Search found 17 matches

by JMG
Wed Sep 07, 2016 10:47 am
Forum: SDR Antennas
Topic: Antenna mystery : UHF/VHF antenna better than longwire ?!
Replies: 4
Views: 3692

Re: Antenna mystery : UHF/VHF antenna better than longwire ?!

No myth.... At HF a well matched antenna will receive a noise level which is up to 50dB (!) above the noise level of the receiver. This may load the SDR receiver (having a limited daynamic range) to its limits. Less is more! The antenna will be good enough if the noise floor of the receiver will ris...
by JMG
Tue May 24, 2016 9:15 pm
Forum: General
Topic: RSP RFI
Replies: 8
Views: 3510

RSP RFI

Numerous articles and YouTube videos have been published on how to deal with RFI issues. Most proposals end up proposing creative shielding designs or by asking for a metallic casing. With limited reliable results. RF interference manifests itself as a higher noise floor and as spurious signals. To ...
by JMG
Wed Dec 30, 2015 1:59 pm
Forum: SDRplay related
Topic: Dimensions of new case
Replies: 8
Views: 5002

Re: Dimensions of new case

That is absolutely correct. I put the receiver to an EMC test range. At both the test frequencies of 1MHz and 150MHz a shielded case did not improve the interference susceptibility at all. The antenna cable on the one side and the USB cable on the other side are part of a dipole. The induced voltage...
by JMG
Sat Apr 18, 2015 9:18 am
Forum: SDRplay related
Topic: Frequencies stability
Replies: 2
Views: 2041

Re: Frequencies stability

When new my unit had a frequency offset of -5ppm. Aging of the crystal during the first couple of weeks brought it down to -8ppm. The capacitors of the XO have been adjusted then giving a stability of +/-1ppm (+/-450Hz at 450MHz) now. So, no complaints.

John
by JMG
Wed Apr 01, 2015 10:51 am
Forum: SDRplay related
Topic: Using SDR# to drive the SDRplay RSP
Replies: 53
Views: 24729

Re: Using SDR# to drive the SDRplay RSP

CaptainNemo wrote:Hi JMG
I got 02.f
I suppose 02.g is newer ...
Where can I get it?
TNX
73


You can get it from "qsl.net".
by JMG
Thu Mar 26, 2015 10:21 pm
Forum: SDRplay related
Topic: Using SDR# to drive the SDRplay RSP
Replies: 53
Views: 24729

Re: Using SDR# to drive the SDRplay RSP

Using SDRplay SDR# plugin to drive SDRplay under SDRSharper.

SDRSharper and SDRplay RSP: a very harmonic combination!

In order to install SDRplay-SDRSharp-Plugin-v1.5.exe to SDRSharper-02g,
SDRSharper.exe
SDRSharper.exe.config
have to be renamed to
SDRSharp.exe
SDRSarp.exe.config
by JMG
Thu Mar 26, 2015 10:01 pm
Forum: SDRplay related
Topic: Using SDR# to drive the SDRplay RSP
Replies: 53
Views: 24729

Re: Using SDR# to drive the SDRplay RSP

Works great. Some real improvements. Thanks.

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