RTL-SDR Blog Broadcast AM Block High Pass Filter

Ref: AM-Block-High-Pass-Filter

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Broadcast AM Block High Pass Filter

This filter was designed to eliminate broadcast band AM (BCAM) stations by attenuating (blocking) all signals below 1.7 MHz. In reality due to the roll-off the filter is usable from approximately 2.5 - 2 .6 MHz and above.
The AM broadcast band exists at approximately 525 kHz to 1,705 MHz. These signals are generally local and if you live near a transmitter they can sometimes be extremely strong. AM broadcast signals that are too strong can overload the SDR or radio, causing poor reception even in other HF bands. The filter also helps attenuate any other strong VLF/LF/MW interference. Note that this filter is a high pass and not a bandstop, so it also blocks VLF signals. Below are the specifications:

Filter Type: LC High Pass Filter
3 dB Cutoff: 2.5 - 2.6 MHz
Attenuation: ~60dB
IL Bandwidth: Typically well below 2 dB
Power Levels: RX power only, can't pass DC.

We have also uploaded a video below demonstrating reception when using an RT3-VDR3 dongle in Direct sampling mode together with the BCAM HPF. In the video we first compare reception with an upconverter (the Spyverter). It's worth nothing that the upconverter can receive signals even without the filter in place. Using the filter still helps the upconverter receive a little better, but the effect does not show up in the video. Then we simply scroll through the spectrum and listen to some signals.


This filter is designed to eliminate broadcast band AM (BCAM) stations by attenuating (blocking) any signals below 1.7 MHz. In reality due to roll-off the filter is usable from about 2.5 – 2.6 MHz and above.

The broadcast AM band exists at around 525 kHz to 1.705 MHz. These signals are usually local, and if you live close to a transmitter they can sometimes be extremely strong. Broadcast AM signals that are too strong can overload your SDR or radio, causing poor reception in other HF bands too. The filter also helps attenuate any other strong VLF/LF/MW interference. Note that this filter is a high pass and not a bandstop, so it will also block VLF signals. Specifications are shown below:

(see photo up)

We've also uploaded a video below that shows a demonstration of reception when using an RTL-SDR.com V3 dongle in direct sampling mode together with the BCAM HPF. In the video we first appear reception against an upconverter (the Spyverter). It's worth nothing that the upconverter can receive signals well even without the filter in place. Using the filter does still help the upconverter receive a little bit better but the effect is not shown in the video. Then we simply scroll through the spectrum and listen to a few signals.

Filter Type: LC High Pass Filter
3 dB Cutoff: 2.5 – 2.6 MHz
Attenuation: ~60dB
Pass band IL: Typically well below 2 dB
Power Levels: RX power only, cannot pass DC

AM-Block-High-Pass-Filter

Data sheet

Mpn
Broadcast AM Block HPF
Guy
Filtri notch
Compatible brand
Generico
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Filtri notch
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tutto ok
rating 5
molto veloci.
Valutazione tecnica Filtro RTL SDR AM
rating 5
ottimo filtro passa alto. Misurato con 2 VNA ( NanoVNA e MIniTiny VNA ) i valori di attenuazione e roll-off dichiarati risultano perfettamente coen le misure. Dal punto di vista pratico attenua perfettamente. L\'ho utilizzato per un forte disturbo EMI a 300 KHZ e le rispettive armoniche 600 e 1200 Khz e funzioan perfettamente abbattendo il disturbo.Quindi è versatile e non obbligatoriamente vincolato alle sovramodulazioni delle bradcasting AM. Attenua tutto quello che rientra nel suo range di attenuazione. Ne ho presi 2 perche titubante sul potere di attenuazione ma mi sonodovutoricredere perche con 2 collegati in cascata annulla anche il rumore difondo che in onde lunghe e medie è sempre presente per cui uno basta e avanza tenendo in considerazione che il mio disturbo a 300 khz aveva un\' ampiezza di -30dBm cioè notevole
Filtro veramente ottimo
rating 5
avevo un problema di un forte rumore EMI (proveniente da un contatore ENEL a 300 khz 600 khz e 1200 khz rispettivamente - 50 dBm - (sulle armoniche - 60 e - 80 dBm) ne ho presi 2 per maggiore sicurezza da collegarli in cascata .Uno da solo già è sufficiente, con 2 in cascata tutta la banda LW ed MW sono con rumore di fondo sui - 110 dbM. Ottimi , non solo per problemi con emittenti AM ma anche per utto ciò che disturba entro il range del filtro. Misurato con NanoVNa e MiniTiny VNA ha i il massimo dell'attenuazione a 50khz con - 56,7 dB poi si mantiene da 100khz fino a 1650 sui -50dB/ - 46dB a 1660 ha - 45db. poi l'attenuazione diminuisce progressivamente da -42 db a 1750 khz fino a -10db a 2ooo khz. Il roll off è veritiero a 2600 khz dove la porta S11 DUT dei VNA indica -22,64 dB ( la porta S21 DET indica -1.92 dB) poi fino a 3000 khz è più o meno lineare - 1.5/ - 1dB. Dati dichiarati effettivamente riscontrati. ottimi filtri

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