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RF Guru

Pomona Electronics BNC Male to SMA Male 50 Ω RF Adapter (Straight)

Pomona Electronics BNC Male to SMA Male 50 Ω RF Adapter (Straight)

€32,00 EUR
€32,00 EUR
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Tax included.

The Pomona 4288 is a compact, straight between-series RF adapter that converts SMA male (plug) to BNC male (plug) while maintaining a 50 Ω coaxial interface. It’s the “no-drama” way to bridge lab gear, filters/attenuators, and SDR/receiver inputs when your setup mixes SMA and BNC.

Ready to deploy: If you have a device with a BNC female input and another with an SMA female interface, this is the rigid adapter that couples them directly ... short, solid, and rated well beyond HF/VHF.

What this adapter is for

  • SDR + test gear interconnects ... adapting measurement chains (generators, analyzers, tracking sources) where impedance stability matters.
  • Receiver front-end accessories ... quickly insert attenuators, band-pass filters, LNAs, or isolators that come with SMA or BNC.
  • Field and shack convenience ... one adapter that lives on a device to standardize your patch cables.
Practical RF note: A rigid adapter keeps the “extra coax length” near zero ... helpful when you’re trying to keep common-mode pickup and connector-to-connector slop out of sensitive RX setups.

Specs at a glance

Parameter Value
Manufacturer / MPN Pomona Electronics / 4288
Adapter type Plug-to-plug ... between-series
Ends SMA plug (male pin) ⇄ BNC plug (male pin)
Center gender Male to male
Impedance 50 Ω
Max frequency 12.4 GHz (nominal)
Style / mounting Straight ... free-hanging (in-line)
Fastening BNC bayonet lock ... SMA threaded coupling
Contacts / plating Brass center contacts ... gold-plated contacts
Body / finish Beryllium copper body ... gold/nickel finishes (per manufacturer spec)
Dielectric PTFE
Operating temperature -65 °C to +165 °C

Installation notes (so it stays reliable)

  • Support heavy cables ... don’t let a stiff coax hang off the adapter and twist the connector stack.
  • SMA is not a wrench fight ... snug is enough; if you use tools, use the correct flats and avoid over-torque.
  • Keep interfaces clean ... dust/oils on SMA threads and contact faces can raise loss and intermittency over time.

Safety note

RF adapters are not “high-voltage test leads.” Follow the manufacturer’s voltage guidance and avoid handling live connections.

Install with confidence: Use this adapter where you want a compact, impedance-correct transition between SMA and BNC ... without introducing a patch cable that becomes its own little noise antenna.

Mini-FAQ

  • Is this 50 Ω or 75 Ω? ... 50 Ω (the standard for most RF lab gear and ham RF accessories).
  • What does “BNC male to SMA male” actually connect to? ... it mates with a BNC female jack and an SMA female jack.
  • Is it OK for HF? ... absolutely. It’s rated far above HF; HF performance is typically limited by the rest of the chain, not this adapter.
  • Can I hang a long cable from it? ... mechanically it’s better to strain-relief heavy/stiff coax to avoid loosening or damaging connectors.
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