g1hbe wrote:They do if you get the right ferrite. I'm a low frequency enthusiast and I feed my Wellbrook 1530 loop to the High-z input via a homemade balun made from a ferrite binocular core of 'mix N30', RS part no 212-0617. This couples really well down to a few KHz (virtually lossless down as far as 20 KHz which is where the Wellbrook packs up).
Ordinary 43 mix ferrites don't work well at LF though.
Thanks for the info, I've never tried that mix, looking at the spec it certainly does go there doesn't it, I wonder how you find the rolloff as you go up in frequency? The spec seems to indicate it starts rolling at around 500KHz, two frequencies I sort of monitor are 0.135.700 and 0.472.500 and 160m.
Having the RSP1A as a second device allowed me to revisit openwebrx
last night. Openwebrx's interface with rtl_sdr does not pass any antenna parameters (actually, looking at the source code, rtl_sdr doesn't support antenna switching) so in my previous trials with the RSP2 it defaulted to antenna A. Having the single antenna input on the RSP1A suits it better for HF.
*many thanks* to the tireless coders at SDRPlay for their Soapy support and keeping it updated.
It's running on a Raspberry Pi 3 here at the moment, I've restricted it to a low sampling rate to keep the Pi happy, here it is on 40m:
I won't leave my router open for more than today/tonight as I prefer to access my stuff remotely via a backyard VPN and I've restricted it to 4 users. Anyway the timing is bad, our 40m band is absolutely dead at the moment. Hope the Pi stays up, I've got to go out and kill weeds for the rest of the day.
The openwebrx author uses a browser detector to ensure you use the Chrome browser, but it also works in Brave (great browser) and Safari if you change browser IDs, it also works in Chrome on an iPad.
For anyone who manages to get my link to work (I only just set the DNS record), the web GUI is best used like this:
- if the waterfall isn't visible, click the button once, or fine-tune the waterfall sliders.
- click the mouse near a signal of interest in the waterfall, as per most software
- then hover over the waterfall and use the mouse wheel to zoom in (and out) and drag the yellow marker to the precise frequency
- drag the waterfall sideways to see all the band while zoomed in
- drag the left edge of the yellow marker to change RX audio bandwidth, either edge in AM