Search found 195 matches

by g1hbe
Thu Jun 29, 2017 7:13 pm
Forum: SDRplay related
Topic: RSP2 LO 3rd harmonic spurious response only -20dBC
Replies: 17
Views: 1043

Re: RSP2 LO 3rd harmonic spurious response only -20dBC

I think I've seen this documented somewhere. There are responses based on odd harmonics of the sampling frequency/LO. Just like the 'image' response on a conventional superhet receiver, there is no way to get rid of them without using front-end filtering. The RSP's have filters, but the lowest one c...
by g1hbe
Thu Jun 29, 2017 11:47 am
Forum: General
Topic: SDRConsole and SDRplay
Replies: 5
Views: 683

Re: SDRConsole and SDRplay

Ah. The error at VHF seems to be about 50 KHz, but at low frequencies it is 5 KHz. This suggests an error in the reference oscillator, but it's a much bigger error than we normally see, and probably way beyond the calibration adjustment. I'm assuming you've tried a different program such as SDRUno o...
by g1hbe
Wed Jun 28, 2017 9:14 pm
Forum: General
Topic: SDRConsole and SDRplay
Replies: 5
Views: 683

Re: SDRConsole and SDRplay

Is the frequency offset always the same, regardless of the frequency you enter (ie LF or VHF)? Or does the offset get worse the higher the frequency?
by g1hbe
Mon Jun 26, 2017 3:35 pm
Forum: SDR Antennas
Topic: Long Wire Antenna Performance Questions
Replies: 7
Views: 803

Re: Long Wire Antenna Performance Questions

Ultravista - As Danube said, the two connections input connections on the balun form a 'differential' input. If you put the same signal on each end, they will cancel and there will be no output. Obviously a pair of wires twisted together are picking up the same signal so they should not be connected...
by g1hbe
Fri Jun 23, 2017 8:19 am
Forum: General
Topic: "Near Field" definition?
Replies: 1
Views: 290

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: 817

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: 488

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: 3
Views: 784

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: 444

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: 533

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...

Go to advanced search