I sometimes scan various bands on my Kenwood F6A, to discover what's on the air, and came across 300.125 MHz, or very near that. I found voice transmissions going on during the late evening. It could be occurring during other times, but it seems consistent between 10pm and Midnight. There are Spanish speaking men and woman have very brief transmissions with other. I do not understand enough Spanish to know what they are saying.
What seems unusual, to me, is the type of transmission, and the fact that there is no record in the FCC ULS of any assignments on or near that frequency. The ULS only has two listings nationwide between 300 and 301 MHz, and they are both inactive licenses.
According to the frequency spectrum allocations, this frequency is allocated for mobile, mobile satellite, or fixed; and it is government exclusive.
The transmissions, as I mentioned, are brief, and there are, at least, 4 or 5 people. Each transmission ends with a quick burst of three DTMF-like tones, which, together, last only about half a second. The people seem to be coordinating something. It seems more like information being passed, rather than casual talk.
Another thing about the transmissions is that they are sometimes distorted, as if the mode cannot be distinquished by the radio. Sometimes they come in well using FM, and other times they can be heard well using AM. The signal appears to zero beat on 300.125 MHz. I have wondered whether I am picking up a harmonic frequency. I have tried various multiples or fractions of the frequency, and have not found it elsewhere.
The signal at my house, near Patterson and Hollister, is very strong. In fact, if I use the radio's attentuator, the signal is still full scale.
Has anyone else come across this? Would someone else try listening, to see whether they receive it, or understand it?
---Michael, NO6O
Michael
The 300 MHz range is usual reserved for tactical aircraft use - 300.125 being a popular frequency... see:
http://www.qsl.net/n4jri/mil_tact.htm
As I recall, it is one of the main freq for USAF Lakenheath, England.
The Spanish (and I'm sure Mexican) AFs use the freq also.
Michael 805.886.8887
W7HUT
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On Oct 12, 2009, at 9:59, michael@reynoldsoffice.com wrote:
I sometimes scan various bands on my Kenwood F6A, to discover what's on the air, and came across 300.125 MHz, or very near that. I found voice transmissions going on during the late evening. It could be occurring during other times, but it seems consistent between 10pm and Midnight. There are Spanish speaking men and woman have very brief transmissions with other. I do not understand enough Spanish to know what they are saying.
What seems unusual, to me, is the type of transmission, and the fact that there is no record in the FCC ULS of any assignments on or near that frequency. The ULS only has two listings nationwide between 300 and 301 MHz, and they are both inactive licenses.
According to the frequency spectrum allocations, this frequency is allocated for mobile, mobile satellite, or fixed; and it is government exclusive.
The transmissions, as I mentioned, are brief, and there are, at least, 4 or 5 people. Each transmission ends with a quick burst of three DTMF-like tones, which, together, last only about half a second. The people seem to be coordinating something. It seems more like information being passed, rather than casual talk.
Another thing about the transmissions is that they are sometimes distorted, as if the mode cannot be distinquished by the radio. Sometimes they come in well using FM, and other times they can be heard well using AM. The signal appears to zero beat on 300.125 MHz. I have wondered whether I am picking up a harmonic frequency. I have tried various multiples or fractions of the frequency, and have not found it elsewhere.
The signal at my house, near Patterson and Hollister, is very strong. In fact, if I use the radio's attentuator, the signal is still full scale.
Has anyone else come across this? Would someone else try listening, to see whether they receive it, or understand it?
---Michael, NO6O
SBARC-list mailing list SBARC-list@lists.netlojix.com http://lists.netlojix.com/mailman/listinfo/sbarc-list
Hi Michael,
Thank you for the link! I see that the frequency I found is listed there.
If I am hearing Mexican aviators, I wonder where they are located, with the signal being so strong.
---Michael, NO6O
On Mon, 12 Oct 2009 10:26:37 -0700, Michael Ditmore michael@rangefire.com wrote:
Michael
The 300 MHz range is usual reserved for tactical aircraft use - 300.125 being a popular frequency... see:
http://www.qsl.net/n4jri/mil_tact.htm
As I recall, it is one of the main freq for USAF Lakenheath, England.
The Spanish (and I'm sure Mexican) AFs use the freq also.
Michael 805.886.8887
W7HUT
michael@reynoldsoffice.com wrote:
I sometimes scan various bands on my Kenwood F6A, to discover what's on the air, and came across 300.125 MHz, or very near that. I found voice transmissions going on during the late evening. It could be occurring during other times, but it seems consistent between 10pm and Midnight. There are Spanish speaking men and woman have very brief transmissions with other. I do not understand enough Spanish to know what they are saying.
What seems unusual, to me, is the type of transmission, and the fact that there is no record in the FCC ULS of any assignments on or near that frequency. The ULS only has two listings nationwide between 300 and 301 MHz, and they are both inactive licenses.
Most likely pirate satellite transmissions.
http://www.wired.com/politics/security/news/2009/04/fleetcom
-- Jay Hennigan - CCIE #7880 - Network Engineering - jay@impulse.net Impulse Internet Service - http://www.impulse.net/ Your local telephone and internet company - 805 884-6323 - WB6RDV
Hi Jay,
This seems unlikely, because the signal is so strong, unless you're saying the people are local. The signals are booming in, even with the attenuator enabled.
---Michael, NO6O
Most likely pirate satellite transmissions.
http://www.wired.com/politics/security/news/2009/04/fleetcom
-- Jay Hennigan - CCIE #7880 - Network Engineering - jay@impulse.net Impulse Internet Service - http://www.impulse.net/ Your local telephone and internet company - 805 884-6323 - WB6RDV
michael@reynoldsoffice.com wrote:
Hi Jay,
This seems unlikely, because the signal is so strong, unless you're saying the people are local. The signals are booming in, even with the attenuator enabled.
How much attenuation?
I wouldn't think that Mexican fighter pilots would be that close. No real obstructions between here and a geosynchronous bird, however.
Alternatively, it's a marine or business band transmission and you're picking up a birdie or image. The tone bursts at the end of the transmission are indeed unusual. Is there a "tail" like a double squelch or anything to indicate you're listening to a repeater?
I'm not that far from you, can take a listen. I assume you're using an omni antenna like an outdoor discone?
Anyone know of people good at transmitter hunting on the list? On second thought it could be local pot farmers and they aren't usually all that friendly...
Can you capture an mp3 and put it online?
-- Jay Hennigan - CCIE #7880 - Network Engineering - jay@impulse.net Impulse Internet Service - http://www.impulse.net/ Your local telephone and internet company - 805 884-6323 - WB6RDV
Hi Jay,
I'm using a Diamond SRH320A triband antenna on a Kenwood F6A---inside the house. The radio is using 20dB of attenuation.
There is no repeater tail, and each transmission is usually no more than a few seconds. The transmissions go back and forth for several minutes, and are sometimes followed by a break of a few minutes. I will see whether I can record it to a file later tonight.
---Michael, NO6O
On Mon, 12 Oct 2009 14:14:05 -0700, Jay Hennigan jay@west.net wrote:
How much attenuation?
I wouldn't think that Mexican fighter pilots would be that close. No real obstructions between here and a geosynchronous bird, however.
Alternatively, it's a marine or business band transmission and you're picking up a birdie or image. The tone bursts at the end of the transmission are indeed unusual. Is there a "tail" like a double squelch or anything to indicate you're listening to a repeater?
I'm not that far from you, can take a listen. I assume you're using an omni antenna like an outdoor discone?
Anyone know of people good at transmitter hunting on the list? On second thought it could be local pot farmers and they aren't usually all that friendly...
Can you capture an mp3 and put it online?
----- Forwarded Message ---- From: Alain Michel opalockamishabob@yahoo.com To: michael@reynoldsoffice.com Sent: Monday, October 12, 2009 3:48:32 PM Subject: Re: [Sbarc-list] 300.125 MHz
Mike,
I will monitor the freq down here and see what I can hear. You know that there are a couple of other great resources that might assist you in locating the source.
Have you tried www.radioreference.com? They've got a great database and ears everywhere!
You might also try several of the Yahoo "milcom" groups.
Alan...KI6HPO...N.E. San Diego
________________________________ From: "michael@reynoldsoffice.com" michael@reynoldsoffice.com To: sbarc-list@lists.netlojix.com Sent: Monday, October 12, 2009 9:59:06 AM Subject: [Sbarc-list] 300.125 MHz
I sometimes scan various bands on my Kenwood F6A, to discover what's on the air, and came across 300.125 MHz, or very near that. I found voice transmissions going on during the late evening. It could be occurring during other times, but it seems consistent between 10pm and Midnight. There are Spanish speaking men and woman have very brief transmissions with other. I do not understand enough Spanish to know what they are saying. What seems unusual, to me, is the type of transmission, and the fact that there is no record in the FCC ULS of any assignments on or near that frequency. The ULS only has two listings nationwide between 300 and 301 MHz, and they are both inactive licenses. According to the frequency spectrum allocations, this frequency is allocated for mobile, mobile satellite, or fixed; and it is government exclusive. The transmissions, as I mentioned, are brief, and there are, at least, 4 or 5 people. Each transmission ends with a quick burst of three DTMF-like tones, which, together, last only about half a second. The people seem to be coordinating something. It seems more like information being passed, rather than casual talk. Another thing about the transmissions is that they are sometimes distorted, as if the mode cannot be distinquished by the radio. Sometimes they come in well using FM, and other times they can be heard well using AM. The signal appears to zero beat on 300.125 MHz. I have wondered whether I am picking up a harmonic frequency. I have tried various multiples or fractions of the frequency, and have not found it elsewhere. The signal at my house, near Patterson and Hollister, is very strong. In fact, if I use the radio's attentuator, the signal is still full scale. Has anyone else come across this? Would someone else try listening, to see whether they receive it, or understand it? ---Michael, NO6O
Hi Alan,
Thank you for monitoring in San Diego. I checked RadioReference.com, and the frequency is included in the forum regarding tactical operations and refueling. But there is nothing specific to California that I could find. I have a copy of the Southern California Frequency Directory from ScannerStuff.com, and there is no mention of it.
I confirmed that I can easily record from my HT to an audio file. However, I wonder whether doing that would violate any laws concerning retransmission (providing audio samples) of communications---especially since they may be government communications.
---Michael, NO6O
On Mon, 12 Oct 2009 15:56:29 -0700 (PDT), Alain Michel wrote:
----- Forwarded Message ---- FROM: Alain Michel TO: michael@reynoldsoffice.com SENT: Monday, October 12, 2009 3:48:32 PM SUBJECT: Re: [Sbarc-list] 300.125 MHz
Mike,
I will monitor the freq down here and see what I can hear. You know that there are a couple of other great resources that might assist you in locating the source.
Have you tried www.radioreference.com [1]? They've got a great database and ears everywhere!
You might also try several of the Yahoo "milcom" groups.
Alan...KI6HPO...N.E. San Diego
Links: ------ [1] http://www.radioreference.com
To my surprise, there were no transmission (that I could hear) last night, after nearly a week of nightly signals. I had planned to record it, in case someone could confirm the type of signals. I'll check again tonight. If these are tactical communications from our government, why would they be in Spanish? And, if they are from Mexico, why is the signal so incredibly strong here?
---Michael, NO6O
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Alain Michel -
Jay Hennigan -
Michael Ditmore -
michael＠reynoldsoffice.com