Search found 241 matches

by g1hbe
Sun Jan 10, 2016 11:09 am
Forum: New Users' experiences
Topic: Learning to use SDRplay for Inmarsat
Replies: 12
Views: 9514

Re: Learning to use SDRplay for Inmarsat

So far I haven't even attempted any decoding, as my time is at a premium atm. I'm currently trying to rescue a water-logged loop antenna so I can get back on 160m.
by g1hbe
Sat Jan 09, 2016 4:24 pm
Forum: New Users' experiences
Topic: Learning to use SDRplay for Inmarsat
Replies: 12
Views: 9514

Re: Learning to use SDRplay for Inmarsat

Hi. Yup, bricks and mortar, over 100 years old and still standing. I tried the setup outside to see if the signals got any stronger, but from ground level (my radio shack is upstairs) the path is obstructed by more bricks and mortar (that's next door's house!).
by g1hbe
Sat Jan 09, 2016 10:56 am
Forum: New Users' experiences
Topic: Learning to use SDRplay for Inmarsat
Replies: 12
Views: 9514

Re: Learning to use SDRplay for Inmarsat

Scott, I've had similar experiences. I started with an active patch antenna and later moved to a home-made yagi with the patch as the driven element which worked great, but I noticed that the signals were always several dB stronger if I beamed through the brick wall instead of the window. I then rem...
by g1hbe
Thu Dec 17, 2015 9:22 am
Forum: SDRplay related
Topic: New features requests
Replies: 24
Views: 9072

Re: New features requests

I can't say I've noticed any particular weakness at 400 MHz. Mine shows a slight dip there (a few dB) but that may be my homebrew antenna diplexer. Of more concern is the oddness that starts around 255 MHz. I can't remember where it stops, but the RSP performs poorly in this area. It may be image re...
by g1hbe
Fri Nov 20, 2015 9:46 am
Forum: SDR Antennas
Topic: Magnetic Loop Antenna with SDRPlay
Replies: 9
Views: 10360

Re: Magnetic Loop Antenna with SDRPlay

Loops are a fantastic solution to local noise. I use the Wellbrook loop (ALA1530) and it has saved my bacon. Any attempt to use my vertical wire on RX just gives me S9 of noise on the lower bands, but the loop just ignores it. I can now operate on 160m again - vertical wire on TX, loop on RX. Bliss!
by g1hbe
Sun Nov 08, 2015 10:18 am
Forum: SDR Antennas
Topic: 50 ohm antenna connector on the SDRplay
Replies: 3
Views: 3792

Re: 50 ohm antenna connector on the SDRplay

It really doesn't matter either way. I'm not sure what the nominal input impedance of the SDR play is anyway, but it sure won't be constant over the bands. And the effect of the connector's impedance will be so tiny you can ignore it.
by g1hbe
Tue Oct 27, 2015 11:58 pm
Forum: General
Topic: Lowest frequency
Replies: 17
Views: 8513

Re: Lowest frequency

Hi Joerg. I find nothing beats my Wellbrook 1530 loop for S/N at low frequencies. All my wires and verticals return lots of local domestic noise here. Only the loop cuts through it. I find the Wellbrook works well down to about 40 KHz at least. It's mounted on a cheap rotator at gutter height. I'm n...
by g1hbe
Wed Oct 07, 2015 9:32 pm
Forum: SDRplay related
Topic: Spurious signals at low gain
Replies: 7
Views: 3225

Re: Spurious signals at low gain

Yes, I see these as well and only at low gain settings. The 'humps' are slightly unstable in frequency as if they might be spurious oscillations or maybee very high harmonics of a clock frequency or something. It would be great to find out what they are!
by g1hbe
Wed Oct 07, 2015 11:01 am
Forum: New Users' experiences
Topic: Grumbly audio with 0 IF but ok with offset IF.
Replies: 2
Views: 1973

Re: Grumbly audio with 0 IF but ok with offset IF.

Sounds strange. Are you sure your PC is up to the job? Try reducing the span to something like 1.5 MHz or 600 KHz and see if it clears up. The only other thing that springs to mind is that you may be listening to a transmission that you have positioned on top of the central DC spike. Clutching at st...
by g1hbe
Sat Oct 03, 2015 9:52 pm
Forum: General
Topic: getting started with sdrplay rsp1 unit is deaf
Replies: 1
Views: 1346

Re: getting started with sdrplay rsp1 unit is deaf

Have you downloaded the EXTIO and put it in the correct directory? Without this the show won't start.

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