Possible 30.170 AM broadcast harmonic reception this PM

[wv2vvl]

30.170 AM S9+20 dB w/QSB English DJ with songs, music not R&R, probably religious. Nothing on 15.085 (Iran) but WWV 15.00 S2. 0707 UTC. Gone at 0900 UTC. Missed catching station C/s, ID. Nothing on FCC but this DJ sounded American.

Ant: Kreco sleeve coaxial 29.60 @ 620' AMSL
Rx: Yaesu FTdx-10

73

Jack
W2INF

 

[TAC4]

I think your VHF Lo Antenna is more interesting than your log. wink
Anyway the highest frequency log on the Shortwave info site is
WORLD MUSIC RADIO Marslet, Denmark 25800 Khz 24/7 station
at 200 watts in Danish. I bet it is just a harmonic or intermod. What height do you have that antenna at again ?

 

[ka3jjz]

More likely a spur or a mixing product from something. That frequency is not allocated for the broadcast service.

Mike

 

[wv2vvl]

More likely a spur or a mixing product from something. That frequency is not allocated for the broadcast service.

Mike

As I posted, this was a harmonic. It was too clean to be a mixing product. I checked its apparent fundamental, 15.085, but found nothing there even though I picked up WWV on 15.000.

 

[wv2vvl]

As I posted, this was a harmonic. It was too clean to be a mixing product. I checked its apparent fundamental, 15.085, but found nothing there even though I picked up WWV on 15.000.

30.170 0543 UTC Faint American male talk, brief music. Up to S6+ w/QSB. Kreco sleeve coaxial 29.60 @ 620' AMSL Yaesu FTdx-10.

Nothing on 15.085 but trace of signal on spectrum display. ICOM R8600/Diamond Superdiscone @ 610' AMSL. Nothing on gear above.

WWV 15.000 to S3+

73

Jack
W2INF

 

[ka3jjz]

If it wasn't found on 15085 it's not likely to be a harmonic. It should be divisible and land on a BC frequency if that was the case. More likely a spur from a transmitter somewhere. If you hear it again, it would be interesting to find out who it is.

Mike

 

[wv2vvl]

30.170 AM Monday 6/24/24 0335 UTC S7 > S9+10 w/QSB. American male voice, music. Mention of meeting, speakers, prayer, immigrants. Off air 0900 UTC. Active only at night, which points to 6.034 MHz ( 30.170/5). in 49m band, which is active mainly at night when best propagation & most SW listeners are at home. I'm not getting into politics on this one but it points to being recently activated by a conservative group. ICOM 7300/EFLW/41' sloper set for 6.034 AM.

73

Jack
W2INF

 

[ka3jjz]

That's a good one - a 5th harmonic of a 49 mb station. Now identify the station and write a report. I'll bet you will get an interesting answer

Mike

 

[wv2vvl]

That's a good one - a 5th harmonic of a 49 mb station. Now identify the station and write a report. I'll bet you will get an interesting answer

Mike

AM BC stations are notorious for generating harmonics. Of all the numeric possibilities, this freq is the only one that occurs in a regulation SW band.

I have one radio on the proposed carrier freq & the other on 30.17. So we will see.

73

Jack

 

[wv2vvl]

That's a good one - a 5th harmonic of a 49 mb station. Now identify the station and write a report. I'll bet you will get an interesting answer

Mike

See: What are harmonics? I'm checking whether 30.17 is the 5th harmonic of 6.034 MHz. This is a valid shortwave BC frequency in the 49 METER band, not 49 mb. I'm monitoring both frequencies. AM BC stations often emit harmonics as having a 'clean' transmitter is not a priority.

The bad news is that our Radio Marti Sp-language propaganda transmitter went on the air 6.030 @ 1202 UTC S9+12 dB, so having to listen to 6.034 means having to listen to a lot of their near-channel splatter.

 

[ka3jjz]

That statement about AM BC stations not being 'clean' simply doesn't fly here. Other countries have different priorities so yes, it could happen elsewhere, but for a US HF broadcaster to do this is unusual. 6034 is slightly off the usual 5 khz allocation - it might be someone on 6035 with a bad transmitter or spurs from a bad Marti transmitter from 6030 (which you noted) which wouldn't surprise me in the least.

On the other hand, Habana has been doing this for many years. Wouldn't surprise me at all.

Mike

 

[wv2vvl]

That statement about AM BC stations not being 'clean' simply doesn't fly here. Other countries have different priorities so yes, it could happen elsewhere, but for a US HF broadcaster to do this is unusual. Habana, on the other hand, has been doing this for many years. 6034 is slightly off the usual 5 khz allocation - it might be someone on 6035 with a bad transmitter or spurs from a bad Marti transmitter from 6030 (which you noted) which wouldn't surprise me in the least.

Mike

30.71 is a harmonic from an HF BC station. I have no idea who they are but I've spent several solar cycles chasing BC harmonics above 30 MHz, so they do exist. There is/was a group on io involved with these things which do exist. From the numbers, 6.034 seems like a candidate for this one's fundamental. (6034/5=30.17). The other numbers fall outside legal HF SW segments. Feel free to disagree. Ill report what I find. As of 0245 UTC I see no signal on either freq.

FYI, I checked for a R. Marti harmonic on 30.15 & found nothing. That's 5x6.030. U.S. Gov. stations like this one & WWV run clean stations.

 

[ka3jjz]

Indeed -- I don't disagree, but let's find out who exactly this is first. Then file a report and see what happens. Should be interesting to find out

Mike

 

[wv2vvl]

I have a long time active ham buddy in central TN who I will enlist in this project. Since he is far from me in suburban Phila, there will likely be differences in reception that should be interesting. I want to ID this guy. I'll give the FCC a call this week & report 30.17 & see what kind of support they might provide. They have a thing about out of band emissions so I hope to get some support as a licensed ham reporting out-of-band operation. Thirty-dot-17 is military spectrum.

I saw how seriously they take this kind of report when I happened to visit their monitoring station in Allegan, MI after I happened to drive by. I couldn't get an unannounced tour as they were doing training but I checked out their DF array of rhombic antennas behind their building.

 

[wv2vvl]

26 June 2024 30.17 0303+ UTC carrier S9+10 w/QSB, deep fading. Weak audio American male. Nothing on 6.034.

Jack
W2INF

 

[wv2vvl]

I have a long time active ham buddy in central TN who I will enlist in this project. Since he is far from me in suburban Phila, there will likely be differences in reception that should be interesting. I want to ID this guy. I'll give the FCC a call this week & report 30.17 & see what kind of support they might provide. They have a thing about out of band emissions so I hope to get some support as a licensed ham reporting out-of-band operation. Thirty-dot-17 is military spectrum.

I saw how seriously they take this kind of report when I happened to visit their monitoring station in Allegan, MI after I happened to drive by. I couldn't get an unannounced tour as they were doing training but I checked out their DF array of rhombic antennas behind their building.

I've heard that this FCC monitoring station has been automated, so no staff there now.

 

[W5KK]

That statement about AM BC stations not being 'clean' simply doesn't fly here. Other countries have different priorities so yes, it could happen elsewhere, but for a US HF broadcaster to do this is unusual. 6034 is slightly off the usual 5 khz allocation - it might be someone on 6035 with a bad transmitter or spurs from a bad Marti transmitter from 6030 (which you noted) which wouldn't surprise me in the least.

On the other hand, Habana has been doing this for many years. Wouldn't surprise me at all.

Mike

Also, AM broadcast stations are required to make harmonic measurements one per year to prove harmonics are -80 dBc or greater. That doesn’t mean everyone complies or something hasn’t happened since the last measurement but, generally, the majority of AM broadcast stations don’t have harmonic emissions issues.

 

[wv2vvl]

If it wasn't found on 15085 it's not likely to be a harmonic. It should be divisible and land on a BC frequency if that was the case. More likely a spur from a transmitter somewhere. If you hear it again, it would be interesting to find out who it is.

Mike

27June 2024 30.170 S9+10 w/QSB & weak audio.

 

[ecps92]

27June 2024 30.170 S9+10 w/QSB & weak audio.

Have you tried x3 in the FM Band ??

 

[wv2vvl]

27June 2024 30.170 S9+10 w/QSB & weak audio.

0740 UTC This is in AM mode. American male speech w/QSB. Hard to make out. Nothing on 15.085. Gave frequency as 9.350 MHz AM. (WWCR). 9.350 S9+20dB.