{"id":9,"date":"2026-10-28T00:05:27","date_gmt":"2026-10-28T00:05:27","guid":{"rendered":"https:\/\/k0axx.net\/?page_id=9"},"modified":"2026-10-28T01:23:03","modified_gmt":"2026-10-28T01:23:03","slug":"rf-library","status":"publish","type":"page","link":"https:\/\/k0axx.net\/?page_id=9","title":{"rendered":"RF Technical Library"},"content":{"rendered":"

ANTENNA SYSTEMS \/ RECEIVERS \/ PROPAGATION<\/p>

These notes explain why a radio path works\u2014or fails\u2014and what can be measured to improve it. The goal is practical, repeatable station engineering rather than vague claims about equipment gain or propagation.<\/p>

01<\/span>

Antenna Fundamentals<\/a><\/h3>

Wavelength, polarization and installation<\/p><\/article>

02<\/span>

Feed-Line Loss<\/a><\/h3>

Loss in dB, power budget and coax choices<\/p><\/article>

03<\/span>

Low-Noise RX Systems<\/a><\/h3>

LNA position, noise figure and gain<\/p><\/article>

04<\/span>

RF Relay Sequencing<\/a><\/h3>

PTT order, isolation and LNA protection<\/p><\/article>

05<\/span>

Power Dividers & Stacking<\/a><\/h3>

Amplitude, phase, spacing and verification<\/p><\/article>

06<\/span>

Terrestrial Path Planning<\/a><\/h3>

Radio horizon, terrain and atmospheric paths<\/p><\/article>

07<\/span>

VHF\/UHF Propagation<\/a><\/h3>

Sporadic-E, meteors, tropo and EME<\/p><\/article>

08<\/span>

Common-Mode & RFI<\/a><\/h3>

Chokes, shielding and measurement<\/p><\/article>

09<\/span>

Rover Operations<\/a><\/h3>

Field layout, IF choices and antenna systems<\/p><\/article>

10<\/span>

K5QE Presentations<\/a><\/h3>

Marshall Williams: original papers and slide decks<\/p><\/article>

11<\/span>

Field Day<\/a><\/h3>

Portable station planning and operating<\/p><\/article>

12<\/span>

HF Contesting<\/a><\/h3>

CW, SSB and digital operating strategy<\/p><\/article>

13<\/span>

VHF & Above Contesting<\/a><\/h3>

50 MHz through microwave grids<\/p><\/article><\/div>\n

How these articles are organized<\/h2>

Most projects begin with a requirement, a drawing or calculation, and a test plan. Preliminary dimensions, simulations and assumed conditions should never be presented as measured results. Where no field data exist, the text identifies the discussion as guidance or a project concept.<\/p>

Featured reference material<\/h2>

The receiver and protection guides are key starting points: Low-Noise Reception Guide<\/a> and Relay & Sequencing Guide<\/a>. Marshall K5QE\u2019s primary source and related presentations are gathered in his technical archive<\/a>.<\/p>","protected":false},"excerpt":{"rendered":"

Detailed amateur radio engineering notes on antennas, feed systems, RF protection and propagation.<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-9","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/k0axx.net\/index.php?rest_route=\/wp\/v2\/pages\/9","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/k0axx.net\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/k0axx.net\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/k0axx.net\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/k0axx.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=9"}],"version-history":[{"count":1,"href":"https:\/\/k0axx.net\/index.php?rest_route=\/wp\/v2\/pages\/9\/revisions"}],"predecessor-version":[{"id":50,"href":"https:\/\/k0axx.net\/index.php?rest_route=\/wp\/v2\/pages\/9\/revisions\/50"}],"wp:attachment":[{"href":"https:\/\/k0axx.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=9"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}