Search found 140 matches

by ON5HB
Sun Jan 13, 2019 4:38 pm
Forum: New Users' experiences
Topic: Sdruno Error
Replies: 3
Views: 1952

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: 4439

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: 2108

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: 8134

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: 6800

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" may not work wi...
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: 6800

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_...
by ON5HB
Mon Jan 07, 2019 5:35 pm
Forum: SDRplay related
Topic: RSP1A Longwave sensitivity
Replies: 45
Views: 11186

Re: RSP1A Longwave sensitivity

Hi Roger, I agree with you, but an SDR receiver is a different puppy then a normal (old) receiver. There is no need to feed it with high-levels, in fact when you do strange things may happen. I did a test with the RSP1A on a G5RV and setting the band to 1-4 MHz in rate, all stations at 1 MHz worked ...
by ON5HB
Mon Jan 07, 2019 5:18 pm
Forum: New Users' experiences
Topic: Using a receiver next to a high-power Ham station...
Replies: 0
Views: 1404

Using a receiver next to a high-power Ham station...

Hi there, I want to tell you how to protect your receiver from blowing to pieces. I used to use 5 to 6 RTL-SDR dongles on a 160M Inverted-L antenna, this antenna is located at an angle of 180 degrees to my G5RV transmission antenna and the minimal distance is about 2 meters. When I'm transmitting I ...
by ON5HB
Sat Jan 05, 2019 4:00 pm
Forum: SDRplay related
Topic: RSP1A Longwave sensitivity
Replies: 45
Views: 11186

Re: RSP1A Longwave sensitivity

You should not have those high sensitivity numbers on de low HF/VLF bands as it will overload your receiver. Most HF/VLF receivers have less sensitivity below 40m band as signals can be very strong and often are. To reach those numbers you need to turn Pre-Amp on with the Icom7300, but if you do the...
by ON5HB
Fri Jan 04, 2019 1:33 pm
Forum: Code Corner
Topic: a rtl_tcp compatible IQ server for the RSP
Replies: 7
Views: 6800

Re: a rtl_tcp compatible IQ server for the RSP

I'm using your server to connect websdr.org with the RSP1A. However, I can send larger sample rates. I have been adding code to your "driver" and compiled it, it does respond but I doubt I have it right. The part I added, but I doubt I have done it correctly: static int set_sample_rate(uint32_t sr) ...