Hi! If I tune my Airspy Mini (via spyserver) hooked to an external ham vhf/uhf antenna I find a lot of images of WFM band in the 30-33 Mhz range. Also in 48 and in 10 meters ham. I am alone? There is a way to eliminates it? Ciao Roberto ===== SDR## 1921 Windows 11 running in Parallels Desktop MacBook pro M1Max Airspy+ HF Discovery (on line) Airspy R2 (on line) Airspy Mini (0n line) Spyserver: rob-casa-ge (dot) ddns (dot) info:5555 Airspy+ HF Discovery rob-casa-ge (dot) ddns (dot) info:5556 Airspy Mini QTH Genova Italy nbrc.mynetgear (dot) com:5555 Airspy R2 QTH Breuil Cervinia (Aosta Valley) Italy

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Hi! Not a major issue as I only really noticed this before I calibrated my Mini (plugged into a GPSDO via an attenuator). Running at 6MSPS I see spurs spaced every 24MHz apart across the whole frequency range of the Mini. There are much smaller ones (9dB above noise floor) spaced 12MHz in between. The stronger spurs are typically 30-40dB above noise floor with the gain set to 16. The firmware version is the latest offered for the Mini and the spurs are present on a Pi and 2 different PCs with/without an antenna. Just wondering if these spurs are stronger than usual on my device. Thanks in advance! -- Graeme

Hello, Some of you may find this of interest Project H Line 3D' is a collection of documents and programs designed to be a beginners guide to antenna fabrication, reception, recording, software processing, and graphic display of the 21 cm Hydrogen line. The project makes use of an RTL-SDR and LNA as the radio front end. The Hydrogen Line is an observable increase in RF power at 1420.MHz that is created by natural hydrogen atoms. The Hydrogen line is most easily detected by pointing a directional antenna toward the Milky Way where neutral hydrogen is abundant. Properties of the hydrogen line curve such as its shape and Doppler shift can be used to measure the shape and properties of our Galaxy. Project H Line is designed to be inexpensive and easy for students to build an antenna and set up for drift scans which involve pointing the antenna towards the sky and letting the Earth's rotation drift the Milky Way into and through the view of the antenna. The project includes a design for a 13-element circular patch feed Yagi that can be built using common materials available from a hardware store .. The 13-element Yagi results in about 15dBi gain and a 30-degree 3dB bandwidth. The software portion of the instructions uses the AirSpy SDR# Studio + Kaminski IF_Average plugin to record log files every few minutes. The *.txt files are then converted by an included Java IF_Avg2CSV program by Jamison Adcock into a logarithmic dB scale and a format compatible with Rinearn 2D and 3D graphics packages. Hydrogen 21cm emission line RF from the Milky Way Galaxy Doppler Shifted from the high 10-100 Km/Sec velocities of the galactic arms This is a 24 hour data acquisition using a 'Drift Scan' technique ( fixed antenna position & let the Earth's rotation 'move the sky' ) 5 minutes per saved file. Best Regards, Alex Pettit Project HLine3D

Hi Group, Sorry about reposting this, but I still haven't received any assistance. ‐-------------------- Looking for someone who has Spyserver set up and running. I got Spyserver set up on a Raspberry Pi 5, and am listening on a MS-Surface on my local network. I'm very pleased with this setup, but there are a few things I can't understand. 1. The widest filter setting I can get for Wide FM is 156,250 Hz. I read somewhere that the ideal filter setting for quick RDS decodes is 192,000 Hz, though 200,000 Hz would be nice. I tried entering 200,000 in SDR# v.1920, but the highest it seems to allow is 156,250. I also changed the maximum filter width in Spyserver.config to 200,000 and still only get 156,250 in SDR#. Did I leave something out? Is there another way to do this, or is this a limitation I have to live with? 2. I'm happy I can run my Airspy R2 at 8 MHz bandwidth without any stuttering. I can't say that about any of the other SDR servers I have tried here. My problem appears when I make IQ recordings. This afternoon I was listening to 90.0 MHz in the FM broadcast band. 4 MHz bandwidth displayed on the spectrum/waterfall. I made 5 minute IQ recording, centered on 90.0. When I play back the file with the Baseband File Player only one signal is displayed across the spectrum/waterfall. The frequency cannot be changed. And, the tuned frequency is shown as 89 MHz, not 90 MHz, the frequency I was tuned and the frequency the display was centered on while recording . To add to the confusion, there is no station on 89.0 MHz. Should I not expect to be able to make IQ recordings of more than one station at a time, considering the SDR# client can display several megahertz at a time on the spectrum/waterfall? If the client can make IQ recordings of only one Broadcast FM station at a time then the recording ought to be centered on the frequency I was tuned to, no? Thanks for any assistance. Ken VE3HLS So Phisai, Thailand OK18sc

I've set up Spyserver with an HF+ on both a Pi4 and Windows10 and notice somewhere around 400 Hz of frequency error on SDR# when tuned into WWV on 15MHz. I tried setting a frequency compensation in Spyserver's config file but when checking WWV on 25MHz it's off, sorry I can't say exactly at this point. Any reason this might be happening? The HF+ is dead on when I have it connection by USB. Thanks1