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Connecting New Antenna to Old Radio

Tube Era Tuner

New Member
Jul 30, 2022
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Hello, first post, first of many questions.
I've got a 1953 Hallicrafters S-38C that's in good working order. Having some disappointing results with reception. I ran a 32 foot long (all the space available) single wire antenna in my attic that runs roughly north-south. I live in California's Central Valley. I get great AM reception, but shortwave reception is disappointing (can receive WWV and occasional late evening broadcast from Radio New Zealand, but beyond that just mostly faint signals with a terrible signal-to-noise ratio).
Attic Antenna.jpg


After reading a bunch of rave reviews about the MLA-30+ antenna, I ordered one. Plan to hang it from the ceiling in an upstairs room where the radio lives, in a way that will allow the loop to be rotated to get the best reception. Only problem is that like every other purpose-built antenna it comes with a coaxial lead, and my radio isn't exactly set up for that:
Antenna Screws.jpg


So my question is what sort of adapter(s) do I need in order to connect the antenna to my radio? I'm good with electrical fabrication (I held an IPC J-STD-001 soldering certificate with Space Addendum while working at NASA, fabricated an endless array of diagnostic cables for 18 months at the National Ignition Facility, etc.) but I don't know jack about electronics or radio theory.

Oh, this tidbit from the owner's manual might be helpful:
Antenna Instructions.JPG

I also have a full schematic if that's helpful.

20220730_120815.jpg


Thanks!

Bill
 
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That is an F (75 Ohms impedance coaxial) to 300 Ohms impedance (twinlead) transformer, to use coaxial cable to the antenna instead of twinlead. The MLA "box" has F connectors on it, so should work fine.
 
Great! As stated, I'm good with hardware and hands-on stuff, but my understanding of electronics and radio are extremely limited.
MLA-30+.jpg

There is a size discrepancy between the (SMA?) connectors on the "box" and the F-type connector on the adapter. I ordered a pair of these:
Amazon product ASIN B00CVTT8XIHopefully that'll take care of things.

Thanks
 
Oops, I thought that was an F connector. Could get an F Female to SMA adaptor from eBay or Amazon,
414An9TLEXL._AC_.jpg


I got a set of these from Amazon for my Nano-VNA (Vector Network Analyzer and Tiny-SA (Spectrum Analyzer) kits.
 
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