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 Post subject: Re: The Listening Post
PostPosted: Sep Sat 15, 2018 7:54 pm 
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Joined: Jun Sat 18, 2011 3:36 am
Posts: 2115
Location: Milton, FL 32570
If I get a chance I'll see if I can see it. The link I posted showed tower height at 0 ft.

The other day I was talking to a ham who was setting up a quad array but it was only 4ft off the ground, They had set 20 4ft posts and when he showed up to assemble the antenna it was in the wrong location so thye had to move all the posts.

jason


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 Post subject: Re: The Listening Post
PostPosted: Sep Sun 16, 2018 9:26 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 2384
Location: Virginia Beach Va
Just kidding! You can see it on google satellite, its heavily wooded although above the tree canopy behind his rather large house.
Many people wonder who the broadcasts are directed to. How many people have SSB equipped radios that aren't SWL , collectors or Hams? Or even know what it is?


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 Post subject: Re: The Listening Post
PostPosted: Sep Sun 16, 2018 10:43 pm 
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Joined: Jun Sat 18, 2011 3:36 am
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Location: Milton, FL 32570
Highly religious area, tax deduction for doing the lords work? who knows.

We have roadside preachers who yell at traffic . We're like smalltown crazy. I moved here in 1979 military brat and my dad loved the area so we stayed. Ice cold rivers good hunting and fishing. My dad compared it to Whidbey Island, Meridian Mississippi and here was his choice.

I'll probably never leave because of the woods and creeks ice cold and clear. Don't like the beaches as the sun bakes the salt into your skin.
jason


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 Post subject: Re: The Listening Post
PostPosted: Sep Mon 17, 2018 3:00 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 2384
Location: Virginia Beach Va
I used to cave dive when I was younger and hit most of the springs west of Gainesville, the closest to you would be Vortex in Ponce De Leon. I've never even seen Wakulla , I suppose because they didn't allow diving. Another one out that way is Morrison . We went in the middle of the night. I'll never forget wading through a Cypress swamp in pitch black to reach the cavern entrance . One of the worst electrical storms I've ever been in was in Ponce De Leon. I thought surely we were going to be struck.


Last edited by davep on Sep Mon 17, 2018 4:47 am, edited 1 time in total.

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 Post subject: Re: The Listening Post
PostPosted: Sep Mon 17, 2018 4:02 am 
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Joined: Apr Fri 28, 2006 5:57 am
Posts: 341
Location: brownsville, kentucky 42210
davep wrote:
In the mornings if props are good - Sultanate of Oman 15.140 , it's a relay of a local FM station. Although I haven't tuned in lately , the only difference from a western FM music station is the dj's accent, and he's not from there.
They may have shifted the time from the internet schedules , checking at 1400 UTC today - super weak, not in english at that time and the whole thing was blown away by RHC at 1500. 19 meters (15 mhz) and shorter has suffered with the current solar cycle just a causal observation. I'll log it if I hear it.
VOA English has been listenable here recently with its "Border crossings" music program at 15460 17-18 utc

Radio New Zealand has been good also @ 7425 , very early though I think off by 1100 UT.
There's not much in 11-12 mhz during the day in English except for Alex Jones 12.160, if you enjoy his outrage.
( when he appeared on TV news recently , the wife who pays no attention and only listens to satellite radio said " that's the guy on all your radios! " :|

31 meters ( 9 mhz ) is great day and night, but in English dominated by Peter J Peters ( even though he's dead, I think) and $tair recently caged for sexual predation even though he continued to keep shortwave alive from prison.

There are a few "Clandestines " many are brokered from transmitters in France and in West African languages, and a few to the east.

One pirate goes all day sometimes several days a week in AM around 6870-80 ,sometimes good here , sometimes marginal.

The usual marine wx, fax , aero and other utilities go on every day .
I'll try to log here more if there's interest, but shortwave day can be boring unfortunately.

Milton is home to the "USB preacher " John Hill 15555 i believe.
Could you drop by there and get my qsl from a year ago? 8)

Jake Wells: no WRVA?

No WRVA found a french station between 700 and 800 khz not sure what to think of that.

_________________
Don't assume anything about what i say.
I'm real slow and do crappy work.


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 Post subject: Re: The Listening Post
PostPosted: Sep Mon 17, 2018 4:49 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 2384
Location: Virginia Beach Va
It's at 730 KHZ got it here, very strong
CKAC Quebec 50k

357z News , mention of Quebec
Very nice low noise signal
One click up CFZM is also doing well S7-9 with "The Conspiracy Show"

Pirate listening last night was a washout . Horrible conditions , qrn. My antenna was lowered for the storm not helping.
Part of "Fess Parker Radio " and a Unid neither were really listenable

4885 KHZ Radio Clube Do Para also doing exceptional here tonight @ 4Z playing what I am saying is Brazilian or regional pop not in Shazam database. Although one was a "Guess Who " cover in Portuguese. Ha


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 Post subject: Re: The Listening Post
PostPosted: Sep Tue 18, 2018 5:06 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 2384
Location: Virginia Beach Va
6880 KHZ AM 9/18/18
Relay Station
@1550 decent reception here with occasional fades playing Pop selections from the 1960s
Pleasant Valley Sunday, sugar shack, mountain of love , Venus etc.


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 Post subject: Re: The Listening Post
PostPosted: Sep Thu 20, 2018 4:01 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 2384
Location: Virginia Beach Va
6880 KHZ AM 9/19/18
Relay Station
@1440z good reception SIO 333 today , station WXNZ 98.1 LPFM in Skowhegan Maine getting a boost
playing a wide variety / Dueling banjoes, Be Bop a Lula , Roy Orbison , etc with a live DJ


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 Post subject: Re: The Listening Post
PostPosted: Sep Sun 23, 2018 12:18 am 
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Joined: Jun Mon 24, 2013 3:00 pm
Posts: 1238
Location: Champaign IL 61822
Here's a spectrum and waterfall from my recently improved (better line pickup
isolation) antenna system. This is at 6 PM , the sun is still up.

This is the best S/N I've yet obtained.

Attachment:
LFSpectrum.jpg
LFSpectrum.jpg [ 199.31 KiB | Viewed 1194 times ]


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 Post subject: Re: The Listening Post
PostPosted: Sep Sun 23, 2018 1:05 pm 
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Joined: Apr Thu 12, 2007 3:24 am
Posts: 1851
Location: Milwaukee,WI
Are those spikes ALL actual VLF signals or are some of them images from the BCB?


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 Post subject: Re: The Listening Post
PostPosted: Sep Sun 23, 2018 1:39 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 2384
Location: Virginia Beach Va
I was wondering the same thing . Probably DGPS . Interesting how the noise increases as it gets lower. I have noticed it on knob radios, here you can see it graphically


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 Post subject: Re: The Listening Post
PostPosted: Sep Sun 23, 2018 2:24 pm 
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Joined: Jun Mon 24, 2013 3:00 pm
Posts: 1238
Location: Champaign IL 61822
All of those spikes appear to be real LF signals. They are audible on my BC-453, The "image" frequency
is up 250 MHz as the first IF is 125 MHz. The signal goes through an emitter follower at the antenna,
a 9 pole 485 kHz low pass filter, a 15 dB single transistor amplifier, a 30 MHz low pass filter,
the mixer, then a bandpass filter 124-155 MHz and then into the miasma of ICs that's the
Airspy, which does have images and spuriae galore. But I've got all of those out of display range.

This picture was generated during a test of some new power line noise blocker transformers
(Minicircuits ADT1-1) I just got. These are tiny SMT things that are specced 0.15-400MHz but
in fact work fine down all the to WWVB. They are in fact just one turn of wire each side on a
tiny ferrite bead. The big deal is that the interwinding capacitance is an astoundingly low 4.5 pF.
They are mounted on circuit board with long leads and no ground plane nearby so that
grounds don't add capacitance. There is one at each end of the transmission line, so they block
noise from the power line from getting into the transmission line, and noise pickup up by the
line from getting into the antenna preamp. There is no DC connection at all to the line.

These new transformers really do make a total of well over 20 dB reduction in noise pickup,
at a few frequencies more than that.

For this shot the antenna was 100 feet lying on the ground; for BCB and SW use its only 30 feet.


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 Post subject: Re: The Listening Post
PostPosted: Sep Sun 23, 2018 2:38 pm 
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Joined: Jun Mon 24, 2013 3:00 pm
Posts: 1238
Location: Champaign IL 61822
davep wrote:
I was wondering the same thing . Probably DGPS . Interesting how the noise increases as it gets lower. I have noticed it on knob radios, here you can see it graphically


Signals 280-323 are mostly DGPS. The big one is in Michigan. These will be going away next year.
Look carefully and you can see the IDs of the stronger beacons.

Later at night the S/N got even better.
The noise you see at the bottom is a harmonic of some nasty switching supply. You should see the
power of it without the transformers!


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 Post subject: Re: The Listening Post
PostPosted: Sep Sun 23, 2018 5:14 pm 
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Joined: Apr Thu 12, 2007 3:24 am
Posts: 1851
Location: Milwaukee,WI
Some day I'll have to track down this noise source. The pic shows 1800-6000 khz but the noise actually goes down to about 300 khz and stops just above 6000 khz. Luckily its not there every day or all day long and I hear it way less at night.

My VLF spectrum looks like your only because of BCB images. I live within a few miles of a bunch of powerhouse stations. I'll have to take another look since I made a 5 pole BCB notch filter.


Attachments:
hash.jpg
hash.jpg [ 44.62 KiB | Viewed 1177 times ]
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 Post subject: Re: The Listening Post
PostPosted: Sep Mon 24, 2018 3:23 pm 
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Joined: Jun Mon 24, 2013 3:00 pm
Posts: 1238
Location: Champaign IL 61822
forumuser: if you are interested I can send you or post the filters I use to remove the BCB:
one is a 1.8 MHz hi-pass and one a 485 kHz lo-pass, both with lots of poles and
one or two zeros. These are not cheap to make since they need accurate polystyrene or
mica caps and $2 or so coils (all readily available at Mouser, Digikey, or justradios.)

BUT: these are designed for 50 to 100 ohms and if your receiver is not accurately
and resistively in that area their response is not very flat in the passband. My preamp
(at filter output) is 91 ohms and the driver at the antenna about 40.


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 Post subject: Re: The Listening Post
PostPosted: Sep Tue 25, 2018 3:57 am 
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Joined: Apr Thu 12, 2007 3:24 am
Posts: 1851
Location: Milwaukee,WI
I can't seem to find the schematic right now but I built a BCB bandstop filter which attenuates the band about 40db on at 1400khz and 50db at 620khz. I'm not exactly sure where the filter ends are. I have no idea what my antennas are for impedance on various frequencies so I wasn't worried about using precision components. The SDRplay receiver is supposedly 50 ohm input. I have a cheap antenna noise bridge laying around. I suppose I should put a battery in it and make some measurements.


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 Post subject: Re: The Listening Post
PostPosted: Sep Thu 27, 2018 2:29 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 2384
Location: Virginia Beach Va
6880 AM 1318 UTC 27 September 2018
The Relay Station
1318 The Fixx/ one thing leads to anothe
1320 Kool and the gang / celebrate
1323 Bruce Springsteen/ born in the USA
1328 Men at work/ down under

S5 -7


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 Post subject: Re: The Listening Post
PostPosted: Sep Sat 29, 2018 2:53 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 2384
Location: Virginia Beach Va
Unid 6940 AM 2158 UTC 9/28/18

2158 Ondrej Havelka/ they can't take that away from me
2200 Ondrej Havelka / Kalamazoo
2209 Ondrel Havelka/ It's only a paper moon
2212 anyone else but me
2215 I'm putting all my eggs in one basket
2221 Lady is a tramp
2225 Mr Sandman
2228 Sonny Boy
2230 So Rare
2232 night and day
2236 Oh Miss Hannah
2236 off

S9 here


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 Post subject: Re: The Listening Post
PostPosted: Oct Tue 02, 2018 1:29 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 2384
Location: Virginia Beach Va
5450 USB 0028 UTC 10/2/18
RAF Volmet

Abidjan Algiers Cairo Intl Dakar
Entebbe Recife Niamey Narobi Kadun Khartoum

Sinpo 33233


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 Post subject: Re: The Listening Post
PostPosted: Oct Fri 05, 2018 5:50 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 2384
Location: Virginia Beach Va
6880 AM 1630 UTC 10/5/18
The Relay station

@1630 S5 copy here with good sound playing modern pop, Imagine Dragons , Portugal the Man etc

Normally continues past 2100 UT


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