Search found 43 matches

by NK7Z
Sun Apr 22, 2018 3:10 pm
Forum: General
Topic: Broadcast Stations overloading front end
Replies: 1
Views: 1298

Re: Broadcast Stations overloading front end

I live about 3 miles from a 50 KW AM station, used to cause issues with my RSP-1, bought a BCB filter off ebay, the little black ones, and had no more issues... I have several spectrograms of the entire 80 meter, 40 Meter, 30 Meter, etc., bands shown in an article on using an SDR to inventory the RF...
by NK7Z
Thu Apr 05, 2018 12:17 pm
Forum: SDR Antennas
Topic: First setup VHF 118-160 MHz
Replies: 3
Views: 3876

Re: First setup VHF 118-160 MHz

I would certainly give that a try to start with... If you are 9 miles from where you want to receive, you should have no issues at all, assuming the feedline and antenna are still functioning. Polarization might be an issue.
by NK7Z
Mon Feb 26, 2018 1:02 pm
Forum: General
Topic: RFI
Replies: 6
Views: 4074

Re: RFI

If you are interested in what various RFI sources look like on an RSP-1 I have a catalog of them I am starting at: https://www.nk7z.net/rfi-snapshots/ It is broken down by category of RFI. An SDRPlay RSP-1 was used for all the black and white images. There are also several other articles referenced,...
by NK7Z
Sun Jan 21, 2018 2:57 pm
Forum: General
Topic: RFI Signatures via SDR
Replies: 0
Views: 1592

RFI Signatures via SDR

Hello, I have created a page of RFI snapshots, as captured by SDR. The images were taken by various people, using various equipment, of any number of RFI sources, all of which have been identified. While this is not a fingerprint, it can help you in deciding what you are looking for with regards to ...
by NK7Z
Sat Feb 18, 2017 1:32 pm
Forum: SDRplay related
Topic: Proposed upgrades to RSP1 no cancelled ??
Replies: 14
Views: 16870

Re: Proposed upgrades to RSP1 no cancelled ??

Same here... As a less than one year owner, a return program would be nice...
by NK7Z
Wed Jan 18, 2017 5:00 am
Forum: General
Topic: Frequency Sweeps? What? Who?
Replies: 13
Views: 11861

Re: Frequency Sweeps? What? Who?

I manage the Dopplergrams group on Yahoo, Peter also lives there, he is a bottomless put of information... The man is amazing.
by NK7Z
Tue Jan 17, 2017 3:12 am
Forum: General
Topic: Frequency Sweeps? What? Who?
Replies: 13
Views: 11861

Re: Frequency Sweeps? What? Who?

Here is a thought experiment... Imagine you are listening to WWV, now imagine I live next door and am running an ionosonde at 1 watt. From your viewpoint, you would see the same behaviour, sweep swamping WWV. Unless you have all data, you can not infer anything about output power of one station from...
by NK7Z
Mon Jan 16, 2017 4:30 pm
Forum: SDR Antennas
Topic: Wideband low noise antenna possibility
Replies: 2
Views: 8784

Re: Wideband low noise antenna possibility

Hi, I use a T2FD antenna, and have some actual results from it you can look at here: http://nk7z.net/sdr-rfi-survey-p1/ This is a short article on using an SDR as a RFI survey tool. Almost every spectrogram shown was taken using a BWD-90, T2FD. It is wide band, and about 6 db down from a dipole... I...
by NK7Z
Mon Jan 16, 2017 2:05 pm
Forum: General
Topic: Frequency Sweeps? What? Who?
Replies: 13
Views: 11861

Re: Frequency Sweeps? What? Who?

They typically use around 100 watts, not much power, and if you look at the scans, you will see some of them bypass the ham bands. The info is so useful, that no one really worries about the QRM.