Search found 195 matches

by g1hbe
Wed Apr 12, 2017 8:18 am
Forum: General
Topic: what can it be this huge interference.... ??
Replies: 7
Views: 1168

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: 1
Views: 691

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: 675

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: 874

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: 6565

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: 515

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.
by g1hbe
Tue Mar 07, 2017 11:31 am
Forum: SDRuno
Topic: Tuning
Replies: 3
Views: 906

Re: Tuning

Dougg - perhaps I'm misunderstanding you, but you do know you can tune in increments of 1Hz if you want? Just hover your mouse over the required digit and roll your mouse wheel.
by g1hbe
Sun Mar 05, 2017 9:05 pm
Forum: SDR Antennas
Topic: Wellbrook loop resistance?
Replies: 2
Views: 945

Re: Wellbrook loop resistance?

The inner of the BNC should definitely be positive 12v. Resistance-wise I get 1.4 Mohm, but the reading probably varies depending on what voltage your meter runs from. Looks like your friend's interface unit has had some reverse polarity!
by g1hbe
Thu Mar 02, 2017 8:50 pm
Forum: SDRuno
Topic: SDRUno recording settings?
Replies: 9
Views: 1458

Re: SDRUno recording settings?

Hi Steve. I can't answer your recording question, but the LO and the 'tuned' frequency should not be the same as this will put the received signal right on top of the local oscillator, which causes noise and distortion especially on weak signals. The received sig should always be off to one side of ...
by g1hbe
Thu Mar 02, 2017 1:05 pm
Forum: SDR Antennas
Topic: High Z with G5RV
Replies: 7
Views: 2118

Re: High Z with G5RV

No problem. 450 ohm into 1k is regarded as a good match, as it's only a 2:1 ratio. On receive it makes little difference anyway. Happy twiddling!

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