Search found 9 matches

by NK7Z
Sat Feb 18, 2017 1:32 pm
Forum: SDRplay related
Topic: Proposed upgrades to RSP1 no cancelled ??
Replies: 14
Views: 7916

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: 4019

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: 4019

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: 6040

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: 4019

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.
by NK7Z
Sat Sep 10, 2016 10:30 pm
Forum: SDR Antennas
Topic: Antenna mystery : UHF/VHF antenna better than longwire ?!
Replies: 4
Views: 3720

Re: Antenna mystery : UHF/VHF antenna better than longwire ?!

Sebastien, Clearly you would not want to kill the LNA if you are using a smaller window mounted antenna shown in your link. I assumed you were using a long wire as you stated... Your response left off the long wire you mentioned, so you probably would want to keep the LNA on in that case. My answer ...
by NK7Z
Wed Sep 07, 2016 7:33 pm
Forum: SDR Antennas
Topic: Antenna mystery : UHF/VHF antenna better than longwire ?!
Replies: 4
Views: 3720

Re: Antenna mystery : UHF/VHF antenna better than longwire ?!

Kill the AGC, turn down the gain, and kill the LNA. I am getting really good results using a 90 foot TTFD as the recieve antenna and an SDRPlay.

See:
http://nk7z.net/sdr-for-rfi-survey-p1/
for more on this...
by NK7Z
Fri Sep 02, 2016 1:18 pm
Forum: SDRuno
Topic: SDRUno
Replies: 15
Views: 4533

Re: SDRUno

I humbly ask only two things. A manual control for the preset bandwidths for WFM/SFM, and improve the selectivity of the input signals that manages SDRUno. And congratulations for the work you are doing. "Slowly but surely". Best regards. I would like to add one more thing... Please add a...

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