Search found 55 matches

by franko
Tue Oct 23, 2018 4:49 am
Forum: SDRuno
Topic: Why are these SDRUno instances performing so differently?
Replies: 9
Views: 3950

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: 3950

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: 3950

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: 3950

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: 3950

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...
by franko
Sun Sep 09, 2018 4:07 pm
Forum: General
Topic: Test to determine if receive damaged?
Replies: 7
Views: 3029

Re: Test to determine if receive damaged?

A simple test using an $12 noise generator and two home made attenuators is described here: https://www.sdrplay.com/community/viewtopic.php?f=5&t=3352 Great post, thanks for the link. I ordered one of the noise sources and will try this out when it arrives (probably in 2-3 weeks). What design did y...
by franko
Sun Sep 09, 2018 12:00 am
Forum: General
Topic: Test to determine if receive damaged?
Replies: 7
Views: 3029

Re: Test to determine if receive damaged?

Contact a 2-Way shop in your area, ask if they can use the service monitor they all have to test the rigs sensitivity. Thanks for the suggestion. Is there a more specific name for the service monitor equipment? I bought the RSP's from a Ham Radio Outlet, so I could ask them. Then again, it also occ...
by franko
Sat Sep 08, 2018 8:25 pm
Forum: General
Topic: Test to determine if receive damaged?
Replies: 7
Views: 3029

Test to determine if receive damaged?

I inadvertently left an SDRplay RSPduo running monitoring FT8 on 20m while transmitting on that band on a nearby rig. The RSPduo used a mag loop antenna about 37 feet (11 meters) away from the transmitting antenna, a Buddipole coil-loaded dipole. The transmitter used ~80 watts and transmitted for ab...
by franko
Sat Sep 01, 2018 1:42 pm
Forum: SDRplay related
Topic: Protecting RSP from nearby transmitter
Replies: 6
Views: 3343

Re: Protecting RSP from nearby transmitter

Thanks, Jukka -- that sounds very likely.
by franko
Sun Aug 26, 2018 11:21 pm
Forum: SDRplay related
Topic: Protecting RSP from nearby transmitter
Replies: 6
Views: 3343

Re: Protecting RSP from nearby transmitter

I just tried a test transmission to check this out. I had two RSPduo's connected to a Windows 7 PC with a total of six VRX's running to monitor the 80m, 40m, 30m, 20, 17m and 15m FT8 bands, along with an instance of WSJT-X for each one. The RSPduo's shared a 130-foot end-fed antenna through a Mini-C...