Search found 329 matches

by g1hbe
Wed Jan 18, 2017 11:07 pm
Forum: SDRplay related
Topic: RSP2 front-end protection?
Replies: 7
Views: 5126

Re: RSP2 front-end protection?

Hi Ian The internal screening of the RSP2's plastic box is continuous as far as I know and forms a closed screen around the circuit board. It is grounded to the 0v of the electronics. I doubt the 'pro' version is any better. As for protection, I think it uses the usual back-to-back diodes and accord...
by g1hbe
Wed Jan 18, 2017 11:23 am
Forum: SDR Antennas
Topic: RA0SMS Miniwhip bad performance on SDRPlay
Replies: 35
Views: 20769

Re: RA0SMS Miniwhip bad performance on SDRPlay

My experience with mini-whip type antennas has not been good, but that's because this area has a high noise level. This type of antenna is very good for its small size and excellent performance at LF, but it is wide open to local electrical noise. In contrast, my Wellbrook loop reduces the noise fro...
by g1hbe
Fri Jan 13, 2017 5:14 pm
Forum: General
Topic: RSP2 Upgraders - What Do You Find Better than RSP1?
Replies: 6
Views: 3322

Re: RSP2 Upgraders - What Do You Find Better than RSP1?

Hi Noel, you might like to take a look at this. Although there is a mis-match between a 50 ohm antenna system and the 1k Hi-z input, it works just fine and gives better results than the SMA inputs.

http://www.sdrplay.com/guide-to-using-t ... -the-rsp2/
by g1hbe
Fri Jan 13, 2017 3:56 pm
Forum: General
Topic: RSP2 Upgraders - What Do You Find Better than RSP1?
Replies: 6
Views: 3322

Re: RSP2 Upgraders - What Do You Find Better than RSP1?

I agree with everything I3DKA has said. The three selectable antenna inputs are very useful as it saves mucking about with external switches or diplexers. The Hi-z input produces a lower noise floor than the two SMA inputs on LF/MF/HF and as it rolls off above 30 MHz the annoying FM sproggies are go...
by g1hbe
Wed Jan 11, 2017 5:14 pm
Forum: General
Topic: Notch Filter and antenna ports for RSP2
Replies: 2
Views: 2010

Re: Notch Filter and antenna ports for RSP2

The AM notch is designed to stop images from the AM(MW) band popping up in higher bands like SW and VHF. You would use antennas A or B for listening on VHF, so that's where the notch filter is fitted. You wouldn't want to notch the AM band when listening to the AM band via the Hi-z port. I find the ...
by g1hbe
Sat Jan 07, 2017 7:01 pm
Forum: New Users' experiences
Topic: Frequency in SDRUno and hardware drift apart
Replies: 4
Views: 3123

Re: Frequency in SDRUno and hardware drift apart

Hi Mark. I can honestly say I've never encountered anything like this with either RSP1 or 2. Have you contacted support?
by g1hbe
Sat Jan 07, 2017 4:28 pm
Forum: SDR Antennas
Topic: Beverage or Wellbrook Loop?
Replies: 8
Views: 6398

Re: Beverage or Wellbrook Loop?

Wow, a 300 meter Beverage! That would be a magnificent beast. I live in a small home in the UK so something like that could never be anything more than a dream, so I obviously cannot comment. However, the Wellbrook is something I've been using for about 15 years. The 1530 (originally bought in about...
by g1hbe
Fri Jan 06, 2017 5:23 pm
Forum: SDRuno
Topic: Initial Frequency On Startup Distorted
Replies: 7
Views: 3732

Re: Initial Frequency On Startup Distorted

Hi Noel I'm not sure of the inner workings, but I'm guessing there is a hardware limitation of the Mirics chipset which limits the choices of sampling freqs in LOW IF mode. I generally use ZERO IF as it allows a greater choice, but like you I often use a span of no more than a MHz or two. I've also ...
by g1hbe
Fri Jan 06, 2017 12:10 pm
Forum: SDRuno
Topic: Initial Frequency On Startup Distorted
Replies: 7
Views: 3732

Re: Initial Frequency On Startup Distorted

Yes of course Danube, I was thinking of soundcard SDR's. Actually I've found that WFM is not unduly disturbed by the spike as long as the incoming signal is not too weak. AM modes are hit badly.
by g1hbe
Thu Jan 05, 2017 11:07 pm
Forum: SDRuno
Topic: Initial Frequency On Startup Distorted
Replies: 7
Views: 3732

Re: Initial Frequency On Startup Distorted

It's normal. It's the famous 'DC spike' and is seen in all SDR's to a certain extent. I agree it would be preferable if SDRUno started with the tuned frequency slightly away from the spike, but it doesn't. Adjustment of the front-end gain can help reduce it, but it will always be there to a certain ...

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