I'm new here. I just ordered a dc-4.3ghz rlc l-1032 filter to see how that works...they have lna's like this used--on ebay, FYI. On Apr 18, 2016 10:12, "O.T. Powell" <[email protected]> wrote:
> >> Thank you both for the great responses. I have a 1090 ADS-B bandpass >> filter as well as an LNA. I am looking into buying an adjustable bandpass >> filter, or I'm sure I can make an RLC circuit that serves the same >> purpose. As for an external amplifier, is the LNA the same thing? Does it >> amplify transmitted signals as well? I am using SDR# right now, but I'm >> also going to try Skywave Linux and the SDR package in Kali Linux. I >> already have them setup I just have to plug in my HackRF and start testing. >> > > In regard to the full metal shield, I just bought the HackRF shield from > NooElec. Is this what you are talking about? I am going to install that > this week. I also have an aluminum box coming, but was not planning on > putting my hackRF in the aluminum box because I read that if you have the > shield, adding the aluminum box does not add any extra shielding. Do you > guys think that information is accurate? Should I add the sheild and then > enclose the whole thing in an aluminum box? > > Can you reccommend any bandpass filters or external amplifiers that aren't > too expensive? > > I'm not sure what my sample rate or bandwidth is. I guess I'd want the > largest bandwidth which is 20MHz. Sample rate, I usually go up as high as > I can while having everything run smoothly. > > Thanks guys for being patient, I'm still learning. Most of you sound like > RF guru's. lol. > > > > > > >> >> >> Today's Topics: >> >> 1. Re: HackRF-dev Digest, Vol 42, Issue 10 (Cinaed Simson) >> >> >> >> From: Cinaed Simson <[email protected]> >> To: [email protected] >> >> >> On 04/15/2016 06:15 AM, McDonald, J Douglas wrote: >> > >> > In my opinion the HackRF receive is fairly poor because of the >> conflation >> > of two things: >> > >> > only 8 bits >> > >> > inadequately steep frequency skirt filters >> > >> >> The HackRF doesn't have a front-end. Either buy a band pass filter or >> construct one using gnuradio. >> >> It's highly recommend to use an external band pass filter with an >> external amplifier. >> >> Also, you didn't indicate which software package you were using - the >> bandwidth or sampling rate. >> >> > This means there are spurious responses all over the place. >> > These are really really a nuisance. >> > >> > Also, the connections to the box are not well done: any serious RF >> device needs >> > a full metal shield with all connections bonded to the box, not sticking >> > through holes. >> >> See Michael Ossmann's tutorial on the HackRF >> >> https://greatscottgadgets.com/sdr/ >> >> > >> > On the short wave bands I can get a usable signal from my amplified >> > outside antenna by touching the shield of the RG6 coax to the input >> connector, >> > and the actual differential mode signal (center conductor versus >> shield) does not >> > fully swamp that. >> >> Isn't RG6 75 ohm cable? The HackRF unlike the RTL-SDR dongle is a 50 ohm >> device. It's not a big deal provided you already have a good impedance >> match with the antenna. If you reflect roughly 10 mW of power back at >> the HackRF, you'll smoke the RF amplifier on the HackRF - see the link >> above. >> >> Regarding the antenna problem, did you try a different antenna - >> preferably one which sees the same ground as your computer? >> >> In any case, nothing you described above has anything to do with the 8 >> bit ADC. >> > > > -- > *O.T. Timothy PowellEE Engineering TechM: 386.299.6991 > <386.299.6991>[email protected]* > > _______________________________________________ > HackRF-dev mailing list > [email protected] > https://pairlist9.pair.net/mailman/listinfo/hackrf-dev > >
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