Search found 41 matches

by OH2BUA
Thu Jul 20, 2017 1:10 pm
Forum: SDR Antennas
Topic: RA0SMS active mini-whip power supply
Replies: 10
Views: 1735

Re: RA0SMS active mini-whip power supply

Hi,

is there possibly a difference between your power supplies in a way that one 'passes' the ground to the mini-whip power adaptor, and the other doesn't?

73, Jukka
by OH2BUA
Sun Jul 09, 2017 3:58 pm
Forum: SDRplay related
Topic: RSP2 LO 3rd harmonic spurious response only -20dBC
Replies: 17
Views: 2721

Re: RSP2 LO 3rd harmonic spurious response only -20dBC

Ok, here it is, in the middle. 2MHz low-pass filter. Plug-in version. Cute as a small pig, as we tend to say hereby.
2M_filter_verysmall.jpg
2M_filter_verysmall.jpg (196.59 KiB) Viewed 1157 times

73, Jukka
by OH2BUA
Wed Jul 05, 2017 3:25 pm
Forum: SDRplay related
Topic: RSP2 LO 3rd harmonic spurious response only -20dBC
Replies: 17
Views: 2721

Re: RSP2 LO 3rd harmonic spurious response only -20dBC

I hope that you are also getting a more educated answer - but the truth is, that if you connect a decent antenna into RSP2, during nighttime / good condix in MW band you will also be hearing a lot of signals which actually don't reside in MW band, but are from somewhere higher.

73, Jukka
by OH2BUA
Mon Jul 03, 2017 10:25 am
Forum: SDRplay related
Topic: RSP2 LO 3rd harmonic spurious response only -20dBC
Replies: 17
Views: 2721

Re: RSP2 LO 3rd harmonic spurious response only -20dBC

Thanks Andy for your tip for RFSim99.

It's easy to get learned and fun to play with.

Jukan_1.png
Jukan_1.png (6.99 KiB) Viewed 1320 times


73, Jukka
by OH2BUA
Fri Jun 30, 2017 7:47 am
Forum: SDRplay related
Topic: RSP2 LO 3rd harmonic spurious response only -20dBC
Replies: 17
Views: 2721

Re: RSP2 LO 3rd harmonic spurious response only -20dBC

Andy, as you seem to be experienced with external filtering, can you possibly recommend a solution for me: For listening MW and 160m I have a Double-KAZ antenna, with about 1 kohm impedance, symmetric. It's fed to the RSP2's Hi-Z port by using 12 meters of 450 ohms ladder line. I'd like to add an ex...
by OH2BUA
Thu Jun 29, 2017 1:30 pm
Forum: SDRplay related
Topic: RSP2 LO 3rd harmonic spurious response only -20dBC
Replies: 17
Views: 2721

Re: RSP2 LO 3rd harmonic spurious response only -20dBC

Hi, I have experienced the similar, but haven't taken such an analytical approach on that as you've done. Could you possibly share some more details, Sir? - Did I calculate right, that when you are tuned into let's say 1.8MHz (Zero IF), you are also receiving signals which actually are at around 7.2...
by OH2BUA
Thu Jun 22, 2017 6:09 am
Forum: SDR Antennas
Topic: MW-antenna directional during the nighttime, omnidirectional in the daytime
Replies: 0
Views: 774

MW-antenna directional during the nighttime, omnidirectional in the daytime

There exists several directional mediumwave receiving antenna concepts based on an idea that the directionality is optimized by 'tuning' an end-resistor for the best achievable Front-to-Back (F/B) ratio, and after that usually replacing it with an equivalent fixed resistor. For example Beverage, EWE...
by OH2BUA
Sun Jun 18, 2017 3:27 pm
Forum: SDRplay related
Topic: Serial Number issue! Please help!
Replies: 1
Views: 455

Re: Serial Number issue! Please help!

Hi,

you can find it in SDRuno: OPT/About.

73, Jukka oh2bua
by OH2BUA
Sun Jun 18, 2017 9:21 am
Forum: New Users' experiences
Topic: Automation/remote control?
Replies: 6
Views: 1304

Re: Automation/remote control?

Hi agn, to get RDP working you don't need to tamper the firewall in the local end, but in the remote end yes. - You need to allow incoming TCP and UDP traffic towards port 3389 (default). - And you need to map/route/pat/redirect (whichever term is used) that traffic to the particular remote host com...
by OH2BUA
Fri Jun 16, 2017 6:56 am
Forum: New Users' experiences
Topic: Automation/remote control?
Replies: 6
Views: 1304

Re: Automation/remote control?

Hi, interesting use case you have:) HDSDR can perform scheduled recordings nicely. I hope that some day also SDRuno will. I operate remote-only. Even if i'm at my summer cottage (my remote site), i need to operate "remotely", and i've also done that from 10 000 kilometers distances. For wi...

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