Maybe you are receiving interference from a DMR repeater at the SW
Memorial Hospital?
73
John Denison
KD5YOU
On 3/3/2025 5:03 PM, baaelectronics via BVARC wrote:
Hi all, lately I've been having some interference come up when trying
to join in on the Stir-Crazy nets when I am portable during the week.
Around the HCU campus between 12:00 and 13:50, I notice the same four
narrow peaks of S9 splattering noise - not quite harmonics of 60Hz but
not just static either. It reminds me of what DMR sounds like on an FM
receiver. They are strongest on 146.915, 146.935, 146.955, and
146.995MHz. 146.94MHz is noisy but sometimes copyable. My rudimentary
understanding of RF harmonics led me to check 440.86, but nothing was
heard there.
Any advice for someone who just has an HF radio and dual-band HT to
investigate more? I take the antenna off my IC-W32 and it all goes
away (including receiving 146.94 too), so DF’ing that way (unless I
find the fundamental) is out of the question.
A thought was to have a classmate use an RTL-SDR to scan outside
amateur bands to see if there are harmonics elsewhere, but I have yet
to do that.
A person in a suit smiling Description automatically generated
*Blake Alley *| BAA Electronics**
QRZ: N5BAA Mobile: (281) 450-5785
[email protected] <mailto:[email protected]>
A blue circle with white letters on it Description automatically
generated <https://www.linkedin.com/in/baaelectronics/>A red and white
play button Description automatically generated
<https://www.youtube.com/@baaelectronics>A blue circle with a white v
in the middle Description automatically generated
<https://vimeo.com/baaelectronics>A logo of a camera Description
automatically generated <https://www.instagram.com/baaelectronicsyt/>
________________________________________________
Brazos Valley Amateur Radio Club
BVARC mailing list
[email protected]
http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org
Publicly available archives are available here:https://www.mail-archive.com/[email protected]/
________________________________________________
Brazos Valley Amateur Radio Club
BVARC mailing list
[email protected]
http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org
Publicly available archives are available here:
https://www.mail-archive.com/[email protected]/
