eHam

eHam Forums => SWL (Shortwave Listening) => Topic started by: KE2KB on June 13, 2019, 05:58:10 PM



Title: Who is on 10.0 to 10.1 MHz?
Post by: KE2KB on June 13, 2019, 05:58:10 PM
Hello;
I just tuned to 10.000MHz and heard the WWV time signal. Then I started tuning up the dial, and found phone activity that sounds like Chinese at 10.008.80 MHz.
Since this is below the 30 meter ham band, and there is no phone on 30m, I assume they're not hams...
The signal does not appear to have much (if any) QSB on it, so I am assuming it's local.
My QTH is northern NJ, about 6 miles west of Manhattan.

The date is 2019-06-14
The time is: 0050 Z

any ideas?

Frank <KE2KB>


Title: RE: Who is on 10.0 to 10.1 MHz?
Post by: WW7KE on June 13, 2019, 09:19:23 PM
10.005 to 10.100 MHz is an aviation band, mostly used for voice communications on international flights.  Aircraft communications are also on 15.01-15.10 MHz and 20.01-21.00 MHz bands, right above WWV, among other frequencies.

https://www.smeter.net/spectrum/aviation.php


Title: RE: Who is on 10.0 to 10.1 MHz?
Post by: KE2KB on June 14, 2019, 05:37:58 AM
Thanks.
Later, after I posted here, I found what sounded like ATIS a bit higher in the 10MHz band.
The Chinese I was hearing didn't sound like aviation talk - more like idle chatter, but maybe it only sounded like that because I didn't understand the language. Then again, I thought all aviation comm was supposed to be English...


Title: RE: Who is on 10.0 to 10.1 MHz?
Post by: N8YX on June 14, 2019, 07:08:49 AM
Thanks.
Later, after I posted here, I found what sounded like ATIS a bit higher in the 10MHz band.
The Chinese I was hearing didn't sound like aviation talk - more like idle chatter, but maybe it only sounded like that because I didn't understand the language. Then again, I thought all aviation comm was supposed to be English...
10.051USB has a decent amount of ATIS traffic.


Title: RE: Who is on 10.0 to 10.1 MHz?
Post by: KE2KB on June 14, 2019, 08:49:45 AM
This is interesting. I always thought all air traffic comm was on VHF @ about 115-140MHz AM.


Title: RE: Who is on 10.0 to 10.1 MHz?
Post by: VA3VF on June 14, 2019, 09:00:47 AM
This is interesting. I always thought all air traffic comm was on VHF @ about 115-140MHz AM.
Both voice and data are still used on HF. Check HFDL for air traffic data.


Title: RE: Who is on 10.0 to 10.1 MHz?
Post by: KE2KB on June 14, 2019, 10:02:34 AM
I guess I could use PC HFDL with either my Yaesu FT-450D or the SDRPlay (using VB Cable). I might try it, if it's not too much trouble to set up.


Title: RE: Who is on 10.0 to 10.1 MHz?
Post by: VA3VF on June 14, 2019, 10:07:09 AM
Yes, PC-HFDL with RSP1A and VB cable worked great for me.


Title: RE: Who is on 10.0 to 10.1 MHz?
Post by: NO2A on June 14, 2019, 11:51:06 AM
This is interesting. I always thought all air traffic comm was on VHF @ about 115-140MHz AM.
I read that aircraft moved to higher frequencies.


Title: RE: Who is on 10.0 to 10.1 MHz?
Post by: VA3VF on June 14, 2019, 01:38:53 PM
This is interesting. I always thought all air traffic comm was on VHF @ about 115-140MHz AM.
I read that aircraft moved to higher frequencies.
Aren't you referring to the new satellite based ADS-B system by Aireon? It has not replaced anything, not yet.


Title: RE: Who is on 10.0 to 10.1 MHz?
Post by: KA3JJZ on June 15, 2019, 07:21:29 PM
I guess I could use PC HFDL with either my Yaesu FT-450D or the SDRPlay (using VB Cable). I might try it, if it's not too much trouble to set up.

You can get the most recent system table of frequencies, along with a file you can use in the registered version of PC-HFDL at the following link. The file is a zip file and is called 'HFDL system table 51 for PC-HFDL + text file'. The URL is:

http://www.udxf.nl/modes.html

A new site in South Korea just opened up recently, and this table reflects that, but from what I've been told, not all stations are on board with the new table yet. Still this ought to let you know where to tune to hear HFDL

There are a few other packages that can copy HFDL such as Sorcerer, MultiPSK and Sigmira. The links for these, along with PC-HFDL, can be found here

https://wiki.radioreference.com/index.php/HF_Software_Decoders

Mike
.



Title: RE: Who is on 10.0 to 10.1 MHz?
Post by: KA2ODP on June 26, 2019, 11:46:05 AM
"This is interesting. I always thought all air traffic comm was on VHF @ about 115-140MHz AM."

Most domestic civilian aviation ATC traffic is 118-137 MHz.  Aeronautical navigation aids operate at 108-118 MHz.  But if you are flying across the Atlantic or the Pacific ocean, you will find yourself beyond VHF communications range.  This is where the HF frequencies come in to play.  HF is the only way to maintain radio contact with a land station when you are in the middle of no where somewhere over an ocean. Google "HF ATC frequencies" and you will find lots of information on how aircraft keep in touch when flying over an ocean.  It can be interesting to listen to.


Title: RE: Who is on 10.0 to 10.1 MHz?
Post by: SM0AOM on June 29, 2019, 12:20:04 AM
Currently, there are 31 3 kHz USB channels in the 10005 to 10100 kHz range which are coordinated both regionally and world-wide for Aeronautical Mobile (R) services.

The channeling plan and sharing criteria is described in Appendix 27Aer of the ITU Radio Regulations.

"27/217 4 The world-wide frequency allotments appearing in the Tables at No. 27/213 and
Nos. 27/218 to 27/231, except for carrier (reference) frequencies 3 023 kHz and 5 680 kHz, are
reserved for assignment by administrations to stations operating under authority granted by the
administration concerned, for the purpose of serving one or more aircraft operating agencies. Such
assignments are to provide communications between an appropriate aeronautical station and an
aircraft station anywhere in the world for exercising control over regularity of flight and for safety of
aircraft. World-wide frequencies are not to be assigned by administrations for MWARA, RDARA
and VOLMET purposes. Where the operational area of an aircraft lies wholly within a RDARA or
Sub-RDARA boundary, frequencies allotted to those RDARAs and Sub-RDARAs shall be used"


The number of stations using this range have been quite small, in Europe only our former competitor Berna Radio used 10069 kHz.