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Author Topic: Signal on 28.350?  (Read 516 times)

VE3OP

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Signal on 28.350?
« on: November 05, 2022, 07:07:49 AM »

I can hear a steady signal on 28.350, as can a ham friend of mine. Seems to be AM.

Anyone have any idea what this is?

Thanks.

Craig, VE3OP
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W9IQ

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Re: Signal on 28.350?
« Reply #1 on: November 05, 2022, 07:40:05 AM »

If it "seems to be AM", does that mean the signal is modulated? What does it sound like?

- Glenn W9IQ
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- Glenn W9IQ

God runs electromagnetics on Monday, Wednesday and Friday by the wave theory and the devil runs it on Tuesday, Thursday and Saturday by the Quantum theory.

KC8KTN

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Re: Signal on 28.350?
« Reply #2 on: November 05, 2022, 08:45:20 AM »

Aliens testing before invasion..

https://youtu.be/UH8liVnrU5o
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WA3SKN

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Re: Signal on 28.350?
« Reply #3 on: November 05, 2022, 08:59:15 AM »

There are plenty of signals on 10m at this time, but nothing here (Maryland) on 28.350 MHz... it might be a local noise source in your area.  Do you still have it?  At what times do you hear it?

-Mike.
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KE6SLS

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Re: Signal on 28.350?
« Reply #4 on: November 05, 2022, 09:40:01 AM »


It is digital voice (freeDV.)  Seen this note on debian-hams email list:

"Hello Debian Hams,

This would be a good chance to actually use and test some of the
software we package. `apt install freedv` and run it.
Let's get Debian folk on the air...
We'll be doing another FreeDV Activity Day on the weekend of November
5-6, 2022! This event will bring together people interested in HF
digital voice on the air for conversation and fun. Contacts using the
official application[1] as well as the SM1000 handheld microphone are
welcome.

(Note: this is different than previous Activity Days in that you have
the entire weekend, not just a 24 hour period. This may continue for
future Activity Days based on how the upcoming one goes.)

Event time: 12AM Pacific time (0700Z) on November 5 to 11:59PM (0759Z)
on November 6 (49 hours). Note: Daylight Saving Time ends in the US
during Activity Day weekend.

Suggested frequencies:
80 meters: 3.625, 3.643 or 3.693 MHz
40 meters: 7.177 MHz
20 meters: 14.236 MHz
17 meters: 18.118 MHz
15 meters: 21.313 MHz
12 meters: 24.933 MHz
10 meters: 28.330 or 28.720 MHz

(Note that LSB/DIGL is used below 10MHz as per current convention for
voice modes, USB/DIGU otherwise.)"

73
j
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K8AXW

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Re: Signal on 28.350?
« Reply #5 on: November 05, 2022, 09:43:15 AM »

Glenn, did ya haffta?   ::)
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A Pessimist is Never Disappointed!

VE3OP

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Re: Signal on 28.350?
« Reply #6 on: November 05, 2022, 11:08:06 AM »

While on SSB, it zero beats right on 28.350 and has a steady tone on either side.

Thanks for the suggestions. Except for the Alien one...
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VE3OP

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Re: Signal on 28.350?
« Reply #7 on: November 05, 2022, 11:09:07 AM »

There are plenty of signals on 10m at this time, but nothing here (Maryland) on 28.350 MHz... it might be a local noise source in your area.  Do you still have it?  At what times do you hear it?

-Mike.

It seems to be there all the time.
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SWMAN

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Re: Signal on 28.350?
« Reply #8 on: November 05, 2022, 12:47:11 PM »

 It seems to be there all the time.

So are the aliens.
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AI5BC

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Re: Signal on 28.350?
« Reply #9 on: November 05, 2022, 01:50:49 PM »

I hear a pileup with a lot of traffic.
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W9FIB

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Re: Signal on 28.350?
« Reply #10 on: November 06, 2022, 03:06:28 AM »

My older laptop had birdies all over 10M band. Just another possible source to think about.
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73, Stan
Travelling the world one signal at a time.

KC8KTN

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Re: Signal on 28.350?
« Reply #11 on: November 06, 2022, 08:32:47 PM »

Do not ignore what is the Truth... Before it is to late....
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WA3SKN

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Re: Signal on 28.350?
« Reply #12 on: November 07, 2022, 12:00:53 PM »

"On all the time".
It is probably a local noise source.  Replace antenna with a known good dummy load, or short the antenna jack (don't transmit!) and verify you lose the signal.  This verifies it is incoming via the antenna jack.  If you do not lose the signal it is incoming via the power lead, ground lead, or by direct radiation.  Nice to know before trying to locate and cure!
The answer here is "distance, filtering, and shielding", that is distance from your antenna to the source, filtering, and shielding the local source.
Next is getting the radio on a battery and powering down the house breakers.

-Mike.
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N8YX

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Re: Signal on 28.350?
« Reply #13 on: November 08, 2022, 04:20:08 PM »

My older laptop had birdies all over 10M band. Just another possible source to think about.
Computers, networking equipment and other electronics can put out all sorts of signals from their clock circuits and digital logic. I'd see about localizing it to your immediate vicinity by powering things off one at a time and seeing if the signal goes away. By "power off", that means unplugging - as some devices don't completely turn off unless power is totally removed from them.
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