Search found 198 matches

by DanubeBCL
Sat Feb 16, 2019 8:06 am
Forum: SDR Antennas
Topic: RA0SMS vs PA0RDT Active Mini Whip - RA0SMS is Very Noisy - Why?
Replies: 19
Views: 1484

Re: RA0SMS vs PA0RDT Active Mini Whip - RA0SMS is Very Noisy - Why?

So if you put it on metal pole the pole acts as an common-mode-choke and the "antenna" stops working. That's not true. Active monopoles work fine both on top of metal masts and non-conductive masts. because the coax cable is part of the antenna. This is true. That's why an active monopole...
by DanubeBCL
Wed Jan 30, 2019 8:00 am
Forum: SDR Antennas
Topic: Intefearance reducing/anti jamming antenna
Replies: 4
Views: 778

Re: Intefearance reducing/anti jamming antenna

I use two antennas, one is a loop the other is a wire for picking up noise. The signals from both are combined in a control unit in the shack and the amplitude and phase are adjusted to null out the noise. That's the only way to get rid of at least partly the RF noise polluting our environments tod...
by DanubeBCL
Sat Jan 26, 2019 4:31 pm
Forum: General
Topic: Chinese copies now on eBay?
Replies: 5
Views: 2676

Re: Chinese copies now on eBay?

Funny:
The Chinese text says 100 kHz-2 GHz.
The English text below: 1 KHZ-2GHZ.
The label on the box: 10 kHz-2GHz
They don't know themselves what they sell.
What should "FE" be? (SDR-FE-PLAY). Far East Play? :lol:
More precise: An RTL-SDR(!) Far East Receiver. :roll:

73, Heinrich
by DanubeBCL
Fri Nov 09, 2018 4:33 pm
Forum: SDRplay related
Topic: Bias-t voltage
Replies: 5
Views: 2041

Re: Bias-t voltage

PD1ET wrote:A voltage of 9 to 12 v would be more usefull...
And certainly more difficult and costly to be generated from a 5 V USB voltage.
73, Heinrich
by DanubeBCL
Fri Nov 02, 2018 11:36 am
Forum: SDRuno
Topic: SAM MODE "ANOMALY"
Replies: 4
Views: 1939

Re: SAM MODE "ANOMALY"

Shannon Volmet uses USB. This mode has no carrier which Sync AM could lock to. When you use SAM for SSB transmissions the detector will lock to any strong peak in the modulation spectrum close to the nominal frequency at random. This results in an unstable audio pitch. SAM is meant for AM transmissi...
by DanubeBCL
Wed Sep 05, 2018 2:44 pm
Forum: SDRplay related
Topic: Beam steering and noise cancelling possible with RSPduo?
Replies: 7
Views: 3614

Re: Beam steering and noise cancelling possible with RSPduo?

I'm very much hoping this is possible soon Me, too. But development goes slowly. Simon Brown announced several months a go he was planning to introduce noise cancelling/phasing by diversity in SDRConsole. But nothing happened so far. These people live in an exclusive environment, they do not know w...
by DanubeBCL
Fri Aug 03, 2018 7:49 am
Forum: SDR Antennas
Topic: Mains noise
Replies: 13
Views: 8821

Re: Mains noise

The standard situation is type a) (noise radiated from mains wires in the houses that surround you). You can do nothing against that type of noise, because... ... the neighbours do not understand why they are the jammers. You cannot persuade them to switch off the noise sources or use line filtering...
by DanubeBCL
Thu Jul 05, 2018 7:35 am
Forum: SDR Antennas
Topic: magnetic loop and pre-amp?
Replies: 5
Views: 3537

Re: magnetic loop and pre-amp?

Tuned loops have a high resonant circuit impedance. How is your loop matched to the RSP input? Are you using a high impedance FET source follower or some other matching network?
73, Heinrich
by DanubeBCL
Sun Jun 10, 2018 4:26 pm
Forum: SDRuno
Topic: Perseus Userlist import
Replies: 2
Views: 1471

Re: Perseus Userlist import

1. Go to http://fmscan.org
2. Click Tools (userlist etc.)
3. Click Userlists for Perseus / ELAD / Winradio / Stationlist / SDR Console
4. Set your location
5. Click DOWNLOAD userlist1.txt (Perseus (EIBI format, strong stations last) chosen)

73s, Heinrich
by DanubeBCL
Sun Jun 10, 2018 11:54 am
Forum: SDRuno
Topic: Sett Menu: SAM mode settings
Replies: 5
Views: 1889

Re: Sett Menu: SAM mode settings

High pass frequency cutoff. Lower frequencies are suppressed in the audio playback. That is, you have more or less "bass" when e. g. listening to a music station. e. g. 50 Hz: for music, e. g. 300 Hz: for speech. This setting also works for AM and LSB, USB, not only for SAM. SAM/HP does no...

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