Search found 28 matches

by DF1KZ
Thu Oct 12, 2017 2:18 pm
Forum: New Users' experiences
Topic: PC (laptop) power induces significant noise
Replies: 16
Views: 10948

Re: PC (laptop) power induces significant noise

Hello Adrian, For me this transformer looks like a transformer for your doorbell. It is rather unusual to use this kind of transformers for LEDs. Transformers for doorbells often are simple transformers without any active component, they don't produce noise on the power lines. You should look for a ...
by DF1KZ
Wed Oct 11, 2017 5:28 pm
Forum: New Users' experiences
Topic: PC (laptop) power induces significant noise
Replies: 16
Views: 10948

Re: PC (laptop) power induces significant noise

Hello Adrian, The problem you all have is nothing new - it is called EMC. Many devices especially those cheap ones coming from Asia do not fulfil the requirements of the EMC-directive (Europe) or FCC (USA). They produce to much noise on the power-lines, the power-lines radiate this noise and you hea...
by DF1KZ
Mon Oct 02, 2017 4:49 pm
Forum: SDRplay related
Topic: Blew up antenna port A on my new RSP2. :(
Replies: 4
Views: 2488

Re: Blew up antenna port A on my new RSP2. :(

imho there are decoupling capacitors used for the inputs of RSP1/2. They are situated in front of the limiting diodes BAV99W of Port A and Port B so the diodes will not be destroyed by DC (but maybe by to much HF). The HiZ-Input does not seem to have capacitors in front of the diodes, they are conne...
by DF1KZ
Mon Oct 02, 2017 4:29 pm
Forum: SDR Antennas
Topic: Antenna's
Replies: 4
Views: 3399

Re: Antenna's

Hello, I use the RSP2pro with a Diskone on Port B and an active antenna (DX10) on Port HiZ and Port A. For HiZ I use a homebrew transformer 6:26 wdg on a BN73-202 binocular core. Port A of the RSP2pro and the input of the transformer are connected to the DX10 (behind the Bias-T) by a simple resistiv...
by DF1KZ
Sat Sep 30, 2017 3:20 pm
Forum: SDRplay related
Topic: Blew up antenna port A on my new RSP2. :(
Replies: 4
Views: 2488

Re: Blew up antenna port A on my new RSP2. :(

Hello Jimbo,

imho the devices you mention are diodes like BAV99 (A7). They work as limiters.
If port B and HiZ is still working I would try to remove this diodes and make a test whether reception is possible.
The IC labelled 251 is a antenna switch. Hopefully you didn't blow that.

Wolfgang
by DF1KZ
Sun Sep 24, 2017 2:47 pm
Forum: SDRuno
Topic: SDRuno freezes
Replies: 7
Views: 3679

Re: SDRuno freezes

I have the same problem as wolfdd using "HDSDR with RSP2" rev. 2.76 . Sometimes when I switch between antenna "High Z" and antenna "A" using ExtIO HDSDR freezes. I have to stop and start again then everything works fine. Seems to be a little bug in the antenna-switching...
by DF1KZ
Sun Jul 23, 2017 7:27 am
Forum: SDRplay related
Topic: RSP2 LO 3rd harmonic spurious response only -20dBC
Replies: 17
Views: 8568

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

Hello Andy

Give a BN 73-202 a try. For me it works down to 10 kHz as a matching transformer for the HiZ-input of the RSP2.

73, Wolfgang (DF1KZ)
by DF1KZ
Sun Jul 23, 2017 7:22 am
Forum: SDRplay related
Topic: Reference IN & OUT - Which plugs fit
Replies: 2
Views: 1511

Re: Reference IN & OUT - Which plugs fit

You can buy inexpensive adapters to BNC at several Chinese online-stores. They work very well.

Wolfgang (DF1KZ)
by DF1KZ
Sun Jul 23, 2017 7:14 am
Forum: SDRplay related
Topic: Couple of RSP2 Newbie Questions...
Replies: 4
Views: 2748

Re: Couple of RSP2 Newbie Questions...

Hello Everyone, It is very simple to build a transformer for the HiZ-input of the RSP2. Just use a binocular core BN 73-202 (1€) with 3 turns primary and 13 turns secondary. You can also try 2 turns/9turns that may be better on higher frequencies. It takes 10 minutes to wind the transformer. Using t...
by DF1KZ
Sun Dec 25, 2016 11:33 am
Forum: SDRplay related
Topic: Using the RSP1 with a noise source aka Scalar Network Analyzer
Replies: 8
Views: 13540

Re: Using the RSP1 with a noise source aka Scalar Network Analyzer

I use this Noise Source, a RSP1 and a Mini Circuits ZEDC-15-2B coupler. The noise source is really good, it becomes even better if you remove the third amplifier and insert a few dB attenuation between source and coupler. The reason for the high temperature of the source are the resistors used with ...

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