Unlike modern connector designs that replaced it, no active specification or standard exists to govern the mechanical and electrical characteristics of the so-called "UHF" connector system, making it effectively a deprecated design with no guarantee for suitability to an electrical or mechanical purpose.

[7][1] Other testing showed that one sample of UHF connectors had negligible ill effects on signals for frequencies up to 435 MHz.

[13][b] PL-259, SO-239, PL-258, and several other related labels used by military services refer to one specific mechanical design, now collectively called UHF connectors, continuing the use of the now-obsolete meaning of 'UHF'.

[4] For this reason, UHF connectors are generally usable through HF and the lower portion of what is now known as the VHF frequency range.

[19] Manufacturers typically test and warrant UHF jumpers in the 3–5 kV range.

[citation needed] UHF connectors are standard on HF amateur amplifiers rated at 1500+ Watt output.

[citation needed] In practice, voltage limit is set by the air gap between center and shield.