RTL-SDR.com Broadcast AM Block High Pass Filter Now for Sale

Back in October we released a broadcast FM bandstop filter for removing strong signals in the 88 – 108 MHz region. Today we’re releasing a new broadcast AM high pass filter (BCAM HPF) with a 2.6 MHz cutoff. The cost is the same as the BCFM bandstop filter at $14.95 USD including free international air shipping. Faster shipping options may also be chosen if desired. We’ll eventually have this product on Amazon USA in a few months too, but for now it is only available from our Chinese warehouse.

The filter comes in a 2.8 cm x 2.8 cm x 1.3 cm aluminum enclosure and uses female SMA connectors on each end. Included in the package is also a SMA male to SMA male straight barrel adapter.

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The Broadcast AM High Pass Filter
The Broadcast AM High Pass Filter

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:

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

Insertion Losses
Insertion Losses
Return Loss
V3 Direct Sampling no Filter
V3 Direct Sampling with BCAM HPF
Insertion Losses Insertion Losses Return Loss V3 Direct Sampling no Filter V3 Direct Sampling with BCAM HPF

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 compare 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.

RTL-SDR.com V3 Direct Sampling with HPF Demonstration

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Ash Nallawalla VK3BT

It works beautifully here. I had strong MW stations that overwhelmed my Wellbrook loop and made my Malahit DSP2 almost unusable until I connected one of these.



He comprado este filtro, anteriormente ya compre el de FM, mi duda es, ¿hay una forma especifica de conectar estos filtros?, es decir, ¿tienen diferenciadas la entrada y la salida?



I bought this filter, previously I already bought the FM one, my question is, is there a specific way to connect these filters ?, that is, do the input and the output have differentiated?


hi all,

rtl-sdr v3 with upconverter, txco does not work right .. disappointment.
But in direct sampling txco works very well, but I have a lot of oveload stations between 4700mhz to 5200mhz and between 5900 and 6200mhz, within the range of ham radio. Many stations mirrored between 3500 to 3800mhz that really hurt my websdr.
I do not have it overload with broadcast between 500khz and 1800mhz. My antenna is an 84 meter loop. Any suggestions?
Sorry for my bad English.
py4aaz Ricardo from Brazil

Enrique Martin Scheuer

I am working already for 4 months with FM RTL-SDR NO STOP Filter ALSO on TX up to 20 W with no heating or efficiency losses;
I have now purchased the AM Pass Band Filter to make the same tests; I have 18 FM and AM High Power towers in 2 miles radius. I will later report 73 Enrique PU2PSP


Injected noise and measured average output of filter, terminated to 50Ohm resistive load.

-7MHz abt 5dB loss compared to terminated output of generator,
-14MHz abt 6dB loss,
-21MHz abt 9dB loss and
-28MHz abt 10dB loss.

Source used was a Rigol AWG and measurement device a PicoScope digital oscilloscope.
Any comments?

73 de SV1CDN, Dennis!

Dionisis Drakopoulos

No VNA, but I shall measure with simple sine waves input on respective frequencies of interest.
Share the results when ready.


Dionisis Drakopoulos

I am calculating insertion loss.

Dionisis Drakopoulos

Filter works fine business, as advertised!
Root cause for the off measurements I had was a faulty probe.

Keep up the good work!
Thank you for the professional level of support.



I have an SDRPlay RSP2 which is very badly affected by a 5,000 watt AM broadcast station, only 2 miles from me, which kills shortwave reception with images and spurs. I highly recommend this video which demonstrates the amazing effectiveness of the FM filter, and the second half of the same video, which demonstrates the excellent effectiveness of the AM filter.

Well done — I just ordered one!!


Received the filter in about 10 days from China. Looks great. Very high quality. Absolutely killed the spurs/intermod from AM broadcast and both of the 5 kilowatt AM stations about 2 miles from me. The SDRplay RSP2 is like a new radio with the filter. No effect on FM broadcast, or SW broadcast bands, which is good, and no effect on the AIR, WX band, or 453 mHz police band. HIGHLY recommended!



I have an active RX antenna with a power feeder unit. How do you install this filter? Is it installed between antenna and power feeder? Or is it installed between power feeder and receiver?


Powered antenna have two choices for operation:
1. Radio w/ filters on> AM Filter > FM filter > Bias-T injector > Powered Antenna
2. Radio with Bias-T on > Antenna

Do not use the filter between the power source and the antenna, regardless of the power source.
I use method 1 with great success.
Method 2 with built in notch filters enabled still leaves me with massive internal reflections at every multiple of a AM stationfrequency but with additional reflections every 10khz. the same channel every 10khz. I really hate clear channel AM stations. I have one 18 miles from me @ 50,000 watts. I also have several FM stations at 23 miles distance that are 100kw. Method 1 above handles all of it.


What’s the insertion loss at higher frequencies? (10’s of MHz through GHz) Can you leave it in place without taking a major performance hit at higher frequencies?


Do you plan to make the full FM (62-74MHz OIRT, 76-100-108MHz CCIR) bandstop reject filter? In some countries are broadcast in both standards not only one, hope you make it someday!

gnar :3

have you guys ever thought of making like a switchable filterbank consisting of several LP&HP filters (for HF/SWL, could also be used for IF), or something like a combined bandstop filter for BCFM&Airband ATIS (130MHz HPF) and TETRA (for VHF/UHF)?


Thnak you for this new product.
I ordered one to blcok a strong AM broadcast near my home.
I already own the FM filter that gives good result too.
Like RF boy, now I’m waiting for the DAB 174–240 MHz band filter.


Well done. I also want to thank you for developing and rolling out amazing products for our community.



Thank you for all your work in this hobby. Your site, information and products are fantastic. I have been looking for an AM filter and here it is. Amazing price also. Thank you.


waiting for a DAB Band III 174-230MHZ Bandstop Filter for European User…. Any hope ?