The right gain,
on the right band.
The FA-1 is a filter-first amplifier with passive fail-safe, powered by DC-feed. Four selectable gain steps (BP / +6 / +9 / +12 dB), four standard 50 MHz blocks across the film UHF band, or any filter built to spec. If power disappears, the filter stays in line — no dropout. Made in France.
Standard blocks
470–520 · 520–570 · 570–620 · 620–670 MHz
Selectable gain
BP / +6 / +9 / +12 dB
Filter BW
20 / 35 / 60 / 120 MHz @ −3 dB
Power
DC-feed 10–18 V
Weight
100 g
Highlights
Filter-first topology
Signal is filtered then amplified: out-of-band interferers (walkies, DECT, Wi-Fi, GSM, 4G, intercom base stations) are killed before the gain stage, not after.
Filter → amp · not the other way
Four gain steps
BP (bypass, filter only), +6 dB, +9 dB, +12 dB. You compensate exactly the coaxial cable loss — not too much, not too little.
BP / +6 / +9 / +12 dB
Passive fail-safe
Lost power? The FA-1 keeps passing signal in pure-filter mode. Typical −2 dB loss: a power failure doesn't break the recording.
0 V = passive filter
Powered by DC-feed
No separate power lead: the FA-1 draws current from the receiver's or splitter's DC-feed (AS-62, AS-122). Better still: it lets DC-feed pass through to power an active antenna upstream.
DC-feed in · DC-feed through
An aluminum cigar
94 × 20 × 24 mm, 100 g: the FA-1 slips into an existing link without clutter, machined from solid aluminum to dissipate heat and last.
94 × 20 × 24 mm · 100 g
Custom filters available
The four standard blocks cover 470–670 MHz in UHF. For specific bands (high VHF, upper UHF, narrow industrial bands), BSRF builds filters to spec.
4 blocks + custom
Specifications
The numbers that matter.
Condensed excerpt. See the datasheet for detailed conditions.
RF
Power & mechanical
Use cases
Dense RF environment
Clean up an HF reception polluted by 4G
Right at the antenna, the FA-1 cuts nearby cellular emissions before they contaminate the receiver. The noise floor drops, reception breathes.
Cable compensation
Recover 30 m of coaxial loss before a rack
A +12 dB FA-1 at the antenna output compensates for a long coax run (LMR, RG213) and restores nominal level at the splitter input without degrading noise.
Reliability engineering
Drop in a filter that never fails
Thanks to fail-safe, even if the FA-1 loses power, the filter stays active and signal keeps flowing. One link doing two jobs — one of which survives failure.
Documentation
Everything you need before buying.
Datasheets and user manuals available in PDF format.
Product range
Other BSRF instruments.
PM-1
PM-1 Broadband RF power meter, the Swiss knife of RF. Check easily your coaxial cables and your transmitters. Measure attenuation of coaxial cables, test RF power of your transmitters in the 10MHz-1000MHz range. Simple and accurate it will be the…
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NS-1
The NS-1 is white noise generator in the 100-1500MHz range, powered through DC feed. The NS-1 allows to do a quick test of a RF channel. Connect it at the antenna side, power it through with DC feed and then run a scan on your receiver. You'll be…
Quote on request
ADH-400
ADH-400 Duplex Station (TX: 2 coax, 2 fibers/ RX: 1 coax, 2 fibers) ADH-400 is an hybrid duplex station allowing both transmission and reception signals carriage through fiber optics, it also features direct coax input and output. ADH-400 perfectly…
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Need a specific band?
Standard blocks 470–670 MHz, custom at order.