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by g1hbe
Fri Apr 21, 2017 7:56 pm
Forum: SDRuno
Topic: What's This Minor Audio Distortion From?
Replies: 1
Views: 1165

Re: What's This Minor Audio Distortion From?

I'd say that was a transmission fault, Noel. It seems to take the same form every time, so it's unlikely to be in your setup.
by g1hbe
Fri Apr 14, 2017 7:41 pm
Forum: SDRuno
Topic: New user question - please see my screenshot
Replies: 9
Views: 3719

Re: New user question - please see my screenshot

Stephen - you mention a longwire antenna connected to the Hi-z input. Is this a longwire *directly* into the RX? If so, I'm sure you know that these days bringing a high-impedance wire into your shack is a cast-iron way of picking up every bit of noise in your own house and your neighbours. A coax f...
by g1hbe
Thu Apr 13, 2017 11:13 pm
Forum: SDRuno
Topic: New user question - please see my screenshot
Replies: 9
Views: 3719

Re: New user question - please see my screenshot

Looks like you have a strong local source of interference, maybe from a switch-mode psu or a plasma TV. It may even be from your own home/shack. What antenna system are you using?
by g1hbe
Wed Apr 12, 2017 6:40 pm
Forum: General
Topic: Interference identification?
Replies: 37
Views: 16027

Re: Interference identification?

FCC caught with their pants down on the issue... https://smartmeterharm.org/2016/04/23/fcc-finds-power-line-communication-plc-can-reach-or-exceed-radiation-limits/ That's appalling, but any knowledgable SWL or Ham could have told these 'experts' that if you apply a significant amount of RF to a pie...
by g1hbe
Wed Apr 12, 2017 8:18 am
Forum: General
Topic: what can it be this huge interference.... ??
Replies: 7
Views: 3474

Re: what can it be this huge interference.... ??

It could be almost anything, from any kind of device that uses a switch-mode supply to a plasma TV. I see the spikes occur every 10 KHz, which seems a bit low for most switch mode supplies. If you have a radio which covers longwave you could go out and hunt it down, but be warned that low frequency ...
by g1hbe
Tue Apr 11, 2017 9:21 am
Forum: SDR Antennas
Topic: ALA1530 and Sdrplay2, connected to Hiz ?
Replies: 2
Views: 2800

Re: ALA1530 and Sdrplay2, connected to Hiz ?

You can use a balun if you want, but it works fine on the Hiz input without. I made an adaptor lead with an inline BNC socket leading to a short 'twisted pair' to connect to the Hi-z. Works just fine.
by g1hbe
Sun Apr 09, 2017 8:20 am
Forum: SDRuno
Topic: Recording & VHF Query
Replies: 2
Views: 1786

Re: Recording & VHF Query

The SRP's accept frequency entry as KHz. So if you enter 909 you will be taken to 909 KHz in the MW(AM) band. Typing in 5975 will put you on 5.975 MHz in the SW band. So from this you can see that to go to 101 MHz VHF you have to enter 101000. It'd be much better if there were MHz/KHz terminators.
by g1hbe
Sun Apr 09, 2017 8:15 am
Forum: General
Topic: HDSDR & SDRuno on one PC?
Replies: 4
Views: 2307

Re: HDSDR & SDRuno on one PC?

I have them both installed on my laptop and they both work fine with my RSP2.
by g1hbe
Wed Apr 05, 2017 10:23 pm
Forum: SDRplay related
Topic: Proposed upgrades to RSP1 no cancelled ??
Replies: 14
Views: 11375

Re: Proposed upgrades to RSP1 no cancelled ??

If you are into low-UHF milsat listening, the RSP1 and 2 may not be for you. The conversion architecture causes images from the low 200 MHz range to pop up in the ~250 MHz area. In the UK this is a problem, as we have strong DAB signals from about 215 to 225 MHz. Changing the conversion frequency ca...
by g1hbe
Fri Mar 31, 2017 11:00 pm
Forum: SDRuno
Topic: 75us de-emphasis for Broadcast AM
Replies: 1
Views: 1514

Re: 75us de-emphasis for Broadcast AM

Have you tried the 'soft filter' setting? It gives a less 'rectangular' IF filter shape and rounds off the shoulders of the slope, rather like an analogue filter would do. I use this and I find it much kinder on the ear than the default setting.

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