Search found 40 matches

by franko
Mon Jan 14, 2019 8:44 pm
Forum: General
Topic: Transmit-receive switches
Replies: 1
Views: 81

Transmit-receive switches

The adjacent thread "MFJ-1708B-T/R Switch Experiences" reminded me of a question I wanted to ask, but I thought it might be clearest to post a new thread rather than tag on to that one. Currently I have two SDRplay RSPduo units running continuously, each attached to its own magnetic loop a...
by franko
Sat Jan 12, 2019 7:53 pm
Forum: SDR Antennas
Topic: Loop antenna for SDR question
Replies: 5
Views: 1771

Re: Loop antenna for SDR question

Sorry for chiming in on the late side, but I have a Wellbrook ALA1530LNP loop antenna as well as a W6LVP loop. I've done a fair amount of side-by-side comparison with each connected to a separate SDRplay RSPduo, with them running simultaneously and monitoring the same HF FT8 band. Because of a stron...
by franko
Sun Nov 18, 2018 8:05 pm
Forum: SDRplay related
Topic: Safe distance between RSPduos and a low-power WSPR transmitter?
Replies: 2
Views: 1012

Re: Safe distance between RSPduos and a low-power WSPR transmitter?

Thanks, Roger. From the documentation it appears that the WSPR transmitter's power output can be set at custom levels using the configuration software -- I'll check that out further. Regarding RF limiters, I saw the following item mentioned here or in one of the other SDRplay discussion sites a few ...
by franko
Sat Nov 17, 2018 8:36 pm
Forum: SDRplay related
Topic: Safe distance between RSPduos and a low-power WSPR transmitter?
Replies: 2
Views: 1012

Safe distance between RSPduos and a low-power WSPR transmitter?

I have two RSPduo's with several virtual receivers each running 24/7 to monitor a number of HF FT8 bands. One is connected to a Wellbrook ALA1530LNP magnetic loop antenna, the other to a W6LVP magnetic loop antenna. Later today I'll be receiving one of these WSPR transmitters: https://www.zachtek.co...
by franko
Tue Oct 23, 2018 4:59 pm
Forum: SDRuno
Topic: Why are these SDRUno instances performing so differently?
Replies: 9
Views: 2236

Re: Why are these SDRUno instances performing so differently?

Hi Roger, this sounds a little like the diversity mode offered in some transceivers, where the radio makes use of two separate antennas to increase its ability to pull weak signals out of noise. I wonder if there is (or will ever be) a way to do that in SDRUno or other software making use of more th...
by franko
Tue Oct 23, 2018 4:49 am
Forum: SDRuno
Topic: Why are these SDRUno instances performing so differently?
Replies: 9
Views: 2236

Re: Why are these SDRUno instances performing so differently?

Thanks much for the explanations -- they are very clear. My objective is, first, to test RSPduo's against each other to ensure that there is no significant difference in their performance, and then use them to compare different antennas on a given band in real-time. This information will help enable...
by franko
Mon Oct 22, 2018 10:13 pm
Forum: SDRuno
Topic: Why are these SDRUno instances performing so differently?
Replies: 9
Views: 2236

Re: Why are these SDRUno instances performing so differently?

Hmm, well, I seem to have my issue basically resolved now, though I'm not sure exactly what the cause was, or what fixed it. When I changed the sample rate to 2 MHz and clicked to display the SP1 windows, I noticed that the LO was somewhat different in one instance, so I sync'd them up. Now the two ...
by franko
Mon Oct 22, 2018 12:07 am
Forum: SDRuno
Topic: Why are these SDRUno instances performing so differently?
Replies: 9
Views: 2236

Re: Why are these SDRUno instances performing so differently?

Okay, I have my hard disk issue resolved, and am ready to resume working on the question I posted about. I gather that proceeding with Main > Opt > Reset to Default Settings will return SDRUno to its factory defaults. I'm reluctant to do this at this point, because there may be settings in the curre...
by franko
Wed Oct 17, 2018 2:39 pm
Forum: SDRuno
Topic: Why are these SDRUno instances performing so differently?
Replies: 9
Views: 2236

Re: Why are these SDRUno instances performing so differently?

Thanks for the suggestions. As an unrelated issue, one of the two hard drives in the PC's RAID array appears to be gradually failing, so I'm leaving the computer off for a couple of days until a replacement drive arrives. By the weekend I'll probably be ready to resume working with SDRUno, and will ...
by franko
Tue Oct 16, 2018 9:47 pm
Forum: SDRuno
Topic: Why are these SDRUno instances performing so differently?
Replies: 9
Views: 2236

Why are these SDRUno instances performing so differently?

I'm scratching my head over results I got when testing a couple of RSPduo units today, and would be interested in any ideas. I have two RSPduo's (call them units A1 and A2) both connected to the same Windows 7 PC. Antenna port 2 of each RSP is connected via SMA cable to one of the two outputs of a M...

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