Search found 171 matches

by g1hbe
Fri Jun 23, 2017 8:19 am
Forum: General
Topic: "Near Field" definition?
Replies: 1
Views: 93

Re: "Near Field" definition?

Hi. My RSP2 is fed from a Wellbrook loop (or sometimes a random wire) only a few metres from my 160m vertical (it's for the 160m band, not 160m tall!) and I've not had any problems. I use fairly modest power levels though, never more than 35 watts PEP. One thing as amazed me - if I keep the power do...
by g1hbe
Sat Jun 17, 2017 11:59 pm
Forum: SDR Antennas
Topic: Longwire antenna question
Replies: 7
Views: 335

Re: Longwire antenna question

Are you selecting the Hi-z input? You have to click on the Hi-z button. Other than that I can't think of much. The RSP is very sensitive on all bands.
by g1hbe
Wed Jun 14, 2017 10:33 am
Forum: General
Topic: RSP1 susceptibility to a DC voltage on its input?
Replies: 3
Views: 232

Re: RSP1 susceptibility to a DC voltage on its input?

Just to play devil's advocate! I'd be wary of building any bias-T without a DC blocking cap on the receiver side. It may be OK for the RSP1, but if you get into the habit of using a DC-coupled bias-T you may absent-mindedly attach it to something that is NOT AC coupled and then you'd be in trouble. ...
by g1hbe
Tue Jun 13, 2017 2:39 pm
Forum: General
Topic: RSP-1 or RSP-2?
Replies: 2
Views: 309

Re: RSP-1 or RSP-2?

I agree with Mike. The 2 uses the same receiver chips as the 1 so it has the same basic performance, but the added flexibility of the three antenna inputs and the better controllability of the front-end gain make it better in use. Then there is the bias-T on one input which gets rid of the extra box...
by g1hbe
Mon Jun 05, 2017 6:24 am
Forum: SDRuno
Topic: Liking SDRUno
Replies: 2
Views: 256

Re: Liking SDRUno

Paul I use the Hi-z input for all my LF, MF and HF operation and it has a very good response right down to a few kHz, much better than the two SMA inputs. In fact SDRPlay recommend the Hi-z input for these bands. I'm not sure of the response above 30 MHz but the SMA inputs work well from 30 MHz to U...
by g1hbe
Wed May 31, 2017 7:43 am
Forum: SDRuno
Topic: Channel Skew Adjustment Procedure
Replies: 4
Views: 299

Re: Channel Skew Adjustment Procedure

I must admit I haven't seen the 1,2,3 settings, and I'm away from home now so I can't check. Optimum balance does seem to change with frequency, so perhaps they are pre sets as you suggest. I've found the auto setting works well enough. Your noise level seems high (or your signals low). Is everythin...
by g1hbe
Fri May 26, 2017 3:50 pm
Forum: SDRuno
Topic: Channel Skew Adjustment Procedure
Replies: 4
Views: 299

Re: Channel Skew Adjustment Procedure

I've found the best way to adjust I/Q balance is to tune in a very strong signal and position it on one side of the waterfall display. Look in the same position on the other side of the display for a mirror image. If you can't see one, then you probably don't need to adjust anything! If you do see o...
by g1hbe
Fri May 26, 2017 2:50 pm
Forum: General
Topic: Sdr-console V3 Preview is out
Replies: 11
Views: 4470

Re: Sdr-console V3 Preview is out

Please forgive me if I'm misunderstanding you, but why would you want to place a frequency (the one you want to listen to presumably?) at centre? With the SRP units (and any other 'zero IF' SDR) that's where the central DC spike is and should be avoided.
by g1hbe
Fri May 26, 2017 10:55 am
Forum: SDR Antennas
Topic: Great experience with PAR Electronics EF-SWL
Replies: 7
Views: 1497

Re: Great experience with PAR Electronics EF-SWL

That's very interesting, Heinrich. My experience is just the opposite! On wire antennas and 'mini-whip' types I get terrible noise, especially at MF and LF, but the loop is much quieter and allows signals to be heard. As you say, it depends on what types of QRM you suffer from and how close it origi...
by g1hbe
Thu May 25, 2017 6:19 pm
Forum: SDR Antennas
Topic: Great experience with PAR Electronics EF-SWL
Replies: 7
Views: 1497

Re: Great experience with PAR Electronics EF-SWL

Hi Captain. Wire antennas are cheap and you can design or tune them across wide ranges, but I'd question their use with the high noise levels we have these days. I've been using a Wellbrook loop for the last 16 years or so and it's worth its weight in gold. Banishes noise almost completely, especial...

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