AM frequency help with rtl-sdr USB

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alyousufi
Posts: 10
Joined: Wed Dec 18, 2019 8:54 pm

AM frequency help with rtl-sdr USB

Post by alyousufi » Wed Dec 18, 2019 9:05 pm

Hi guys I bought before few days Docooler Andoer DVB T SDR from this link in Amazon

https://www.amazon.es/dp/B013Q94CT6/ref ... E_SCE_dp_2

I want to hear AM frequency Airband but unfortunately I can't only fm radio

Is there any way to hear airband frequency with this type of dongle.

aurgathor
Posts: 103
Joined: Wed Apr 25, 2018 8:14 am

Re: AM frequency help with rtl-sdr USB

Post by aurgathor » Wed Dec 18, 2019 11:53 pm

Cheap dongles usually don't have the:
Experimental: HF Direct Sampling Mode - Listen to 500 kHz - 24 MHz with direct sampling. Simply connect an HF antenna to the SMA port, and choose the Q-branch mode. There is a built in 25 MHz low pass filter, but additional HF filters may be required for optimal performance (e.g. to attenuate strong MW AM).
You either need an upconverter, a real RTL-SDR Blog V3 SDR, or any other SDR that has HF Direct Sampling Mode. In either case, you also need a suitable antenna, or antenna substitute. (like 75 m of wire :lol: )

alyousufi
Posts: 10
Joined: Wed Dec 18, 2019 8:54 pm

Re: AM frequency help with rtl-sdr USB

Post by alyousufi » Thu Dec 19, 2019 1:52 am

Thank you for your respond
What do you think about this one it's suppor HF, but not sure if I will work to listen for AM frequency specialy ATC comm

https://rover.ebay.com/rover/0/0/0?mpre ... 2825262550

aurgathor
Posts: 103
Joined: Wed Apr 25, 2018 8:14 am

Re: AM frequency help with rtl-sdr USB

Post by aurgathor » Thu Dec 19, 2019 5:28 am

That's a fake, so it may not have the AM band.

Read this: viewtopic.php?f=5&t=4169
and this: https://www.rtl-sdr.com/buy-rtl-sdr-dvb-t-dongles/

alyousufi
Posts: 10
Joined: Wed Dec 18, 2019 8:54 pm

Re: AM frequency help with rtl-sdr USB

Post by alyousufi » Thu Dec 19, 2019 8:40 am

Thank you I will have I look into the topic.

K3RLD
Posts: 31
Joined: Sun Sep 01, 2019 12:43 am

Re: AM frequency help with rtl-sdr USB

Post by K3RLD » Thu Dec 19, 2019 8:22 pm

The lowest frequency in air band is like 100 MHz, why would he need direct sampling?

OP: What software are you using? Software such as SDR#, GQRX, HDSDR, etc. can all demodulate airband AM, and no direct sampling is required. Just plug in the dongle, hook up just about ANY antenna, and fire up the software.

qrp
Posts: 44
Joined: Wed May 22, 2019 11:16 pm

Re: AM frequency help with rtl-sdr USB

Post by qrp » Fri Dec 20, 2019 9:39 am

you can listen aircraft AM band (118–136.975 MHz) with any RTLSDR dongle. There is NO needs up/down converter for that. You can do it with RTLSDR, but the signal is weak, so you're needs good antenna and may be bandpass filter and LNA

alyousufi
Posts: 10
Joined: Wed Dec 18, 2019 8:54 pm

Re: AM frequency help with rtl-sdr USB

Post by alyousufi » Fri Dec 20, 2019 11:09 am

Very good I have this type of usb dongle DVB-T-FM-DAB , 820T2&SDR
I can listen only to FM radio channel and for the Aircraft I cannot the airport is next to me 1nm.
So I think I have to buy a new antenna any recommendations please?

K3RLD
Posts: 31
Joined: Sun Sep 01, 2019 12:43 am

Re: AM frequency help with rtl-sdr USB

Post by K3RLD » Fri Dec 20, 2019 12:30 pm

What software are you using? I can pick up air band on my RTL-SDR.com V3 dongle using GQRX software and only the supplied cheap telescoping magnetic base antenna. If you are right next to an airport, you should be able to hear airband.

alyousufi
Posts: 10
Joined: Wed Dec 18, 2019 8:54 pm

Re: AM frequency help with rtl-sdr USB

Post by alyousufi » Fri Dec 20, 2019 12:47 pm

I used only one software SDR# and i can not hear anything in AM frequency.
I have RTL sdr not V3 I think mine is V2 check the attached photo for my sdr. I will try to use the another software you mention
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