
10:05-11:03- COVID19 Patch--Original Synthesizer Composition (Mostly low tones. Whale song type sounds)
11:31-14:05- Sweep Tones
14:06-16:01- 1 Khz Continuous Tones in Since, Saw, Square, and Triangle waveforms. Similar to old Frequency Tests.
16:03-16:47- Test Continues Voice Announcement. Thanking Todd Clark and Paul Walker.
16:50-18:39- Morse Coide ID at 10 WPM 700 Hz
18:50-19:57- Stairstep Tone. Starts low and climbs rapidly in frequency.
19:59-21:34- Sliding Scale Tones. Step from 500 Hz to 3,000 Hz every few seconds.
21:35-21:59- Telephone "Busy Signal"
21:59-25:42- Sweep Tones
25:44-27:32- Morse Code ID at 10 WPM 700 Hz
27:33-33:55- Telephone Touch Pad and Video Game Sounds
33:55-34:27- British Police Siren
34:30-35:45- Stairstep Tone. Starts low and climbs rapidly in frequency.
35:48-37:42- 1 Khz Continuous Tones in Since, Saw, Square, and Triangle waveforms. Similar to old Frequency Tests.
37:43-41:33- "Frankenstein" by Edgar Winter Group. Synthesizer heavy.
41:35-42:20- Test Continues Voice Announcement. Thanking Todd Clark and Paul Walker.
42:22-44:11- Morse Code ID at 10 WPM 700 Hz.
44:12-45:47- Sweep Tones
45:48-46:10- Telephone "Busy Signal"
46:11-47:11- Sweep Tones
47:12-48:05- Theme from Netflix Series "Stranger Things." Synthesizer Heavy
48:06-49:31- COVID19 Patch--Original Synthesizer Composition (Mostly low tones. Whale song type sounds)
49:31-50:10- Stairstep Tone. Starts low and climbs rapidly in frequency.
50:11-52:00- Morse Code ID at 10 WPM 700 Hz
52:01-53:37- Sweep Tones.
53:38-55:33- 1 Khz Continuous Tones in Since, Saw, Square, and Triangle waveforms. Similar to old Frequency Tests.
55:33-55:45- Telephone "Busy Signal"
55:46-58:43- IRCA Theme Song. "Hands Across the Seas" Marching Band Music
58:44-59:37- Morse Code ID at 10 WPM 700 Hz
59:37-59:59- Closing Voice Announcement


County Comm GP-5SSB/PL-360 display whine

UAC
 

Hi all, 
Wonder if any other users have encountered this: display whine especially in MW thru audio when radio is held in hand. This is the freshly released black radio. I have one of the gray ones (both gen. III) and it is perfect. Tecsun dropped the ball on this one.
Anyone know of a fix? Anyone else had it happen with your units? 

Thanks, 
Rich


Ultralight Radio DXing Session - 04/05/2020

Paul Blundell
 

DATE: 04/05/2020
TIME: 21:30 – 22:15
LOCATION: Home, Launceston Tasmania.
RADIO / AERIAL: Digitech AR1733 / 3” FSL Aerial
NOTES: Last night I spent some time searching the band, my focus was on logging South Australia stations. 
In total I logged 19 stations, most were average or good signal levels. 5SY on 693kHz was a good log, as I was able to null out 3AW who share this frequency.
 
FREQ
 
 
Station
SIGNAL
639
kHz
 -
5CK
weak
693
kHz
 -
5SY
weak
729
kHz
 -
5RN
average
765
kHz
 -
5CC
average
801
kHz
 -
5RM
good
891
kHz
 -
5AN
good
963
kHz
 -
5SE
average
972
kHz
 -
5PB
good
1044
kHz
 -
5AU
average
1062
kHz
 -
5MV
average
1125
kHz
 -
5MU
average
1161
kHz
 -
5PA
poor
1197
kHz
 -
5RPH
good
1242
kHz
 -
5AU
good
1305
kHz
 -
5RN
weak
1323
kHz
 -
5DN
weak
1395
kHz
 -
5AA
good
1476
kHz
 -
5MG
weak
1539
kHz
 -
5-HPON
good
--
Paul - Moderator
UltralightDX


Re: Saying Hello

Mike Sanburn
 

Welcome!


From: main@UltralightDX.groups.io <main@UltralightDX.groups.io> on behalf of trendingfindings@... <trendingfindings@...>
Sent: Monday, May 4, 2020 12:32 PM
To: main@UltralightDX.groups.io <main@UltralightDX.groups.io>
Subject: [UltralightDX] Saying Hello
 

Hey everyone, new to the group.
Excited for this group's content.
Hope you are all staying safe

2461 - 2480 of 31891