Search found 137 matches

by DaveB
Thu Dec 01, 2016 11:33 pm
Forum: SDRplay related
Topic: 2 MHZ low pass filter for MW and LW reception
Replies: 2
Views: 2096

2 MHZ low pass filter for MW and LW reception

Medium wave reception suffers break through from the LF shortwave bands. Based on an article found on the internet for a filter for LW radio I've built a filter for MW using cheap axial inductors and polyester capacitors. I've documented it in the link below and hope it will be useful. As a quick su...
by DaveB
Thu Dec 01, 2016 9:22 pm
Forum: General
Topic: zeor or low if
Replies: 2
Views: 2181

Re: zeor or low if

With zero IF you have the problem of mirror images of strong station on one side of the centre frequency showing up on the other side of the centre frequency. To minimise this the I/Q channels need to be very carefully balanced. Current version of the SDRPlay API have this built in under the Advance...
by DaveB
Thu Dec 01, 2016 10:53 am
Forum: SDRplay related
Topic: Blocks & Schematics?
Replies: 3
Views: 2706

Re: Blocks & Schematics?

Me three - especially the performance of the high selectivity filters and the isolation between the antenna inputs.
by DaveB
Sat Nov 26, 2016 5:59 pm
Forum: SDRplay related
Topic: Proposed upgrades to RSP1 no cancelled ??
Replies: 14
Views: 11438

Re: Proposed upgrades to RSP1 no cancelled ??

OK - it seems 225-425 kHz is also of interest to quite a few people - hence why there is a published circuit.
by DaveB
Sat Nov 26, 2016 12:50 pm
Forum: New Users' experiences
Topic: install mayhem
Replies: 2
Views: 3751

Re: install mayhem

At least you haven't suffered the problem I've had with f-secure (not with RSP software). It has decided that setup.exe and install.exe are risky files and automatically deletes them. The reason they are risky is given as "they could make changes to your computer"! It was a nightmare worki...
by DaveB
Fri Nov 25, 2016 5:23 pm
Forum: SDRplay related
Topic: Proposed upgrades to RSP1 no cancelled ??
Replies: 14
Views: 11438

Re: Proposed upgrades to RSP1 no cancelled ??

225 to 425 is not really usable even with external bandpass filters fitted due to images. Keith You need a sharp low pass filter - cutting off just below the MW band. This might be of interest http://www.radiohobbyist.org/blog/?p=1894 add a couple of extra sections for even sharper attenuation. David
by DaveB
Fri Nov 25, 2016 5:11 pm
Forum: General
Topic: The new SDRPlay: RSP2
Replies: 15
Views: 13168

Re: The new SDRPlay: RSP2

I'm not happy with this news, last week I bought 3 units of the rsp1. If I had known there was a new receiver, I would have waited a week to buy the new one


There is a 14 day money back guarantee - "if you are not happy for any reason"......
by DaveB
Sat Nov 19, 2016 10:04 pm
Forum: New Users' experiences
Topic: Impossible To Install
Replies: 10
Views: 8148

Re: Impossible To Install

Not directly relevant - but my AV software (F-secure through TalkTalk Homesafe) has recently decided to automatically block "setup.exe" and "install.exe". Actually it didn't block them it "helpfully" deleted the file(s) as they were flagged as potentially harmful as the...
by DaveB
Mon Nov 07, 2016 12:49 pm
Forum: SDRplay related
Topic: Ferrite and interference spikes?
Replies: 10
Views: 10279

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: 6489

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...

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