Technical Topics > SDR - Software Defined Radio

SDR issue with new antenna (RSP2)

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Elf36:
So I finally put up a decent antenna dedicated to my RSP2 on HF. It is a 9:1 balun with 70' of main line and about 25' of counterpoise. So before I was just using an MLA-30 and I was so excited to compare the 2 antennas. I'm sure the new longer antenna will pull in weaker signals, but the noise it brought was bad too. It seemed like most all of the time frequencies 5000/10000/15000 etc were coming in clearer with the MLA-30. The signal may have been larger on the wire, but the MLA-30 was actually more clear? It seemed similar when I hooked up my 135' OCF dipole. I first had it hooked up to the second ANT port (Non bias T) then I even tried making a jumper for the HI-Z port with wire and a SO239. The HIGH-Z connection is supposed to be optimized for HF, but it seemed to make matters worse? Maybe its settings in SDRuno that I need to change or learn to adjust? I was pretty deflated with my results. Any advice would be greatly appreciated.

Elf36:
Just got home and have messed around with the High-Z side, hooking up earth ground etc. No luck. Currently going back and forth between the MLA-30 and my 135' OCF dipole. The MLA-30 seems to work just as good as 135' of wire up high? I'm at a loss

The MLA-30 is hooked to port B with the Bias-T amplifier and the OCF is on Port A

I also noticed when I was tuned to one of the time stations 10.000/15.000, the OCF was picking up something completely different. Spanish music? I hooked up a NooElec AM broadcast filter, even though I'm certain there are no AM broadcast transmitters anywhere near me. Did seem to help get rid of the music though?

~SIGINT~:
Here are my settings in the image below if it helps. No issues with my unit and and it has been running for several years now and I live in the middle of RF city. I primarily use a Barker & Williamson antenna (T2FD) in an inverted-V configuration followed by an end-fed longwire, a Wellbrook loop and a mini-whip. All 4 antennae exhibit different receive characteristics. After installing the loop I had to add a Flamingo AM filter as the loop was too sensitive and would overload the SDR's input. I now also have a Flamingo FM filter in-line notching out both broadcast bands. All 4 antennae are connected to an external coax switch and to the A input on the SDR. My B input is used for ADS-B, VHF and UHF.

Elf36:
Thanks for the reply. I really hope I get it worked out. I was really looking forward to doing more listening. Especially Utility type stuff. I've turned knobs for many years and enjoyed it, but I also realize that I could hear much more being able to see more spectrum at a time. I live in a fairly rural area and don't have a lot of high tech devices in my house etc. I just thought I'd be blown away by my new large wire antenna. I typically use my HF rig for listening for the most part. I'll keep plugging along, but I just don't get it?

Josh:
On the bigger antenna, might have to reduce gain in the sdr to make sure you don't max out the adc. With so much surplus gain designed in most in modern sdr you can stand to add some decimation as well as gain reduction, both will increase dynamic range.

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