Search found 65 matches

by DK7OB
Sat Dec 23, 2017 10:31 am
Forum: General
Topic: RSP1A: wobbling spurs around 2.335MHz * n
Replies: 17
Views: 6669

Re: RSP1A: wobbling spurs around 2.335MHz * n

Just for laughs I show my Hammy Hambone solution for the spur in the 40m band. It's a 47 Ohms 1206 SMD resistor connected to 5V and glued to the offending chip. The ~0.5 W dissipation creates enough heat to move the spur down to 6.92 MHz. Merry Christmas and a happy new year! 2017-12-23_14-06-20_v1....
by DK7OB
Wed Dec 20, 2017 8:00 am
Forum: Code Corner
Topic: Thread for gr-osmosdr and GNURadio problems/ideas
Replies: 5
Views: 3104

Re: Thread for gr-osmosdr and GNURadio problems/ideas

I am running gqrx with RSP1(A) via the soapy drivers without problems. I was playing with gnuradio some time ago and I also used the soapy via gr-osmosdr without problems. I can check this next week after Christmas when I have some spare time. I found the direct sdrplay support in my gr-osmosdr buil...
by DK7OB
Tue Dec 05, 2017 8:06 am
Forum: General
Topic: RSP1A: wobbling spurs around 2.335MHz * n
Replies: 17
Views: 6669

Re: RSP1A: wobbling spurs around 2.335MHz * n

Just tried your websdr on my smart phone (since I'm at work and company firewall blocks non standard ports) and it worked fine. Heard a EA7 station on 40m SSB. Nice!
by DK7OB
Mon Dec 04, 2017 6:41 am
Forum: General
Topic: RSP1A: wobbling spurs around 2.335MHz * n
Replies: 17
Views: 6669

Re: RSP1A: wobbling spurs around 2.335MHz * n

The switches have a shut down mode, but unfortunately the number 1 chip is always in the signal path, also in the HF band (I traced a 1 MHz signal), so that does not help. I found the spur less prominent when I set front end gain to maximum and IF gain to minimum, but can't say how this influences l...
by DK7OB
Sun Dec 03, 2017 1:48 pm
Forum: General
Topic: RSP1A: wobbling spurs around 2.335MHz * n
Replies: 17
Views: 6669

Re: RSP1A: wobbling spurs around 2.335MHz * n

I opened my new RSP1A and treated components with cold spray. I identified the circled components as the probable culprits for the 3 spurs (frequency of spur jumps up when component cooled) with number 1 being the worst (about 10dB stronger than the others and fundamental > 30dB above noise floor) a...
by DK7OB
Fri Dec 01, 2017 7:38 pm
Forum: General
Topic: RSP1A: wobbling spurs around 2.335MHz * n
Replies: 17
Views: 6669

RSP1A: wobbling spurs around 2.335MHz * n

I am a lucky RSP1 user but now wanted to try the RSP1A. I swapped the RSP1 with the RSP1A in my installation. The RSP1A seemed to work fine. But I detected a wobbly (unstable) spur in the 7MHz amateur band which is not present with the RSP1. Tuning through the HF band, I found the fundamental freque...
by DK7OB
Mon Nov 27, 2017 8:37 am
Forum: General
Topic: the band is packed like sardines
Replies: 1
Views: 920

Re: the band is packed like sardines

Not only the BC band was packed. This is the how the CW part of 20m band looked last weekend:
Screenshot_20171126_134609.jpg
Screenshot_20171126_134609.jpg (150.01 KiB) Viewed 865 times
by DK7OB
Wed Nov 15, 2017 1:12 pm
Forum: General
Topic: GQRX crash, OSX, RSP2 and SoapySDR
Replies: 3
Views: 1738

Re: GQRX crash, OSX, RSP2 and SoapySDR

Yes it's a soapysdrplay or gr-osmosdr problem (Don't remember exactlly which one). It raises an exception if a function is not supported (instead of simply returning an error). I fixed it some time ago on my local build and thought it is now fixed upstream. Do you get this crash if you disable the i...
by DK7OB
Wed Jun 21, 2017 11:38 am
Forum: SDRuno
Topic: SDRuno - Rig Syncronization
Replies: 7
Views: 4814

Re: SDRuno - Rig Syncronization

This is a problem I encountered in my home made synchronization solution under Linux too. If there are modes that exist only on one of the rigs, there is a mapping needed in both directions. Unfortunately this mapping is not always 1:1, but can be 1:N. In my implementation I have some "heuristi...
by DK7OB
Tue Jun 06, 2017 7:49 am
Forum: SDRplay related
Topic: Ubuntu 16.04 current soapysdr and built sdrplay module fail.
Replies: 5
Views: 3029

Re: Ubuntu 16.04 current soapysdr and built sdrplay module fail.

GQRX isn't working, but I think I just have to build gr-osmosdr with the non-free switch to get there. This is not required if you are using the soapysdr bacckend in gromosdr. But I think you need quite recent grosmosdr and soapysdrplay for working with API 2.x and RSP2. (I have an RSP1 so I can't ...

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