Search found 129 matches

by DaveB
Mon Nov 07, 2016 12:49 pm
Forum: SDRplay related
Topic: Ferrite and interference spikes?
Replies: 10
Views: 5811

Re: Ferrite and interference spikes?

My initial interest is trying to detect meteors by the reflections they give of signals from a VHF transmitter which is too far away for direct reception, and I'm trying the Graves transmitter on 143.050 MHz, which seems to be widely used for this purpose. No luck yet! If you want to detect meteors...
by DaveB
Thu Nov 03, 2016 11:11 pm
Forum: General
Topic: Would wrapping the unit in AlFoil tape help shield it?
Replies: 9
Views: 3347

Re: Would wrapping the unit in AlFoil tape help shield it?

But when the noise is caught by the antenna, nothing helps There is some form of solar powered lighting nearby which puts out around 30dB above the noise floor shortly after sunset As seen on the waterfall at thje bottom end of the FM broadcast band. I'm 99% sure it is solar powered and not just on...
by DaveB
Mon Oct 31, 2016 10:14 pm
Forum: SDRplay related
Topic: Signal mirrors all over the band.
Replies: 8
Views: 3014

Re: Signal mirrors all over the band.

In the SP Window click on the ADV button (just to left of the PLAY! button) and check whether the DC/IQ button has been unchecked (dark instead of white). This would be one cause of the mirror signal/DC spike symptoms you report. The centre spike would then cause distortions to centre frequency sign...
by DaveB
Mon Oct 17, 2016 7:34 pm
Forum: SDR Antennas
Topic: Where to get SMA Adapters that are 50 Ohm 2GHz? Do they exist?
Replies: 3
Views: 1746

Re: Where to get SMA Adapters that are 50 Ohm 2GHz? Do they exist?

cosycave.co.uk are worth looking at - how good they are a 2 GHz I wouldn't know.
by DaveB
Mon Oct 17, 2016 7:32 pm
Forum: General
Topic: Would wrapping the unit in AlFoil tape help shield it?
Replies: 9
Views: 3347

Re: Would wrapping the unit in AlFoil tape help shield it?

As F1BJB has done I wrapped my SDRPlay in aluminium foil the day I bought it - and it reduced interference on weak FM signals from the SDRPlay to nothing. I made sure the foil was grounded to the antenna connector - using a small cable tie to pull it tight - and made sure it was not connected to the...
by DaveB
Mon Oct 17, 2016 7:17 pm
Forum: SDR Antennas
Topic: Magnetic Loop Antenna with SDRPlay
Replies: 9
Views: 9283

Re: Magnetic Loop Antenna with SDRPlay

Couldn't a guy just use a 3 foot diameter loop of copper pipe and match the impedance to the SDRplay input with a balun of some description? Yes - I've tried it - it works. Not having any copper tube to hand I used a 10 ft length of RG6 U - fitted f-connectors at each end and used a barrel connecto...
by DaveB
Sat Oct 08, 2016 1:21 pm
Forum: SDRplay related
Topic: will upgrade to 12 bit sdrplay help me?
Replies: 5
Views: 1765

Re: will upgrade to 12 bit sdrplay help me?

I need to correct something in my previous post regarding the S/N ratio that can be achieved with an RTL dongle. I don't know why but running SDR# 1430 I've found that some of my local radio stations are showing S/N ratios up near the 60dB mark without the dongle completely overloading. There are pr...
by DaveB
Fri Oct 07, 2016 7:21 pm
Forum: SDRplay related
Topic: Multiple Bands on SDR Play
Replies: 17
Views: 4036

Re: Multiple Bands on SDR Play

No nvidia card - just the integrated video chip. I opted for a small footprint PC at the beginning of 2015 as in all the years I've had PCs I have only every upped the memory, I have never fitted an expansion card. The PC only has a single expansion slot and if I could squeeze a video card in I'm su...
by DaveB
Fri Oct 07, 2016 6:23 pm
Forum: SDRplay related
Topic: Multiple Bands on SDR Play
Replies: 17
Views: 4036

Re: Multiple Bands on SDR Play

I own a PC with an i5 4460 processor and 8 GB of RAM it cpu benchmark of 6598. With SDR-Console v3 preview I can run five VFO's across an 8 MHz spectrum window - with SDRPlay set to a 10 mbps (10MHz) sample rate. Using the Matrix option I can display all five. In my case I am in the FM broadcast ban...
by DaveB
Tue Oct 04, 2016 11:42 am
Forum: SDRplay related
Topic: will upgrade to 12 bit sdrplay help me?
Replies: 5
Views: 1765

Re: will upgrade to 12 bit sdrplay help me?

A difficult question to answer - but obviously FM stereo needs a far higher S/N ratio to become noise free. I'm currently listening, on headphones, to BBC R3 classical music in 250 kHz bandwidth. According to SDR# the s/n ratio is 54-55 dB and it is practically noise free. An alternative frequency g...

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