Search found 132 matches

by DaveB
Fri Apr 29, 2016 10:28 am
Forum: SDRplay related
Topic: Using SDRPlay as RFI Finder
Replies: 5
Views: 2530

Re: Using SDRPlay as RFI Finder

My SDRPlay is excellent at showing up RFI. Some days at 0845 a dirty great RF source starts up at the lower end of the FM broadcast band - adding 25-30dB to the noise floor. It lasts about 45 minutes. It suggest to me an RF heating source when a factory starts up in the morning. Currently every even...
by DaveB
Sun Apr 17, 2016 4:25 pm
Forum: SDRplay related
Topic: Minimum gain but still have images
Replies: 7
Views: 3419

Re: Minimum gain but still have images

BTW and FWIW, I find that using Low IF with HDSDR greatly improves managing those images. Hi Harry, The problem with using Low IF is that you then have to contend with IF images spaced at twice the sample rate i.e. 4.096 MHz below a strong station - and these are only around 45 dB down. Airspy will...
by DaveB
Wed Apr 13, 2016 10:26 pm
Forum: SDRplay related
Topic: Minimum gain but still have images
Replies: 7
Views: 3419

Re: Minimum gain but still have images

By "AM station" you mean a medium wave broadcast station I presume. Your description suggests an aliasing problem which is why it is moving at x3 the frequency shift. I had the reverse problem - Radio China International on the 75 m band appearing at the bottom end of the AM band and movin...
by DaveB
Sat Apr 02, 2016 11:49 am
Forum: SDRplay related
Topic: Introduction to Panadapters with SDR
Replies: 1
Views: 1257

Re: Introduction to Panadapters with SDR

Another source of information and adapter kits for a number of popular transceivers is g4hup.com. I purchased a PAT50M to fit to my Lowe HF225 receiver as I wanted to take advantage of the front end band-pass filters to improve image rejection on HF. It worked very well. It was easiest to use it wit...
by DaveB
Fri Apr 01, 2016 9:45 pm
Forum: SDRplay related
Topic: ADC Setpoint not working
Replies: 4
Views: 2301

Re: ADC Setpoint not working

I only know the Windows platform - but what Mirics API are you using? When API 1.8.0 was released the interaction between the LNA gain and the tuner gain was changed and caused a 20 dB jump in overall gain at the changeover point. This was corrected in a few days later in API 1.8.1. Is it possible t...
by DaveB
Thu Mar 31, 2016 8:38 pm
Forum: General
Topic: Sdr-console V3 Preview is out
Replies: 12
Views: 6789

Re: Sdr-console V3 Preview is out

I've downloaded it to a Windows 8.1 machine and tried it on SDRPLay only. I look forward to further releases with keen interest especially when RDS decoding is incorporated. I'm sure the test team are busy scrutinising it to the nth degree to weed out the bugs etc. I wonder if Simon will get the RDS...
by DaveB
Thu Mar 31, 2016 9:53 am
Forum: General
Topic: Suggested 6M and VHF gain settings?
Replies: 1
Views: 1321

Re: Suggested 6M and VHF gain settings?

Possibly the simplest way is to run with LNA and then set AGC on. Then see what figure the IF gain ends up at. It obviously depends on what stations are about. For the FM broadcast band somewhere between - 45 and - 65 is 'normal'.
by DaveB
Thu Mar 31, 2016 6:21 am
Forum: SDRplay related
Topic: ADC Setpoint not working
Replies: 4
Views: 2301

ADC Setpoint not working

I don't normally move the setpoint from -20dB but in the past doing so had an effect on the noise floor and if set to 0 dB or just under could end up with overload. I was chasing down a varying noise floor (possible local off frequency transmitter?) and found that with the current version changing t...
by DaveB
Mon Mar 14, 2016 5:39 pm
Forum: General
Topic: SDRPlay simple modifictions
Replies: 3
Views: 2809

Re: SDRPlay simple modifictions

Did the shielding make a difference? I just wrapped my MkI in a couple of layers of aluminium kitchen foil. A cable tie ensured it was grounded to the antenna. It basically eliminated the 'hash' from the background when listening on an adjacent analogue FM tuner - and removed lots of spikes on the ...
by DaveB
Fri Feb 19, 2016 11:37 pm
Forum: General
Topic: SDRPlay, HDSDR, Ham Radio Deluxe, IF Out?
Replies: 1
Views: 2028

Re: SDRPlay, HDSDR, Ham Radio Deluxe, IF Out?

In HDSDR under "Options" (F7) click on the menu item "RF Front End and Calibration". The left hand section deals with SDR hardware coupling. I've added an IF output for my Lowe HF-225 which gives a 45 MHz signal - so I set it to "Manually" controlled and "Independe...

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