Search found 124 matches

by ON5HB
Tue Jan 15, 2019 3:17 pm
Forum: General
Topic: Transmit-receive switches
Replies: 1
Views: 1154

Re: Transmit-receive switches

If it's just a 7300 and using it's own antenna, why not connect a NoElec upconverter between them? It will give extra protection. The switch, I ordered the B version only helps if you want to use the same RX/TX antenna. If your TX antenna is a few meters away and the output is just 100W, nothing wil...
by ON5HB
Sun Jan 13, 2019 10:27 pm
Forum: SDR Antennas
Topic: Mains noise
Replies: 13
Views: 10647

Re: Mains noise

The first solution everybody should do is a common-mode-choke. In short this is preventing that the outside of the coax/cable works like an antenna. Most easy and cheap way to remove this is a big plastic bottle and wind coax around it, 20 turns or so and the effect is gone. Naturally you do this at...
by ON5HB
Sun Jan 13, 2019 4:52 pm
Forum: SDRplay related
Topic: THIS THREAD EXPLAINS WHY IT IS SO DIFFICULT TO UNDERSTAND RECEIVER'S SENSITIVITY IN LF & RELATED MATTERS
Replies: 28
Views: 6903

Re: THIS THREAD EXPLAINS WHY IT IS SO DIFFICULT TO UNDERSTAND RECEIVER'S SENSITIVITY IN LF & RELATED MATTERS

Hi Glovisol, Well I use the RSP1A's just for people that have no receivers themselves or no place to put antenna's, so they can run my receivers remote. My own transceiver is an Icom 7300 that covers 0-72MHz with better numbers :D Do not get me wrong, I love these RSP's but I use them for other peop...
by ON5HB
Sun Jan 13, 2019 4:38 pm
Forum: New Users' experiences
Topic: Sdruno Error
Replies: 3
Views: 1686

Re: Sdruno Error

How long is your cable?
As typical these are printer cables of about 1.5m or more.

I myself ordered cables of 25cm.

You are dealing with just 5v voltage, that gives problems over small distances if the cables have thin wires in them.
Try a very short cable, will probably solve all problems.
by ON5HB
Sun Jan 13, 2019 4:31 pm
Forum: SDR Antennas
Topic: Loop antenna for SDR question
Replies: 5
Views: 4051

Re: Loop antenna for SDR question

Trough some wire over a few trees, for HF that will work a lot better. It's not even critical and you van go around corners if you want. You will be amazed how easy it is to make an HF wire antenna, typical just a long piece of wire and that 2 times, both in opposite directions. Make it as long as y...
by ON5HB
Sun Jan 13, 2019 4:23 pm
Forum: General
Topic: SDRplay Receiver access via EtherNet LAN ?
Replies: 4
Views: 1825

Re: SDRplay Receiver access via EtherNet LAN ?

Question 1: Why use USB? Question 2: Why not use coax to bring the signal to the receiver? I'm doing that, works great. Sorry to say, but I fail to see the need to extend USB via CAT5 when it can be done with coax. If you use a common-mode-choke at the end of the coax at the antenna connection it wi...
by ON5HB
Sun Jan 13, 2019 3:00 pm
Forum: SDRplay related
Topic: THIS THREAD EXPLAINS WHY IT IS SO DIFFICULT TO UNDERSTAND RECEIVER'S SENSITIVITY IN LF & RELATED MATTERS
Replies: 28
Views: 6903

Re: THIS THREAD EXPLAINS WHY IT IS SO DIFFICULT TO UNDERSTAND RECEIVER'S SENSITIVITY IN LF & RELATED MATTERS

Hi there, I had this problem too in the past, the main issue is the low frequency and major signals close together. That is where mixing starts, the I/Q can't be separated well, it simply can't work out a good signal from a bad one. Baluns and other stuff do not help, tried everything including orde...
by ON5HB
Fri Jan 11, 2019 1:09 pm
Forum: Code Corner
Topic: a rtl_tcp compatible IQ server for the RSP
Replies: 7
Views: 6124

Re: a rtl_tcp compatible IQ server for the RSP

Has been fixed. I forked the F4FHH source to create good drivers for websdr.org systems. Turned out to my own problem the CPU overloaded, my kernel params used for dongles where a problem for SDRplay :lol: The "driver" can be found here: https://github.com/ON5HB Beware, this "driver&q...
by ON5HB
Wed Jan 09, 2019 7:01 pm
Forum: Code Corner
Topic: a rtl_tcp compatible IQ server for the RSP
Replies: 7
Views: 6124

Re: a rtl_tcp compatible IQ server for the RSP

I figured it out, the key is decimate factor. This should be the correct settings to emulate a dongle on a slow CPU: if (sr >= 8000000) { deci = 1; bwType = mir_sdr_BW_8_000; } else if (sr >= 6000000) { deci = 1; bwType = mir_sdr_BW_6_000; } else if (sr >= 3200000) { deci = 1; bwType = mir_sdr_BW_5_...

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