We seek to understand and document all radio transmissions, legal and otherwise, as part of the radio listening hobby. We do not encourage any radio operations contrary to regulations. Always consult with the appropriate authorities if you have questions concerning what is permissible in your locale.

Show Posts

This section allows you to view all posts made by this member. Note that you can only see posts made in areas you currently have access to.

Messages - Barycenter

Pages: 1 2 [3]
Other / Unknown 8069 KHz USB 5/20/2014 0120+ U
« on: May 20, 2014, 0127 UTC »
Unknown foreign language conversation (Italian or Spanish?) in USB on 8069 KHz. Signal about S5. Do some countries have amateur bands in the 8000-8200 KHz range?

Other / Unknown 6835 KHz USB 5/10/2014 0024+ UTC
« on: May 10, 2014, 0032 UTC »
I'm new so maybe this is old news - but, unusual chatter between coastal - ship communications on 6835 kHz. Not sure the context but was in English and had references various ship-shore items. Only caught the last 4 minutes. Signal was a S7 here in MN.

Any ideas what or who this is?

Nothing here

Equipment / HF Receiving Antenna Myths
« on: May 04, 2014, 1819 UTC »
I'm new to this community and only have started up my interest in HF SWLing since the late 1970s. One thing I do know (being a scientist/engineer) is that there is a prevalent misconception on antennas for receivers vs. transmitters. Most books and online sites talk about tuning antennas to the proper length/configuration to reduce loss from reflection/impedance etc. for transmitting power.

However, this is not true for receiving antennas. In order to tune a receiver you must reverse the concept. Even if a halfwave dipole is 'tuned' by length to the correct frequency, the power or gain in your receiver depends on the impedance of your feed line and receiver input. Definitely not the same.

That said, I would like to hear other's opinions on this subject and what you have found to be the best HF antenna-receiver combination and why. Do you agree with this myth?


WRR at S5 - Johnny Cash - A Boy Named Sue

Other / Re: weird cw on 11223 lsb 5-3-14 0007z
« on: May 03, 2014, 1508 UTC »
I agree it isn't CW. Here is an attached audio recording from last night (low quality - really? 128kb upload limit???)

Signal strength really picking up now - clear S7 to S9. Fun show!

Got him here in central MN about an S5.

Other / Re: weird cw on 11223 lsb 5-3-14 0007z
« on: May 03, 2014, 0017 UTC »
Got it clear here in central MN - about an S7

Weird sounding dots only - no dashes - seems numeric

Currently have them on 8799 in central MN. About an S3 here.

HF Beacons / Re: "UFO" morse beacon on 8001 khz
« on: May 01, 2014, 0240 UTC »
Signal strength is good here in central MN.

HF Beacons / "UFO" morse beacon on 8001 khz
« on: May 01, 2014, 0234 UTC »
Sorry, I'm new to the forum - but hearing a repeating morse signal of the letters 'UFO' on 8001 khz right now.  Any idea what that is?

Pages: 1 2 [3]
HFUnderground T-Shirt
HFUnderground T-Shirt
by MitchellTimeDesigns