Recent searches

No recent searches

Search options

Only available when logged in.
mastodon.radio is one of the many independent Mastodon servers you can use to participate in the fediverse.
Mastodon.Radio is a space for the Amateur (Ham) Radio community, anyone interested in Shortwave Listening (SWL), etc. Come join us and talk radio, technology, and more!

Administered by:

Server stats:

790
active users

mastodon.radio: AboutStatusProfiles directoryPrivacy policy

Mastodon: AboutGet the appKeyboard shortcutsView source codev4.4.2

Rick Altherr

@dysfun it's mostly a radome. The antenna is a milled plate that is a few inches tall.

ftg

@mxshift @dysfun
Very nice.
Got any pictures of the insides?
Leica makes it sound survey-grade.

Rick Altherr

@ftg @dysfun the center cap is glued down so no further disassembly

ftg

@mxshift @dysfun
Thank you for the picture.
Unfortunate that the main element does not open.
As everybody seems to just call it "Dorne-Margolin antenna element" or "a Dorne & Margolin C146-10 vertical dipole element".
And Dorne & Margolin seems to be some company.

ftg

@k5em @mxshift @dysfun
Nice find, thanks.
So that Dorne Margolin setup is 4x phased, tilted dipoles?

Justin K5EM

@ftg @mxshift @dysfun that is what the schematic seems to say, but I'm actually not completely sure now, after a lot more research. Everyone regurgitates the same schematic image, but the best image I've found of it is this one from carleton.scholaris.ca/bitstrea

ftg

@k5em @mxshift @dysfun
Strange that there are also no references to patents and patent numbers.

Justin K5EM

@ftg @mxshift @dysfun agree. There's the original Alford loop patent, but it doesn't really reflect what seems to be going on here, even though the D&M is called a modified Alford loop. patents.google.com/patent/US22

patents.google.comUS2283897A - Antenna system - Google Patents
··Web
0boosts·0favorites
Live feeds
About